A Massive Quiescent Galaxy in a Group Environment at z = 4.53

We report on the spectroscopic confirmation of a massive quiescent galaxy at z _spec = 4.53 in the COSMOS field. The object was first identified as a galaxy with suppressed star formation at z _phot ∼ 4.65 from the COSMOS2020 catalog. The follow-up spectroscopy with Keck/MOSFIRE in the K band reveal...
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Autor*in:	Takumi Kakimoto [verfasserIn] Masayuki Tanaka [verfasserIn] Masato Onodera [verfasserIn] Rhythm Shimakawa [verfasserIn] Po-Feng Wu [verfasserIn] Katriona M. L. Gould [verfasserIn] Kei Ito [verfasserIn] Shuowen Jin [verfasserIn] Mariko Kubo [verfasserIn] Tomoko L. Suzuki [verfasserIn] Sune Toft [verfasserIn] Francesco Valentino [verfasserIn] Kiyoto Yabe [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2024

Schlagwörter:	Galaxy evolution High-redshift galaxies Galaxy quenching Quenched galaxies Galaxy groups Galaxy environments

Übergeordnetes Werk:	In: The Astrophysical Journal - IOP Publishing, 2022, 963(2024), 1, p 49
Übergeordnetes Werk:	volume:963 ; year:2024 ; number:1, p 49

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3847/1538-4357/ad1ff1

Katalog-ID:	DOAJ091673062

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allfields	10.3847/1538-4357/ad1ff1 doi (DE-627)DOAJ091673062 (DE-599)DOAJ7893d9c0a26a44e89833f223b29a30e9 DE-627 ger DE-627 rakwb eng QB460-466 Takumi Kakimoto verfasserin aut A Massive Quiescent Galaxy in a Group Environment at z = 4.53 2024 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We report on the spectroscopic confirmation of a massive quiescent galaxy at z _spec = 4.53 in the COSMOS field. The object was first identified as a galaxy with suppressed star formation at z _phot ∼ 4.65 from the COSMOS2020 catalog. The follow-up spectroscopy with Keck/MOSFIRE in the K band reveals faint [O ii ] emission and the Balmer break, indicative of evolved stellar populations. We fit the spectral energy distribution using photometry and a spectrum to infer physical properties. The obtained stellar mass is high ( M _* ∼ 10 ^10.8 M _⊙ ) and the current star formation rate is more than 1 dex below that of main-sequence galaxies at z = 4.5. Its star formation history suggests that this galaxy experienced rapid quenching from z ∼ 5. The galaxy is among the youngest quiescent galaxies confirmed so far at z _spec < 3 with z _form ∼ 5.2 (200 Myr ago), which is the epoch when 50% of the total stellar mass was formed. A unique aspect of the galaxy is that it is in an extremely dense region; there are four massive star-forming galaxies at 4.4 < z _phot < 4.7 located within 150 physical kpc from the galaxy. Interestingly, three of them have virial radii that strongly overlap with that of the central quiescent galaxy (∼70 kpc), suggesting that the overdensity region is likely the highest-redshift candidate of a dense group with a spectroscopically confirmed quiescent galaxy at the center. The group provides us with a unique opportunity to gain insights into the role of the group environment in quenching at z ∼ 5, which corresponds to the formation epoch of massive elliptical galaxies in the local Universe. Galaxy evolution High-redshift galaxies Galaxy quenching Quenched galaxies Galaxy groups Galaxy environments Astrophysics Masayuki Tanaka verfasserin aut Masato Onodera verfasserin aut Rhythm Shimakawa verfasserin aut Po-Feng Wu verfasserin aut Katriona M. L. Gould verfasserin aut Kei Ito verfasserin aut Shuowen Jin verfasserin aut Mariko Kubo verfasserin aut Tomoko L. Suzuki verfasserin aut Sune Toft verfasserin aut Francesco Valentino verfasserin aut Kiyoto Yabe verfasserin aut In The Astrophysical Journal IOP Publishing, 2022 963(2024), 1, p 49 (DE-627)269019219 (DE-600)1473835-1 15384357 nnns volume:963 year:2024 number:1, p 49 https://doi.org/10.3847/1538-4357/ad1ff1 kostenfrei https://doaj.org/article/7893d9c0a26a44e89833f223b29a30e9 kostenfrei https://doi.org/10.3847/1538-4357/ad1ff1 kostenfrei https://doaj.org/toc/1538-4357 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2014 GBV_ILN_2088 GBV_ILN_2522 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 963 2024 1, p 49
spelling	10.3847/1538-4357/ad1ff1 doi (DE-627)DOAJ091673062 (DE-599)DOAJ7893d9c0a26a44e89833f223b29a30e9 DE-627 ger DE-627 rakwb eng QB460-466 Takumi Kakimoto verfasserin aut A Massive Quiescent Galaxy in a Group Environment at z = 4.53 2024 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We report on the spectroscopic confirmation of a massive quiescent galaxy at z _spec = 4.53 in the COSMOS field. The object was first identified as a galaxy with suppressed star formation at z _phot ∼ 4.65 from the COSMOS2020 catalog. The follow-up spectroscopy with Keck/MOSFIRE in the K band reveals faint [O ii ] emission and the Balmer break, indicative of evolved stellar populations. We fit the spectral energy distribution using photometry and a spectrum to infer physical properties. The obtained stellar mass is high ( M _* ∼ 10 ^10.8 M _⊙ ) and the current star formation rate is more than 1 dex below that of main-sequence galaxies at z = 4.5. Its star formation history suggests that this galaxy experienced rapid quenching from z ∼ 5. The galaxy is among the youngest quiescent galaxies confirmed so far at z _spec < 3 with z _form ∼ 5.2 (200 Myr ago), which is the epoch when 50% of the total stellar mass was formed. A unique aspect of the galaxy is that it is in an extremely dense region; there are four massive star-forming galaxies at 4.4 < z _phot < 4.7 located within 150 physical kpc from the galaxy. Interestingly, three of them have virial radii that strongly overlap with that of the central quiescent galaxy (∼70 kpc), suggesting that the overdensity region is likely the highest-redshift candidate of a dense group with a spectroscopically confirmed quiescent galaxy at the center. The group provides us with a unique opportunity to gain insights into the role of the group environment in quenching at z ∼ 5, which corresponds to the formation epoch of massive elliptical galaxies in the local Universe. Galaxy evolution High-redshift galaxies Galaxy quenching Quenched galaxies Galaxy groups Galaxy environments Astrophysics Masayuki Tanaka verfasserin aut Masato Onodera verfasserin aut Rhythm Shimakawa verfasserin aut Po-Feng Wu verfasserin aut Katriona M. L. Gould verfasserin aut Kei Ito verfasserin aut Shuowen Jin verfasserin aut Mariko Kubo verfasserin aut Tomoko L. Suzuki verfasserin aut Sune Toft verfasserin aut Francesco Valentino verfasserin aut Kiyoto Yabe verfasserin aut In The Astrophysical Journal IOP Publishing, 2022 963(2024), 1, p 49 (DE-627)269019219 (DE-600)1473835-1 15384357 nnns volume:963 year:2024 number:1, p 49 https://doi.org/10.3847/1538-4357/ad1ff1 kostenfrei https://doaj.org/article/7893d9c0a26a44e89833f223b29a30e9 kostenfrei https://doi.org/10.3847/1538-4357/ad1ff1 kostenfrei https://doaj.org/toc/1538-4357 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2014 GBV_ILN_2088 GBV_ILN_2522 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 963 2024 1, p 49
allfields_unstemmed	10.3847/1538-4357/ad1ff1 doi (DE-627)DOAJ091673062 (DE-599)DOAJ7893d9c0a26a44e89833f223b29a30e9 DE-627 ger DE-627 rakwb eng QB460-466 Takumi Kakimoto verfasserin aut A Massive Quiescent Galaxy in a Group Environment at z = 4.53 2024 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We report on the spectroscopic confirmation of a massive quiescent galaxy at z _spec = 4.53 in the COSMOS field. The object was first identified as a galaxy with suppressed star formation at z _phot ∼ 4.65 from the COSMOS2020 catalog. The follow-up spectroscopy with Keck/MOSFIRE in the K band reveals faint [O ii ] emission and the Balmer break, indicative of evolved stellar populations. We fit the spectral energy distribution using photometry and a spectrum to infer physical properties. The obtained stellar mass is high ( M _* ∼ 10 ^10.8 M _⊙ ) and the current star formation rate is more than 1 dex below that of main-sequence galaxies at z = 4.5. Its star formation history suggests that this galaxy experienced rapid quenching from z ∼ 5. The galaxy is among the youngest quiescent galaxies confirmed so far at z _spec < 3 with z _form ∼ 5.2 (200 Myr ago), which is the epoch when 50% of the total stellar mass was formed. A unique aspect of the galaxy is that it is in an extremely dense region; there are four massive star-forming galaxies at 4.4 < z _phot < 4.7 located within 150 physical kpc from the galaxy. Interestingly, three of them have virial radii that strongly overlap with that of the central quiescent galaxy (∼70 kpc), suggesting that the overdensity region is likely the highest-redshift candidate of a dense group with a spectroscopically confirmed quiescent galaxy at the center. The group provides us with a unique opportunity to gain insights into the role of the group environment in quenching at z ∼ 5, which corresponds to the formation epoch of massive elliptical galaxies in the local Universe. Galaxy evolution High-redshift galaxies Galaxy quenching Quenched galaxies Galaxy groups Galaxy environments Astrophysics Masayuki Tanaka verfasserin aut Masato Onodera verfasserin aut Rhythm Shimakawa verfasserin aut Po-Feng Wu verfasserin aut Katriona M. L. Gould verfasserin aut Kei Ito verfasserin aut Shuowen Jin verfasserin aut Mariko Kubo verfasserin aut Tomoko L. Suzuki verfasserin aut Sune Toft verfasserin aut Francesco Valentino verfasserin aut Kiyoto Yabe verfasserin aut In The Astrophysical Journal IOP Publishing, 2022 963(2024), 1, p 49 (DE-627)269019219 (DE-600)1473835-1 15384357 nnns volume:963 year:2024 number:1, p 49 https://doi.org/10.3847/1538-4357/ad1ff1 kostenfrei https://doaj.org/article/7893d9c0a26a44e89833f223b29a30e9 kostenfrei https://doi.org/10.3847/1538-4357/ad1ff1 kostenfrei https://doaj.org/toc/1538-4357 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2014 GBV_ILN_2088 GBV_ILN_2522 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 963 2024 1, p 49
allfieldsGer	10.3847/1538-4357/ad1ff1 doi (DE-627)DOAJ091673062 (DE-599)DOAJ7893d9c0a26a44e89833f223b29a30e9 DE-627 ger DE-627 rakwb eng QB460-466 Takumi Kakimoto verfasserin aut A Massive Quiescent Galaxy in a Group Environment at z = 4.53 2024 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We report on the spectroscopic confirmation of a massive quiescent galaxy at z _spec = 4.53 in the COSMOS field. The object was first identified as a galaxy with suppressed star formation at z _phot ∼ 4.65 from the COSMOS2020 catalog. The follow-up spectroscopy with Keck/MOSFIRE in the K band reveals faint [O ii ] emission and the Balmer break, indicative of evolved stellar populations. We fit the spectral energy distribution using photometry and a spectrum to infer physical properties. The obtained stellar mass is high ( M _* ∼ 10 ^10.8 M _⊙ ) and the current star formation rate is more than 1 dex below that of main-sequence galaxies at z = 4.5. Its star formation history suggests that this galaxy experienced rapid quenching from z ∼ 5. The galaxy is among the youngest quiescent galaxies confirmed so far at z _spec < 3 with z _form ∼ 5.2 (200 Myr ago), which is the epoch when 50% of the total stellar mass was formed. A unique aspect of the galaxy is that it is in an extremely dense region; there are four massive star-forming galaxies at 4.4 < z _phot < 4.7 located within 150 physical kpc from the galaxy. Interestingly, three of them have virial radii that strongly overlap with that of the central quiescent galaxy (∼70 kpc), suggesting that the overdensity region is likely the highest-redshift candidate of a dense group with a spectroscopically confirmed quiescent galaxy at the center. The group provides us with a unique opportunity to gain insights into the role of the group environment in quenching at z ∼ 5, which corresponds to the formation epoch of massive elliptical galaxies in the local Universe. Galaxy evolution High-redshift galaxies Galaxy quenching Quenched galaxies Galaxy groups Galaxy environments Astrophysics Masayuki Tanaka verfasserin aut Masato Onodera verfasserin aut Rhythm Shimakawa verfasserin aut Po-Feng Wu verfasserin aut Katriona M. L. Gould verfasserin aut Kei Ito verfasserin aut Shuowen Jin verfasserin aut Mariko Kubo verfasserin aut Tomoko L. Suzuki verfasserin aut Sune Toft verfasserin aut Francesco Valentino verfasserin aut Kiyoto Yabe verfasserin aut In The Astrophysical Journal IOP Publishing, 2022 963(2024), 1, p 49 (DE-627)269019219 (DE-600)1473835-1 15384357 nnns volume:963 year:2024 number:1, p 49 https://doi.org/10.3847/1538-4357/ad1ff1 kostenfrei https://doaj.org/article/7893d9c0a26a44e89833f223b29a30e9 kostenfrei https://doi.org/10.3847/1538-4357/ad1ff1 kostenfrei https://doaj.org/toc/1538-4357 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2014 GBV_ILN_2088 GBV_ILN_2522 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 963 2024 1, p 49
allfieldsSound	10.3847/1538-4357/ad1ff1 doi (DE-627)DOAJ091673062 (DE-599)DOAJ7893d9c0a26a44e89833f223b29a30e9 DE-627 ger DE-627 rakwb eng QB460-466 Takumi Kakimoto verfasserin aut A Massive Quiescent Galaxy in a Group Environment at z = 4.53 2024 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We report on the spectroscopic confirmation of a massive quiescent galaxy at z _spec = 4.53 in the COSMOS field. The object was first identified as a galaxy with suppressed star formation at z _phot ∼ 4.65 from the COSMOS2020 catalog. The follow-up spectroscopy with Keck/MOSFIRE in the K band reveals faint [O ii ] emission and the Balmer break, indicative of evolved stellar populations. We fit the spectral energy distribution using photometry and a spectrum to infer physical properties. The obtained stellar mass is high ( M _* ∼ 10 ^10.8 M _⊙ ) and the current star formation rate is more than 1 dex below that of main-sequence galaxies at z = 4.5. Its star formation history suggests that this galaxy experienced rapid quenching from z ∼ 5. The galaxy is among the youngest quiescent galaxies confirmed so far at z _spec < 3 with z _form ∼ 5.2 (200 Myr ago), which is the epoch when 50% of the total stellar mass was formed. A unique aspect of the galaxy is that it is in an extremely dense region; there are four massive star-forming galaxies at 4.4 < z _phot < 4.7 located within 150 physical kpc from the galaxy. Interestingly, three of them have virial radii that strongly overlap with that of the central quiescent galaxy (∼70 kpc), suggesting that the overdensity region is likely the highest-redshift candidate of a dense group with a spectroscopically confirmed quiescent galaxy at the center. The group provides us with a unique opportunity to gain insights into the role of the group environment in quenching at z ∼ 5, which corresponds to the formation epoch of massive elliptical galaxies in the local Universe. Galaxy evolution High-redshift galaxies Galaxy quenching Quenched galaxies Galaxy groups Galaxy environments Astrophysics Masayuki Tanaka verfasserin aut Masato Onodera verfasserin aut Rhythm Shimakawa verfasserin aut Po-Feng Wu verfasserin aut Katriona M. L. Gould verfasserin aut Kei Ito verfasserin aut Shuowen Jin verfasserin aut Mariko Kubo verfasserin aut Tomoko L. Suzuki verfasserin aut Sune Toft verfasserin aut Francesco Valentino verfasserin aut Kiyoto Yabe verfasserin aut In The Astrophysical Journal IOP Publishing, 2022 963(2024), 1, p 49 (DE-627)269019219 (DE-600)1473835-1 15384357 nnns volume:963 year:2024 number:1, p 49 https://doi.org/10.3847/1538-4357/ad1ff1 kostenfrei https://doaj.org/article/7893d9c0a26a44e89833f223b29a30e9 kostenfrei https://doi.org/10.3847/1538-4357/ad1ff1 kostenfrei https://doaj.org/toc/1538-4357 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2014 GBV_ILN_2088 GBV_ILN_2522 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 963 2024 1, p 49
language	English
source	In The Astrophysical Journal 963(2024), 1, p 49 volume:963 year:2024 number:1, p 49
sourceStr	In The Astrophysical Journal 963(2024), 1, p 49 volume:963 year:2024 number:1, p 49
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	Galaxy evolution High-redshift galaxies Galaxy quenching Quenched galaxies Galaxy groups Galaxy environments Astrophysics
isfreeaccess_bool	true
container_title	The Astrophysical Journal
authorswithroles_txt_mv	Takumi Kakimoto @@aut@@ Masayuki Tanaka @@aut@@ Masato Onodera @@aut@@ Rhythm Shimakawa @@aut@@ Po-Feng Wu @@aut@@ Katriona M. L. Gould @@aut@@ Kei Ito @@aut@@ Shuowen Jin @@aut@@ Mariko Kubo @@aut@@ Tomoko L. Suzuki @@aut@@ Sune Toft @@aut@@ Francesco Valentino @@aut@@ Kiyoto Yabe @@aut@@
publishDateDaySort_date	2024-01-01T00:00:00Z
hierarchy_top_id	269019219
id	DOAJ091673062
language_de	englisch
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callnumber-first	Q - Science
author	Takumi Kakimoto
spellingShingle	Takumi Kakimoto misc QB460-466 misc Galaxy evolution misc High-redshift galaxies misc Galaxy quenching misc Quenched galaxies misc Galaxy groups misc Galaxy environments misc Astrophysics A Massive Quiescent Galaxy in a Group Environment at z = 4.53
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topic_title	QB460-466 A Massive Quiescent Galaxy in a Group Environment at z = 4.53 Galaxy evolution High-redshift galaxies Galaxy quenching Quenched galaxies Galaxy groups Galaxy environments
topic	misc QB460-466 misc Galaxy evolution misc High-redshift galaxies misc Galaxy quenching misc Quenched galaxies misc Galaxy groups misc Galaxy environments misc Astrophysics
topic_unstemmed	misc QB460-466 misc Galaxy evolution misc High-redshift galaxies misc Galaxy quenching misc Quenched galaxies misc Galaxy groups misc Galaxy environments misc Astrophysics
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title	A Massive Quiescent Galaxy in a Group Environment at z = 4.53
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title_full	A Massive Quiescent Galaxy in a Group Environment at z = 4.53
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author_browse	Takumi Kakimoto Masayuki Tanaka Masato Onodera Rhythm Shimakawa Po-Feng Wu Katriona M. L. Gould Kei Ito Shuowen Jin Mariko Kubo Tomoko L. Suzuki Sune Toft Francesco Valentino Kiyoto Yabe
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title_sort	massive quiescent galaxy in a group environment at z = 4.53
callnumber	QB460-466
title_auth	A Massive Quiescent Galaxy in a Group Environment at z = 4.53
abstract	We report on the spectroscopic confirmation of a massive quiescent galaxy at z _spec = 4.53 in the COSMOS field. The object was first identified as a galaxy with suppressed star formation at z _phot ∼ 4.65 from the COSMOS2020 catalog. The follow-up spectroscopy with Keck/MOSFIRE in the K band reveals faint [O ii ] emission and the Balmer break, indicative of evolved stellar populations. We fit the spectral energy distribution using photometry and a spectrum to infer physical properties. The obtained stellar mass is high ( M _* ∼ 10 ^10.8 M _⊙ ) and the current star formation rate is more than 1 dex below that of main-sequence galaxies at z = 4.5. Its star formation history suggests that this galaxy experienced rapid quenching from z ∼ 5. The galaxy is among the youngest quiescent galaxies confirmed so far at z _spec < 3 with z _form ∼ 5.2 (200 Myr ago), which is the epoch when 50% of the total stellar mass was formed. A unique aspect of the galaxy is that it is in an extremely dense region; there are four massive star-forming galaxies at 4.4 < z _phot < 4.7 located within 150 physical kpc from the galaxy. Interestingly, three of them have virial radii that strongly overlap with that of the central quiescent galaxy (∼70 kpc), suggesting that the overdensity region is likely the highest-redshift candidate of a dense group with a spectroscopically confirmed quiescent galaxy at the center. The group provides us with a unique opportunity to gain insights into the role of the group environment in quenching at z ∼ 5, which corresponds to the formation epoch of massive elliptical galaxies in the local Universe.
abstractGer	We report on the spectroscopic confirmation of a massive quiescent galaxy at z _spec = 4.53 in the COSMOS field. The object was first identified as a galaxy with suppressed star formation at z _phot ∼ 4.65 from the COSMOS2020 catalog. The follow-up spectroscopy with Keck/MOSFIRE in the K band reveals faint [O ii ] emission and the Balmer break, indicative of evolved stellar populations. We fit the spectral energy distribution using photometry and a spectrum to infer physical properties. The obtained stellar mass is high ( M _* ∼ 10 ^10.8 M _⊙ ) and the current star formation rate is more than 1 dex below that of main-sequence galaxies at z = 4.5. Its star formation history suggests that this galaxy experienced rapid quenching from z ∼ 5. The galaxy is among the youngest quiescent galaxies confirmed so far at z _spec < 3 with z _form ∼ 5.2 (200 Myr ago), which is the epoch when 50% of the total stellar mass was formed. A unique aspect of the galaxy is that it is in an extremely dense region; there are four massive star-forming galaxies at 4.4 < z _phot < 4.7 located within 150 physical kpc from the galaxy. Interestingly, three of them have virial radii that strongly overlap with that of the central quiescent galaxy (∼70 kpc), suggesting that the overdensity region is likely the highest-redshift candidate of a dense group with a spectroscopically confirmed quiescent galaxy at the center. The group provides us with a unique opportunity to gain insights into the role of the group environment in quenching at z ∼ 5, which corresponds to the formation epoch of massive elliptical galaxies in the local Universe.
abstract_unstemmed	We report on the spectroscopic confirmation of a massive quiescent galaxy at z _spec = 4.53 in the COSMOS field. The object was first identified as a galaxy with suppressed star formation at z _phot ∼ 4.65 from the COSMOS2020 catalog. The follow-up spectroscopy with Keck/MOSFIRE in the K band reveals faint [O ii ] emission and the Balmer break, indicative of evolved stellar populations. We fit the spectral energy distribution using photometry and a spectrum to infer physical properties. The obtained stellar mass is high ( M _* ∼ 10 ^10.8 M _⊙ ) and the current star formation rate is more than 1 dex below that of main-sequence galaxies at z = 4.5. Its star formation history suggests that this galaxy experienced rapid quenching from z ∼ 5. The galaxy is among the youngest quiescent galaxies confirmed so far at z _spec < 3 with z _form ∼ 5.2 (200 Myr ago), which is the epoch when 50% of the total stellar mass was formed. A unique aspect of the galaxy is that it is in an extremely dense region; there are four massive star-forming galaxies at 4.4 < z _phot < 4.7 located within 150 physical kpc from the galaxy. Interestingly, three of them have virial radii that strongly overlap with that of the central quiescent galaxy (∼70 kpc), suggesting that the overdensity region is likely the highest-redshift candidate of a dense group with a spectroscopically confirmed quiescent galaxy at the center. The group provides us with a unique opportunity to gain insights into the role of the group environment in quenching at z ∼ 5, which corresponds to the formation epoch of massive elliptical galaxies in the local Universe.
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title_short	A Massive Quiescent Galaxy in a Group Environment at z = 4.53
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score	7.401454

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A Massive Quiescent Galaxy in a Group Environment at z = 4.53

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