Low-mass Quiescent Galaxies Are Small in Isolated Environments: Environmental Dependence of the Mass–Size Relation of Low-mass Quiescent Galaxies

We study the mass–size relation of quiescent galaxies across various environments, with a particular focus on its environmental dependence at the low-mass part of $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\lesssim 10.0$ . Our sample consists of 13,667 quiescent galaxies with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\geqslant 9.4$ and 0.01 < z < 0.04 from the Sloan Digital Sky Survey. We discover that the mass–size relation of low-mass quiescent galaxies (LQGs) with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\lesssim 10.0$ depends on their environment, with LQGs in the highest-density environments exhibiting an average size ∼70% larger than those in isolated environments. Moreover, the slope of the mass–size relation for LQGs in high-density environments is significantly shallower than that of their counterparts in isolated environments. This is in contrast with high-mass quiescent galaxies with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\gtrsim 10.5$ that show a nearly identical mass–size relation across all environments. Combined with additional discoveries that the mass–size relation slopes of LQGs and star-forming galaxies are similar to each other in high-density environments, and that LQGs in higher-density environments exhibit more disk-like structures, our results support the idea that LQGs in high-density environments have evolved from star-forming galaxies through environmental effects, which are capable of causing their quenching and transformation into quiescent galaxies. With the aid of an analysis of merger rates for simulated galaxies from a cosmological galaxy formation simulation, we suggest that the steep slope and low normalization of the mass–size relation of LQGs in the lowest-density environments may originate from recent gas-rich mergers, which occur over 10–30 times more frequently in the progenitors of LQGs in the lowest-density environments than in their counterparts in high-density environments at low redshifts. Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Yongmin Yoon [verfasserIn] Jae-Woo Kim [verfasserIn] Jongwan Ko [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2023

Schlagwörter:	Early-type galaxies Galaxy environments Galaxy evolution Galaxy formation Galaxy structure Quenched galaxies

Übergeordnetes Werk:	In: The Astrophysical Journal - IOP Publishing, 2022, 957(2023), 2, p 59
Übergeordnetes Werk:	volume:957 ; year:2023 ; number:2, p 59

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3847/1538-4357/acfed5

Katalog-ID:	DOAJ091974186

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allfields	10.3847/1538-4357/acfed5 doi (DE-627)DOAJ091974186 (DE-599)DOAJ495e6b8ee6bd4a49b3f1edebabf5bd40 DE-627 ger DE-627 rakwb eng QB460-466 Yongmin Yoon verfasserin aut Low-mass Quiescent Galaxies Are Small in Isolated Environments: Environmental Dependence of the Mass–Size Relation of Low-mass Quiescent Galaxies 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We study the mass–size relation of quiescent galaxies across various environments, with a particular focus on its environmental dependence at the low-mass part of $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\lesssim 10.0$ . Our sample consists of 13,667 quiescent galaxies with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\geqslant 9.4$ and 0.01 < z < 0.04 from the Sloan Digital Sky Survey. We discover that the mass–size relation of low-mass quiescent galaxies (LQGs) with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\lesssim 10.0$ depends on their environment, with LQGs in the highest-density environments exhibiting an average size ∼70% larger than those in isolated environments. Moreover, the slope of the mass–size relation for LQGs in high-density environments is significantly shallower than that of their counterparts in isolated environments. This is in contrast with high-mass quiescent galaxies with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\gtrsim 10.5$ that show a nearly identical mass–size relation across all environments. Combined with additional discoveries that the mass–size relation slopes of LQGs and star-forming galaxies are similar to each other in high-density environments, and that LQGs in higher-density environments exhibit more disk-like structures, our results support the idea that LQGs in high-density environments have evolved from star-forming galaxies through environmental effects, which are capable of causing their quenching and transformation into quiescent galaxies. With the aid of an analysis of merger rates for simulated galaxies from a cosmological galaxy formation simulation, we suggest that the steep slope and low normalization of the mass–size relation of LQGs in the lowest-density environments may originate from recent gas-rich mergers, which occur over 10–30 times more frequently in the progenitors of LQGs in the lowest-density environments than in their counterparts in high-density environments at low redshifts. Early-type galaxies Galaxy environments Galaxy evolution Galaxy formation Galaxy structure Quenched galaxies Astrophysics Jae-Woo Kim verfasserin aut Jongwan Ko verfasserin aut In The Astrophysical Journal IOP Publishing, 2022 957(2023), 2, p 59 (DE-627)269019219 (DE-600)1473835-1 15384357 nnns volume:957 year:2023 number:2, p 59 https://doi.org/10.3847/1538-4357/acfed5 kostenfrei https://doaj.org/article/495e6b8ee6bd4a49b3f1edebabf5bd40 kostenfrei https://doi.org/10.3847/1538-4357/acfed5 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 957 2023 2, p 59
spelling	10.3847/1538-4357/acfed5 doi (DE-627)DOAJ091974186 (DE-599)DOAJ495e6b8ee6bd4a49b3f1edebabf5bd40 DE-627 ger DE-627 rakwb eng QB460-466 Yongmin Yoon verfasserin aut Low-mass Quiescent Galaxies Are Small in Isolated Environments: Environmental Dependence of the Mass–Size Relation of Low-mass Quiescent Galaxies 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We study the mass–size relation of quiescent galaxies across various environments, with a particular focus on its environmental dependence at the low-mass part of $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\lesssim 10.0$ . Our sample consists of 13,667 quiescent galaxies with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\geqslant 9.4$ and 0.01 < z < 0.04 from the Sloan Digital Sky Survey. We discover that the mass–size relation of low-mass quiescent galaxies (LQGs) with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\lesssim 10.0$ depends on their environment, with LQGs in the highest-density environments exhibiting an average size ∼70% larger than those in isolated environments. Moreover, the slope of the mass–size relation for LQGs in high-density environments is significantly shallower than that of their counterparts in isolated environments. This is in contrast with high-mass quiescent galaxies with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\gtrsim 10.5$ that show a nearly identical mass–size relation across all environments. Combined with additional discoveries that the mass–size relation slopes of LQGs and star-forming galaxies are similar to each other in high-density environments, and that LQGs in higher-density environments exhibit more disk-like structures, our results support the idea that LQGs in high-density environments have evolved from star-forming galaxies through environmental effects, which are capable of causing their quenching and transformation into quiescent galaxies. With the aid of an analysis of merger rates for simulated galaxies from a cosmological galaxy formation simulation, we suggest that the steep slope and low normalization of the mass–size relation of LQGs in the lowest-density environments may originate from recent gas-rich mergers, which occur over 10–30 times more frequently in the progenitors of LQGs in the lowest-density environments than in their counterparts in high-density environments at low redshifts. Early-type galaxies Galaxy environments Galaxy evolution Galaxy formation Galaxy structure Quenched galaxies Astrophysics Jae-Woo Kim verfasserin aut Jongwan Ko verfasserin aut In The Astrophysical Journal IOP Publishing, 2022 957(2023), 2, p 59 (DE-627)269019219 (DE-600)1473835-1 15384357 nnns volume:957 year:2023 number:2, p 59 https://doi.org/10.3847/1538-4357/acfed5 kostenfrei https://doaj.org/article/495e6b8ee6bd4a49b3f1edebabf5bd40 kostenfrei https://doi.org/10.3847/1538-4357/acfed5 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 957 2023 2, p 59
allfields_unstemmed	10.3847/1538-4357/acfed5 doi (DE-627)DOAJ091974186 (DE-599)DOAJ495e6b8ee6bd4a49b3f1edebabf5bd40 DE-627 ger DE-627 rakwb eng QB460-466 Yongmin Yoon verfasserin aut Low-mass Quiescent Galaxies Are Small in Isolated Environments: Environmental Dependence of the Mass–Size Relation of Low-mass Quiescent Galaxies 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We study the mass–size relation of quiescent galaxies across various environments, with a particular focus on its environmental dependence at the low-mass part of $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\lesssim 10.0$ . Our sample consists of 13,667 quiescent galaxies with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\geqslant 9.4$ and 0.01 < z < 0.04 from the Sloan Digital Sky Survey. We discover that the mass–size relation of low-mass quiescent galaxies (LQGs) with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\lesssim 10.0$ depends on their environment, with LQGs in the highest-density environments exhibiting an average size ∼70% larger than those in isolated environments. Moreover, the slope of the mass–size relation for LQGs in high-density environments is significantly shallower than that of their counterparts in isolated environments. This is in contrast with high-mass quiescent galaxies with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\gtrsim 10.5$ that show a nearly identical mass–size relation across all environments. Combined with additional discoveries that the mass–size relation slopes of LQGs and star-forming galaxies are similar to each other in high-density environments, and that LQGs in higher-density environments exhibit more disk-like structures, our results support the idea that LQGs in high-density environments have evolved from star-forming galaxies through environmental effects, which are capable of causing their quenching and transformation into quiescent galaxies. With the aid of an analysis of merger rates for simulated galaxies from a cosmological galaxy formation simulation, we suggest that the steep slope and low normalization of the mass–size relation of LQGs in the lowest-density environments may originate from recent gas-rich mergers, which occur over 10–30 times more frequently in the progenitors of LQGs in the lowest-density environments than in their counterparts in high-density environments at low redshifts. Early-type galaxies Galaxy environments Galaxy evolution Galaxy formation Galaxy structure Quenched galaxies Astrophysics Jae-Woo Kim verfasserin aut Jongwan Ko verfasserin aut In The Astrophysical Journal IOP Publishing, 2022 957(2023), 2, p 59 (DE-627)269019219 (DE-600)1473835-1 15384357 nnns volume:957 year:2023 number:2, p 59 https://doi.org/10.3847/1538-4357/acfed5 kostenfrei https://doaj.org/article/495e6b8ee6bd4a49b3f1edebabf5bd40 kostenfrei https://doi.org/10.3847/1538-4357/acfed5 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 957 2023 2, p 59
allfieldsGer	10.3847/1538-4357/acfed5 doi (DE-627)DOAJ091974186 (DE-599)DOAJ495e6b8ee6bd4a49b3f1edebabf5bd40 DE-627 ger DE-627 rakwb eng QB460-466 Yongmin Yoon verfasserin aut Low-mass Quiescent Galaxies Are Small in Isolated Environments: Environmental Dependence of the Mass–Size Relation of Low-mass Quiescent Galaxies 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We study the mass–size relation of quiescent galaxies across various environments, with a particular focus on its environmental dependence at the low-mass part of $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\lesssim 10.0$ . Our sample consists of 13,667 quiescent galaxies with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\geqslant 9.4$ and 0.01 < z < 0.04 from the Sloan Digital Sky Survey. We discover that the mass–size relation of low-mass quiescent galaxies (LQGs) with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\lesssim 10.0$ depends on their environment, with LQGs in the highest-density environments exhibiting an average size ∼70% larger than those in isolated environments. Moreover, the slope of the mass–size relation for LQGs in high-density environments is significantly shallower than that of their counterparts in isolated environments. This is in contrast with high-mass quiescent galaxies with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\gtrsim 10.5$ that show a nearly identical mass–size relation across all environments. Combined with additional discoveries that the mass–size relation slopes of LQGs and star-forming galaxies are similar to each other in high-density environments, and that LQGs in higher-density environments exhibit more disk-like structures, our results support the idea that LQGs in high-density environments have evolved from star-forming galaxies through environmental effects, which are capable of causing their quenching and transformation into quiescent galaxies. With the aid of an analysis of merger rates for simulated galaxies from a cosmological galaxy formation simulation, we suggest that the steep slope and low normalization of the mass–size relation of LQGs in the lowest-density environments may originate from recent gas-rich mergers, which occur over 10–30 times more frequently in the progenitors of LQGs in the lowest-density environments than in their counterparts in high-density environments at low redshifts. Early-type galaxies Galaxy environments Galaxy evolution Galaxy formation Galaxy structure Quenched galaxies Astrophysics Jae-Woo Kim verfasserin aut Jongwan Ko verfasserin aut In The Astrophysical Journal IOP Publishing, 2022 957(2023), 2, p 59 (DE-627)269019219 (DE-600)1473835-1 15384357 nnns volume:957 year:2023 number:2, p 59 https://doi.org/10.3847/1538-4357/acfed5 kostenfrei https://doaj.org/article/495e6b8ee6bd4a49b3f1edebabf5bd40 kostenfrei https://doi.org/10.3847/1538-4357/acfed5 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 957 2023 2, p 59
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source	In The Astrophysical Journal 957(2023), 2, p 59 volume:957 year:2023 number:2, p 59
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topic	misc QB460-466 misc Early-type galaxies misc Galaxy environments misc Galaxy evolution misc Galaxy formation misc Galaxy structure misc Quenched galaxies misc Astrophysics
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title	Low-mass Quiescent Galaxies Are Small in Isolated Environments: Environmental Dependence of the Mass–Size Relation of Low-mass Quiescent Galaxies
ctrlnum	(DE-627)DOAJ091974186 (DE-599)DOAJ495e6b8ee6bd4a49b3f1edebabf5bd40
title_full	Low-mass Quiescent Galaxies Are Small in Isolated Environments: Environmental Dependence of the Mass–Size Relation of Low-mass Quiescent Galaxies
author_sort	Yongmin Yoon
journal	The Astrophysical Journal
journalStr	The Astrophysical Journal
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author_browse	Yongmin Yoon Jae-Woo Kim Jongwan Ko
container_volume	957
class	QB460-466
format_se	Elektronische Aufsätze
author-letter	Yongmin Yoon
doi_str_mv	10.3847/1538-4357/acfed5
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title_sort	low-mass quiescent galaxies are small in isolated environments: environmental dependence of the mass–size relation of low-mass quiescent galaxies
callnumber	QB460-466
title_auth	Low-mass Quiescent Galaxies Are Small in Isolated Environments: Environmental Dependence of the Mass–Size Relation of Low-mass Quiescent Galaxies
abstract	We study the mass–size relation of quiescent galaxies across various environments, with a particular focus on its environmental dependence at the low-mass part of $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\lesssim 10.0$ . Our sample consists of 13,667 quiescent galaxies with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\geqslant 9.4$ and 0.01 < z < 0.04 from the Sloan Digital Sky Survey. We discover that the mass–size relation of low-mass quiescent galaxies (LQGs) with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\lesssim 10.0$ depends on their environment, with LQGs in the highest-density environments exhibiting an average size ∼70% larger than those in isolated environments. Moreover, the slope of the mass–size relation for LQGs in high-density environments is significantly shallower than that of their counterparts in isolated environments. This is in contrast with high-mass quiescent galaxies with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\gtrsim 10.5$ that show a nearly identical mass–size relation across all environments. Combined with additional discoveries that the mass–size relation slopes of LQGs and star-forming galaxies are similar to each other in high-density environments, and that LQGs in higher-density environments exhibit more disk-like structures, our results support the idea that LQGs in high-density environments have evolved from star-forming galaxies through environmental effects, which are capable of causing their quenching and transformation into quiescent galaxies. With the aid of an analysis of merger rates for simulated galaxies from a cosmological galaxy formation simulation, we suggest that the steep slope and low normalization of the mass–size relation of LQGs in the lowest-density environments may originate from recent gas-rich mergers, which occur over 10–30 times more frequently in the progenitors of LQGs in the lowest-density environments than in their counterparts in high-density environments at low redshifts.
abstractGer	We study the mass–size relation of quiescent galaxies across various environments, with a particular focus on its environmental dependence at the low-mass part of $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\lesssim 10.0$ . Our sample consists of 13,667 quiescent galaxies with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\geqslant 9.4$ and 0.01 < z < 0.04 from the Sloan Digital Sky Survey. We discover that the mass–size relation of low-mass quiescent galaxies (LQGs) with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\lesssim 10.0$ depends on their environment, with LQGs in the highest-density environments exhibiting an average size ∼70% larger than those in isolated environments. Moreover, the slope of the mass–size relation for LQGs in high-density environments is significantly shallower than that of their counterparts in isolated environments. This is in contrast with high-mass quiescent galaxies with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\gtrsim 10.5$ that show a nearly identical mass–size relation across all environments. Combined with additional discoveries that the mass–size relation slopes of LQGs and star-forming galaxies are similar to each other in high-density environments, and that LQGs in higher-density environments exhibit more disk-like structures, our results support the idea that LQGs in high-density environments have evolved from star-forming galaxies through environmental effects, which are capable of causing their quenching and transformation into quiescent galaxies. With the aid of an analysis of merger rates for simulated galaxies from a cosmological galaxy formation simulation, we suggest that the steep slope and low normalization of the mass–size relation of LQGs in the lowest-density environments may originate from recent gas-rich mergers, which occur over 10–30 times more frequently in the progenitors of LQGs in the lowest-density environments than in their counterparts in high-density environments at low redshifts.
abstract_unstemmed	We study the mass–size relation of quiescent galaxies across various environments, with a particular focus on its environmental dependence at the low-mass part of $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\lesssim 10.0$ . Our sample consists of 13,667 quiescent galaxies with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\geqslant 9.4$ and 0.01 < z < 0.04 from the Sloan Digital Sky Survey. We discover that the mass–size relation of low-mass quiescent galaxies (LQGs) with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\lesssim 10.0$ depends on their environment, with LQGs in the highest-density environments exhibiting an average size ∼70% larger than those in isolated environments. Moreover, the slope of the mass–size relation for LQGs in high-density environments is significantly shallower than that of their counterparts in isolated environments. This is in contrast with high-mass quiescent galaxies with $\mathrm{log}({M}_{\mathrm{star}}/{M}_{\odot })\gtrsim 10.5$ that show a nearly identical mass–size relation across all environments. Combined with additional discoveries that the mass–size relation slopes of LQGs and star-forming galaxies are similar to each other in high-density environments, and that LQGs in higher-density environments exhibit more disk-like structures, our results support the idea that LQGs in high-density environments have evolved from star-forming galaxies through environmental effects, which are capable of causing their quenching and transformation into quiescent galaxies. With the aid of an analysis of merger rates for simulated galaxies from a cosmological galaxy formation simulation, we suggest that the steep slope and low normalization of the mass–size relation of LQGs in the lowest-density environments may originate from recent gas-rich mergers, which occur over 10–30 times more frequently in the progenitors of LQGs in the lowest-density environments than in their counterparts in high-density environments at low redshifts.
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container_issue	2, p 59
title_short	Low-mass Quiescent Galaxies Are Small in Isolated Environments: Environmental Dependence of the Mass–Size Relation of Low-mass Quiescent Galaxies
url	https://doi.org/10.3847/1538-4357/acfed5 https://doaj.org/article/495e6b8ee6bd4a49b3f1edebabf5bd40 https://doaj.org/toc/1538-4357
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up_date	2024-07-03T23:20:03.300Z
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Low-mass Quiescent Galaxies Are Small in Isolated Environments: Environmental Dependence of the Mass–Size Relation of Low-mass Quiescent Galaxies

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