A Full Resolution of the 450 μm Extragalactic Background Light

The extragalactic background light (EBL) is the cumulative radiation outside the Milky Way. The determination of its corresponding primary emitting sources as well as its total energy level across the entire electromagnetic spectrum has profound implications for both cosmology and galaxy formation....
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Autor*in:	Qi-Ning Hsu [verfasserIn] L. L. Cowie [verfasserIn] Chian-Chou Chen [verfasserIn] A. J. Barger [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2024

Schlagwörter:	Submillimeter astronomy Galaxy counts Extragalactic astronomy Cosmic background radiation

Übergeordnetes Werk:	In: The Astrophysical Journal Letters - IOP Publishing, 2022, 964(2024), 2, p L32
Übergeordnetes Werk:	volume:964 ; year:2024 ; number:2, p L32

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3847/2041-8213/ad3421

Katalog-ID:	DOAJ099769115

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520			\|a The extragalactic background light (EBL) is the cumulative radiation outside the Milky Way. The determination of its corresponding primary emitting sources as well as its total energy level across the entire electromagnetic spectrum has profound implications for both cosmology and galaxy formation. However, the detailed origin of the EBL at far-infrared wavelengths, particularly those close to the peak of the cosmic infrared background, remains unclear. Here we report the results of our ongoing SCUBA-2 450 μ m survey of 10 massive galaxy cluster fields. By exploiting the strong gravitational lensing offered by these clusters, we obtain significant counts down to an unprecedented depth of ∼0.1 mJy at this wavelength, about 10 times deeper than that reached by any other previous survey. The cumulative energy density based on the counts is 138.1 ${}_{-19.3}^{+23.9}$ Jy deg ^−2 or 0.45 ${}_{-0.06}^{+0.08}$ MJy sr ^−1 . Comparing our measurements to those made by the COBE and Planck satellites, we find that at this flux density level, the 450 μ m EBL is entirely resolved by our SCUBA-2 observations. Thus, we find for the first time that discrete sources produce fully to the 450 μ m EBL, and that about half of it comes from sources with sub-mJy flux densities. Our deep number counts provide strong constraints on galaxy formation models.
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callnumber-first	Q - Science
author	Qi-Ning Hsu
spellingShingle	Qi-Ning Hsu misc QB460-466 misc Submillimeter astronomy misc Galaxy counts misc Extragalactic astronomy misc Cosmic background radiation misc Astrophysics A Full Resolution of the 450 μm Extragalactic Background Light
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topic_title	QB460-466 A Full Resolution of the 450 μm Extragalactic Background Light Submillimeter astronomy Galaxy counts Extragalactic astronomy Cosmic background radiation
topic	misc QB460-466 misc Submillimeter astronomy misc Galaxy counts misc Extragalactic astronomy misc Cosmic background radiation misc Astrophysics
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title	A Full Resolution of the 450 μm Extragalactic Background Light
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title_sort	full resolution of the 450 μm extragalactic background light
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title_auth	A Full Resolution of the 450 μm Extragalactic Background Light
abstract	The extragalactic background light (EBL) is the cumulative radiation outside the Milky Way. The determination of its corresponding primary emitting sources as well as its total energy level across the entire electromagnetic spectrum has profound implications for both cosmology and galaxy formation. However, the detailed origin of the EBL at far-infrared wavelengths, particularly those close to the peak of the cosmic infrared background, remains unclear. Here we report the results of our ongoing SCUBA-2 450 μ m survey of 10 massive galaxy cluster fields. By exploiting the strong gravitational lensing offered by these clusters, we obtain significant counts down to an unprecedented depth of ∼0.1 mJy at this wavelength, about 10 times deeper than that reached by any other previous survey. The cumulative energy density based on the counts is 138.1 ${}_{-19.3}^{+23.9}$ Jy deg ^−2 or 0.45 ${}_{-0.06}^{+0.08}$ MJy sr ^−1 . Comparing our measurements to those made by the COBE and Planck satellites, we find that at this flux density level, the 450 μ m EBL is entirely resolved by our SCUBA-2 observations. Thus, we find for the first time that discrete sources produce fully to the 450 μ m EBL, and that about half of it comes from sources with sub-mJy flux densities. Our deep number counts provide strong constraints on galaxy formation models.
abstractGer	The extragalactic background light (EBL) is the cumulative radiation outside the Milky Way. The determination of its corresponding primary emitting sources as well as its total energy level across the entire electromagnetic spectrum has profound implications for both cosmology and galaxy formation. However, the detailed origin of the EBL at far-infrared wavelengths, particularly those close to the peak of the cosmic infrared background, remains unclear. Here we report the results of our ongoing SCUBA-2 450 μ m survey of 10 massive galaxy cluster fields. By exploiting the strong gravitational lensing offered by these clusters, we obtain significant counts down to an unprecedented depth of ∼0.1 mJy at this wavelength, about 10 times deeper than that reached by any other previous survey. The cumulative energy density based on the counts is 138.1 ${}_{-19.3}^{+23.9}$ Jy deg ^−2 or 0.45 ${}_{-0.06}^{+0.08}$ MJy sr ^−1 . Comparing our measurements to those made by the COBE and Planck satellites, we find that at this flux density level, the 450 μ m EBL is entirely resolved by our SCUBA-2 observations. Thus, we find for the first time that discrete sources produce fully to the 450 μ m EBL, and that about half of it comes from sources with sub-mJy flux densities. Our deep number counts provide strong constraints on galaxy formation models.
abstract_unstemmed	The extragalactic background light (EBL) is the cumulative radiation outside the Milky Way. The determination of its corresponding primary emitting sources as well as its total energy level across the entire electromagnetic spectrum has profound implications for both cosmology and galaxy formation. However, the detailed origin of the EBL at far-infrared wavelengths, particularly those close to the peak of the cosmic infrared background, remains unclear. Here we report the results of our ongoing SCUBA-2 450 μ m survey of 10 massive galaxy cluster fields. By exploiting the strong gravitational lensing offered by these clusters, we obtain significant counts down to an unprecedented depth of ∼0.1 mJy at this wavelength, about 10 times deeper than that reached by any other previous survey. The cumulative energy density based on the counts is 138.1 ${}_{-19.3}^{+23.9}$ Jy deg ^−2 or 0.45 ${}_{-0.06}^{+0.08}$ MJy sr ^−1 . Comparing our measurements to those made by the COBE and Planck satellites, we find that at this flux density level, the 450 μ m EBL is entirely resolved by our SCUBA-2 observations. Thus, we find for the first time that discrete sources produce fully to the 450 μ m EBL, and that about half of it comes from sources with sub-mJy flux densities. Our deep number counts provide strong constraints on galaxy formation models.
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title_short	A Full Resolution of the 450 μm Extragalactic Background Light
url	https://doi.org/10.3847/2041-8213/ad3421 https://doaj.org/article/aa89494655d24f909a531724354f96cf https://doaj.org/toc/2041-8205
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A Full Resolution of the 450 μm Extragalactic Background Light

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