FIR-luminous [C ii] Emitters in the ALMA-SCUBA-2 COSMOS Survey (AS2COSMOS): The Nature of Submillimeter Galaxies in a 10 Comoving Megaparsec-scale Structure at z similar to 4.6

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F21%3A00553712" target="_blank" >RIV/67985815:_____/21:00553712 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.3847/1538-4357/abcc72" target="_blank" >https://doi.org/10.3847/1538-4357/abcc72</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-4357/abcc72" target="_blank" >10.3847/1538-4357/abcc72</a>

Jazyk výsledku

angličtina

Název v původním jazyce

FIR-luminous [C ii] Emitters in the ALMA-SCUBA-2 COSMOS Survey (AS2COSMOS): The Nature of Submillimeter Galaxies in a 10 Comoving Megaparsec-scale Structure at z similar to 4.6

Popis výsledku v původním jazyce

We report the discovery of a 10 comoving megaparsec (cMpc)-scale structure traced by massive submillimeter galaxies (SMGs) at z similar to 4.6. These galaxies are selected from an emission line search of ALMA Band 7 observations targeting 184 luminous submillimeter sources (S-850 mu m >= 6.2 mJy) across 1.6 degrees(2) in the COSMOS field. We identify four [C ii] emitting SMGs and two probable [C ii] emitting SMG candidates at z = 4.60-4.64 with velocity-integrated signal-to-noise ratio of S/N > 8. Four of the six emitters are near-infrared blank SMGs. After excluding one SMG whose emission line is falling at the edge of the spectral window, all galaxies show clear velocity gradients along the major axes that are consistent with rotating gas disks. The estimated rotation velocities of the disks are 330-550 km s(-1) and the inferred host dark-matter halo masses are similar to 2-8 x 10(12) M. From their estimated halo masses and [C ii] luminosity function, we suggest that these galaxies have a high (50%-100%) duty cycle and high (similar to 0.1) baryon conversion efficiency (SFR relative to baryon accretion rate), and that they contribute 2% to the total star formation rate density at z = 4.6. These SMGs are concentrated within just 0.3% of the full survey volume, suggesting they are strongly clustered. The extent of this structure and the individual halo masses suggest that these SMGs will likely evolve into members of a similar to 10(15) M cluster at z = 0. This survey reveals a synchronized dusty starburst in massive halos at z > 4, which could be driven by mergers or fed by smooth gas accretion.

Název v anglickém jazyce

FIR-luminous [C ii] Emitters in the ALMA-SCUBA-2 COSMOS Survey (AS2COSMOS): The Nature of Submillimeter Galaxies in a 10 Comoving Megaparsec-scale Structure at z similar to 4.6

Popis výsledku anglicky

We report the discovery of a 10 comoving megaparsec (cMpc)-scale structure traced by massive submillimeter galaxies (SMGs) at z similar to 4.6. These galaxies are selected from an emission line search of ALMA Band 7 observations targeting 184 luminous submillimeter sources (S-850 mu m >= 6.2 mJy) across 1.6 degrees(2) in the COSMOS field. We identify four [C ii] emitting SMGs and two probable [C ii] emitting SMG candidates at z = 4.60-4.64 with velocity-integrated signal-to-noise ratio of S/N > 8. Four of the six emitters are near-infrared blank SMGs. After excluding one SMG whose emission line is falling at the edge of the spectral window, all galaxies show clear velocity gradients along the major axes that are consistent with rotating gas disks. The estimated rotation velocities of the disks are 330-550 km s(-1) and the inferred host dark-matter halo masses are similar to 2-8 x 10(12) M. From their estimated halo masses and [C ii] luminosity function, we suggest that these galaxies have a high (50%-100%) duty cycle and high (similar to 0.1) baryon conversion efficiency (SFR relative to baryon accretion rate), and that they contribute 2% to the total star formation rate density at z = 4.6. These SMGs are concentrated within just 0.3% of the full survey volume, suggesting they are strongly clustered. The extent of this structure and the individual halo masses suggest that these SMGs will likely evolve into members of a similar to 10(15) M cluster at z = 0. This survey reveals a synchronized dusty starburst in massive halos at z > 4, which could be driven by mergers or fed by smooth gas accretion.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

—

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astrophysical Journal

ISSN

0004-637X

e-ISSN

1538-4357

Svazek periodika

907

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

122

Kód UT WoS článku

000615207200001

EID výsledku v databázi Scopus

2-s2.0-85101350683