CONFIRMING THE EXISTENCE OF A QUIESCENT GALAXY POPULATION OUT TO z=3: A STACKING ANALYSIS OF MID-, FAR-INFRARED, AND RADIO DATA

Autor: Benjamin Magnelli, Vernesa Smolčić, Sune Toft, Allison W. S. Man, Yanxia Li, F. Navarrete, Eva Schinnerer, David B. Sanders, Frank Bertoldi, N. Lee, Caitlin M. Casey, Kartik Sheth, Mara Salvato, Emeric Le Floc'h, Andrew Zirm, Olivier Ilbert, Thomas R. Greve, Alexander Karim
Přispěvatelé: Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Max-Planck-Institut für Astronomie (MPIA), Max-Planck-Gesellschaft, Département d'Astrophysique (ex SAP) (DAP), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Argelander Institute for Astronomy (AlfA), Rheinische Friedrich-Wilhelms-Universität Bonn, Spitzer Science Center, California Institute of Technology, Pasadena, California Institute of Technology (CALTECH), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES)
Jazyk: angličtina
Rok vydání: 2016
Předmět:
Zdroj: The Astrophysical Journal
The Astrophysical Journal, 2016, 820 (1), ⟨10.3847/0004-637X/820/1/11⟩
Astrophysical Journal
Volume 820
The Astrophysical Journal, American Astronomical Society, 2016, 820 (1), ⟨10.3847/0004-637X/820/1/11⟩
ISSN: 0004-637X
1538-4357
0067-0049
1538-3873
1538-3881
DOI: 10.3847/0004-637X/820/1/11⟩
Popis: We performed a comprehensive stacking analysis on ∼14, 200 quiescent galaxy (QG) candidates at z = 0–3 across mid-, far-infrared (MIR and FIR), and radio wavelengths. Identified via their rest- frame NUV ‑ r and r ‑ J colors, the QG candidates ({; ; ; M}; ; ; \star ={; ; ; 10}; ; ; 9.8{; ; ; {; ; ; {; ; ; --}; ; ; }; ; ; 12.2}; ; ; {; ; ; M}; ; ; ȯ ) have drastically different IR and radio properties depending on their 24 μm emission strength. The fraction of QG candidates with strong 24 μm emission (equivalent to inferred star formation rates SFR{; ; ; }; ; ; 24≥slant 100 {; ; ; M}; ; ; ȯ {; ; ; {; ; ; yr}; ; ; }; ; ; -1, hereafter “IR-bright”) increases with redshift and peaks at 15%, and their stacked MIPS 24 μm, Herschel (PACS and SPIRE) and VLA emissions are consistent with being star-forming galaxies (SFGs). In contrast, the majority of QG candidates are faint or undetected at 24 μm individually (i.e., SFR24 < 100 M⊙ yr‑1, hereafter “IR-faint”). Their low dust-obscured SFRs derived from Herschel stacking (SFRH ≲ 3, 15, 50 M⊙ yr‑1 out to z ∼ 1, 2, 3) are >2.5– 12.5× lower than compared to SFGs. This is consistent with the quiescence, as expected from their low unobscured SFRs, as inferred from modeling their ultraviolet-to-NIR photometry. The discrepancy between the LIR derived from stacking Herschel and 24 μm indicates that IR-faint QGs have dust SEDs that are different from those of SFGs. For the most massive ({; ; ; M}; ; ; \star ≥slant {; ; ; 10}; ; ; 11 {; ; ; M}; ; ; ȯ ) IR-faint QGs at z < 1.5, the stacked 1.4 GHz emission is in excess of that expected from other SFR indicators, suggesting a widespread presence of low-luminosity active galactic nuclei. Our results reaffirm the existence of a significant population of QGs out to z = 3, thus corroborating the need to quench star formation in galaxies at early epochs.
Databáze: OpenAIRE
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