MULTI-WAVELENGTH SEDs OF HERSCHEL-SELECTED GALAXIES IN THE COSMOS FIELD

被引：62

作者：

Lee, Nicholas ^{[1
]}

Sanders, D. B. ^{[1
]}

Casey, Caitlin M. ^{[1
]}

Scoville, N. Z. ^{[2
]}

Hung, Chao-Ling ^{[1
]}

Le Floc'h, Emeric ^{[3
]}

Ilbert, Olivier ^{[4
]}

Aussel, Herve ^{[3
]}

Capak, Peter ^{[2
,5
]}

Kartaltepe, Jeyhan S. ^{[6
]}

Roseboom, Isaac ^{[7
]}

Salvato, Mara ^{[8
,9
]}

Aravena, M. ^{[10
,11
]}

Berta, S. ^{[12
]}

Bock, J. ^{[2
,13
]}

Oliver, S. J. ^{[7
]}

Riguccini, L. ^{[14
,15
]}

Symeonidis, M. ^{[16
,17
]}

机构：

[1] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[2] CALTECH, Pasadena, CA 91125 USA

[3] CEA Saclay, UMR AIM CEA CNRS UP7, F-91191 Gif Sur Yvette, France

[4] Aix Marseille Univ, CNRS, LAM, UMR 7326, F-13388 Marseille, France

[5] Spitzer Sci Ctr, Pasadena, CA 91125 USA

[6] Natl Opt Astron Observ, Tucson, AZ 85719 USA

[7] Univ Edinburgh, Inst Astron, Royal Observ, Edinburgh EH9 3HJ, Midlothian, Scotland

[8] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

[9] Cluster Excellence, D-85748 Garching, Germany

[10] European So Observ, Vitacura Santiago, Chile

[11] Univ Diego Portales, Fac Engn, Santiago, Chile

[12] Max Planck Inst Extraterr Phys MPE, D-85741 Garching, Germany

[13] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[14] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA

[15] BAER Inst, Santa Rosa, CA USA

[16] Univ Sussex, Dept Phys & Astron, Brighton BN1 9QH, E Sussex, England

[17] Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England

来源：

ASTROPHYSICAL JOURNAL | 2013年 / 778卷 / 02期

基金：

美国国家科学基金会;

关键词：

galaxies: evolution; galaxies: high-redshift; infrared: galaxies; ACTIVE GALACTIC NUCLEI; SPECTRAL ENERGY-DISTRIBUTIONS; STAR-FORMING GALAXIES; LUMINOUS INFRARED GALAXIES; AZTEC MILLIMETER SURVEY; EVOLUTION SURVEY COSMOS; LESS-THAN; HIGH-REDSHIFT; MU-M; ULTRALUMINOUS GALAXIES;

D O I：

10.1088/0004-637X/778/2/131

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We combine Herschel Photodetector Array Camera and Spectrometer and Spectral and Photometric Imaging Receiver maps of the full 2 deg(2) Cosmic Evolution Survey (COSMOS) field with existing multi-wavelength data to obtain template and model-independent optical-to-far-infrared spectral energy distributions (SEDs) for 4218 Herschel-selected sources with log(L-IR/L-circle dot) = 9.4-13.6 and z = 0.02-3.54. Median SEDs are created by binning the optical to far-infrared (FIR) bands available in COSMOS as a function of infrared luminosity. Herschel probes rest-frame wavelengths where the bulk of the infrared radiation is emitted, allowing us to more accurately determine fundamental dust properties of our sample of infrared luminous galaxies. We find that the SED peak wavelength (lambda(peak)) decreases and the dust mass (M-dust) increases with increasing total infrared luminosity (LIR). In the lowest infrared luminosity galaxies (log(L-IR/L-circle dot) = 10.0-11.5), we see evidence of polycyclic aromatic hydrocarbon (PAH) features (lambda similar to 7-9 mu m), while in the highest infrared luminosity galaxies (L-IR > 10(12) L-circle dot) we see an increasing contribution of hot dust and/or power-law emission, consistent with the presence of heating from an active galactic nucleus (AGN). We study the relationship between stellar mass and star formation rate of our sample of infrared luminous galaxies and find no evidence that Herschel-selected galaxies follow the SFR/M-* "main sequence" as previously determined from studies of optically selected, star-forming galaxies. Finally, we compare the mid-infrared to FIR properties of our infrared luminous galaxies using the previously defined diagnostic, IR8 L-IR/L-8, and find that galaxies with L-IR greater than or similar to 10(11.3) L-circle dot tend to systematically lie above (x3-5) the IR8 "infrared main sequence," suggesting either suppressed PAH emission or an increasing contribution from AGN heating.

引用

页数：10

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