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OPTICAL-FAINT, FAR-INFRARED-BRIGHT HERSCHEL SOURCES IN THE CANDELS FIELDS: ULTRA-LUMINOUS INFRARED GALAXIES AT z > 1 AND THE EFFECT OF SOURCE BLENDING
被引：10
|作者：
Yan, Haojing
[1
]
Stefanon, Mauro
[1
]
Ma, Zhiyuan
[1
]
Willner, S. P.
[2
]
Somerville, Rachel
[3
]
Ashby, Matthew L. N.
[2
]
Dave, Romeel
[4
]
Perez-Gonzalez, Pablo G.
[5
]
Cava, Antonio
[6
]
Wiklind, Tommy
[7
]
Kocevski, Dale
[8
]
Rafelski, Marc
[9
]
Kartaltepe, Jeyhan
[10
]
Cooray, Asantha
[11
]
Koekemoer, Anton M.
[12
]
Grogin, Norman A.
[12
]
机构：
[1] Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA
[2] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[3] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA
[4] Univ Western Cape, ZA-7535 Cape Town, South Africa
[5] Univ Complutense Madrid, Dept Astrofis, Fac CC Fis, E-28040 Madrid, Spain
[6] Univ Geneva, Observ Geneva, CH-1290 Versoix, Switzerland
[7] Joint ALMA Observ, Santiago, Chile
[8] Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA
[9] CALTECH, Infrared Proc & Anal Ctr, Pasadena, CA 91125 USA
[10] Natl Opt Astron Observ, Tucson, AZ 85719 USA
[11] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
[12] Space Telescope Sci Inst, Baltimore, MD 21218 USA
来源：
基金：
美国国家航空航天局;
美国国家科学基金会;
关键词：
galaxies: starburst;
infrared: galaxies;
methods: data analysis;
submillimeter: galaxies;
STAR-FORMATION HISTORIES;
DEEP-FIELD;
SUBMILLIMETER GALAXIES;
MASSIVE GALAXIES;
ALMA SURVEY;
PHOTOMETRIC REDSHIFTS;
FORMING GALAXIES;
FORMATION RATES;
DATA REDUCTION;
LEGACY SURVEY;
D O I：
10.1088/0067-0049/213/1/2
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The Herschel very wide field surveys have charted hundreds of square degrees in multiple far-IR (FIR) bands. While the Sloan Digital Sky Survey (SDSS) is currently the best resource for optical counterpart identifications over such wide areas, it does not detect a large number of Herschel FIR sources and leaves their nature undetermined. As a test case, we studied seven "SDSS-invisible," very bright 250 mu m sources (S-250 > 55 mJy) in the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey fields where we have a rich multi-wavelength data set. We took a new approach to decompose the FIR sources, using the near-IR or the optical images directly for position priors. This is an improvement over the previous decomposition efforts where the priors are from mid-IR data that still suffer from the problem of source blending. We found that in most cases the single Herschel sources are made of multiple components that are not necessarily at the same redshifts. Our decomposition succeeded in identifying and extracting their major contributors. We show that these are all ultra-luminous infrared galaxies at z similar to 1-2 whose high L-IR is mainly due to dust-obscured star formation. Most of them would not be selected as submillimeter galaxies. They all have complicated morphologies indicative of mergers or violent instability, and their stellar populations are heterogeneous in terms of stellar masses, ages, and formation histories. Their current ultra-luminous infrared galaxy phases are of various degrees of importance in their stellar mass assembly. Our practice provides a promising starting point for developing an automatic routine to reliably study bright Herschel sources.
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