DEEP SPITZER OBSERVATIONS OF INFRARED-FAINT RADIO SOURCES: HIGH-REDSHIFT RADIO-LOUD ACTIVE GALACTIC NUCLEI?

被引：30

作者：

Norris, Ray P. ^{[1
]}

Afonso, Jose ^{[2
,3
]}

Cava, Antonio ^{[4
]}

Farrah, Duncan ^{[5
]}

Huynh, Minh T. ^{[6
]}

Ivison, R. J. ^{[7
,8
]}

Jarvis, Matt ^{[9
]}

Lacy, Mark ^{[10
]}

Mao, Minnie ^{[1
,11
,12
]}

Maraston, Claudia ^{[13
]}

Mauduit, Jean-Christophe ^{[6
]}

Middelberg, Enno ^{[14
]}

Oliver, Seb ^{[5
]}

Seymour, Nick ^{[15
]}

Surace, Jason ^{[6
]}

机构：

[1] CSIRO, Australia Telescope Natl Facil, Epping, NSW 1710, Australia

[2] Univ Lisbon, Fac Ciencias, Observ Astron Lisboa, P-1349018 Lisbon, Portugal

[3] Univ Lisbon, Ctr Astron & Astrofis, P-1349018 Lisbon, Portugal

[4] Univ Complutense Madrid, Dept Astrofis, Fac CC Fis, E-28040 Madrid, Spain

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

[6] CALTECH, Infrared Proc & Anal Ctr, Pasadena, CA 91125 USA

[7] Royal Observ, UK Astron Technol Ctr, Edinburgh EH9 3HJ, Midlothian, Scotland

[8] Univ Edinburgh, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland

[9] Univ Hertfordshire, Ctr Astrophys, Sci & Technol Res Inst, Hatfield AL10 9AB, Herts, England

[10] NRAO, Charlottesville, VA 22903 USA

[11] Univ Tasmania, Sch Math & Phys, Hobart, Tas 7001, Australia

[12] Anglo Australian Observ, Epping, NSW 1710, Australia

[13] Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England

[14] Ruhr Univ Bochum, Astron Inst, D-44801 Bochum, Germany

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

来源：

ASTROPHYSICAL JOURNAL | 2011年 / 736卷 / 01期

关键词：

galaxies: evolution; galaxies: formation; galaxies: starburst; BASE-LINE INTERFEROMETRY; K-Z RELATION; SUBMILLIMETER GALAXIES; EXTRAGALACTIC FIELD; Z-SIMILAR-TO-2; 1ST; POPULATION; EVOLUTION; DISCOVERY; SPECTRA;

D O I：

10.1088/0004-637X/736/1/55

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Infrared-faint radio sources (IFRSs) are a rare class of objects which are relatively bright at radio wavelengths but very faint at infrared and optical wavelengths. Here we present sensitive near-infrared observations of a sample of these sources taken as part of the Spitzer Extragalactic Representative Volume Survey. Nearly all the IFRSs are undetected at a level of similar to 1 mu Jy in these new deep observations, and even the detections are consistent with confusion with unrelated galaxies. A stacked image implies that the median flux density is S-3.6 mu m similar to 0.2 mu Jy or less, giving extreme values of the radio-infrared flux density ratio. Comparison of these objects with known classes of object suggests that the majority are probably high-redshift radio-loud galaxies, possibly suffering from significant dust extinction.

引用

页数：8

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