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

作者：Norris Ray P^*; Afonso Jose; Cava Antonio; Farrah Duncan; Huynh Minh T; Ivison R J; Jarvis Matt; Lacy Mark; Mao Minnie; Maraston Claudia; Mauduit Jean Christophe; Middelberg Enno; Oliver Seb; Seymour Nick; Surace Jason

来源：Astrophysical Journal, 2011, 736(1): 55.

DOI：10.1088/0004-637X/736/1/55

• galaxies: evolution
• galaxies: formation
• galaxies: starburst

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.

• 出版日期2011-7-20
• 单位CSIRO