Are ultra-luminous infrared galaxies the dominant extragalactic population at high luminosities?
نویسندگان
چکیده
Based on the recent QSO surveys it is shown that, contrary to the widespread notion, high-luminousity QSOs are at least as numerous in the nearby universe as the ultraluminous far-infrared galaxies (ULIGs). Therefore, the fraction of ULIGs that have got a hidden quasar at the nucleus, for example in the dust shrouded phase, cannot be overwhelmingly large.
منابع مشابه
OPTICALLY FAINT COUNTERPARTS TO THE ISO-FIRBACK 170μm POPULATION: THE DISCOVERY OF COLD, LUMINOUS GALAXIES AT HIGH REDSHIFT
We present Keck spectroscopy and UKIRT near-IR imaging observations of two 170μm-selected sources from the ISO-FIRBACK survey which have faint counterparts in the optical, and r − K ∼ 5. Both sources were expected to lie at z > 1 based on their far-infrared, submillimeter and radio fluxes, assuming a similar spectral energy distribution to the local ultra-luminous infrared galaxy (ULIRG) Arp 22...
متن کاملConfirming a Population of Hot Dust Dominant, Star Forming Ultraluminous Galaxies at High-Redshift
We identify eight z > 1 radio sources undetected at 850μm but robustly detected at 70μm, confirming that they represent ultraluminous infrared galaxies (ULIRGs) with hotter dust temperatures (=52±10K) than Submillimetre Galaxies (SMGs) at similar luminosities and redshifts. These galaxies share many properties with SMGs: ultra-violet (UV) spectra consistent with starbursts, high stellar ma...
متن کاملAn atlas of mid-infrared spectra of star-forming and active galaxies
We present a panoramic atlas of Spitzer/IRS spectra of extragalactic sources collected from the recent literature, with value added measurements of their spectral features obtained in a homogeneous and concise manner. The atlas covers the full spectrum of the extragalactic universe and includes star forming galaxies, obscured and unobscured active galaxies, luminous and ultra-luminous infrared ...
متن کاملThe Rest-frame Optical Properties of Scuba Galaxies
We present optical and near-infrared photometry for a sample of 96 dusty, far-infrared luminous galaxies. We have precise spectroscopic redshifts for all these galaxies yielding a median redshift of < z>= 2.2. The majority, 78, are submillimeter-detected galaxies lying at z = 0.2–3.6, while the remaining 18 are optically-faint μJy radio galaxies at z = 0.9–3.4 which are proposed to be similarly...
متن کاملH2O emission in high-z ultra-luminous infrared galaxies⋆
Using the IRAM Plateau de Bure interferometer (PdBI), we report the detection of water vapor in six new lensed ultra-luminous starburst galaxies at high redshift, discovered in the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS). The sources are detected either in the 202−111 or 211−202 H2O emission lines with integrated line fluxes ranging from 1.8 to 14 Jy km s−1. The correspondi...
متن کامل