Sign on

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:1107.5065)
· References in the article
· Citations to the Article (70) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (25)
· NED Objects (20)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Far-infrared and Molecular CO Emission from the Host Galaxies of Faint Quasars at z ~ 6
Authors:
Wang, Ran; Wagg, Jeff; Carilli, Chris L.; Neri, Roberto; Walter, Fabian; Omont, Alain; Riechers, Dominik A.; Bertoldi, Frank; Menten, Karl M.; Cox, Pierre; Strauss, Michael A.; Fan, Xiaohui; Jiang, Linhua
Affiliation:
AA(National Radio Astronomy Observatory, P.O. Box 0, Socorro, NM 87801, USA ; Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA ; Jansky Fellow. ), AB(National Radio Astronomy Observatory, P.O. Box 0, Socorro, NM 87801, USA ; European Southern Observatory, Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago 19, Chile ), AC(National Radio Astronomy Observatory, P.O. Box 0, Socorro, NM 87801, USA ), AD(Institute de Radioastronomie Millimetrique, St. Martin d'Heres F-38406, France ), AE(Max-Planck-Institute for Astronomy, Königsstuhl 17, 69117 Heidelberg, Germany ), AF(Institut d'Astrophysique de Paris, CNRS and Université Pierre et Marie Curie, Paris, France ), AG(California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA ; Hubble Fellow.), AH(Argelander-Institut für Astronomie, University of Bonn, Auf dem Hügel 71, 53121 Bonn, Germany ), AI(Max-Planck-Institut für Radioastronomie, Auf dem Hügel 71, 53121 Bonn, Germany ), AJ(European Southern Observatory, Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago 19, Chile ), AK(Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA ), AL(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA ), AM(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA )
Publication:
The Astronomical Journal, Volume 142, Issue 4, article id. 101, 10 pp. (2011). (AJ Homepage)
Publication Date:
10/2011
Origin:
IOP
Astronomy Keywords:
galaxies: active, galaxies: high-redshift, galaxies: starburst, molecular data, quasars: general
DOI:
10.1088/0004-6256/142/4/101
Bibliographic Code:
2011AJ....142..101W

Abstract

We present new millimeter and radio observations of nine z ~ 6 quasars discovered in deep optical and near-infrared surveys. We observed the 250 GHz continuum in eight of the nine objects and detected three of them. New 1.4 GHz radio continuum data have been obtained for four sources, and one has been detected. We searched for molecular CO (6-5) line emission in the three 250 GHz detections and detected two of them. Combined with previous millimeter and radio observations, we study the far-infrared (FIR) and radio emission and quasar-host galaxy evolution with a sample of 18 z ~ 6 quasars that are faint at UV and optical wavelengths (rest-frame 1450 Å magnitudes of m 1450 >= 20.2). The average FIR-to-active galactic nucleus (AGN) UV luminosity ratio of this faint quasar sample is about two times higher than that of the bright quasars at z ~ 6 (m 1450 < 20.2). A fit to the average FIR and AGN bolometric luminosities of both the UV/optically faint and bright z ~ 6 quasars, and the average luminosities of samples of submillimeter/millimeter-observed quasars at z ~ 2-5, yields a relationship of L FIR ~ L bol 0.62. Five of the 18 faint z ~ 6 quasars have been detected at 250 GHz. These 250 GHz detections, as well as most of the millimeter-detected optically bright z ~ 6 quasars, follow a shallower trend of L FIR ~ L bol 0.45 defined by the starburst-AGN systems in local and high-z universe. The millimeter continuum detections in the five objects and molecular CO detections in three of them reveal a few × 108 M sun of FIR-emitting warm dust and 1010 M sun of molecular gas in the quasar host galaxies. All these results argue for massive star formation in the quasar host galaxies, with estimated star formation rates of a few hundred M sun yr-1. Additionally, the higher FIR-to-AGN luminosity ratio found in these 250 GHz detected faint quasars also suggests a higher ratio between star formation rate and supermassive black hole accretion rate than the UV/optically most luminous quasars at z ~ 6.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)


Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints