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    The REQUIEM Survey. I. A Search for Extended Lyα Nebular Emission Around 31 z > 5.7 Quasars

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    Farina_2019_ApJ_887_196.pdf
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    Author
    Farina, Emanuele Paolo
    Arrigoni-Battaia, Fabrizio
    Costa, Tiago
    Walter, Fabian cc
    Hennawi, Joseph F.
    Drake, Alyssa B.
    Decarli, Roberto
    Gutcke, Thales A.
    Mazzucchelli, Chiara
    Neeleman, Marcel
    Georgiev, Iskren
    Eilers, Anna-Christina
    Davies, Frederick B.
    Bañados, Eduardo cc
    Fan, Xiaohui
    Onoue, Masafusa
    Schindler, Jan-Torge
    Venemans, Bram P.
    Wang, Feige cc
    Yang, Jinyi
    Rabien, Sebastian
    Busoni, Lorenzo
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    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2019-12-19
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Emanuele Paolo Farina et al 2019 ApJ 887 196
    Journal
    ASTROPHYSICAL JOURNAL
    Rights
    Copyright © 2019. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    The discovery of quasars a few hundred megayears after the Big Bang represents a major challenge to our understanding of black holes as well as galaxy formation and evolution. Quasars' luminosity is produced by extreme gas accretion onto black holes, which have already reached masses of M-BH > 10(9) M-circle dot by z similar to 6. Simultaneously, their host galaxies form hundreds of stars per year, using up gas in the process. To understand which environments are able to sustain the rapid formation of these extreme sources, we started a Very Large Telescope/Multi-Unit Spectroscopic Explorer (MUSE) effort aimed at characterizing the surroundings of a sample of 5.7 < z < 6.6 quasars, which we have dubbed the Reionization Epoch QUasar InvEstigation with MUSE (REQUIEM) survey. We here present results of our searches for extended Ly alpha halos around the first 31 targets observed as part of this program. Reaching 5 sigma surface brightness limits of 0.1-1.1 x 10(-17) erg s(-1) cm(-2) arcsec(-2) over a 1 arcsec(2) aperture, we were able to unveil the presence of 12 Ly alpha nebulae, eight of which are newly discovered. The detected nebulae show a variety of emission properties and morphologies with luminosities ranging from 8 x 10(42) to 2 x 10(44) erg s(-1), FWHMs between 300 and 1700 km s(-1), sizes <30 pkpc, and redshifts consistent with those of the quasar host galaxies. As the first statistical and homogeneous investigation of the circumgalactic medium of massive galaxies at the end of the reionization epoch, the REQUIEM survey enables the study of the evolution of the cool gas surrounding quasars in the first 3 Gyr of the universe. A comparison with the extended Ly alpha emission observed around bright (M-1450 less than or similar to -25 mag) quasars at intermediate redshift indicates little variations on the properties of the cool gas from z similar to 6 to z similar to 3, followed by a decline in the average surface brightness down to z similar to 2.
    ISSN
    0004-637X
    DOI
    10.3847/1538-4357/ab5847
    Version
    Final published version
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/ab5847
    Scopus Count
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    UA Faculty Publications

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