Extremely red quasars in BOSS
Author(s): Hamann, Fred; Zakamska, Nadia L; Ross, Nicholas; Paris, Isabelle; Alexandroff, Rachael M; et al
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Full metadata record
DC Field | Value | Language |
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dc.contributor.author | Hamann, Fred | - |
dc.contributor.author | Zakamska, Nadia L | - |
dc.contributor.author | Ross, Nicholas | - |
dc.contributor.author | Paris, Isabelle | - |
dc.contributor.author | Alexandroff, Rachael M | - |
dc.contributor.author | Villforth, Carolin | - |
dc.contributor.author | Richards, Gordon T | - |
dc.contributor.author | Herbst, Hanna | - |
dc.contributor.author | Brandt, W Niel | - |
dc.contributor.author | Cook, Ben | - |
dc.contributor.author | Denney, Kelly D | - |
dc.contributor.author | Greene, Jenny E. | - |
dc.contributor.author | Schneider, Donald P | - |
dc.contributor.author | Strauss, Michael A. | - |
dc.date.accessioned | 2019-08-29T17:05:02Z | - |
dc.date.available | 2019-08-29T17:05:02Z | - |
dc.date.issued | 2017-01 | en_US |
dc.identifier.citation | Hamann, Fred, Zakamska, Nadia L, Ross, Nicholas, Paris, Isabelle, Alexandroff, Rachael M, Villforth, Carolin, Richards, Gordon T, Herbst, Hanna, Brandt, W Niel, Cook, Ben, Denney, Kelly D, Greene, Jenny E, Schneider, Donald P, Strauss, Michael A. (2017). Extremely red quasars in BOSS. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 464 (3431 - 3463. doi:10.1093/mnras/stw2387 | en_US |
dc.identifier.issn | 0035-8711 | - |
dc.identifier.uri | http://arks.princeton.edu/ark:/88435/pr15436 | - |
dc.description.abstract | Red quasars are candidate young objects in an early transition stage of massive galaxy evolution. Our team recently discovered a population of extremely red quasars (ERQs) in the Baryon Oscillation Spectroscopic Survey (BOSS) that has a suite of peculiar emission-line properties including large rest equivalent widths (REWs), unusual ‘wingless’ line profiles, large N-V/L-y alpha, N-V/C (IV), Si (IV)/C (IV) and other flux ratios, and very broad and blueshifted [O (III)]lambda 5007. Here we present a new catalogue of C-IV and N-V emission-line data for 216 188 BOSS quasars to characterize the ERQ line properties further. We show that they depend sharply on UV-to-mid-IR colour, secondarily on REW(C (IV)), and not at all on luminosity or the Baldwin Effect. We identify a ‘core’ sample of 97 ERQs with nearly uniform peculiar properties selected via i-W3 >= 4.6 (AB) and REW(C (IV)) >= 100 angstrom at redshifts 2.0-3.4. A broader search finds 235 more red quasars with similar unusual characteristics. The core ERQs have median luminosity log L(ergs s(-1)) similar to 47.1, sky density 0.010 deg(-2), surprisingly flat/blue UV spectra given their red UV-to-mid-IR colours, and common outflow signatures including BALs or BAL-like features and large C (IV) emission-line blueshifts. Their SEDs and line properties are inconsistent with normal quasars behind a dust reddening screen. We argue that the core ERQs are a unique obscured quasar population with extreme physical conditions related to powerful outflows across the line-forming regions. Patchy obscuration by small dusty clouds could produce the observed UV extinctions without substantial UV reddening. | en_US |
dc.format.extent | 3431 - 3463 | en_US |
dc.language.iso | en_US | en_US |
dc.relation | https://ui.adsabs.harvard.edu/abs/2017MNRAS.464.3431H/abstract | en_US |
dc.relation.ispartof | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | en_US |
dc.rights | Final published version. Article is made available in OAR by the publisher's permission or policy. | en_US |
dc.title | Extremely red quasars in BOSS | en_US |
dc.type | Journal Article | en_US |
dc.identifier.doi | doi:10.1093/mnras/stw2387 | - |
dc.date.eissued | 2016-09-26 | en_US |
dc.identifier.eissn | 1365-2966 | - |
pu.type.symplectic | http://www.symplectic.co.uk/publications/atom-terms/1.0/journal-article | en_US |
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stw2387.pdf | 14.09 MB | Adobe PDF | View/Download |
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