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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29087
Title: The Hunt for Red Quasars: Luminous Obscured Black Hole Growth Unveiled in the Stripe 82 X-Ray Survey
Authors: LaMassa, Stephanie M.
Glikman, Eilat
Brusa, Marcella
Rigby, Jane R.
Tasnim Ananna, Tonima
Stern, Daniel
Lira, Paulina
Urry, C. Megan
Salvato, Mara
Alexandroff, Rachael
Allevato, Viola
Cardamone, Carolin
Civano, Francesca
Coppi, Paolo
Farrah, Duncan
Komossa, S.
LANZUISI, Giorgio 
MARCHESI, STEFANO 
Richards, Gordon
Trakhtenbrot, Benny
Treister, Ezequiel
Issue Date: 2017
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 847
Issue: 2
First Page: 100
Abstract: We present results of a ground-based near-infrared campaign with Palomar TripleSpec, Keck NIRSPEC, and Gemini GNIRS to target two samples of reddened active galactic nucleus (AGN) candidates from the 31 deg<SUP>2</SUP> Stripe 82 X-ray survey. One sample, which is ∼89% complete to K< 16 (Vega), consists of eight confirmed AGNs, four of which were identified with our follow-up program, and is selected to have red R - K colors (> 4, Vega). The fainter sample (K> 17, Vega) represents a pilot program to follow-up four sources from a parent sample of 34 that are not detected in the single-epoch SDSS catalog and have WISE quasar colors. All 12 sources are broad-line AGNs (at least one permitted emission line has an FWHM exceeding 1300 km s<SUP>-1</SUP>) and span a redshift range 0.59< z< 2.5. Half the (R - K)-selected AGNs have features in their spectra suggestive of outflows. When comparing these sources to a matched sample of blue Type 1 AGNs, we find that the reddened AGNs are more distant (z> 0.5), and a greater percentage have high X-ray luminosities ({L}<SUB>{{X</SUB>},{full}}> {10}<SUP>44</SUP> erg s<SUP>-1</SUP>). Such outflows and high luminosities may be consistent with the paradigm that reddened broad-line AGNs represent a transitory phase in AGN evolution as described by the major merger model for black hole growth. Results from our pilot program demonstrate proof of concept that our selection technique is successful in discovering reddened quasars at z> 1 missed by optical surveys.
URI: http://hdl.handle.net/20.500.12386/29087
URL: https://iopscience.iop.org/article/10.3847/1538-4357/aa937d
ISSN: 0004-637X
DOI: 10.3847/1538-4357/aa87b5
Bibcode ADS: 2017ApJ...847..100L
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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