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Author(s): Greene, Jenny E.; Alexandroff, Rachael; Strauss, Michael A.; Zakamska, Nadia L; Lang, Dustin; et al

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Abstract: We present JHK near-infrared (NIR) spectroscopy of 25 candidate Type II quasars selected from the Sloan Digital Sky Survey (SDSS), using Triplespec on the Apache Point Observatory 3.5 m telescope, the Folded-port InfraRed Echellette at the Magellan/Baade 6.5 m telescope, and the Gemini Near-Infrared Spectrograph on Gemini. At redshifts of 2 < z < 3.4, our NIR spectra probe the rest-frame optical region of these targets, which were initially selected to have strong lines of Civ and Ly alpha, with FWHM < 2000 km s(-1) from the SDSS pipeline. We use the [O III] lambda 5007 line shape as a model for the narrow-line region emission and find that Ha consistently requires a broad component with FWHMs ranging from 1000 to 7500 km s(-1). Interestingly, the Civ lines also require broad bases, but with considerably narrower widths of 1000-4500 km s(-1). Estimating the extinction using the Balmer decrement and also the relationship in lower-z quasars between rest equivalent width and luminosity in the [Oiii] line, we find typical AV values of 0-2 mag, which naturally explains the attenuated C iv lines relative to Ha. We propose that our targets are moderately obscured quasars. We also describe one unusual object with three distinct velocity peaks in its [O III] spectrum.
Publication Date: 10-Jun-2014
Electronic Publication Date: 27-May-2014
Citation: Greene, Jenny E, Alexandroff, Rachael, Strauss, Michael A, Zakamska, Nadia L, Lang, Dustin, Liu, Guilin, Pattarakijwanich, Petchara, Hamann, Frederick, Ross, Nicholas P, Myers, Adam D, Brandt, W Niel, York, Donald, Schneider, Donald P. (2014). NEAR-INFRARED SPECTRA AND INTRINSIC LUMINOSITIES OF CANDIDATE TYPE II QUASARS AT 2 < z < 3.4. ASTROPHYSICAL JOURNAL, 788 (10.1088/0004-637X/788/1/91
DOI: doi:10.1088/0004-637X/788/1/91
ISSN: 0004-637X
EISSN: 1538-4357
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Type of Material: Journal Article
Journal/Proceeding Title: ASTROPHYSICAL JOURNAL
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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