Discovery of H alpha absorption in the unusual broad absorption line quasar SDSS J083942.11+380526.3

Abstract

We discovered an H alpha absorption in a broad H alpha emission line of an unusual broad absorption line quasar, SDSS J083942.11+380526.3 at z=2.318, by near-infrared spectroscopy with the Cooled Infrared Spectrograph and Camera for OHS (CISCO) on the Subaru telescope. The Presence of non-stellar H alpha absorption is known only in the Seyfert galaxy NGC 4151 to date, thus our discovery is the first case for quasars. The H alpha absorption line is blueshifted by 520 km/s relative to the H alpha emission line, and its redshift almost coincides with those of UV low-ionization metal absorption lines. The width of the H alpha absorption (~ 340 km/s) is similar to those of the UV low-ionization absorption lines. These facts suggest that the H alpha and the low-ionization metal absorption lines are produced by the same low-ionization gas which has a substantial amount of neutral gas. The column density of the neutral hydrogen is estimated to be ~ 10^18 cm^-2 by assuming a gas temperature of 10,000 K from the analysis of the curve of growth. The continuum spectrum is reproduced by a reddened (E(B-V) ~ 0.15 mag for the SMC-like reddening law) composite quasar spectrum. Furthermore, the UV spectrum of SDSS J083942.11+380526.3 shows a remarkable similarity to that of NGC 4151 in its low state, suggesting the physical condition of the absorber in SDSS J083942.11+380526.3 is similar to that of NGC 4151 in the low state. As proposed for NGC 4151, SDSS J083942.11+380526.3 may be also seen through the close direction of the surface of the obscuring torus.

arXiv commentAccepted for publication in ApJ

References in corpus (30)

• The Sloan Digital Sky Survey: Technical Summary
• Composite Quasar Spectra From the Sloan Digital Sky Survey
• The Third Data Release of the Sloan Digital Sky Survey
• Red and Reddened Quasars in the Sloan Digital Sky Survey
• Unusual Broad Absorption Line Quasars from the Sloan Digital Sky Survey
• The FIRST Bright Quasar Survey. II. 60 Nights and 1200 Spectra Later
• The Sloan Digital Sky Survey Quasar Catalog III. Third Data Release
• The Frequency and Radio Properties of Broad Absorption Line Quasars
• Properties of Radio-Selected Broad Absorption-Line Quasars from the FIRST Survey
• Continuum and Emission-Line Properties of Broad Absorption Line Quasars
• Dust Reddening in SDSS Quasars
• Composite Spectra from the FIRST Bright Quasar Survey
• The Sloan Digital Sky Survey Quasar Catalog II. First Data Release
• The Sloan Digital Sky Survey Quasar Catalog I. Early Data Release
• Current Performance and On-Going Improvements of the 8.2 m Subaru Telescope
• Polarization of Broad Absorption Line QSOs I. A Spectropolarimetric Atlas
• The FIRST Radio-Loud Broad Absorption Line QSO and Evidence for a Hidden Population of Quasars
• Searching For the Physical Drivers of Eigenvector 1: Influence of Black Hole Mass and Eddington Ratio
• Kinematic Linkage Between the Broad and Narrow Line Emitting Gas in AGN
• THE POLARIZED SPECTRUM OF THE FE II-RICH BAL QSO, IRAS 07598+6508
• STIS Echelle Observations of the Seyfert Galaxy NGC 4151: Physical Conditions in the Ultraviolet Absorbers
• CISCO: Cooled Infrared Spectrograph and Camera for OHS on the Subaru Telescope
• Eddington Accretion and QSO Emission Lines at z ~ 2
• HAWAII 167 and Q0059-2735: Heavily Dust-Enshrouded Young QSOs
• The Reddest Quasars II. A gravitationally-lensed FeLoBAL quasar
• The Largest Blueshifts of [O III] emission line in Two Narrow-Line Quasars
• STIS Echelle Observations of NGC 4151: Variable Ionization of the Intrinsic UV Absorbers
• Balmer and He I absorption in the nuclear spectrum of NGC 4151
• Red Quasars and Quasar Evolution: the Case of BALQSO FIRST J155633.8+351758
• Peculiar Broad Absorption Line Quasars found in DPOSS

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• Ultra-dense Broad-line Region Scale Outflow in Highly Reddened Quasar SDSS J145057.28+530007.6
• CO Observations of a FeLoBAL Quasar with an H alpha Absorption Line at z=2.3