High-redshift SDSS Quasars with Weak Emission Lines

Aleksandar M. Diamond-Stanic; Xiaohui Fan; W. N. Brandt; Ohad Shemmer; Michael A. Strauss; Scott F. Anderson; Christopher L. Carilli; Robert R. Gibson; Linhua Jiang; J. Serena Kim; Gordon T. Richards; Gary D. Schmidt; Donald P. Schneider; Yue Shen; Paul S. Smith; Marianne Vestergaard; Jason E. Young

High-redshift SDSS Quasars with Weak Emission Lines

Aleksandar M. Diamond-Stanic, Xiaohui Fan, W. N. Brandt, Ohad Shemmer, Michael A. Strauss, Scott F. Anderson, Christopher L. Carilli, Robert R. Gibson, Linhua Jiang, J. Serena Kim, Gordon T. Richards, Gary D. Schmidt, Donald P. Schneider, Yue Shen, Paul S. Smith, Marianne Vestergaard, Jason E. Young

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90 Citationer (Scopus)

Abstract

We identify a sample of 74 high-redshift quasars (z > 3) with weak emission lines from the Fifth Data Release of the Sloan Digital Sky Survey and present infrared, optical, and radio observations of a subsample of four objects at z > 4. These weak emission-line quasars (WLQs) constitute a prominent tail of the Lya + N v equivalent width distribution, and we compare them to quasars with more typical emission-line properties and to low-redshift active galactic nuclei with weak/absent emission lines, namely BL Lac objects. We find that WLQs exhibit hot (T ~ 1000 K) thermal dust emission and have rest-frame 0.1-5 µm spectral energy distributions that are quite similar to those of normal quasars. The variability, polarization, and radio properties of WLQs are also different from those of BL Lacs, making continuum boosting by a relativistic jet an unlikely physical interpretation. The most probable scenario for WLQs involves broad-line region properties that are physically distinct from those of normal quasars.

Originalsprog	Engelsk
Tidsskrift	Astrophysical Journal
Vol/bind	699
Udgave nummer	1
Sider (fra-til)	782-799
ISSN	0004-637X
Status	Udgivet - 1 jul. 2009

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http://adsabs.harvard.edu/abs/2009ApJ...699..782D

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Diamond-Stanic, A. M., Fan, X., Brandt, W. N., Shemmer, O., Strauss, M. A., Anderson, S. F., Carilli, C. L., Gibson, R. R., Jiang, L., Kim, J. S., Richards, G. T., Schmidt, G. D., Schneider, D. P., Shen, Y., Smith, P. S., Vestergaard, M., & Young, J. E. (2009). High-redshift SDSS Quasars with Weak Emission Lines. Astrophysical Journal, 699(1), 782-799. http://adsabs.harvard.edu/abs/2009ApJ...699..782D

Diamond-Stanic, AM, Fan, X, Brandt, WN, Shemmer, O, Strauss, MA, Anderson, SF, Carilli, CL, Gibson, RR, Jiang, L, Kim, JS, Richards, GT, Schmidt, GD, Schneider, DP, Shen, Y, Smith, PS, Vestergaard, M & Young, JE 2009, 'High-redshift SDSS Quasars with Weak Emission Lines', Astrophysical Journal, bind 699, nr. 1, s. 782-799. <http://adsabs.harvard.edu/abs/2009ApJ...699..782D>

@article{9e4eafaabcfe4a91993daf4acba68833,

title = "High-redshift SDSS Quasars with Weak Emission Lines",

abstract = "We identify a sample of 74 high-redshift quasars (z > 3) with weak emission lines from the Fifth Data Release of the Sloan Digital Sky Survey and present infrared, optical, and radio observations of a subsample of four objects at z > 4. These weak emission-line quasars (WLQs) constitute a prominent tail of the Lya + N v equivalent width distribution, and we compare them to quasars with more typical emission-line properties and to low-redshift active galactic nuclei with weak/absent emission lines, namely BL Lac objects. We find that WLQs exhibit hot (T ~ 1000 K) thermal dust emission and have rest-frame 0.1-5 µm spectral energy distributions that are quite similar to those of normal quasars. The variability, polarization, and radio properties of WLQs are also different from those of BL Lacs, making continuum boosting by a relativistic jet an unlikely physical interpretation. The most probable scenario for WLQs involves broad-line region properties that are physically distinct from those of normal quasars.",

author = "Diamond-Stanic, {Aleksandar M.} and Xiaohui Fan and Brandt, {W. N.} and Ohad Shemmer and Strauss, {Michael A.} and Anderson, {Scott F.} and Carilli, {Christopher L.} and Gibson, {Robert R.} and Linhua Jiang and Kim, {J. Serena} and Richards, {Gordon T.} and Schmidt, {Gary D.} and Schneider, {Donald P.} and Yue Shen and Smith, {Paul S.} and Marianne Vestergaard and Young, {Jason E.}",

year = "2009",

month = jul,

day = "1",

language = "English",

volume = "699",

pages = "782--799",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "Institute of Physics Publishing, Inc",

number = "1",

}

TY - JOUR

T1 - High-redshift SDSS Quasars with Weak Emission Lines

AU - Diamond-Stanic, Aleksandar M.

AU - Fan, Xiaohui

AU - Brandt, W. N.

AU - Shemmer, Ohad

AU - Strauss, Michael A.

AU - Anderson, Scott F.

AU - Carilli, Christopher L.

AU - Gibson, Robert R.

AU - Jiang, Linhua

AU - Kim, J. Serena

AU - Richards, Gordon T.

AU - Schmidt, Gary D.

AU - Schneider, Donald P.

AU - Shen, Yue

AU - Smith, Paul S.

AU - Vestergaard, Marianne

AU - Young, Jason E.

PY - 2009/7/1

Y1 - 2009/7/1

N2 - We identify a sample of 74 high-redshift quasars (z > 3) with weak emission lines from the Fifth Data Release of the Sloan Digital Sky Survey and present infrared, optical, and radio observations of a subsample of four objects at z > 4. These weak emission-line quasars (WLQs) constitute a prominent tail of the Lya + N v equivalent width distribution, and we compare them to quasars with more typical emission-line properties and to low-redshift active galactic nuclei with weak/absent emission lines, namely BL Lac objects. We find that WLQs exhibit hot (T ~ 1000 K) thermal dust emission and have rest-frame 0.1-5 µm spectral energy distributions that are quite similar to those of normal quasars. The variability, polarization, and radio properties of WLQs are also different from those of BL Lacs, making continuum boosting by a relativistic jet an unlikely physical interpretation. The most probable scenario for WLQs involves broad-line region properties that are physically distinct from those of normal quasars.

AB - We identify a sample of 74 high-redshift quasars (z > 3) with weak emission lines from the Fifth Data Release of the Sloan Digital Sky Survey and present infrared, optical, and radio observations of a subsample of four objects at z > 4. These weak emission-line quasars (WLQs) constitute a prominent tail of the Lya + N v equivalent width distribution, and we compare them to quasars with more typical emission-line properties and to low-redshift active galactic nuclei with weak/absent emission lines, namely BL Lac objects. We find that WLQs exhibit hot (T ~ 1000 K) thermal dust emission and have rest-frame 0.1-5 µm spectral energy distributions that are quite similar to those of normal quasars. The variability, polarization, and radio properties of WLQs are also different from those of BL Lacs, making continuum boosting by a relativistic jet an unlikely physical interpretation. The most probable scenario for WLQs involves broad-line region properties that are physically distinct from those of normal quasars.

M3 - Journal article

SN - 0004-637X

VL - 699

SP - 782

EP - 799

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

High-redshift SDSS Quasars with Weak Emission Lines

Abstract

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