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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 198559.0, MPI für Astronomie / Publikationen_mpia
The near-IR properties and continuum shapes of
high redshift quasars from the Sloan Digital Sky
Survey
Authors:Pentericci, L.; Rix, H.-W.; Prada, F.; Fan, X.; Strauss, M. A.; Schneider, D. P.; Grebel, E. K.; Harbeck, D.; Brinkmann, J.; Narayanan, V. K.
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Astronomy and Astrophysics
Journal Abbrev.:Astronomy and Astrophysics
Volume:410
Start Page:75
End Page:82
Review Status:not specified
Audience:Not Specified
Abstract / Description:We present J-H-K' photometry for a sample of
45 high redshift quasars found by the Sloan
Digital Sky Survey. The sample was originally
selected on the basis of optical colors and spans
a redshift range from 3.6 to 5.03. Our
photometry reflects the rest-frame SED longward
of Lyalpha for all redshifts. The results show
that the near-IR colors of high redshift quasars
are quite uniform. We have modelled the continuum
shape of the quasars (from just beyond Lyalpha
to ~ 4000 Aring;) with a power law of the
form fnu ~ nu \alpha, and
find lt; alpha gt; =-0.57 with a scatter of
0.33. This value is similar to what is found for
lower redshift quasars over the same restframe
wavelength range, and {we conclude that} there is
hardly any evolution in the continuum properties
of optically selected quasars up to redshift 5.
The spectral indices found by combining near-IR
with optical photometry are in general
consistent but slightly flatter than what is
found for the same quasars using the optical
spectra and photometry alone, showing that the
continuum region used to determine the spectral
indices can somewhat influence the results.
Free Keywords:galaxies: active; quasars: general;
; infrared: general; cosmology: observations
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:Konigstuhl 17, 69117, Heidelberg, Germany),
AB(Max-Planck-Institut fur Astronomie, Konigstuhl
17, 69117, Heidelberg, Germany), AC(Instituto de
Astrofisica de Canarias, 38205 La Laguna,
Tenerife, Spain), AD(Steward Observatory, The
University of Arizona 933 N. Cherry Ave, Tucson,
AZ 85721-0065 Arizona, USA), AE(Princeton
University Observatory, Princeton 08544, USA),
AF(Department of Astronomy and Astrophysics, The
Pennsylvania State University, University Park,
PA 16802, USA), AG(Max-Planck-Institut fur
Astronomie, Konigstuhl 17, 69117, Heidelberg,
Germany), AH(Max-Planck-Institut fur Astronomie,
Konigstuhl 17, 69117, Heidelberg, Germany),
AI(Apache Point Observatory PO Box 59, Sunspot,
NM 88349-0059, USA), AJ(Princeton University
Observatory, Princeton 08544, USA)
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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