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The discovery of eight z ~ 6 quasars from Pan-STARRS1

Published online by Cambridge University Press:  25 July 2014


E. Bañados
Affiliation:
Max Planck Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany email: banados@mpia.de
B. P. Venemans
Affiliation:
Max Planck Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany email: banados@mpia.de
E. Morganson
Affiliation:
Department of Physics, Harvard University, Cambridge, MA 02138, USA
R. Decarli
Affiliation:
Max Planck Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany email: banados@mpia.de
F. Walter
Affiliation:
Max Planck Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany email: banados@mpia.de
K. C. Chambers
Affiliation:
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu HI 96822
H-W. Rix
Affiliation:
Max Planck Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany email: banados@mpia.de
E. P. Farina
Affiliation:
Max Planck Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany email: banados@mpia.de
X. Fan
Affiliation:
Steward Observatory, The University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721–0065, USA
L. Jiang
Affiliation:
School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA
I. McGreer
Affiliation:
Steward Observatory, The University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721–0065, USA
G. De Rosa
Affiliation:
Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
R. Simcoe
Affiliation:
MIT-Kavli Center for Astrophysics and Space Research
A. Weiß
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69 D-53121 Bonn, Germany
P. A. Price
Affiliation:
Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA
J. S. Morgan
Affiliation:
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu HI 96822
W. S. Burgett
Affiliation:
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu HI 96822
J. Greiner
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse 1, 85748 Garching, Germany
N. Kaiser
Affiliation:
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu HI 96822
R.-P. Kudritzki
Affiliation:
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu HI 96822
E. A. Magnier
Affiliation:
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu HI 96822
N. Metcalfe
Affiliation:
Department of Physics, Durham University, South Road, Durham DH1 3LE, UK
C. W. Stubbs
Affiliation:
Department of Physics, Harvard University, Cambridge, MA 02138, USA
W. Sweeney
Affiliation:
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu HI 96822
J. L. Tonry
Affiliation:
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu HI 96822
R. J. Wainscoat
Affiliation:
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu HI 96822
C. Waters
Affiliation:
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu HI 96822
Corresponding
E-mail address:

Abstract

High-redshift quasars are unique probes of the evolution of supermassive black holes and the intergalactic medium at the end of the epoch of reionization. We present the optical spectra of eight new z ~ 6 quasars selected from the Panoramic Survey Telescope & Rapid Response System 1 (Pan-STARRS1). Details of the selection strategy can be found in Bañados et al. (2014). With this work we increase the number of known quasars at z < 5.7 by more than 10%. The quasars discovered here span a large range of luminosities (19.6 ≤ zP1 ≤ 21.2) and are remarkably heterogeneous in their spectral features: half of them show bright emission lines whereas the other half show weak or no Lyα emission line. We find a larger fraction of weak–line emission quasars than in lower redshift studies, although still based on low number statistics, this may imply that the quasar population could be more diverse than previously thought.


Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2014 

References

Bañados, E., Venemans, B. P, Morganson, E., et al. 2014, AJ, 148, 14CrossRefGoogle Scholar
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