High-Redshift Quasars Found in Sloan Digital Sky Survey Commissioning Data. VI. Sloan Digital Sky Survey Spectrograph Observations
| Autor: | Scott F. Anderson, Xiaohui Fan, Gordon T. Richards, Donald P. Schneider, Michael A. Strauss, Daniel E. Vanden Berk, James E. Gunn, Gillian R. Knapp, David Schlegel, Wolfgang Voges, Brian Yanny, Neta A. Bahcall, Mariangela Bernardi, J. Brinkmann, Robert Brunner, Istvan Csabái, Mamoru Doi, Masataka Fukugita, G. S. Hennessy, Željko Ivezić, Peter Z. Kunszt, Donald Q. Lamb, Jon Loveday, Robert H. Lupton, Timothy A. McKay, Jeffrey A. Munn, R. C. Nichol, G. P. Szokoly, Donald G. York |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Physics
Astrophysics::High Energy Astrophysical Phenomena media_common.quotation_subject Astrophysics (astro-ph) Astrophysics::Instrumentation and Methods for Astrophysics FOS: Physical sciences Astronomy and Astrophysics Quasar Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Redshift law.invention Telescope Space and Planetary Science Observatory law Sky Emission spectrum Spectral resolution Spectrograph Astrophysics::Galaxy Astrophysics media_common |
| Zdroj: | The Astronomical Journal. 122:503-517 |
| ISSN: | 0004-6256 |
| DOI: | 10.1086/321168 |
| Popis: | We present results on over 100 high-redshift quasars found in the Sloan Digital Sky Survey (SDSS), using automated selection algorithms applied to SDSS imaging data and with spectroscopic confirmation obtained during routine spectroscopic operations of the Sloan 2.5-m telescope. The SDSS spectra cover the wavelength range 3900--9200 Angstroms at a spectral resolution of 1800, and have been obtained for 116 quasars with redshifts greater than 3.94; 92 of these objects were previously uncataloged, significantly increasing the current tally of published z>4 quasars. The paper also reports observations of five additional new z>4.6 quasars; all were found from the SDSS imaging survey and spectroscopically confirmed with data from the Apache Point Observatory's 3.5-m telescope. The i' magnitudes of the quasars range from 18.03 to 20.56. Of the 97 new objects in this paper, 13 are Broad Absorption Line quasars. Five quasars, including one object at a redshift of 5.11, have 20 cm peak flux densities greater than 1 mJy. Two of the quasars, both at z=4.5, have very weak emission lines; one of these objects is a radio source. Nineteen of the newly-discovered objects have redshifts above 4.6, and the maximum redshift is z=5.41; among objects reported to date, the latter is the third highest redshift AGN, and penultimate in redshift among luminous quasars. 34 pages, 7 figures, submitted to AJ |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|