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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 198474.0, MPI für Astronomie / Publikationen_mpia
Discovery of eight new extremely metal poor
galaxies in the Sloan Digital Sky Survey
Authors:Kniazev, Alexei Y.; Grebel, Eva K.; Hao, Lei; Strauss, Michael A.; Brinkmann, Jonathan; Fukugita, Masataka
Date of Publication (YYYY-MM-DD):2003
Title of Journal:The Astrophysical Journal
Journal Abbrev.:The Astrophysical Journal
Volume:593
Start Page:L73
End Page:L76
Sequence Number of Article:2003ApJ...593L..73K
Review Status:not specified
Audience:Experts Only
Abstract / Description:We report the discovery of eight new extremely
metal poor galaxies [XMPGs;
12+log(O/H) lt;7.65] and the recovery of four
previously known or suspected XMPGs (I Zw 18, HS
0822+3542, HS 0837+4717, and A1116+517) using
Sloan Digital Sky Survey (SDSS) spectroscopy.
These new objects were identified after an
analysis of 250,000 galaxy spectra within an
area of ~3000 deg2 on the sky. Our
oxygen abundance determinations have an accuracy
of lt;=0.1 dex and are based on the
temperature-sensitive [O III] lambda;4363 line
and on the direct calculation of the electron
temperature. We briefly discuss a new method of
oxygen abundance determinations using the [O II]
lambda; lambda;7319, 7330 lines that is
particularly useful for SDSS emission-line
spectra with redshifts lt;=0.024 since the [O
II] lambda;3727 emission line falls outside of
the SDSS wavelength range. We detect XMPGs with
redshifts ranging from 0.0005 to 0.0443 and
Mg luminosities from -12.4 to -18.6
mag. Our eight new XMPGs increase the number of
known metal-deficient galaxies by approximately
one-quarter. The estimated surface density of
XMPGs is 0.004 deg-2 for r lt;=17.77
mag.
Free Keywords:Galaxies: Abundances; Galaxies: Dwarf; Galaxies: Evolution
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:Koenigstuhl 17, D-69117 Heidelberg, Germany;
<EMAIL>kniazev@mpia.de</EMAIL>,
<EMAIL>grebel@mpia.de</EMAIL>.; Special
Astrophysical Observatory, Russian Academy of
Sciences, St. Zelenchukskaya, Nizhnij Arkhyz,
Karachai-Circessia 369167, Russia.),
AB(Max-Planck-Institut f uuml;r Astronomie,
K ouml;nigstuhl 17, D-69117 Heidelberg, Germany;
<EMAIL>kniazev@mpia.de</EMAIL>,
<EMAIL>grebel@mpia.de</EMAIL>.), AC(Princeton
University Observatory, Peyton Hall, Princeton,
NJ 08544-1001
<EMAIL>haol@astro.princeton.edu</EMAIL>,
<EMAIL>strauss@astro.princeton.edu</EMAIL>.),
AD(Special Astrophysical Observatory, Russian
Academy of Sciences, St. Zelenchukskaya, Nizhnij
Arkhyz, Karachai-Circessia 369167, Russia.),
AE(Apache Point Observatory, P.O. Box 59,
Sunspot, NM 88349;
<EMAIL>jb@apo.nmsu.edu</EMAIL>.), AF(Institute
for Cosmic Ray Research, University of Tokyo,
5-1-5 Kashiwa, Kashiwa City, Chiba 277-8582,
Japan;
<EMAIL>fukugita@icrr.u-tokyo.ac.jp</EMAIL>.)
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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