Effects of dust extinction on optical spectroscopic properties for starburst galaxies in di.pdfVIP
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Effects of dust extinction on optical spectroscopic properties for starburst galaxies in di
Effects of dust extinction on optical spectroscopic properties for
starburst galaxies in distant clusters
Yasuhiro Shioya
0 Astronomical Institute, Tohoku University, Sendai, 980-8578, Japan
0
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A Kenji Bekki
7
1 Division of Theoretical Astrophysics, National Astronomical Observatory, Mitaka, Tokyo,
1 181-8588, Japan
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2
6
2 Received ; accepted
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– 2 –
ABSTRACT
Recent observational studies on galaxies in distant clusters discovered a
significant fraction of possible dusty starburst galaxies with the so-called ‘e(a)’
spectra that are characterized by strong Hδ absorption and relatively modest
[OII] emission. We numerically investigate spectroscopic and photometric
evolution of dusty starburst galaxies in order to clarify the origin of the e(a)
spectra. We found that if a young starburst population is preferentially obscured
by dust than an old one in a dusty starburst galaxy, the galaxy shows e(a)
spectrum. It is therefore confirmed that the selective dust extinction, which
is first suggested by Poggianti Wu (2000) and means the strongest dust
extinction for the youngest stellar population among stellar populations with
different ages, is critically important to reproduce quantitatively the observed
e(a) spectra for the first time in the present numerical study. We furthermore
discuss what physical process is closely associated with this selective dust
extinction in cluster environment.
Subject headings: galaxies: clusters – galaxies:
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