Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.3206k&link_type=abstract
American Astronomical Society Meeting 210, #32.06; Bulletin of the American Astronomical Society, Vol. 39, p.144
Astronomy and Astrophysics
Astronomy
Scientific paper
We describe the results of a narrow band search for strong emission line galaxies (EW(Hβ) > 30 A) at intermediate redshifts (z < 1). 542 candidate galaxies are found in a half square degree survey using two 100 A filters centered at 8150A and 9140A with Subaru/SuprimeCam. Followup spectroscopy with the KeckII/DEIMOS has shown that they consist of [OIII]5007, [OII]3727, Hα selected strong emission line galaxies at intermediate redshifts (z < 1), and Lyα emitting galaxies at high-redshift (z >> 5). In the present talk, we focus on emission line galaxies at z < 1. The Hβ luminosity functions and the star formation density of such galaxies are 5-10% of the values fuond from UV continuum objects at z = 0 - 1, suggesting that they are common at z < 1. Many of these galaxies show the temperature sensitive [OIII]4363 auroral lines, suggesting their low metal content. Indeed, a dozen of them satisfy the criteria of eXtrmely Metal Poor Galaxies (XMPGs) and they may be the most distant XMPGs known today. Our high yield rate of XMPGs suggests that narrowband method is powerful in finding such populations. Moreover, the lowest metallicity measured in our sample is close to the minimum metallicity found in local galaxies such as I Zw 18. The luminosities, metallicities, and star formation rates of these galaxies are consistent with the strong emitters being start-up intermediate mass galaxies which will evolve into more normal galaxies and suggest that galaxies are still forming in relatively chemically pristine sites at z < 1.
Cowie Lennox L.
Hu Esther M.
Kakazu Yuko
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