Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733517x&link_type=abstract
American Astronomical Society, AAS Meeting #217, #335.17; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the M-Z (mass-metallicity) relation for 30 star-forming galaxies at 0.2 < z < 0.8 in HST/ACS PEARS by the Magellan LDSS-3 spectroscopy. The M-Z relation of the PEARS galaxies shows large offset by -0.5 dex in metallicity at given stellar mass relative to the local M-Z relation from SDSS galaxies. The L-Z relation is offset by -0.8 dex in metallicity for a given rest-frame B absolute magnitude relative to the local L-Z relation. The low metallicity galaxies in the PEARS sample show very blue colors, small sizes, and compact disturbed morphologies, and are similar to the studied local LBG analogs and "green peas” with SSFR > 10-9 yr-1. After excluding the highly disturbed and elongated galaxies, the gas-phase oxygen abundance shows a positive relation with the galaxy sizes, which is linearly fitted as 12 + log(O/H) = 0.09 (dex/kpc) rhlr + 8.13. From the physical properties of the low metallicity PEARS galaxies, blue colors, compact disturbed morphologies, high SSFRs, the tidal interacting induced inflow of metal-poor gas may account for the low metallicities of these galaxies and the large offset of the PEARS galaxies in the L-Z and the M-Z relations relative to the local relations.
Support for program was provided by NASA through a grant from the STSI, which is operated by the AURA under NASA contract NASA5-26555 and is supported by HST grant 10530.
Malhotra Sagar
Rhoads James
Xia Lifang
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