Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21920103t&link_type=abstract
American Astronomical Society, AAS Meeting #219, #201.03
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the results of a systematic search for mid-IR bright, low-metallicity blue compact dwarf galaxies (BCDs) using the WISE all-sky survey. WISE-selected BCDs have extremely hot dust, making them much redder than known optically-selected BCDs, and they have similar mid-infrared colors to obscured AGNs and red ULIRGs between 3.4 and 12 microns. Optical spectroscopic follow-up shows that the majority of WISE-selected BCDs have metallicities significantly lower than known BCD populations. Their > 100 Angstrom H-beta equivalent widths, similar to SBS 0335-052E, imply the existence of young (<5 Myr) star-forming regions. Despite their strong mid-infrared emission, WISE-selected BCDs show very low optical extinction, and thus provide a useful sample of transparent systems for detailed studies at optical through near-infrared wavelengths. These BCDs, showing recent star formation activity in extremely low metallicity environments, are likely low-redshift analogs to the first generation of galaxies to form in the universe.
Assef Roberto
Benford Dominic
Blain Andrew
Bridge Carrie
Eisenhardt Peter
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