WISE DISCOVERY OF LOW-METALLICITY BLUE COMPACT DWARF GALAXIES

WISE DISCOVERY OF LOW-METALLICITY BLUE COMPACT DWARF GALAXIES

We report two new low-metallicity blue compact dwarf galaxies (BCDs), WISEP J080103.93+264053.9 (hereafter W0801+26) and WISEP J170233.53+180306.4 (hereafter W1702+18), discovered using the Wide-field Infrared Survey Explorer (WISE). We identified these two BCDs from their extremely red colors at mi...

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Veröffentlicht in:Astrophysical journal. Letters 2011-07, Vol.736 (1), p.L22-jQuery1323916784098='48'
Hauptverfasser: Griffith, Roger L., Tsai, Chao-Wei, Stern, Daniel, Blain, Andrew, Eisenhardt, Peter R. M., Harrison, Fiona, Jarrett, Thomas H., Madsen, Kristin, Stanford, Spencer A., Wright, Edward L., Wu, Jingwen, Wu, Yanling, Yan, Lin
Format: Artikel
Sprache:eng
Schlagworte:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
ELEMENTS
GALAXIES
GEOLOGIC SURVEYS
GEOPHYSICAL SURVEYS
INFRARED SURVEYS
METALS
RED SHIFT
STARS
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Zusammenfassung:We report two new low-metallicity blue compact dwarf galaxies (BCDs), WISEP J080103.93+264053.9 (hereafter W0801+26) and WISEP J170233.53+180306.4 (hereafter W1702+18), discovered using the Wide-field Infrared Survey Explorer (WISE). We identified these two BCDs from their extremely red colors at mid-infrared wavelengths and obtained follow-up optical spectroscopy using the Low Resolution Imaging Spectrometer on Keck I. The mid-infrared properties of these two sources are similar to the well-studied, extremely low metallicity galaxy SBS 0335-052E. We determine metallicities of 12 + log (O/H) = 7.75 and 7.63 for W0801+26 and W1702+18, respectively, placing them among a very small group of very metal deficient galaxies (Z 300 A H Delta *b equivalent widths, similar to SBS 0335-052E, imply the existence of young (
ISSN:2041-8205
2041-8213
DOI:10.1088/2041-8205/736/1/L22