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' |
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| container_title | Astrophysical journal. Letters |
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| creator | 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 |
| description | 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 ( |
| doi_str_mv | 10.1088/2041-8205/736/1/L22 |
| format | Article |
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M. ; Harrison, Fiona ; Jarrett, Thomas H. ; Madsen, Kristin ; Stanford, Spencer A. ; Wright, Edward L. ; Wu, Jingwen ; Wu, Yanling ; Yan, Lin</creator><creatorcontrib>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</creatorcontrib><description>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 <= 1/10 Z ). Their >300 A H Delta *b equivalent widths, similar to SBS 0335-052E, imply the existence of young (<5 Myr) star-forming regions. We measure star formation rates of 2.6 and 10.9 M yr--1 for W0801+26 and W1702+18, respectively. These BCDs, showing recent star formation activity in extremely low metallicity environments, provide new laboratories for studying star formation in extreme conditions and are low-redshift analogs of the first generation of galaxies to form in the universe. Using the all-sky WISE survey, we discuss a new method to identify similar star-forming, low-metallicity BCDs.</description><identifier>ISSN: 2041-8205</identifier><identifier>EISSN: 2041-8213</identifier><identifier>DOI: 10.1088/2041-8205/736/1/L22</identifier><language>eng</language><publisher>United States</publisher><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ; ELEMENTS ; GALAXIES ; GEOLOGIC SURVEYS ; GEOPHYSICAL SURVEYS ; INFRARED SURVEYS ; METALS ; RED SHIFT ; STARS</subject><ispartof>Astrophysical journal. 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M.</creatorcontrib><creatorcontrib>Harrison, Fiona</creatorcontrib><creatorcontrib>Jarrett, Thomas H.</creatorcontrib><creatorcontrib>Madsen, Kristin</creatorcontrib><creatorcontrib>Stanford, Spencer A.</creatorcontrib><creatorcontrib>Wright, Edward L.</creatorcontrib><creatorcontrib>Wu, Jingwen</creatorcontrib><creatorcontrib>Wu, Yanling</creatorcontrib><creatorcontrib>Yan, Lin</creatorcontrib><title>WISE DISCOVERY OF LOW-METALLICITY BLUE COMPACT DWARF GALAXIES</title><title>Astrophysical journal. Letters</title><description>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 <= 1/10 Z ). Their >300 A H Delta *b equivalent widths, similar to SBS 0335-052E, imply the existence of young (<5 Myr) star-forming regions. We measure star formation rates of 2.6 and 10.9 M yr--1 for W0801+26 and W1702+18, respectively. These BCDs, showing recent star formation activity in extremely low metallicity environments, provide new laboratories for studying star formation in extreme conditions and are low-redshift analogs of the first generation of galaxies to form in the universe. Using the all-sky WISE survey, we discuss a new method to identify similar star-forming, low-metallicity BCDs.</description><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</subject><subject>ELEMENTS</subject><subject>GALAXIES</subject><subject>GEOLOGIC SURVEYS</subject><subject>GEOPHYSICAL SURVEYS</subject><subject>INFRARED SURVEYS</subject><subject>METALS</subject><subject>RED SHIFT</subject><subject>STARS</subject><issn>2041-8205</issn><issn>2041-8213</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><recordid>eNo9kEFPgzAYhhujiXP6C7yQePCEtF8ptAcPyNgk6YLZ0LlTA12JmG1Myg7-eyFbPHx5v7x58h4ehO4JfiKYcw-wT1wOmHkhDTziSYALNDq3hF7-_5hdoxtrvzEGHBA-Qs-rdJk4k3QZZx_JYu1kU0dmK3ee5JGUaZzma-dFvidOnM3fojh3JqtoMXVmkYw-02R5i66qYmvN3TnHKJ8mefzqymyWxpF0NWV-54IPheZYFGVZQckIhJyRqvRDPyw3phCMMdBU9AcVYMJFIKqQBL4Ii41vDB2jh9NsY7taWV13Rn_pZr83ulNAWACMiJ56PFGHtvk5GtupXW212W6LvWmOVgnAHBPBaE_SE6nbxtrWVOrQ1rui_VUEq0GoGnSpQZfqhSqieqH0D-tNYOc</recordid><startdate>20110720</startdate><enddate>20110720</enddate><creator>Griffith, Roger L.</creator><creator>Tsai, Chao-Wei</creator><creator>Stern, Daniel</creator><creator>Blain, Andrew</creator><creator>Eisenhardt, Peter R. 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M.</creatorcontrib><creatorcontrib>Harrison, Fiona</creatorcontrib><creatorcontrib>Jarrett, Thomas H.</creatorcontrib><creatorcontrib>Madsen, Kristin</creatorcontrib><creatorcontrib>Stanford, Spencer A.</creatorcontrib><creatorcontrib>Wright, Edward L.</creatorcontrib><creatorcontrib>Wu, Jingwen</creatorcontrib><creatorcontrib>Wu, Yanling</creatorcontrib><creatorcontrib>Yan, Lin</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>OSTI.GOV</collection><jtitle>Astrophysical journal. Letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Griffith, Roger L.</au><au>Tsai, Chao-Wei</au><au>Stern, Daniel</au><au>Blain, Andrew</au><au>Eisenhardt, Peter R. M.</au><au>Harrison, Fiona</au><au>Jarrett, Thomas H.</au><au>Madsen, Kristin</au><au>Stanford, Spencer A.</au><au>Wright, Edward L.</au><au>Wu, Jingwen</au><au>Wu, Yanling</au><au>Yan, Lin</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>WISE DISCOVERY OF LOW-METALLICITY BLUE COMPACT DWARF GALAXIES</atitle><jtitle>Astrophysical journal. Letters</jtitle><date>2011-07-20</date><risdate>2011</risdate><volume>736</volume><issue>1</issue><spage>L22</spage><epage>jQuery1323916784098='48'</epage><pages>L22-jQuery1323916784098='48'</pages><issn>2041-8205</issn><eissn>2041-8213</eissn><abstract>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 <= 1/10 Z ). Their >300 A H Delta *b equivalent widths, similar to SBS 0335-052E, imply the existence of young (<5 Myr) star-forming regions. We measure star formation rates of 2.6 and 10.9 M yr--1 for W0801+26 and W1702+18, respectively. These BCDs, showing recent star formation activity in extremely low metallicity environments, provide new laboratories for studying star formation in extreme conditions and are low-redshift analogs of the first generation of galaxies to form in the universe. Using the all-sky WISE survey, we discuss a new method to identify similar star-forming, low-metallicity BCDs.</abstract><cop>United States</cop><doi>10.1088/2041-8205/736/1/L22</doi><oa>free_for_read</oa></addata></record> |
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| subjects | ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ELEMENTS GALAXIES GEOLOGIC SURVEYS GEOPHYSICAL SURVEYS INFRARED SURVEYS METALS RED SHIFT STARS |
| title | WISE DISCOVERY OF LOW-METALLICITY BLUE COMPACT DWARF GALAXIES |
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