Journal article
CARMA CO OBSERVATIONS OF THREE EXTREMELY METAL-POOR, STAR-FORMING GALAXIES
The Astrophysical journal, Vol.814(1), pp.1-9
11/20/2015
DOI: 10.1088/0004-637X/814/1/30
Abstract
ABSTRACT We present sensitive CO (J = 1 0) emission line observations of the three metal-poor dwarf irregular galaxies Leo P (Z ∼ 3% Z ), Sextans A (Z ∼ 7.5% Z ), and Sextans B (Z ∼ 7.5% Z ), all obtained with the Combined Array for Millimeter-wave Astronomy interferometer. While no CO emission was detected, the proximity of the three systems allows us to place very stringent (4 ) upper limits on the CO luminosity (LCO) in these metal-poor galaxies. We find the CO luminosities to be LCO < 2900 K km s−1 pc2 for Leo P, LCO < 12,400 K km s−1 pc2 for Sextans A, and LCO < 9700 K km s−1 pc2 for Sextans B. Comparison of our results with recent observational estimates of the factor for converting between LCO and the mass of molecular hydrogen, as well as theoretical models, provides further evidence that either the CO-to-H2 conversion factor increases sharply as metallicity decreases, or that stars are forming in these three galaxies very efficiently, requiring little molecular hydrogen.
Details
- Title: Subtitle
- CARMA CO OBSERVATIONS OF THREE EXTREMELY METAL-POOR, STAR-FORMING GALAXIES
- Creators
- Steven R. Warren - University of Maryland, College ParkEdward Molter - Macalester CollegeJohn M. Cannon - Macalester CollegeAlberto D. Bolatto - University of Maryland, College ParkElizabeth A. K. Adams - Netherlands Institute for Radio AstronomyElijah Z. Bernstein-Cooper - University of Wisconsin–MadisonRiccardo Giovanelli - Cornell UniversityMartha P. Haynes - Cornell UniversityRodrigo Herrera-Camus - University of Maryland, College ParkKatie Jameson - University of Maryland Department of Astronomy, College Park, MD 20742, , , USAKristen B. W. McQuinn - University of MinnesotaKatherine L. Rhode - Indiana University BloomingtonJohn J. Salzer - Indiana University BloomingtonEvan D. Skillman - University of Minnesota
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.814(1), pp.1-9
- DOI
- 10.1088/0004-637X/814/1/30
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Publisher
- The American Astronomical Society
- Number of pages
- 9
- Alternative title
- CARMA CO OBSERVATIONS OF THREE EXTREMELY METAL-POOR, STAR-FORMING GALAXIES
- Language
- English
- Date published
- 11/20/2015
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627254002771
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