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The CGM 2 Survey: Circumgalactic O vi from Dwarf to Massive Star-forming Galaxies.
- Source :
-
Astrophysical Journal . 3/8/2022, Vol. 927 Issue 2, p1-19. 19p. - Publication Year :
- 2022
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Abstract
- We combine 126 new galaxy-O vi absorber pairs from the CGM2 survey with 123 pairs drawn from the literature to examine the simultaneous dependence of the column density of O vi absorbers (N O VI) on galaxy stellar mass, star-formation rate, and impact parameter. The combined sample consists of 249 galaxy-O vi absorber pairs covering z = 0â€"0.6, with host galaxy stellar masses M * = 107.8â€"1011.2 M ⊙ and galaxy-absorber impact parameters R ⊥ = 0â€"400 proper kiloparsecs. In this work, we focus on the variation of N O VI with galaxy mass and impact parameter among the star-forming galaxies in the sample. We find that the average N O VI within one virial radius of a star-forming galaxy is greatest for star-forming galaxies with M * = 109.2â€"1010 M ⊙. Star-forming galaxies with M * between 108 and 1011.2 M ⊙ can explain most O vi systems with column densities greater than 1013.5 cmâ'2. Sixty percent of the O vi mass associated with a star-forming galaxy is found within one virial radius, and 35% is found between one and two virial radii. In general, we find that some departure from hydrostatic equilibrium in the CGM is necessary to reproduce the observed O vi amount, galaxy mass dependence, and extent. Our measurements serve as a test set for CGM models over a broad range of host galaxy masses. [ABSTRACT FROM AUTHOR]
- Subjects :
- *STELLAR mass
*DWARF galaxies
*GALAXIES
*HYDROSTATIC equilibrium
*STAR formation
Subjects
Details
- Language :
- English
- ISSN :
- 0004637X
- Volume :
- 927
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Astrophysical Journal
- Publication Type :
- Academic Journal
- Accession number :
- 155760680
- Full Text :
- https://doi.org/10.3847/1538-4357/ac450c