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CHARACTERIZING THE CIRCUMGALACTIC MEDIUM OF NEARBY GALAXIES WITHHST/COS ANDHST/STIS ABSORPTION-LINE SPECTROSCOPY
- Source :
- The Astrophysical Journal. 763:148
- Publication Year :
- 2013
- Publisher :
- American Astronomical Society, 2013.
-
Abstract
- The Circumgalactic Medium (CGM) of late-type galaxies is characterized using UV spectroscopy of 11 targeted QSO/galaxy pairs at z < 0.02 with the Hubble Space Telescope Cosmic Origins Spectrograph and ~60 serendipitous absorber/galaxy pairs at z < 0.2 with the Space Telescope Imaging Spectrograph. CGM warm cloud properties are derived, including volume filling factors of 3-5%, cloud sizes of 0.1-30 kpc, masses of 10-1e8 solar masses and metallicities of 0.1-1 times solar. Almost all warm CGM clouds within 0.5 virial radii are metal-bearing and many have velocities consistent with being bound, "galactic fountain" clouds. For galaxies with L > 0.1 L*, the total mass in these warm CGM clouds approaches 1e10 solar masses, ~10-15% of the total baryons in massive spirals and comparable to the baryons in their parent galaxy disks. This leaves >50% of massive spiral-galaxy baryons "missing". Dwarfs (1e11 solar masses). While the warm CGM clouds cannot account for all the "missing baryons" in spirals, the hot intra-group gas can, and could account for ~20% of the cosmic baryon census at z ~ 0 if this hot gas is ubiquitous among spiral groups.<br />34 pages, 14 figures, 8 tables; accepted for publication in ApJ
- Subjects :
- Physics
Solar mass
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
COSMIC cancer database
010308 nuclear & particles physics
FOS: Physical sciences
Astronomy and Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
01 natural sciences
Galaxy
Spectral line
Baryon
13. Climate action
Space and Planetary Science
0103 physical sciences
Astrophysics::Earth and Planetary Astrophysics
Spectroscopy
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
Spiral
Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- ISSN :
- 15384357 and 0004637X
- Volume :
- 763
- Database :
- OpenAIRE
- Journal :
- The Astrophysical Journal
- Accession number :
- edsair.doi.dedup.....6b0c6eb131f3aec77f226e34e7dfca72