Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21546401y&link_type=abstract
American Astronomical Society, AAS Meeting #215, #464.01; Bulletin of the American Astronomical Society, Vol. 42, p.498
Astronomy and Astrophysics
Astronomy
Scientific paper
The tenuous warm-hot intergalactic medium (WHIM) at temperatures of 105--107 K is believed to contain a significant amount of baryonic matter in the local universe. But its properties (for instance, density, temperature, and ionization stage) are still poorly understood. With the unprecedented detection sensitivity and broad coverage in far-ultraviolet and near-ultraviolet wavelengths, the Cosmic Origins (COS) Spectrograph aboard Hubble Space Telescope now allows us to detect absorption lines of Ne VIII, O VI, N V, and C IV, as well as low ionization ions produced in the WHIM at the same time. It thus offers us a unique opportunity to probe the WHIM properties via powerful diagnostic of spectroscopy. We herein present a hybrid model that accounts for both photoionization and collisional ionization in the WHIM and utilizes the diagnostic power of multiple absorption lines to constrain the WHIM properties. We apply this model to several WHIM absorbers where the COS observations are available.
Danforth Charles W.
Keeney Brian A.
Narayanan Anand
Savage Blair. D.
Shull Michael J.
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