| Type |
Conference Paper |
| Names |
Yangsen Yao, J. M. Shull, C. W. Danforth, B. A. Keeney, J. Stocke, B. D. Savage, A. Narayanan |
| Proceedings Title |
Bulletin of the American Astronomical Society |
| Conference Name |
American Astronomical Society, AAS Meeting #215, #464.01 |
| Volume |
42 |
| Pages |
498 |
| Date |
January 1, 2010 |
| URL |
http://adsabs.harvard.edu/abs/2010AAS...21546401Y |
| Library Catalog |
NASA ADS |
| Abstract |
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. |