Non-Equilibrium Ionization State of a Warm-Hot Intergalactic Medium
نویسندگان
چکیده
منابع مشابه
Non-equilibrium Ionization State of Warm–hot Intergalactic Medium
Time evolution of the ionization state of metals in the cosmic baryons is investigated in a cosmological context without the assumption of ionization equilibrium. We find that a significant fraction of ionized oxygen (Ovii and Oviii) in the warm-hot intergalactic medium (WHIM) is not in the ionization equilibrium state at a redshift of z≃ 0. We also investigate the effect on the detectability a...
متن کاملBaryons in the Warm-hot Intergalactic Medium
Approximately 30− 40% of all baryons in the present day universe reside in a warm-hot intergalactic medium (WHIM), with temperatures between 10 < T < 10 K. This is a generic prediction from six hydrodynamic simulations of currently favored structure formation models having a wide variety of numerical methods, input physics, volumes, and spatial resolutions. Most of these warm-hot baryons reside...
متن کاملA Warm Hot Intergalactic Medium towards 3c 120?
We observed the Seyfert I active galaxy/broad line radio galaxy 3C 120 with the Chandra high energy transmission gratings and present an analysis of the soft X-ray spectrum. We identify the strongest absorption feature (detected at > 99.9% confidence) with O VIII Lyα (FWHM = 1010+295 −265 km s −1), blueshifted by −5500± 140 km s−1 from systemic velocity. The absorption may be due to missing bar...
متن کاملObservations of the Warm - Hot Intergalactic Medium towards PG
We use Far Ultraviolet Spectroscopic Explorer (FUSE) and Space Telescope Imaging Spectrograph (STIS) spectra to study intergalactic absorption towards the quasar PG1259+593 (zem = 0.478), with a particular emphasis on the warm-hot intergalactic medium (WHIM). The combined FUSE and STIS spectrum of PG1259+593 covers the full wavelength range between 905 and 1730 Å at a spectral resolution of∼ 25...
متن کاملThe Temperature Structure of the Warm-hot Intergalactic Medium
We study the temperature structure of the intergalactic medium (IGM) using a large cosmological N -body/SPH simulation. We employ a two-temperature model for the thermal evolution of the ionized gas, in which the relaxation process between electrons and ions is explicitly included. In the diffuse, hot IGM, the relaxation time is comparable to the age of the Universe and hence the electron tempe...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Publications of the Astronomical Society of Japan
سال: 2006
ISSN: 0004-6264,2053-051X
DOI: 10.1093/pasj/58.4.641