Distinctive 21-cm structures of the first stars, galaxies and quasars
نویسندگان
چکیده
منابع مشابه
The First Stars and Quasars
The first star clusters and quasars resulted directly from the growth of linear density fluctuations in the early Universe. Since they emerged from a well-defined set of initial conditions, the interplay between observational data from the Next Generation Space Telescope (NGST) and theoretical modeling will advance the current understanding of star and quasar formation. The first objects had a ...
متن کاملFormation of the First Stars and Quasars
We examine various observable signatures of the first generation of stars and low–luminosity quasars, including the metal enrichment, radiation background, and dust opacity/emission that they produce. We calculate the formation history of collapsed baryonic halos, based on an extension of the Press–Schechter formalism, incorporating the effects of pressure and H2–dissociation. We then use the o...
متن کاملThe 21-cm signature of the first stars during the Lyman–Werner feedback era
The formation of the first stars is an exciting frontier area in astronomy. Early redshifts (z ∼ 20) have become observationally promising as a result of a recently recognized effect of a supersonic relative velocity between the dark matter and gas. This effect produces prominent structure on 100 comoving Mpc scales, which makes it much more feasible to detect 21-cm fluctuations from the epoch ...
متن کاملX-rays and hard ultraviolet radiation from the first galaxies: ionization bubbles and 21-cm observations
The first stars and quasars are known sources of hard ionizing radiation in the first billion years of the Universe. We examine the joint effects of X-rays and hard ultraviolet (UV) radiation from such first-light sources on the hydrogen and helium reionization of the intergalactic medium (IGM) at early times, and the associated heating. We study the growth and evolution of individual H II, He ...
متن کاملFormation of the First Stars and Galaxies
Observations made using large ground-based and space-borne telescopes have probed cosmic history all the way from the present-day to a time when the Universe was less than a tenth of its present age. Earlier on lies the remaining frontier, where the first stars, galaxies, and massive black holes formed. They fundamentally transformed the early Universe by endowing it with the first sources of l...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2014
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stu1982