Scattered Lyα Radiation around Sources before Cosmological Reionization
نویسندگان
چکیده
منابع مشابه
Scattered Lyα Radiation Around Sources Before Cosmological Reionization
The spectra of the first galaxies and quasars in the Universe should be strongly absorbed shortward of their rest-frame Lyα wavelength by neutral hydrogen (HI) in the intervening intergalactic medium. However, the Lyα line photons emitted by these sources are not eliminated but rather scatter until they redshift out of resonance and escape due to the Hubble expansion of the surrounding intergal...
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In Loeb & Rybicki (1999; paper I) it was shown that before reionization, the scattering of Lyα photons from a cosmological source might lead to a fairly compact (∼ 15) Lyα halo around the source. Observations of such halos could constrain the properties of the neutral intergalactic medium (IGM), and in particular yield the cosmological density parameters of baryons and matter on scales where th...
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The high-redshift Universe contains luminous Lyα emitting sources such as galaxies and quasars. The emitted Lyα radiation is often scattered by surrounding neutral hydrogen atoms. We show that the scattered Lyα radiation obtains a high level of polarization for a wide range of likely environments of high-redshift galaxies. For example, the back-scattered Lyα flux observed from galaxies surround...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1999
ISSN: 0004-637X,1538-4357
DOI: 10.1086/307844