A High Resolution Investigation of 21 cm Absorption Spectra
نویسندگان
چکیده
منابع مشابه
Weak Gravitational Lensing of High-redshift 21 Cm Power Spectra
We describe the effects of weak gravitational lensing by cosmological large scale structure on the diffuse emission of 21 centimeter radiation from neutral hydrogen at high redshifts during the era of reionization. The ability to observe radial information through the frequency, and thus threedimensional regions of the background radiation at different redshifts, suggests that 21 cm studies may...
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We study the absorption along lines of sight toward high-z radio sources caused by the 21 cm transition of neutral hydrogen in the intergalactic medium (IGM) before reionization. Using semi-analytic methods, we compute the number density of observable features caused by both “minihalos” (bound objects that are unable to cool efficiently because of their small virial temperatures) and protogalac...
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High resolution 21 cm mapping of the Ursa Major Galactic cirrus: power spectra of the high-latitude Hi gas. Abstract. We present a power spectrum analysis of interferometric 21 cm observations of the Ursa Major high-latitude cirrus, obtained with the Dominion Radio Astrophysical Observatory (DRAO) of Penticton (Canada). These high-resolution data reveal the intricate structure of the diffuse Ga...
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We study the absorption along lines of sight toward high-z radio sources caused by the 21 cm transition of neutral hydrogen in the intergalactic medium (IGM) before reionization. Using semi-analytic methods, we compute the number density of observable features caused by both “minihalos” (bound objects that are unable to cool efficiently because of their small virial temperatures) and protogalac...
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We present deep GMRT 21cm absorption spectra of 10 damped Lyman-α systems (DLAs), of which 8 are at redshifts z >∼ 1.3. HI absorption was detected in only one DLA, the z = 0.5318 absorber toward PKS 1629+12. This absorber has been identified with a luminous spiral galaxy; the spin temperature limit (Ts ≤ 310 K) derived from our observations continues the trend of DLAs associated with bright spi...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1964
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/127.5.387