Thermal State of the Intergalactic Medium at z ∼ 2–4
نویسندگان
چکیده
منابع مشابه
The thermal history of the intergalactic medium
At redshifts z2, most of the baryons reside in the smooth intergalactic medium which is responsible for the low column density Lyα forest. This photoheated gas follows a tight temperature-density relation which introduces a cut-off in the distribution of widths of the Lyα absorption lines (b-parameters) as a function of column density. We have measured this cut-off in a sample of nine high reso...
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We present a new constraint on the amount of dust in the intergalactic medium (IGM) at high redshift. We derive the thermal history of the IGM by taking account of the photoelectric heating by dust grains, and compare it with the thermal history suggested by observations of Lyman α forests. As a result, if the IGM grain size is & 100 Å, the dust-gas mass ratio of the IGM at z & 2 is . 1/100 Gal...
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We have identified a large-scale structure traced by galaxies at z=0.8, within the Lockman Hole, by means of multi-object spectroscopic observations. By using deep XMM images we have investigated the soft X-ray emission from the Warm-Hot Intergalactic Medium (WHIM) expected to be associated with this large-scale structure and we set a tight upper limit to its flux in the very soft 0.2–0.4 keV b...
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Studies of quasar absorption lines reveal that the low density intergalactic medium at z ∼ 3 is enriched to 10−10 solar metallicity. This enrichment may have occurred in an early generation of Population III stars at redshift z ∼> 10, by protogalaxies at 6 ∼< z ∼< 10, or by larger galaxies at 3 ∼< z ∼< 6. This paper addresses the third possiblity by calculating the enrichment of the IGM at z ∼>...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2019
ISSN: 1538-4357
DOI: 10.3847/1538-4357/ab52fe