2019MNRAS.484.5028M


Query : 2019MNRAS.484.5028M

2019MNRAS.484.5028M - Mon. Not. R. Astron. Soc., 484, 5028-5048 (2019/April-3)

Physical conditions in high-z optically thin C III absorbers: origin of cloud sizes and associated correlations.

MOHAPATRA A., SRIANAND R., KHAIRE V. and PRADHAN A.C.

Abstract (from CDS):

We present detailed photoionization models of well-aligned optically thin C III absorption components at 2.1 < z < 3.4. Using our models we estimate density (nH), metallicity ([C/H]), total hydrogen column density, and line-of-sight thickness (L) in each C III components. We estimate the systematic errors in these quantities contributed by the allowed range of the quasar spectral index used in the ultraviolet background radiation calculations. Our inferred nH and overdensity (Δ) are much higher than the measurements available in the literature and favour the absorption originating from gas associated with circumgalactic medium (CGM) and probably not in hydrostatic equilibrium. We also notice nH, L, and [C/H] associated with C III components show statistically significant redshift evolution. To some extent, these redshift evolutions are driven by the appearance of compact, high nH, and high [C/H] components only in the low-z end. We find more than 5σ level correlation between [C/H] and L, L and neutral hydrogen column density (N( H I)), N( H I), and [C/H]. We show L versus [C/H] correlation can be well reproduced if L is governed by the product of gas cooling time and sound speed as expected in the case of cloud fragmentation under thermal instabilities. This allows us to explain other observed correlations by simple photoionization considerations. Studying the optically thin C III absorbers over a large z range and probably correlating their z evolution with global star formation rate density evolution can shed light into the physics of cold clump formation and their evolution in the CGM.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: evolution - galaxies: haloes - quasars: absorption lines

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 QSO B0002-422 QSO 00 04 48.2718823544 -41 57 28.150311306   17.44 17.21     ~ 156 0
2 QSO B0055-26 QSO 00 57 58.0249885733 -26 43 14.753717865   17.90 17.47 17.99   ~ 138 1
3 QSO J0153-4311 QSO 01 53 27.1919509912 -43 11 38.096734050     16.80     ~ 46 0
4 QSO B0329-385 QSO 03 31 06.3780192488 -38 24 04.653743031   17.63 16.92     ~ 76 0
5 PHL 4444 QSO 03 31 08.9205312901 -25 24 43.264751845   17.82 17.51 18.2   ~ 96 1
6 QSO J0422-3844 BLL 04 22 14.7829518039 -38 44 52.824921025   17.70 16.92 16.3   ~ 192 1
7 QSO J0455-4216 QSO 04 55 23.0623318803 -42 16 17.398158654   17.77 17.06     ~ 134 0
8 QSO B0940-1050 QSO 09 42 53.5076745009 -11 04 25.929146122   16.96 16.6 16.6   ~ 89 0
9 2MASS J13503888-2512167 QSO 13 50 38.8796359626 -25 12 16.857082711           ~ 8 0
10 QSO B2126-15 QSO 21 29 12.17589777 -15 38 41.0413097   17.61 17.3 17.3   ~ 475 1
11 QSO B2347-4342 QSO 23 50 34.2595236845 -43 25 59.680334378   16.3 16.3     ~ 161 0

    Equat.    Gal    SGal    Ecl

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2021.07.26-05:43:57

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