2018A&A...616A.158Z


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.21CEST08:33:11

2018A&A...616A.158Z - Astronomy and Astrophysics, volume 616A, 158-158 (2018/8-1)

Near-infrared spectroscopic observations of high redshift C I absorbers.

ZOU S., PETITJEAN P., NOTERDAEME P., LEDOUX C., KROGAGER J.-K., FATHIVAVSARI H., SRIANAND R. and LOPEZ S.

Abstract (from CDS):

We study a sample of 17 z>1.5 absorbers selected based on the presence of strong CI absorption lines in Sloan Digital Sky Survey (SDSS) spectra and observed with the European Southern Observatory Very Large Telescope (ESO-VLT) spectrograph X-shooter. We derive metallicities, depletion onto dust, and extinction by dust, and analyse the absorption from MgII, MgI, CaII, and NaI that are redshifted into the near infrared wavelength range. We show that most of these CI absorbers have high metallicity and dust content. We detect nine CaII absorptions with W(CaIIλ3934)>0.23Å out of 14 systems where we have appropriate wavelength coverage. The observed equivalent widths are similar to what has been measured in other lower redshift surveys of CaII systems. We detect ten NaI absorptions in the 11 systems where we could observe this absorption. The median equivalent width (W(NaIλ5891)=0.68Å) is larger than what is observed in local clouds with similar HI column densities but also in z<0.7 CaII systems detected in the SDSS. The systematic presence of NaI absorption in these CI systems strongly suggests that the gas is neutral and cold, maybe part of the diffuse molecular gas in the interstellar medium of high-redshift galaxies. Most of the systems (12 out of 17) have W(MgIIλ2796)>2.5Å and six of them have log N(HI)<20.3, with the extreme case of J1341+1852 that has log N(HI)=18.18. The MgII absorptions are spread over more than Δυ∼400km/s for half of the systems; three absorbers have Δυ>500km/s. The kinematics are strongly perturbed for most of these systems, which indicates that these systems probably do not arise in quiet disks and must be close to regions with intense star-formation activity and/or are part of interacting objects. All this suggests that a large fraction of the cold gas at high redshift arises in disturbed environments.

Abstract Copyright: © ESO 2018

Journal keyword(s): infrared: galaxies - methods: observational - techniques: spectroscopic - Galaxy: abundances - galaxies: kinematics and dynamics

VizieR on-line data: <Available at CDS (J/A+A/616/A158): ci-xhs.dat sp/*>

Simbad objects: 22

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Number of rows : 22

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9091 1
2 [VV2006] J021606.2-002104 QSO 02 16 06.1296719884 -00 21 04.981087937   19.05 18.78     ~ 30 0
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5375 1
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14325 1
5 QSO J0747+3054 QSO 07 47 07.6290098530 +30 54 14.973035788   18.96 18.63     ~ 21 0
6 [VV2006] J081540.6+264021 QSO 08 15 40.6039903465 +26 40 21.625511026   20.18 19.98     ~ 20 0
7 QSO J0831+5245 QSO 08 31 41.7095363198 +52 45 17.620340544   19.2   14.5 13.9 ~ 472 1
8 [VV2006] J085437.6+031734 QSO 08 54 37.5956628687 +03 17 34.827992167   19.43 19.06     ~ 22 0
9 [VV2006] J091721.4+015448 QSO 09 17 21.3687393548 +01 54 48.125968526   20.91 20.43     ~ 20 0
10 SDSS J104705.76+205734.5 QSO 10 47 05.7570986820 +20 57 34.506656628   20.26 19.92     ~ 15 0
11 A1 9 QSO 11 22 50.9521149510 +14 37 32.469634331   17.91 17.71     ~ 22 0
12 [VV2006] J113341.2-005740 QSO 11 33 41.2893996940 -00 57 40.016255412   20.48 19.83     ~ 21 0
13 SDSS J123714.61+064759.6 QSO 12 37 14.6101756939 +06 47 59.610269423   19.66 19.15     ~ 43 0
14 SDSS J124829.71+284858.1 QSO 12 48 29.7071124522 +28 48 58.164151965   19.32 19.11     ~ 11 0
15 SDSS J130225.28+211158.6 QSO 13 02 25.2805220278 +21 11 58.608479787   19.70 19.46     ~ 9 0
16 [VV2006] J131400.5+054319 QSO 13 14 00.5633576274 +05 43 19.510150567   19.25 19.00     ~ 19 0
17 PB 4045 QSO 13 41 22.5114954656 +18 52 13.875983687   17.50 17.29     ~ 14 0
18 SDSS J134601.10+064408.4 QSO 13 46 01.1045905293 +06 44 08.384387220   19.68 19.48     ~ 10 0
19 QSO B1415+0129 QSO 14 17 51.8477866686 +01 15 56.216305651   18.83 18.61     ~ 21 0
20 [VV2006] J222910.1+141401 QSO 22 29 10.1628563751 +14 14 02.195634793   19.29 19.06     ~ 18 0
21 [VV2006] J233633.8-105841 QSO 23 36 33.8133084023 -10 58 41.574836942   19.30 19.01     ~ 18 0
22 QSO J2340-0053 QSO 23 40 23.6702895509 -00 53 26.997605159   18.26 17.93     ~ 74 0

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2019.10.21-08:33:11

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