2018A&A...612A..58N


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.17CET17:22:18

2018A&A...612A..58N - Astronomy and Astrophysics, volume 612A, 58-58 (2018/4-1)

Spotting high-z molecular absorbers using neutral carbon. Results from a complete spectroscopic survey with the VLT.

NOTERDAEME P., LEDOUX C., ZOU S., PETITJEAN P., SRIANAND R., BALASHEV S. and LOPEZ S.

Abstract (from CDS):

While molecular quasar absorption systems provide unique probes of the physical and chemical properties of the gas as well as original constraints on fundamental physics and cosmology, their detection remains challenging. Here we present the results from a complete survey for molecular gas in thirty-nine absorption systems selected solely upon the detection of neutral carbon lines in Sloan Digital Sky Survey (SDSS) spectra, without any prior knowledge of the atomic or molecular gas content. H2 is found in all twelve systems (including seven new detections) where the corresponding lines are covered by the instrument setups and measured to have logN(H2)≥18, indicating a self-shielded regime. We also report seven CO detections (7/39) down to logN(CO)∼13.5, including a new one, and put stringent constraints on N(CO) for the remaining 32 systems. N(CO) and N(CI) are found to be strongly correlated with N(CO)/N(CI)∼1/10. This suggests that the CI-selected absorber population is probing gas deeper than the HI-H2 transition in which a substantial fraction of the total hydrogen in the cloud is in the form of H2. We conclude that targeting CI-bearing absorbers is a very efficient way to find high-metallicity molecular absorbers. However, probing the molecular content in lower-metallicity regimes as well as high-column-density neutral gas remains to be undertaken to unravel the processes of gas conversion in normal high-z galaxies.

Abstract Copyright: © ESO 2018

Journal keyword(s): ISM: molecules - quasars: absorption lines

CDS comments: Table 1 J0820+1559 and J1522+0830 not identified (incomplete format)

Simbad objects: 38

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Number of rows : 38

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 2SLAQ J000052.27+001552.1 QSO 00 00 52.2757920139 +00 15 52.181607648           ~ 4 0
2 [VV2006] J021606.2-002104 QSO 02 16 06.1296719884 -00 21 04.981087937   19.05 18.78     ~ 30 0
3 [VV2006] J030049.3-072137 QSO 03 00 49.2410075531 -07 21 37.897130513   19.76 19.39     ~ 17 0
4 SDSS J081116.06+083837.6 QSO 08 11 16.0645115363 +08 38 37.695804447   19.34 18.97     ~ 9 0
5 [VV2006] J081540.6+264021 QSO 08 15 40.6039903465 +26 40 21.625511026   20.18 19.98     ~ 20 0
6 SDSS J085206.65+193548.4 QSO 08 52 06.6521878215 +19 35 48.455519253   19.49 19.18     ~ 11 0
7 [VV2006] J085437.6+031734 QSO 08 54 37.5956628687 +03 17 34.827992167   19.43 19.06     ~ 22 0
8 LB 8956 QSO 08 57 26.7928123389 +18 55 24.304264748   17.40 17.48     ~ 65 0
9 [VV2006] J091721.4+015448 QSO 09 17 21.3687393548 +01 54 48.125968526   20.91 20.43     ~ 20 0
10 2MASS J09275978+1543217 QSO 09 27 59.7858649207 +15 43 21.831677658   19.64 19.29     ~ 13 0
11 SDSS J104705.76+205734.5 QSO 10 47 05.7570986820 +20 57 34.506656628   20.26 19.92     ~ 15 0
12 SDSS J111756.52+143716.8 QSO 11 17 56.5245100664 +14 37 16.833025101   19.54 19.28     ~ 15 0
13 [VV2006] J112913.3-023741 QSO 11 29 13.2944811473 -02 37 41.031570837   19.55 19.23     ~ 22 0
14 [VV2006] J113341.2-005740 QSO 11 33 41.2893996940 -00 57 40.016255412   20.48 19.83     ~ 21 0
15 SDSS J121143.42+083349.7 QSO 12 11 43.4238496452 +08 33 49.681491390           ~ 12 0
16 SDSS J123714.61+064759.6 QSO 12 37 14.6101756939 +06 47 59.610269423   19.66 19.15     ~ 43 0
17 SDSS J124829.71+284858.1 QSO 12 48 29.7071124522 +28 48 58.164151965   19.32 19.11     ~ 11 0
18 SDSS J130225.28+211158.6 QSO 13 02 25.2805220278 +21 11 58.608479787   19.70 19.46     ~ 9 0
19 SDSS J130628.86+281550.7 QSO 13 06 28.8689584252 +28 15 50.810598479   20.02 19.61     ~ 9 0
20 SDSS J131129.11+222552.5 QSO 13 11 29.1081281214 +22 25 52.581313154   20.62 20.03     ~ 9 0
21 [VV2006] J131400.5+054319 QSO 13 14 00.5633576274 +05 43 19.510150567   19.25 19.00     ~ 19 0
22 PB 4045 QSO 13 41 22.5114954656 +18 52 13.875983687   17.50 17.29     ~ 14 0
23 SDSS J134601.10+064408.4 QSO 13 46 01.1045905293 +06 44 08.384387220   19.68 19.48     ~ 10 0
24 QSO J1439+1117 QSO 14 39 12.0427554986 +11 17 40.567315542   19.27 18.92     ~ 55 1
25 [VV2006] J145953.3+012944 QSO 14 59 53.2426065805 +01 29 44.253719676   20.17 19.76     ~ 18 0
26 SDSS J160320.76+170117.7 QSO 16 03 20.7637738744 +17 01 17.853872919   19.06 18.87     ~ 10 0
27 2MASS J16045749+2203007 QSO 16 04 57.5081984193 +22 03 00.512725927   19.84 19.49     ~ 20 0
28 SDSS J161526.65+264813.8 QSO 16 15 26.6442646747 +26 48 13.750129433   19.47 19.15     ~ 15 0
29 SDSS J162321.43+135532.4 QSO 16 23 21.4271995765 +13 55 32.430427797   19.66 19.44     ~ 11 0
30 [VV2006] J164610.2+232922 QSO 16 46 10.2000155966 +23 29 22.960978763   19.03 18.76     ~ 16 0
31 [VV2006] J170542.9+354340 QSO 17 05 42.9130634940 +35 43 40.318149900   19.44 19.12     ~ 27 0
32 QSO J2123-0050 QSO 21 23 29.4639237667 -00 50 52.916067995   16.91 16.62     ~ 77 0
33 [VV2006] J222910.1+141401 QSO 22 29 10.1628563751 +14 14 02.195634793   19.29 19.06     ~ 18 0
34 [VV2006] J225719.1-100105 QSO 22 57 19.0481122694 -10 01 04.685283892   18.85 18.57     ~ 19 0
35 [VV2006] J233156.5-090802 QSO 23 31 56.4744090376 -09 08 02.120356316   20.07 19.56     ~ 17 0
36 [VV2006] J233633.8-105841 QSO 23 36 33.8133084023 -10 58 41.574836942   19.30 19.01     ~ 18 0
37 QSO J2340-0053 QSO 23 40 23.6702895509 -00 53 26.997605159   18.26 17.93     ~ 74 0
38 QSO B2348-0108 QSO 23 50 57.8764286186 -00 52 09.892906411   19.23 18.77 18.7   ~ 128 0

    Equat.    Gal    SGal    Ecl

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2019.11.17-17:22:18

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