2019A&A...627A..32N


Query : 2019A&A...627A..32N

2019A&A...627A..32N - Astronomy and Astrophysics, volume 627A, 32-32 (2019/7-1)

Proximate molecular quasar absorbers. Excess of damped H2 systems at zabs~=zQSO in SDSS DR14.

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

Abstract (from CDS):

We present results from a search for strong H2 absorption systems proximate to quasars (zabs~=zem) in the Sloan Digital Sky Survey (SDSS) Data Release 14. The search is based on the Lyman-Werner band signature of damped H2 absorption lines without any prior on the associated metal or neutral hydrogen content. This has resulted in the detection of 81 systems with N(H2)∼1019-1020cm–2 located within a few thousand km/s from the quasar. Compared to a control sample of intervening systems, this implies an excess of proximate H2 systems by about a factor of 4 to 5. The incidence of H2 systems increases steeply with decreasing relative velocity, reaching an order of magnitude higher than expected from intervening statistics at Δv<1000km/s. The most striking feature of the proximate systems compared to the intervening ones is the presence of Lyα emission in the core of the associated damped HI absorption line in about half of the sample. This puts constraints on the relative projected sizes of the absorbing clouds to those of the quasar line emitting regions. Using the SDSS spectra, we estimate the HI, metal and dust content of the systems, which are found to have typical metallicities of one tenth Solar, albeit with a large spread among individual systems. We observe trends between the fraction of leaking Lyα emission and the relative absorber-quasar velocity as well as with the excitation of several metal species, similar to what has been seen in metal-selected proximate DLAs. With the help of theoretical HI-H2 transition relations, we show that the presence of H2 helps to break the degeneracy between density and strength of the UV field as main sources of excitation and hence provides unique constraints on the possible origin and location of the absorbing clouds. We suggest that most of these systems originate from galaxies in the quasar group, although a small fraction of them could be located in the quasar host as well. We conclude that follow-up observations are still required to investigate the chemical and physical conditions in individual clouds and to assess the importance of AGN feedback for the formation and survival of H2 clouds.

Abstract Copyright: © P. Noterdaeme et al. 2019

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

Simbad objects: 85

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Number of rows : 85
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 SDSS J001514.81+184212.3 QSO 00 15 14.8208801424 +18 42 12.401174736           ~ 9 0
2 SDSS J001930.55-013708.4 QSO 00 19 30.5491980096 -01 37 08.448537828           ~ 13 0
3 SDSS J004605.89+004327.8 QSO 00 46 05.8962233376 +00 43 27.851995776           ~ 10 0
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11178 1
5 SDSS J005917.64+112407.7 QSO 00 59 17.6332835112 +11 24 07.650192672           ~ 10 0
6 SDSS J010211.88+025207.1 QSO 01 02 11.8869063240 +02 52 07.168098936           ~ 6 0
7 SDSS J012555.11-012925.1 QSO 01 25 55.1139355704 -01 29 25.272475944           ~ 6 0
8 SDSS J012654.45+113823.2 QSO 01 26 54.4552585896 +11 38 23.255982168           ~ 7 0
9 SDSS J013644.02+044039.0 QSO 01 36 44.0194613256 +04 40 39.109620504           ~ 13 0
10 SDSS J021602.33+041357.3 QSO 02 16 02.3316620736 +04 13 57.299982564           ~ 8 0
11 SDSS J021926.54-011057.2 QSO 02 19 26.5422368592 -01 10 57.226509696           ~ 9 0
12 SDSS J022316.89-030721.4 QSO 02 23 16.8941698632 -03 07 21.346147452           ~ 5 0
13 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17478 0
14 NAME LMC 2 Supergiant Shell sh 05 41 27 -69 22.4           ~ 191 0
15 SDSS J075402.68+435928.2 QSO 07 54 02.680 +43 59 28.25           ~ 6 0
16 SDSS J075634.69+112330.3 QSO 07 56 34.692 +11 23 30.35           ~ 7 0
17 [VV2006] J075901.3+284703 QSO 07 59 01.2846261816 +28 47 03.424189236   20.05 19.53     ~ 29 0
18 [VV2006] J080351.6+500318 QSO 08 03 51.6378495648 +50 03 17.671157856   20.87 20.26     ~ 30 0
19 SDSS J080757.44+515234.2 QSO 08 07 57.4476801048 +51 52 34.176673236           ~ 10 0
20 SDSS J081614.20+035819.8 QSO 08 16 14.2149505008 +03 58 19.790167476           ~ 6 0
21 SDSS J082126.13+362606.0 QSO 08 21 26.1389306568 +36 26 06.109350972           ~ 6 0
22 SDSS J084312.72+022117.2 QSO 08 43 12.7165734816 +02 21 17.341452360           ~ 22 0
23 SDSS J085502.18+420937.1 QSO 08 55 02.1827073144 +42 09 37.237126824           ~ 6 0
24 SDSS J085859.66+174925.1 QSO 08 58 59.6647623648 +17 49 25.177561392           ~ 11 0
25 [VV2006] J091146.7+411048 QSO 09 11 46.6967851704 +41 10 47.992863504   20.80 20.36     ~ 23 0
26 SDSS J091850.49+522003.5 QSO 09 18 50.4950472960 +52 20 03.525285300           ~ 7 0
27 SDSS J094738.40+063800.1 QSO 09 47 38.4044708928 +06 38 00.171490200           ~ 9 0
28 SDSS J094827.31+072236.9 QSO 09 48 27.3052907688 +07 22 37.035921180           ~ 10 0
29 SDSS J095549.69+605740.9 QSO 09 55 49.6974930240 +60 57 40.928362380           ~ 7 0
30 SDSS J100640.77+360234.1 QSO 10 06 40.7762558112 +36 02 34.100318904           ~ 6 0
31 [VV2006] J100852.6+475552 QSO 10 08 52.6119257784 +47 55 52.514382936   20.29 19.75     ~ 26 0
32 SDSS J101104.27+323911.0 QSO 10 11 04.2713191320 +32 39 11.024298216           ~ 8 0
33 SDSS J101404.95+272311.4 QSO 10 14 04.959 +27 23 11.47           ~ 7 0
34 SDSS J103143.86+224015.1 QSO 10 31 43.8607577712 +22 40 15.133481688           ~ 9 0
35 SDSS J104502.97+150211.3 QSO 10 45 02.970 +15 02 11.40           ~ 8 0
36 SDSS J104721.79+291547.7 QSO 10 47 21.7916650128 +29 15 47.746601352           ~ 7 0
37 SDSS J105251.23+180915.6 QSO 10 52 51.2312810136 +18 09 15.620559084           ~ 8 0
38 SDSS J111041.05+671550.4 QSO 11 10 41.0651428152 +67 15 50.193154656           ~ 7 0
39 SDSS J111103.78+331614.1 QSO 11 11 03.7842400272 +33 16 14.168368524           ~ 7 0
40 SDSS J111124.18+144756.0 QSO 11 11 24.1864094136 +14 47 56.077694700           ~ 9 0
41 SDSS J112214.56+421958.6 QSO 11 22 14.5560691224 +42 19 58.656960552           ~ 8 0
42 SDSS J112340.08+155353.6 QSO 11 23 40.0885631592 +15 53 53.590392132   22.77 21.53     ~ 14 0
43 SDSS J113155.38+081239.1 QSO 11 31 55.383 +08 12 39.18           ~ 8 0
44 SDSS J113517.10+295722.0 QSO 11 35 17.1037243368 +29 57 21.876492816           ~ 8 0
45 SDSS J114410.89+473451.6 QSO 11 44 10.8868542888 +47 34 51.666972636           ~ 10 0
46 SDSS J114452.48+203644.1 QSO 11 44 52.4865127632 +20 36 44.061885864           ~ 6 0
47 [VV2006] J114552.4+495114 QSO 11 45 52.4298803616 +49 51 14.007668076   21.17 20.56     ~ 22 0
48 SDSS J115314.86+581440.2 QSO 11 53 14.8564281624 +58 14 39.944641524           ~ 8 0
49 SDSS J120051.83+140831.4 QSO 12 00 51.8363637120 +14 08 31.455225996   21.61 21.03     ~ 21 0
50 SDSS J122856.07+314753.8 QSO 12 28 56.0774820648 +31 47 53.785228884           ~ 6 0
51 SDSS J123602.11+001024.6 QSO 12 36 02.1182718312 +00 10 24.549544740           ~ 15 0
52 SDSS J124110.69+383536.4 QSO 12 41 10.6868830032 +38 35 36.521577168           ~ 5 0
53 SDSS J124201.73+200625.5 QSO 12 42 01.7339726880 +20 06 25.609352256           ~ 8 0
54 SDSS J124234.81+444813.1 QSO 12 42 34.8177458808 +44 48 13.092974820           ~ 9 0
55 SDSS J124527.16+322136.0 QSO 12 45 27.1674406296 +32 21 36.090548892           ~ 8 0
56 SDSS J124829.50+063935.6 QSO 12 48 29.5047357120 +06 39 35.584287048           ~ 13 0
57 SDSS J125917.30+030922.5 QSO 12 59 17.3080665072 +03 09 22.537766412           ~ 9 0
58 SDSS J130709.96+302818.7 QSO 13 07 09.9666550584 +30 28 18.762521124   22.23 21.28     ~ 15 0
59 SDSS J131129.10+222552.5 QSO 13 11 29.1083707728 +22 25 52.585583628   20.62 20.03     ~ 18 0
60 SDSS J131904.34+135649.5 QSO 13 19 04.3451121552 +13 56 49.554244572           ~ 7 0
61 SDSS J132618.07+255851.5 QSO 13 26 18.0686128008 +25 58 51.473257176   21.81 20.91     ~ 12 0
62 SDSS J133111.41+020609.0 QSO 13 31 11.4096736536 +02 06 09.033476652           ~ 9 0
63 SDSS J133650.63+251328.3 QSO 13 36 50.6251518504 +25 13 28.335294624           ~ 9 0
64 SDSS J135808.94+141053.2 QSO 13 58 08.9485980792 +14 10 53.264669880   20.74 20.13     ~ 17 0
65 SDSS J135935.07+090051.3 QSO 13 59 35.0803151376 +09 00 51.341387580           ~ 8 0
66 SDSS J141118.14+021512.0 QSO 14 11 18.1466357688 +02 15 12.011120748           ~ 8 0
67 SDSS J141745.90+362127.4 QSO 14 17 45.904 +36 21 27.45           ~ 9 0
68 SDSS J142141.25+524551.6 QSO 14 21 41.2538071752 +52 45 51.505191108           ~ 15 0
69 SDSS J143042.90+054907.9 QSO 14 30 42.9070787664 +05 49 07.884409980           ~ 7 0
70 SDSS J144924.08+244123.1 QSO 14 49 24.0789783888 +24 41 23.161376868           ~ 8 0
71 SDSS J150450.99+302245.3 QSO 15 04 50.9917368624 +30 22 45.258148128           ~ 9 0
72 SDSS J151222.27+382107.3 QSO 15 12 22.2739266360 +38 21 07.404025392           ~ 8 0
73 SDSS J151504.52+144823.1 QSO 15 15 04.5242486064 +14 48 23.191974504           ~ 7 0
74 SDSS J154443.05+182945.8 QSO 15 44 43.0528460400 +18 29 45.910287852           ~ 8 0
75 SDSS J154620.43+424451.6 QSO 15 46 20.4346623384 +42 44 51.617052852           ~ 8 0
76 SDSS J160432.34+575721.9 QSO 16 04 32.3446637496 +57 57 21.938750928           ~ 6 0
77 SDSS J160638.54+333432.8 QSO 16 06 38.5344069528 +33 34 32.964324708           ~ 9 0
78 SDSS J163831.22+485726.0 QSO 16 38 31.220 +48 57 26.04           ~ 5 0
79 [VV2006] J164104.0+433356 QSO 16 41 04.0017766728 +43 33 56.017982772   21.62 21.10     ~ 23 0
80 SDSS J170615.67+375613.7 QSO 17 06 15.6757024272 +37 56 13.743163644           ~ 6 0
81 SDSS J215828.88+240435.7 QSO 21 58 28.8805895664 +24 04 35.864923044           ~ 5 0
82 SDSS J222807.36-022117.2 QSO 22 28 07.3544202408 -02 21 17.139473748           ~ 10 0
83 SDSS J225506.64+194910.1 QSO 22 55 06.6424569504 +19 49 10.082213688           ~ 6 0
84 SDSS J232506.61+153929.3 QSO 23 25 06.6120441552 +15 39 29.387264976           ~ 6 0
85 SDSS J233607.16+225325.7 QSO 23 36 07.1629548312 +22 53 25.816947576           ~ 6 0

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