2010ApJ...714.1521C

Query : 2010ApJ...714.1521C

2010ApJ...714.1521C - Astrophys. J., 714, 1521-1541 (2010/May-2)

An empirical characterization of extended cool gas around galaxies using Mg II absorption features.

CHEN H.-W., HELSBY J.E., GAUTHIER J.-R., SHECTMAN S.A., THOMPSON I.B. and TINKER J.L.

Abstract (from CDS):

We report results from a survey of Mg II absorbers in the spectra of background quasi-stellar objects (QSOs) that are within close angular distances to a foreground galaxy at z < 0.5, using the Magellan Echellette Spectrograph. We have established a spectroscopic sample of 94 galaxies at a median redshift of 〈z〉 = 0.24 in fields around 70 distant background QSOs (zQSO > 0.6), 71 of which are in an "isolated" environment with no known companions and located at ρ ≲ 120 h–1 kpc from the line of sight of a background QSO. The rest-frame absolute B-band magnitudes span a range from MB- 5log h = -16.4 to MB- 5log h = -21.4 and rest-frame BAB- RAB colors range from BAB- RAB≈ 0 to BAB- RAB≈ 1.5. Of these "isolated" galaxies, we find that 47 have corresponding Mg II absorbers in the spectra of background QSOs and rest-frame absorption equivalent width Wr(2796) = 0.1-2.34 Å, and 24 do not give rise to Mg II absorption to sensitive upper limits. Our analysis shows that (1) Wr(2796) declines with increasing distance from "isolated" galaxies but shows no clear trend in "group" environments; (2) more luminous galaxies possess more extended Mg II absorbing halos with the gaseous radius scaled by B-band luminosity according to Rgas= 75 x(LB/LB*)(0.35±0.03) h–1 kpc; (3) there is little dependence between the observed absorber strength and galaxy intrinsic colors; and (4) within Rgas, we find a mean covering fraction of 〈κ0.3〉 ≈ 70% for absorbers of Wr(2796) ≥ 0.3 Å and 〈κ0.1〉 ≈ 80% for absorbers of Wr(2796) ≥ 0.1 Å. The results confirm that extended Mg II absorbing halos are a common and generic feature around ordinary galaxies and that the gaseous radius is a fixed fraction of the dark matter halo radius. The lack of correlation between Wr(2796) strength and galaxy colors suggests a lack of physical connection between the origin of extended Mg II halos and recent star formation history of the galaxies. Finally, we discuss the total gas mass in galactic halos as traced by Mg II absorbers. We also compare our results with previous studies.

Abstract Copyright: ∼

Journal keyword(s): cosmology: observations - intergalactic medium - quasars: absorption lines

VizieR on-line data: <Available at CDS (J/ApJ/714/1521): table1.dat table2.dat table3.dat>

Simbad objects: 168

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Number of rows : 168
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SDSS J003339.66-005518.3 G 00 33 39.6621850176 -00 55 18.344472708           ~ 3 0
2 SDSS J003339.85-005522.3 G 00 33 39.851 -00 55 22.21   19.44       ~ 7 0
3 [VV2006] J003340.2-005525 QSO 00 33 40.2154205832 -00 55 25.577660496   18.10 17.82     ~ 35 0
4 SDSS J003341.47-005522.8 G 00 33 41.475 -00 55 22.82           ~ 3 0
5 PB 8356 QSO 00 34 07.3518832680 -08 54 52.121639916   17.8 18.37 18.0   ~ 25 0
6 SDSS J003407.77-085453.2 G 00 34 07.778 -08 54 53.28   22.41       ~ 5 0
7 SDSS J003412.84-010019.8 G 00 34 12.848 -01 00 19.81   21.68       ~ 5 0
8 [VV2006] J003413.1-010026 QSO 00 34 13.0453342848 -01 00 26.962936992   17.37 17.11     ~ 35 0
9 SDSS J003414.49-005927.5 G 00 34 14.4925488816 -00 59 27.581722800           ~ 4 0
10 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
11 [VV2006] J010135.9-005008 QSO 01 01 35.8511272080 -00 50 09.091384764   17.7 19.23 18.4   ~ 34 0
12 SDSS J010136.51-005016.4 G 01 01 36.5184765384 -00 50 16.597180176   20.91       ~ 5 0
13 SDSS J010155.80-084408.7 G 01 01 55.802 -08 44 08.75   21.08       ~ 5 0
14 [VV2006] J010156.3-084402 QSO 01 01 56.3120941128 -08 44 01.758494868   18.50 18.19 17.92   ~ 26 0
15 SDSS J010351.82+003740.7 G 01 03 51.821 +00 37 40.75   22.59       ~ 5 0
16 FBQS J0103+0037 QSO 01 03 52.4671906296 +00 37 39.801564048   18.46 18.16     ~ 51 0
17 LBQS 0102-0106 QSO 01 05 08.1378103080 -00 50 41.292348900   17.7 18.07 17.9   ~ 42 0
18 [VV2006] J021558.4-011135 QSO 02 15 58.4083325640 -01 11 35.910972240   18.19 18.02     ~ 32 0
19 SDSS J021558.84-011131.2 G 02 15 58.8490455744 -01 11 31.345589688   20.13       ~ 5 0
20 SDSS J022949.96-074255.8 G 02 29 49.969 -07 42 55.89   22.08       ~ 5 0
21 [VV2006] J022950.3-074256 QSO 02 29 50.3142147960 -07 42 56.719167912   19.27 19.03     ~ 25 0
22 QSO B0238-0058 Sy1 02 41 26.7134993016 -00 45 26.256833640   18.71 18.52     ~ 40 0
23 SDSS J024127.74-004517.0 G 02 41 27.7452849192 -00 45 17.025634656           ~ 4 0
24 SDSS J032230.27+003712.7 G 03 22 30.273 +00 37 12.71           ~ 3 0
25 SDSS J032232.55+003644.6 G 03 22 32.550 +00 36 44.67   22.48       ~ 5 0
26 SDSS J032232.57+003649.0 QSO 03 22 32.5823645976 +00 36 49.125082644   18.9 19.15 18.8   ~ 19 0
27 GD 50 WD* 03 48 50.1859724280 -00 58 32.290187664 12.596 13.787 14.063 14.210 14.388 DA1.2 272 1
28 SDSS J035241.99+001317.1 G 03 52 41.996 +00 13 17.13   22.54       ~ 5 0
29 [VV2006] J035242.1+001307 QSO 03 52 42.1140580104 +00 13 07.320357732   19.38 19.01     ~ 26 0
30 [VV2006] J040404.0-060714 QSO 04 04 04.0818508728 -06 07 14.067863220   19.25 18.87     ~ 21 0
31 SDSS J040404.51-060709.4 G 04 04 04.515 -06 07 09.44           ~ 3 0
32 SDSS J074527.07+191959.9 G 07 45 27.0763085592 +19 19 59.931972192           ~ 2 0
33 SDSS J074527.21+192003.8 G 07 45 27.213 +19 20 03.85           ~ 3 0
34 [VV2006] J074528.2+191952 QSO 07 45 28.1435288832 +19 19 52.655625696   18.03 17.88     ~ 28 0
35 SDSS J075001.33+161301.9 G 07 50 01.336 +16 13 01.90   21.30       ~ 5 0
36 SDSS J075001.84+161305.0 QSO 07 50 01.8442981248 +16 13 05.037130236   18.68 18.35     ~ 21 0
37 2MASS J07545004+1849528 QSO 07 54 50.0469944808 +18 49 52.853356452   18.38 18.19     ~ 22 0
38 SDSS J075450.10+185005.2 G 07 54 50.104 +18 50 05.27   21.25       ~ 5 0
39 SDSS J075525.13+172825.7 G 07 55 25.132 +17 28 25.78   20.57       ~ 5 0
40 2MASS J07552547+1728362 QSO 07 55 25.5009829032 +17 28 36.565971096   18.86 18.45     ~ 21 0
41 2MASS J08000456+1849350 QSO 08 00 04.5447379968 +18 49 35.148447696   18.32 18.08     ~ 28 0
42 SDSS J080005.11+184933.2 G 08 00 05.114 +18 49 33.28   20.76       ~ 5 0
43 [VV2006] J082340.2+074801 QSO 08 23 40.1725800720 +07 48 01.696235076   18.54 18.34     ~ 24 0
44 SDSS J082340.55+074751.0 G 08 23 40.5603447168 +07 47 51.063370116   19.74       ~ 5 0
45 SDSS J083218.54+043337.7 G 08 32 18.5506240416 +04 33 37.789213644           ~ 3 0
46 SDSS J083218.75+043346.5 G 08 32 18.7631589384 +04 33 46.596260988           ~ 3 0
47 [VV2006] J083220.7+043416 QSO 08 32 20.7415405848 +04 34 16.791406788   18.34 18.12     ~ 30 0
48 SDSS J083221.59+043359.7 G 08 32 21.590 +04 33 59.72           ~ 3 0
49 [VV2006] J084119.7+012621 QSO 08 41 19.7599890936 +01 26 21.769478232   18.39 18.19     ~ 26 0
50 SDSS J084120.58+012628.8 G 08 41 20.589 +01 26 28.85   21.51       ~ 7 0
51 SDSS J084455.57+004718.1 G 08 44 55.596 +00 47 18.16   19.71       ~ 9 0
52 [VV2006] J084456.0+004709 QSO 08 44 56.0759207256 +00 47 08.948847336   17.6 18.45 18.0   ~ 28 0
53 [VV2006] J085827.0+022604 QSO 08 58 26.9184210696 +02 26 04.498699056   18.24 17.94     ~ 28 0
54 SDSS J085829.88+022616.0 G 08 58 29.890 +02 26 16.05   19.34       ~ 6 0
55 SDSS J090519.02+084933.6 G 09 05 19.021 +08 49 33.68   21.66       ~ 5 0
56 SDSS J090519.61+084932.2 G 09 05 19.615 +08 49 32.20   21.91       ~ 5 0
57 [VV2006] J090519.7+084917 QSO 09 05 19.7098546968 +08 49 17.361572340   18.66 18.42     ~ 24 0
58 SDSS J091845.09+060202.9 G 09 18 45.1016980584 +06 02 02.963365332   19.98       ~ 5 0
59 SDSS J091845.69+060220.5 G 09 18 45.697 +06 02 20.54           ~ 3 0
60 [VV2006] J091845.9+060226 QSO 09 18 45.9236749752 +06 02 26.147614488   17.94 17.74     ~ 31 0
61 [VV2006] J093251.8+073729 QSO 09 32 51.8326261248 +07 37 29.037040176   18.02 17.76     ~ 31 0
62 SDSS J093252.23+073731.5 G 09 32 52.239 +07 37 31.59   21.42       ~ 5 0
63 [VV2006] J093537.0+112408 QSO 09 35 36.9940681968 +11 24 07.999426404   18.56 18.32     ~ 25 0
64 SDSS J093537.23+112410.6 G 09 35 37.239 +11 24 10.65   21.35       ~ 5 0
65 [VV2006] J100807.5+014449 QSO 10 08 07.5140608080 +01 44 49.090900596   18.01 17.56     ~ 29 0
66 SDSS J100810.59+014446.1 G 10 08 10.597 +01 44 46.15   19.006   17.787   ~ 6 0
67 [VV2006] J100906.3+023555 QSO 10 09 06.3498830016 +02 35 55.367665836   17.36 17.07     ~ 33 0
68 SDSS J100906.92+023557.8 G 10 09 06.9237567528 +02 35 57.815903436   20.70       ~ 5 0
69 LBQS 1019+0147 QSO 10 22 18.9951068448 +01 32 18.805950420   16.98 16.82     ~ 52 0
70 SDSS J102220.70+013143.5 G 10 22 20.7080091864 +01 31 43.470697692   19.064   17.656   ~ 7 0
71 SDSS J103605.25+015654.8 G 10 36 05.254 +01 56 54.90   20.00       ~ 5 0
72 SDSS J103607.52+015659.0 BLL 10 36 07.5230207352 +01 56 59.018161524   19.22 18.99     ~ 31 0
73 SDSS J103836.38+095143.6 G 10 38 36.389 +09 51 43.66   21.26       ~ 5 0
74 [VV2006] J103836.5+095139 QSO 10 38 36.4977706416 +09 51 38.915118972   18.48 18.15     ~ 26 0
75 SDSS J112016.64+093317.9 G 11 20 16.642 +09 33 17.92   21.67       ~ 5 0
76 [VV2006] J112016.7+093323 QSO 11 20 16.6487240352 +09 33 23.529465468   18.32 18.00     ~ 28 0
77 SDSS J113756.74+085022.3 G 11 37 56.747 +08 50 22.35   21.76       ~ 5 0
78 [VV2006] J113757.0+085016 QSO 11 37 57.0256083480 +08 50 17.180555892   18.77 18.49     ~ 25 0
79 [VV2006] J114144.6+080615 QSO 11 41 44.6320809264 +08 06 14.792823864   18.67 18.37     ~ 23 0
80 SDSS J114144.82+080554.0 G 11 41 44.829 +08 05 54.09   20.12       ~ 6 0
81 SDSS J114145.15+080605.2 G 11 41 45.151 +08 06 05.27   21.24       ~ 6 0
82 LBQS 1145+0235 QSO 11 48 30.1245799608 +02 18 29.786500296   17.91 17.67     ~ 33 0
83 SDSS J114830.93+021807.9 G 11 48 30.936 +02 18 07.92           ~ 3 0
84 SDSS J114831.01+021803.1 G 11 48 31.011 +02 18 03.11           ~ 2 0
85 SDSS J120931.60+004546.2 G 12 09 31.602 +00 45 46.24   21.86       ~ 5 0
86 2MASS J12093225+0045559 QSO 12 09 32.2584353040 +00 45 55.902674304   17.81 17.35     ~ 19 0
87 SDSS J121347.08+000141.2 G 12 13 47.084 +00 01 41.26           ~ 3 0
88 SDSS J121347.14+000136.6 G 12 13 47.1431734656 +00 01 36.683767704           ~ 5 0
89 [VV2006] J121347.6+000129 Bla 12 13 47.5332255480 +00 01 30.032861160   18.42 18.25     ~ 47 1
90 [VV2006] J122115.4-020253 QSO 12 21 15.3293878416 -02 02 53.333093184   17.80 17.63     ~ 31 0
91 SDSS J122115.83-020259.3 G 12 21 15.8466054024 -02 02 59.608542408           ~ 3 0
92 2MASS J12573917+1448061 QSO 12 57 39.2082257904 +14 48 06.176342160   18.50 18.32     ~ 21 0
93 [VV2000] J130554.1+014930 QSO 13 05 54.1649591352 +01 49 29.879042160   17.91 17.72     ~ 51 1
94 SDSS J130555.48+014928.6 G 13 05 55.487 +01 49 28.62   20.30       ~ 5 0
95 2dFGRS TGN395Z184 BiC 13 05 57.0432372024 +01 49 22.294997580   19.196   17.737   ~ 7 0
96 SDSS J132757.22+101135.9 G 13 27 57.228 +10 11 35.97   21.63       ~ 5 0
97 SDSS J132757.40+101141.7 QSO 13 27 57.4069412232 +10 11 41.756117676   18.51 18.21     ~ 18 0
98 SDSS J132829.30+080003.1 G 13 28 29.305 +08 00 03.16           ~ 3 0
99 SDSS J132830.61+080005.2 G 13 28 30.616 +08 00 05.21           ~ 3 0
100 2MASS J13283106+0759419 QSO 13 28 31.0744860792 +07 59 42.009045936   18.43 18.06     ~ 22 0
101 SDSS J132831.14+075923.8 G 13 28 31.140 +07 59 23.89           ~ 3 0
102 SDSS J132831.54+075942.9 G 13 28 31.543 +07 59 42.99   20.64       ~ 5 0
103 SDSS J132832.73+075952.5 G 13 28 32.731 +07 59 52.54   20.15       ~ 5 0
104 QSO B1336+0037 QSO 13 39 04.3463964168 +00 22 21.687199068   18.19 17.91     ~ 37 0
105 SDSS J133905.85+002225.3 G 13 39 05.8528835568 +00 22 25.451597532           ~ 4 0
106 SDSS J140618.34+130143.6 G 14 06 18.3430448520 +13 01 43.644970812   19.07       ~ 6 0
107 [VV2006] J140619.6+130107 QSO 14 06 19.5918712248 +13 01 06.803270616   18.66 18.40     ~ 23 0
108 SDSS J140619.93+130105.2 G 14 06 19.933 +13 01 05.24   20.65       ~ 5 0
109 [VV2006] J142556.4-001818 QSO 14 25 56.3902770360 -00 18 18.729702828   19.02 18.76     ~ 28 0
110 LEDA 1146654 G 14 26 00.0423686520 -00 18 18.072264420   17.747   16.173   ~ 11 0
111 QSO B1429+1008 QSO 14 32 16.7807230848 +09 55 19.242601536   17.59 17.44     ~ 30 0
112 SDSS J143216.96+095522.2 G 14 32 16.968 +09 55 22.20   21.89       ~ 5 0
113 [VV2006] J144033.8+044831 QSO 14 40 33.8259699792 +04 48 30.968319960   17.2 18.52 18.0   ~ 26 0
114 SDSS J150339.61+064235.0 G 15 03 39.614 +06 42 35.03   21.09       ~ 5 0
115 2MASS J15033996+0642597 QSO 15 03 39.9914447016 +06 42 59.953797144   18.61 18.39     ~ 20 0
116 SDSS J150340.14+064308.1 G 15 03 40.148 +06 43 08.10   21.80       ~ 5 0
117 SDSS J151228.24-011216.1 G 15 12 28.248 -01 12 16.10   19.88       ~ 5 0
118 [VV2006] J151228.8-011222 QSO 15 12 28.8357272688 -01 12 22.976578548   18.53 18.23     ~ 27 0
119 SDSS J151536.18+334743.6 G 15 15 36.1833148080 +33 47 43.527207768           ~ 1 0
120 [VV2006] J151541.2+334739 QSO 15 15 41.2329006048 +33 47 39.462196092   19.01 18.97     ~ 26 0
121 SDSS J153112.76+091119.7 G 15 31 12.765 +09 11 19.73   22.02       ~ 5 0
122 2MASS J15311298+0911389 QSO 15 31 12.9764996232 +09 11 38.712862788   18.50 18.18     ~ 17 0
123 SDSS J153113.00+091127.0 G 15 31 13.008 +09 11 27.02   22.03       ~ 5 0
124 [VV2006] J153715.3+023049 QSO 15 37 15.3421420128 +02 30 49.807756116   17.70 17.58     ~ 31 0
125 SDSS J153715.67+023056.4 G 15 37 15.672 +02 30 56.40   20.27       ~ 5 0
126 [VV2006] J155336.5+053423 QSO 15 53 36.4674232224 +05 34 24.004821684   18.68 18.42     ~ 25 0
127 SDSS J155336.77+053438.2 G 15 53 36.772 +05 34 38.23   20.41       ~ 5 0
128 SDSS J155556.55-003615.5 G 15 55 56.550 -00 36 15.56   21.81       ~ 5 0
129 [VV2006] J155557.0-003608 QSO 15 55 57.0658030104 -00 36 08.431979148   18.08 17.84     ~ 29 0
130 [VV2006] J160749.3-002219 QSO 16 07 49.3378425144 -00 22 19.918564032   18.08 17.73     ~ 24 0
131 SDSS J160749.52-002228.4 G 16 07 49.525 -00 22 28.41   21.34       ~ 5 0
132 SDSS J160905.42+071337.2 QSO 16 09 05.4203402352 +07 13 37.279385904   18.37 18.26     ~ 17 0
133 SDSS J160906.34+071330.6 G 16 09 06.348 +07 13 30.66   20.10       ~ 5 0
134 NAME HVC Complex C HVC 16 34.8 +63 07           ~ 273 1
135 SDSS J204303.54-010139.0 G 20 43 03.540 -01 01 39.05   19.49       ~ 5 0
136 [VV2006] J204303.6-010126 QSO 20 43 03.5405866872 -01 01 26.015202480   17.77 17.44     ~ 27 0
137 SDSS J204304.34-010137.9 G 20 43 04.347 -01 01 37.91   20.44       ~ 5 0
138 SDSS J204431.32+011304.9 G 20 44 31.3192598400 +01 13 04.958604192           ~ 3 0
139 [VV2006] J204431.5+011312 QSO 20 44 31.4575559688 +01 13 12.435396096   19.14 18.84     ~ 25 0
140 SDSS J204431.86+011308.8 G 20 44 31.862 +01 13 08.81           ~ 3 0
141 [VV2006] J210230.8+094125 QSO 21 02 30.7090107528 +09 41 25.054689228   18.77 18.51     ~ 28 0
142 SDSS J210230.87+094121.0 G 21 02 30.870 +09 41 21.07   22.30       ~ 5 0
143 [VV2006] J212938.5-063801 QSO 21 29 38.5884565080 -06 38 01.860596016   18.12 17.82     ~ 23 0
144 SDSS J212938.97-063758.7 G 21 29 38.976 -06 37 58.78   22.29       ~ 5 0
145 SDSS J221126.42+124459.9 G 22 11 26.420 +12 44 59.92   22.33       ~ 5 0
146 [VV2006] J221126.8+124457 QSO 22 11 26.7596573112 +12 44 58.160208660   18.05 17.94     ~ 29 0
147 SDSS J221526.04+011353.7 G 22 15 26.049 +01 13 53.78 22.5169 21.35     19.8275 ~ 8 0
148 SDSS J221526.75+011356.4 QSO 22 15 26.7467058576 +01 13 56.468483256   18.5 19.04 18.4   ~ 21 0
149 SDSS J221526.88+011347.2 G 22 15 26.889 +01 13 47.20   22.06       ~ 5 0
150 SDSS J222849.01-005640.0 G 22 28 49.013 -00 56 40.06           ~ 3 0
151 [VV2006] J222849.2-005630 QSO 22 28 49.2013011336 -00 56 30.821083440   18.90 18.45     ~ 26 0
152 SDSS J223246.44+134655.3 G 22 32 46.441 +13 46 55.37   20.41       ~ 5 0
153 2MASS J22324682+1347019 QSO 22 32 46.8076619760 +13 47 02.079561732   18.36 17.93     ~ 32 0
154 SDSS J223316.35+133315.3 G 22 33 16.353 +13 33 15.39   19.82       ~ 5 0
155 2MASS J22331688+1333099 QSO 22 33 16.8756889488 +13 33 09.966477204   18.52 18.24     ~ 26 0
156 SDSS J223359.74-003320.8 G 22 33 59.740 -00 33 20.81   20.70       ~ 5 0
157 LBQS 2231-0048 QSO 22 33 59.9314052040 -00 33 15.796616148   18.19 17.76     ~ 44 0
158 SDSS J224704.01-081601.0 G 22 47 04.015 -08 16 01.00   21.23       ~ 5 0
159 PB 7206 QSO 22 47 04.7639397864 -08 16 17.547288636   17.65 17.33     ~ 30 0
160 SDSS J230225.06-082156.6 G 23 02 25.062 -08 21 56.62   21.90       ~ 5 0
161 SDSS J230225.17-082159.0 G 23 02 25.173 -08 21 59.03           ~ 3 0
162 [VV2006] J230225.5-082154 QSO 23 02 25.4951868600 -08 21 54.074974896   18.8 18.96 18.3   ~ 27 0
163 SDSS J230845.53-091445.9 G 23 08 45.532 -09 14 45.96   21.42       ~ 5 0
164 SDSS J230845.60-091449.4 QSO 23 08 45.6034574064 -09 14 49.403167512   19.31 19.01     ~ 24 0
165 SDSS J232812.79-090603.7 G 23 28 12.791 -09 06 03.73           ~ 3 0
166 PHL 2344 QSO 23 28 12.9156111192 -09 05 22.504217064   17.90 17.71     ~ 24 0
167 SDSS J234949.41+003542.3 G 23 49 49.414 +00 35 42.32   21.71       ~ 5 0
168 [VV2006] J234949.6+003535 QSO 23 49 49.6149348576 +00 35 35.360520396   19.11 18.68     ~ 32 0

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