2012A&A...542A.110B


Query : 2012A&A...542A.110B

2012A&A...542A.110B - Astronomy and Astrophysics, volume 542A, 110-110 (2012/6-1)

An absorption-selected survey of neutral gas in the Milky way halo. New results based on a large sample of Ca II, Na I, and H I spectra towards QSOs.

BEN BEKHTI N., WINKEL B., RICHTER P., KERP J., KLEIN U. and MURPHY M.T.

Abstract (from CDS):

We aim at analysing systematically the distribution and physical properties of neutral and mildly ionised gas in the Milky Way halo, based on a large absorption-selected data set. Multi-wavelength studies were performed combining optical absorption line data of CaII and NaI with follow-up HI 21-cm emission line observations along 408 sight lines towards low- and high-redshift QSOs. We made use of archival optical spectra obtained with UVES/VLT. HI data were extracted from the Effelsberg-Bonn HI survey and the Galactic All-Sky survey. For selected sight lines we obtained deeper follow-up observations using the Effelsberg 100-m telescope. CaII (NaI) halo absorbers at intermediate and high radial velocities are present in 40-55% (20-35%) of the sightlines, depending on the column density threshold chosen. Many halo absorbers show multi-component absorption lines, indicating the presence of sub-structure. In 65% of the cases, absorption is associated with HI 21-cm emission. The CaII (NaI) column density distribution function follows a power-law with a slope of β≃-2.2 (-1.4). Our absorption-selected survey confirms our previous results that the Milky Way halo is filled with a large number of neutral gas structures whose high column density tail represents the population of common HI high- and intermediate-velocity clouds seen in 21-cm observations. We find that NaI/CaII column density ratios in the halo absorbers are typically smaller than those in the Milky Way disc, in the gas in the Magellanic Clouds, and in damped Lymanα systems. The small ratios (prominent in particular in high-velocity components) indicate a lower level of Ca depletion onto dust grains in Milky Way halo absorbers compared to gas in discs and inner regions of galaxies.

Abstract Copyright:

Journal keyword(s): Galaxy: halo - ISM: structure

VizieR on-line data: <Available at CDS (J/A+A/542/A110): table1.dat>

Simbad objects: 57

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Number of rows : 57
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 QSO J0003-2323 QSO 00 03 44.9144535192 -23 23 55.073021280     16.7     ~ 78 0
2 QSO B0002-422 QSO 00 04 48.2718888096 -41 57 28.148932548   17.44 17.21     ~ 161 0
3 QSO J0008-0958 QSO 00 08 15.3304880496 -09 58 54.444822024   19.21 18.75     ~ 42 0
4 QSO J0008-2900 QSO 00 08 52.7138115360 -29 00 43.768919952   19.12 18.55     ~ 16 0
5 NAME Magellanic Stream HVC 00 32 -30.0           ~ 942 1
6 4C -02.04A QSO 00 40 57.6113680704 -01 46 32.027603772   18.5 18.00 18.38   ~ 102 1
7 LBQS 0042-2930 QSO 00 45 08.5282842672 -29 14 32.499502620   17.92       ~ 30 0
8 LBQS 0049-2820 QSO 00 51 27.1928384280 -28 04 33.966262488     18.1     ~ 45 0
9 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10845 1
10 LBQS 0056-0009 Sy1 00 59 05.5147782072 +00 06 51.620377428   18.07 17.89 16.9   ~ 270 1
11 PHL 957 QSO 01 03 11.2741573824 +13 16 17.809871484   16.97 16.57     ~ 343 0
12 QSO J0105-1846 QSO 01 05 16.7912097864 -18 46 41.986634736     18.3     ~ 78 0
13 QSO B0105+061 QSO 01 08 21.7326397272 +06 23 27.192791256   17 17.2     ~ 26 0
14 QSO B0109-353 QSO 01 11 43.6321128912 -35 03 00.587535660   16.6 16.9     ~ 77 0
15 QSO B0112-30 QSO 01 15 04.8742901280 -30 25 14.952952308           ~ 49 1
16 ICRF J011818.4+025805 Sy1 01 18 18.4816422984 +02 58 05.790609192     17.5     ~ 137 1
17 4C -04.04 QSO 01 22 27.8852581608 -04 21 27.176403816   17.34 16.88     ~ 186 1
18 QSO B0122-379 QSO 01 24 17.3720154480 -37 44 22.919854020     17.1     ~ 119 0
19 4C -00.10 QSO 01 25 17.1506405376 -00 18 28.907967636   18.73 18.60 18.4   ~ 86 1
20 QSO J0125-0006 Bla 01 25 28.8438355224 -00 05 55.930595964   16.92 16.64 16.30   ~ 289 1
21 2MASS J01294490-4033454 Sy1 01 29 44.8951835928 -40 33 45.531564012   18.12 17.00 16.94   ~ 16 0
22 QSO B0130-17 QSO 01 32 43.48746292 -16 54 48.5220804   18.75 18.44 15.44   ~ 212 1
23 [VV98] J013523.2-410657 QSO 01 35 22.1 -41 07 00     17.62     ~ 5 1
24 QSO J0139-0824 QSO 01 39 01.4050523400 -08 24 44.045742600   19.05 18.80     ~ 51 0
25 [VV2006] J014632.0+133506 QSO 01 46 31.9903572024 +13 35 06.382725216   17.49 17.42     ~ 31 0
26 [VV96] J025240.1-553832 QSO 02 52 40.1052821064 -55 38 32.029465596   17.4 17.4     ~ 14 0
27 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6827 1
28 2MASSI J0352305-071102 Sy1 03 52 30.5518280976 -07 11 02.326141644   17.02 16.67     ~ 157 1
29 QSO J0453-1305 QSO 04 53 13.5744238944 -13 05 55.085318988   13.2 16.5     ~ 92 2
30 QSO J0506-6109 QSO 05 06 43.98874900 -61 09 40.9939787   17.16 16.85 16.9   ~ 177 2
31 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16983 1
32 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4861 2
33 QSO B0810+2554 QSO 08 13 31.2700262826 +25 45 03.076030845   16.58 16.18     ~ 104 0
34 4C 14.31 QSO 09 25 07.2643599456 +14 44 25.721599128   18.50 17.96     ~ 93 2
35 QSO J1039-2719 QSO 10 39 21.8517992640 -27 19 16.435341732     17.4     ~ 91 0
36 QSO B1038-2712 QSO 10 40 32.2200380808 -27 27 49.078018224   17.9 17.7     ~ 44 0
37 [VV96] J112910.9-231628 QSO 11 29 10.8484787784 -23 16 28.236577944     17.3     ~ 10 0
38 Ton 1480 QSO 12 15 09.2309649888 +33 09 55.239405012   16.56 16.45     ~ 57 0
39 NGC 4748 Sy1 12 52 12.4650934680 -13 24 53.262019944   14.73 14.03 12.82   ~ 248 0
40 3C 281 Sy1 13 07 53.9295304872 +06 42 13.877755920   17.15 17.02     ~ 143 2
41 QSO B1331+170 Bla 13 33 35.7827544072 +16 49 04.013500728   16.84 16.71 16.41   ~ 443 0
42 ICRF J135256.5-441240 BLL 13 52 56.53494646 -44 12 40.3876155   16.95 16.37     ~ 112 3
43 QSO B1429-008B QSO 14 32 28.9493827968 -01 06 13.604773608   21.32 21.03 20.85   ~ 25 1
44 QSO B1448-232 QSO 14 51 02.5093156224 -23 29 31.107548184   17.13 16.96     ~ 131 2
45 4C -05.64 QSO 15 10 53.59142427 -05 43 07.4175000   17.44 17.21     ~ 213 1
46 4C 12.59 QSO 16 31 45.1708807968 +11 56 03.203387592   18.38 18.40     ~ 121 1
47 NAME HVC Complex C HVC 16 34.8 +63 07           ~ 252 1
48 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13898 0
49 [VV2006] J225153.2-314619 QSO 22 51 53.1579585600 -31 46 20.073736308     19.27     ~ 7 0
50 [VV2006] J225154.9-314521 QSO 22 51 54.8322092448 -31 45 21.285554544     19.43     ~ 7 0
51 [VV2006] J232046.7-294406 QSO 23 20 46.7121615144 -29 44 06.359644824   19.83       ~ 11 0
52 [VV2006] J232059.4-295520 QSO 23 20 59.4006727584 -29 55 21.284917176   18.99       ~ 11 0
53 [VV2006] J232114.3-294725 QSO 23 21 14.2440115008 -29 47 25.135698732   19.99       ~ 9 0
54 [VV2006] J232121.2-294350 QSO 23 21 21.2547638808 -29 43 50.657226564   19.70       ~ 11 0
55 NAME IV Arch PoC ~ ~           ~ 57 1
56 NAME IV Spur PoC ~ ~           ~ 24 0
57 NAME Local Group GrG ~ ~           ~ 8151 0

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2023.09.27-17:30:53

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