1999AJ....117..908K


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.21CET11:22:56

1999AJ....117..908K - Astron. J., 117, 908-919 (1999/February-0)

Detection of cold atomic clouds in the Magellanic bridge.

KOBULNICKY H.A. and DICKEY J.M.

Abstract (from CDS):

We report a direct detection of cold atomic hydrogen in the Magellanic Bridge using 21 cm absorption spectroscopy toward the radio source B0312-770. With a maximum absorption optical depth of τ=0.10 and a maximum 21 cm emission brightness temperature of 1.4 K (NHI=1.2x1020 cm–2), this line of sight yields a spin temperature, Ts, between 20 and 40 K. H I 21 cm absorption and emission spectroscopy toward seven other low H I column density sight lines on the periphery of the LMC and SMC reveal absorption toward one additional background radio source behind the SMC with τ=0.03. The data have typical sensitivities of στ=0.005 to 0.070 in absorption and σTB=0.03 K in emission. These data demonstrate the presence of a cold atomic phase, which is probably accompanied by molecular condensations, in the tenuous interstellar medium of the Bridge region. Young OB stars observed in the Magellanic Bridge could form in situ from these cold condensations rather than migrate from regions of active star formation in the main body of the SMC. The existence of cold condensations and star formation in the Magellanic Bridge might be understood as a small-scale version of the mechanism that produces star formation in the tidal tails of interacting galaxies.

Abstract Copyright:

Journal keyword(s): Galaxies: Magellanic Clouds - galaxies: individual (Large Magellanic Cloud, Small Magellanic Cloud) - Galaxies: ISM - ISM: Structure

CDS comments: Table 2: B0743-683 misprint for -673 (= PKS 0743-673).

Simbad objects: 16

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Number of rows : 16

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 NAME Magellanic Stream HVC 00 32 -30.0           ~ 796 1
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10708 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9230 1
4 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5072 1
5 ICRF J020213.6-762003 Sy1 02 02 13.6940093296 -76 20 03.062346923   16.95 16.90     ~ 93 1
6 2MASX J02430962-7216476 Sy1 02 43 09.6128590493 -72 16 48.432281446 15.43 16.34 15.86 16.14   ~ 20 0
7 ICRF J025246.1-710435 G 02 52 46.15578 -71 04 35.2742   19.0 19.0     ~ 84 1
8 NAME Magellanic Bridge HI 03 11 -77.5           ~ 320 1
9 QSO J0311-7651 BLL 03 11 55.2500768688 -76 51 50.846014733 15.27 16.09 16.10 15.33   ~ 207 1
10 QSO B0506-612 QSO 05 06 43.9895985805 -61 09 40.990800300   17.16 16.85 16.9   ~ 163 2
11 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14544 1
12 QSO J0635-7516 QSO 06 35 46.5080299 -75 16 16.815501   15.96 15.75 15.82   ~ 504 1
13 QSO J0743-6726 QSO 07 43 31.61163970 -67 26 25.5464081   16.71 16.37     ~ 135 1
14 ICRF J193925.0-634245 Sy2 19 39 25.02671 -63 42 45.6255   18.87 18.37 17.64   ~ 936 1
15 ICRF J230343.5-680737 Sy1 23 03 43.5650270994 -68 07 37.443084908   16.26 16.38 17.68   ~ 74 1
16 QSO B2353-686 QSO 23 56 00.6812809892 -68 20 03.471135697   17.61 17.00 16.97   ~ 74 1

    Equat.    Gal    SGal    Ecl

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2020.02.21-11:22:56

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