2008ApJ...688..290F


Query : 2008ApJ...688..290F

2008ApJ...688..290F - Astrophys. J., 688, 290-305 (2008/November-3)

H I clouds in the lower halo. I. The Galactic All-Sky Survey pilot region.

FORD H.A., McCLURE-GRIFFITHS N.M., LOCKMAN F.J., BAILIN J., CALABRETTA M.R., KALBERLA P.M.W., MURPHY T. and PISANO D.J.

Abstract (from CDS):

We have detected over 400 H I clouds in the lower halo of the Galaxy within the pilot region of the Galactic All-Sky Survey (GASS), a region of the fourth quadrant that spans 18° in longitude, 40° in latitude, and is centered on the Galactic equator. These clouds have a median peak brightness temperature of 0.6 K, a median velocity width of 12.8 km/s, and angular sizes ≲1°. The motion of these clouds is dominated by Galactic rotation with a random cloud-to-cloud velocity dispersion of 18 km/s. A sample of clouds likely to be near tangent points was analyzed in detail. These clouds have radii on the order of 30 pc and a median H I mass of 630 M. The population has a vertical scale height of 400 pc and is concentrated in Galactocentric radius, peaking at R=3.8 kpc. This confined structure suggests that the clouds are linked to spiral features, while morphological evidence that many clouds are aligned with loops and filaments is suggestive of a relationship with star formation. The clouds might result from supernovae and stellar winds in the form of fragmenting shells and gas that has been pushed into the halo rather than from a galactic fountain.

Abstract Copyright:

Journal keyword(s): Galaxies: Structure - Galaxy: Halo - ISM: Clouds - ISM: Structure - Radio Lines: ISM

VizieR on-line data: <Available at CDS (J/ApJ/688/290): table1.dat table2.dat>

Nomenclature: Table 1: [FML2008] LLL.ll+BB.bb N=403.

Errata: erratum vol. 710, p. 1868 (2010)

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 281 HII 00 52 25.1 +56 33 54           ~ 234 1
2 NAME Per Arm PoG 03 30 +45.0           ~ 1331 0
3 [H68] L HVC 15 06.4 -15 30           ~ 16 0
4 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12382 0
5 NAME LLIV Arch PoC ~ ~           ~ 20 0

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2021.09.22-13:45:39

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