J/ApJ/770/L4 HI clouds around the Galactic Center (McClure-Griffiths+, 2013)
Atomic hydrogen in a Galactic Center outflow.
McClure-Griffiths N.M., Green J.A., Hill A.S., Lockman F.J., Dickey J.M.,
Gaensler B.M., Green A.J.
<Astrophys. J., 770, L4 (2013)>
=2013ApJ...770L...4M 2013ApJ...770L...4M
ADC_Keywords: Diffuse clouds ; H I data ; Milky Way ; Surveys
Keywords: Galaxy: center; ISM: clouds
Abstract:
We describe a population of small, high-velocity, atomic hydrogen
clouds, loops, and filaments found above and below the disk near the
Galactic center. The objects have a mean radius of 15pc, velocity
widths of ∼14km/s, and are observed at |z| heights up to 700pc. The
velocity distribution of the clouds shows no signature of Galactic
rotation. We propose a scenario where the clouds are associated with
an outflow from a central star-forming region at the Galactic center.
We discuss the clouds as entrained material traveling at ∼200km/s in a
Galactic wind.
Description:
The Australia Telescope Compact Array (ATCA) HI Galactic Center Survey
(McClure-Griffiths et al. 2012ApJS..199...12M 2012ApJS..199...12M) covers Galactic
latitude -5°≤b≤+5° over the velocity range
-309km/s≤VLSR≤+349km/s with a velocity resolution of 1km/s, an
angular resolution of 145", and a mean rms HI brightness temperature
of σTb=0.7K. The ATCA observations were conducted between 2002
December and 2004 March.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 59 86 Compact clouds catalog observed in HI with the
Australia Telescope Compact Array (ATCA)
(table from erratum published in
2019 ApJL, 884, L27)
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See also:
J/A+A/549/A130 : YSOs in Herschel-Hi-GAL survey (Veneziani+, 2013)
J/ApJ/722/367 : HI clouds in Quadrant I of the Milky Way (Ford+, 2010)
J/ApJ/688/290 : GASS HI survey of the lower halo (Ford+, 2008)
J/ApJ/626/887 : HI clouds in Southern Galactic Plane Survey (Kavars+, 2005)
J/ApJS/140/331 : High-velocity HI observations at 21cm (Lockman+, 2002)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name Cloud name
16- 21 F6.2 deg GLON Galactic longitude
23- 27 F5.2 deg GLAT [-5/5] Galactic latitude
29- 34 F6.1 km/s Vlsr [-209.3/201] Local Standard of Rest velocity
36- 39 F4.1 K Tb [1.4/14.2] Fitted peak brightness temperature
41- 44 F4.1 km/s Dv [1/31] Velocity full-width at half-maximum
46- 49 F4.1 10+19/cm2 NH [1/35] Maximum hydrogen column density
51- 54 I4 Msun Mcl [5/2190] Cloud mass
56- 59 F4.1 pc r [3.5/33] Mean cloud radius (with R☉=8.5kpc)
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History:
From electronic version of the journal
14-Feb-2015: Insert into VizieR
30-Oct-2019: Values for G1.4-1.8+87 corrected in Table 1,
from erratum published in 2019 ApJL, 884, L27.
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 13-Jan-2015