J/ApJS/173/85 HI 21cm forbidden-velocity wings (Kang+, 2007)
Faint H I 21 cm emission line wings at forbidden velocities.
Kang J.-H., Koo B.-C.
<Astrophys. J. Suppl. Ser., 173, 85-103 (2007)>
=2007ApJS..173...85K 2007ApJS..173...85K
ADC_Keywords: Interstellar medium ; Radio lines ; Galactic plane ; H I data
Keywords: ISM: general - ISM: kinematics and dynamics - ISM: structure
radio lines: ISM - supernova remnants
Abstract:
We present the results of a search for faint HI 21cm emission line
wings at velocities forbidden by Galactic rotation in the Galactic
plane using the Leiden/Dwingeloo HI Survey data and the HI Southern
Galactic Plane Survey data. These "forbidden-velocity wings" (FVWs)
appear as protruding excessive emission in comparison with their
surroundings in limited (≳2°) spatial regions over velocity
extents of more than ∼20km/s in large-scale (l,v) diagrams. Their
high velocities imply that there should be some dynamical phenomena
associated. We have identified 87 FVWs. We present their catalog and
discuss their distribution and statistical properties. We found that
85% of FVWs are not coincident with known supernova remnants (SNRs),
galaxies, or high-velocity clouds. Their natures are currently
unknown.
Description:
We used two sets of Galactic HI survey data; the Leiden/Dwingeloo
HI survey (LDS; Hartmann & Burton 1997, Atlas of Galactic Neutral
Hydrogen, Cambridge Univ. Press) and the Parkes survey (Cat. VIII/73),
which is a part of the HI Southern Galactic Plane Survey (SGPS;
McClure-Griffiths 2001, PhD thesis).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 70 87 Catalog of Forbidden-Velocity Wings
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See also:
VIII/73 : HI Parkes All Sky Survey Catalogue (HIPASS) (Meyer+, 2004)
J/A+A/391/159 : A search for Compact High-Velocity Clouds (De Heij+, 2002)
J/A+AS/83/539 : 21cm radio continuum survey. I. (Reich+ 1990)
J/MNRAS/201/495 : HI Survey of Southern Galactic Plane (Strong+ 1982)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [FVW]
4- 13 A10 --- FVW Forbidden-Velocity Wing name (LLL.l+BB.b) (1)
15- 19 F5.1 deg GLON Galactic longitude
21- 25 F5.1 deg GLAT Galactic latitude
27- 30 I4 km/s Vmin Excess HI emission minimum velocity
32- 35 I4 km/s Vmax Excess HI emission maximum velocity
37- 41 F5.1 K.km/s Int Integrated HI intensity (2)
43- 46 F4.1 K.km/s e_Int Uncertainty in Int
48 I1 --- Rank [1/3] Definiteness of protruding feature
rank (3)
50- 70 A21 --- Aobj Associated object
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Note (1): Based on the Galactic coordinates. The central coordinates are
determined in the images integrated over the given velocity extent.
Note (2): Over the given velocity extent at the center of
forbidden-velocity wing.
Note (3): Higher rank means it is more apparent in (l,v) or (b,v) diagram.
See text for further details.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 11-May-2009