J/A+A/550/A23 HI shells in Leiden/Argentina/Bonn HI survey (Ehlerova+, 2013)
HI shells in the Leiden/Argentina/Bonn HI survey.
Ehlerova S., Palous J.
<Astron. Astrophys. 550, A23 (2013)>
=2013A&A...550A..23E 2013A&A...550A..23E
ADC_Keywords: Milky Way ; Interstellar medium ; H I data
Keywords: ISM: bubbles - ISM: general
Abstract:
We analyse the all-sky Leiden/Argentina/Bonn HI survey, where we
identify shells belonging to the Milky Way. We used an identification
method based on the search of continuous regions of a low brightness
temperature that are compatible with given properties of HI shells. We
found 333 shells in the whole Galaxy. The size distribution of shells
in the outer Galaxy is fitted by a power law with the coefficient of
2.6 corresponding to the index 1.8 in the distribution of energy
sources. Their surface density decreases exponentially with a scale
length of 2.8kpc. The surface density of shells with radii >100pc
in the solar neighbourhood is around 4 per kpc2 and the 2D porosity
is around 0.7.
Description:
Table A1 contains observed properties of 333 shells identified in the
Leiden/Argentina/Bonn HI survey. Names of the structures (Col. 2) are
created from galactic coordinates and the radial velocity of their
centres. Columns 3-8 describe the ranges in coordinates, where the
structure is visible: Col. 3 and Col. 4 the longitude, Col. 5 and Col.
6 the latitude, Col. 7 and Col. 8 the radial velocity.
Table A2 contains derived properties of those HI shells from Table 1,
where the kinematic distances could be derived. Column 3 is the
galactocentric distance of the structure, Col. 4 is the radius of the
shell (calculated as the geometric mean of dimensions in l and b),
Col. 5 is the expansion velocity (calculated as a half of the velocity
extent of the structure). Columns 6 and 7 are estimates of the needed
energy input into the shell and the evolutionary time.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 62 333 Observed properties of HI shells
tablea2.dat 54 151 Derived properties of HI shells in the outer Galaxy
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq Sequential number, within the table
5- 7 A3 --- --- [GSH]
8- 24 A17 --- Name Name of the shell (LLL.l+BB.b+VVV.v)
26- 30 F5.1 deg GLON1 Minimum galactic longitude of the shell
32- 36 F5.1 deg GLON2 Maximum galactic longitude of the shell
38- 42 F5.1 deg GLAT1 Minimum galactic latitude of the shell
44- 48 F5.1 deg GLAT2 Maximum galactic latitude of the shell
50- 55 F6.1 km/s RV1 Minimum radial velocity of the shell
57- 62 F6.1 km/s RV2 Maximum radial velocity of the shell
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq Sequential number, within the table
5- 7 A3 --- --- [GSH]
8- 24 A17 --- Name Name of the shell (LLL.l+BB.b+VVV.v)
26- 29 F4.1 kpc Rgc Galactocentric distance of the shell
31- 34 F4.2 kpc Rad Radius of the shell
36- 39 F4.1 km/s Vexp Expansion velocity of the shell
41- 48 E8.2 10+44J/Myr L Estimated energy input (the unit represent
supernovae/million years)
50- 54 F5.1 Myr texp Estimated age
--------------------------------------------------------------------------------
Acknowledgements:
Sona Ehlerova, sona (at)ig.cas.cz
(End) S. Ehlerova [Astron. Inst., ASCR, Czech Rep.] P. Vannier [CDS] 09-Jan-2013