J/A+A/229/362 Small-scale structures in HI hole of M33 (Deul+, 1990)
Small-scale structures in the HI distribution of M 33.
Deul E.R., den Hartog R.H.
<Astron. Astrophys. 229, 362 (1990)>
=1990A&A...229..362D 1990A&A...229..362D
ADC_Keywords: Interstellar medium ; H I data ; Morphology
Keywords: galaxies: general - galaxies: structure of -
interstellar medium: bubbles - interstellar medium: general -
radio lines: 21-cm
Abstract:
Recent high-resolution HI observations of M33 reveal a large number
of regions that are devoid of emission. We interpret these regions
as holes formed by interstellar winds; a catalogue containing 148
of these HI holes has been compiled. Their diameters range from the
survey resolution limit (>40pc) to 1kpc. The swept-up mass, estimated
from surrounding HI densities, ranges from 103M☉ to
107M☉. Energies needed to excavate such holes are between
1049 to 1054erg. Indicative ages, based on derived expansion
velocities and diameters, show a cutoff near 7x106yr. Three
statistical analysis techniques are applied to determine positional
correlation of the H I holes with H II regions, OB associations, and
supernova remnants.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 106 148 Properties of the H I holes in the catalogue
table2.dat 28 202 Overlap properties of the H I holes with respect
to the H II regions and OB associations
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- [DD90] Sequential number of the hole
5- 10 F6.3 deg RAdeg Right ascension in decimal degrees (B1950)
12- 17 F6.3 deg DEdeg Declination in decimal degrees (B1950)
19- 24 F6.3 kpc R Distance to the HI hole with respect to the
M33 center (1)
26- 30 F5.1 deg theta Orientation angle of the HI hole in the
galaxy with respect to the north
equatorial pole, with positive sense in
the anti-clockwise direction
32- 35 I4 km/s HRV Radial heliocentric velocity of maximum
contrast
37- 39 I3 km/s DV Expansion velocity (to an accuracy of 2km/s)
41- 44 F4.2 --- Cont Hole contrast defined as
Cont=I(surr)-I(50%)/I(surr)
46- 47 I2 --- T [1/3] Type of Hole (in Fig.1 of paper):
1=gap, 2=shift, 3=depression
49- 50 I2 --- Q Quality of detection (-1 met for the hole)
53 A1 --- C [cp] complete/partial classification code (2)
56- 58 I3 pc Min Extent of the minor axis of the ellipse
that can be fitted to the 50% intensity
contour of a hole
60- 63 I4 pc Maj Extent of the major axis of the ellipse
that can be fitted to the 50% intensity
contour of a hole
65- 68 I4 pc Diam Diameter of the hole, Diam=(Min+Maj)1/2
71- 75 F5.3 --- eps Eccentricity of the hole
77- 79 I3 deg PA [-90/90] Position angle of the major axis
of the ellipse fitted
82- 85 F4.1 Gyr Age Kinematic age assuming a constant
expansion velocity
87- 91 F5.2 cm-3 nHI Ambiant density derived from the observed
total column densities for the HI material
surrounding the hole
93- 98 F6.1 10+4Msun Mass Mass assuming that nHi equals the pre-hole
density and a spherical hole.
101-106 F6.1 10+43J Energy Energy needed to create the hole (x1050ergs)
--------------------------------------------------------------------------------
Note (1): We have used the central position from table1 of Deul and
van der Hulst (1987A&AS...67..509D 1987A&AS...67..509D)
Note (2): Classification code as follows:
c = holes that show a clear elliptical shape over more than 90% of
the outline
p = partial
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- [DD90] Sequential number of the hole
6- 11 A6 --- HII Name of the HII region, CPSDP, Courtes et al.,
1987, Cat. J/A+AS/131/317
14 I1 --- EM [1-4]? Emission measure code (1)
17 I1 --- HI [1-3]? HI-HII code (2)
20- 22 I3 --- OB ? OB association number, [HS80], Humphreys &
Sandage, 1980ApJS...44..319H 1980ApJS...44..319H
25 I1 --- HI-OB [1-3]? HI-OB code (2)
28 I1 --- HII-OB [1-3]? HII-OB code (2)
--------------------------------------------------------------------------------
Note (1): The EM code is taken from the H II region catalogue of Boulesteix
et al. (1974A&A....37...33B 1974A&A....37...33B). 1 (faint) to 4 (extremely strong) on a
logarithmic scale
Note (2): The HI-HII, HI-OB, and HII-OB overlap codes are defined as follows :
1 = 100% overlap (e.g. generally the HII regions lies within the HI hole)
2 = between 100% and 50% overlap
3 = between 50% and no overlap
--------------------------------------------------------------------------------
History:
Prepared via OCR at CDS.
(End) James Marcout, Patricia Vannier [CDS] 10-Jan-2005