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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
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) 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 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). 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
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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