J/A+A/319/67 HI observations of dwarf galaxies in voids (Huchtmeier+ 1997)
HI observations of dwarf galaxies in voids
Huchtmeier W.K., Hopp U., Kuhn B.
<Astron. Astrophys. 319, 67 (1997)>
=1997A&A...319...67H 1997A&A...319...67H (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, optical ; H I data; Magnitudes ; Redshifts ;
Keywords: surveys - galaxies; ISM; distances and redshifts -
large-scale-structure - galaxies: interactions - radio lines: galaxies
Abstract:
We report HI-observations of a sample of 43 optically selected
galaxies from the Heidelberg-void project. Only emission-line galaxies
have been selected. The HI-detection rate was 67%. The observed sample
is a mix in late-type morphology objects with a spread in luminosity.
They were compared to other samples with similar selection effects and
mixtures. The detected galaxies have a high HI content and their
MHI/LB values are systematically higher than expected from a local
field comparison sample. Especially, for the 10 dwarfs in our sample
(8.2≤logLB≤9.2) which appear to be highly isolated, a mean
MHI/LB=1.8 was derived which is higher than for all comparison
samples, including those with the same restricted luminosity range. We
discuss a trend in our data between the relative HI-content and the
surrounding galaxy density holding from very high densities
(Virgo-cluster) to the very isolated objects at the rims of the voids.
We also present HI observations of 7 HII-galaxies of the University of
Michigan (UM) sample.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 78 50 Optical data
table2 63 50 HI-observations of dwarf galaxies in voids
tables.tex 81 351 LaTeX version of the tables
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Galaxy name
15- 16 I2 h RAh Optical right ascension (1950.0)
18- 19 I2 min RAm Optical right ascension (1950.0)
21- 24 F4.1 s RAs Optical right ascension (1950.0)
26 A1 --- DE- Declination sign
27- 28 I2 deg DEd Optical declination (1950.0)
30- 31 I2 arcmin DEm Optical declination (1950.0)
33- 34 I2 arcsec DEs Optical declination (1950.0)
36- 40 F5.2 mag mB ? Apparent blue magnitude
42- 46 F5.2 mag mR ? Apparent red magnitude
48- 49 I2 arcsec a25 ? Blue major axis at a surface brightness
of 25 mag/arcsec^2
51- 52 I2 arcsec b25 ? Blue minor axis at a surface brightness
of 25 mag/arcsec^2
54- 60 F7.5 --- z Redshift
62- 68 F7.5 --- e_z ? rms uncertainty on z
70- 76 A7 --- MClass Morphological classification (1)
78 I1 --- gd ?Parameter describing the galaxian density (2)
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Note (1): Morphological classification deviates from the usual system :
lsb marks a low-surface-brightness object,
S marks a disk galaxy which can not be classified in more detail.
ed is an edge-on disk.
Note (2): 1 cluster; 2 sheet; 3 rim of sheet;
4 transition sheet-void; 5 rim of void; 6 void
Individual notes:
CGCG0021+1358 - edge-on spiral of similar size at 3.9'
O0823-055 - E-type galaxy at 5.2'
CGCG1022-0036 - in group of four galaxies of similar size at 1.5', 4.6',
and 6.9'; interaction with closest neighbour?
O0467-106 - spiral of similar size at 3.5'
O0467-023 - spiral of similar size at 3'
O0467-009 - elliptical galaxy at 1.8', foreground?
VN2#274 - VN2#K363 at 4.4', and a small (10") background spiral
VN2#253 at 3.6'
VN2#KOW363 - VN2#274 at 4.4'
VN4#109 - CGCG1305+3421 (elliptical) at 2.6'
VN4#080 - UGC8227 at 5.7'
VN4#071 - nearby spiral VN#70 with different z (0.065) at 1.3'
CGCG1305+3421 - VN4#109 at 2.6'
CGCG1305+3416 - dE companion
UGC8227 - VN4#080 at 5.7' , VN4#069 at 4.4'
A2151-0033 - three spirals at 4.2', 4.9', and 6.4'
A2151-0035 - A2151-0035 at 4.5', other spirals at 3.7', and 2.6'
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 3 A3 --- ID Identification number
5- 17 A13 --- Name Galaxy name
19- 22 F4.2 Jy.km/s Stot ? Total line flux
24- 27 F4.1 mJy Smax ? Peak flux
29- 31 F3.1 mJy e_Smax rms uncertainty on Smax
33- 37 I5 km/s HRV ? HI-line heliocentric radial velocity (1)
39- 40 I2 km/s e_HRV ? rms uncertainty on HRV
42- 44 I3 --- LW50 ? Observed line width at a level of 50%
46- 48 I3 --- LW25 ? Observed line width at a level of 25%
50- 52 I3 --- LW20 ? Observed line width at a level of 20%
54- 58 F5.2 10+9solMass MHI ? Total HI-mass
60- 63 F4.2 Sun MHI/LB ? MHI/LB ratio
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Note (1): Mean of the two midline velocities at a level
of 25% and 20% of the peak.
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Acknowledgements: Walter Huchtmeier
(End) Patricia Bauer [CDS] 19-Feb-1997