J/A+A/365/1 HI observations of LSB galaxies (Matthews+, 2001)
HI observations of giant low surface brightness galaxies
Matthews L.D., van Driel W., Monnier-Ragaigne D.
<Astron. Astrophys. 365, 1 (2001)>
=2001A&A...365....1M 2001A&A...365....1M
ADC_Keywords: Galaxies, radio ; Radial velocities ; H I data
Keywords: galaxies: distances and redshifts - galaxies: general -
galaxies: ISM - radio lines: galaxies
Abstract:
We have used the Nancay Radio Telescope to obtain new global HI data
for 16 giant low surface brightness (LSB) galaxies. Our targets have
optical luminosities and disk scale lengths at the high end for spiral
galaxies (LB∼1010L☉ and hr>6kpc for H0=75km/s/Mpc), but
they have diffuse stellar disks, with mean disk surface brightnesses
>1 magnitude fainter than normal giant spirals. Thirteen of the
galaxies previously had been detected in HI by other workers, but the
published HI observations were either confused, resolved by the
telescope beam, of low signal-to-noise, or showed significant
discrepancies between different authors. For the other 3 galaxies, no
HI data were previously available. Several of the galaxies were
resolved by the Nancay 3.6' E-W beam, so global parameters were
derived from multiple-point mapping observations. Typical HI masses
for our sample are >1010M☉, with MHI/LB=0.3-1.7 (in solar
units). All of the observed galaxies have published optical surface
photometry, and we have compiled key optical measurements for these
objects from the literature. We frequently find significant variations
among physical parameters of giant LSB galaxies reported by various
workers.
Description:
File table2 contains newly measured HI parameters for the program
galaxies. Table 4 contains additional derived quantities based on the
new data.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 66 16 New measured global HI parameters
table4.dat 47 16 Derived HI parameters
tables.tex 77 156 LaTeX version of the tables
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Name of the source
11 A1 --- n_Name [*] Note on Name (1)
13- 16 F4.2 mJy rms rms
18- 22 F5.1 mJy Fmax Peak flux density
24- 26 I3 km/s W20 Raw line width at 20% peak maximum
27 A1 --- u_W20 Uncertainty flag on W20 (2)
29- 31 I3 km/s W50 Raw line width at 50% peak maximum
32 A1 --- u_W50 Uncertainty flag on W50 (2)
34- 38 I5 km/s HRV Heliocentric radial velocity
40- 41 I2 km/s e_HRV Error on radial velocity measurement
43- 47 F5.2 Jy.km/s SHI Integrated HI line flux
49- 52 F4.2 Jy.km/s e_SHI Error on integrated HI line flux
54- 57 F4.1 --- S/N Signal-to-noise
59- 66 A8 --- Notes Notes
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Note (1): An asterisk (*) indicates a galaxy whose parameters were determined
from mapping observations
Note (2): A colon (:) indicates possible uncertainties in the measurement
above the formal error
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Name of the source
11 A1 --- n_Name Note on Name (1)
13- 15 I3 km/s W20c Corrected HI linewidth at 20% peak maximum
17- 19 I3 km/s W50c Corrected HI linewidth at 50% peak maximum
21- 25 I5 km/s VLSR Radial velocity corrected to Local Rest Frame
27- 31 F5.1 Mpc Dist Distance
33- 37 F5.2 [solMass] logMHI Logarithm of HI mass
39- 42 F4.2 Sun MHI/LB Ratio of HI mass to blue luminosity
44- 46 F3.1 arcmin DHI ? Estimated HI diameter
47 A1 --- u_DHI Uncertainty flag on DHI (2)
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Note (1): An asterisk indicates a galaxy whose parameters were determined
from mapping observations
Note (2): A colon (:) indicates high uncertainties in the measurement
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Acknowledgements: Lynn Matthews
(End) Patricia Bauer [CDS] 06-Oct-2000