Access to Astronomical Catalogues

← Click to display the menu
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
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:
FileName Lrecl Records Explanations
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
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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
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
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
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)
Note (1): An asterisk indicates a galaxy whose parameters were determined from mapping observations Note (2): A colon (:) indicates high uncertainties in the measurement
Acknowledgements: Lynn Matthews
(End) Patricia Bauer [CDS] 06-Oct-2000
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

catalogue service

© UDS/CNRS

Contact