J/A+A/434/887 HI data of blue compact dwarf galaxies (Huchtmeier+, 2005)
HI-observations of blue compact dwarf galaxies. Huchtmeier W.K., Gopal Krishna, Petrosian A. <Astron. Astrophys. 434, 887 (2005)> =2005A&A...434..887H
ADC_Keywords: Galaxies, photometry ; H I data ; Radial velocities ; Morphology Keywords: galaxies: dwarf - galaxies: evolution - galaxies: fundamental parameters Abstract: We present HI-observations of 56 blue compact dwarf (BCD) galaxies of which 44 have been detected in the 21-cm line from neutral hydrogen with the 100-m radiotelescope at Effelsberg. Optical data (e.g., from NED) and HI data from other observers and telescopes are used to estimate the likelihood of confusion from other galaxies within the Effelsberg beam. The selected 29 BCD galaxies without any sign of confusion are used to infer several characteristic properties of the BCD galaxy population. In some respects, they resemble normal galaxies: e.g., the relations between global parameters like linear diameter A0 versus blue luminosity LB and the MHI/LB ratio vs. LB. At least five of these BCDGs emit milli-Jansky level radio continuum emission. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 90 60 Observational data table2.dat 64 44 Derived global parameters for our sample of galaxies
See also: J/A+A/319/67 : HI observations of dwarf galaxies in voids (Huchtmeier+ 1997) J/A+AS/139/1 : HI in Byurakan blue compact galaxies (Thuan+, 1999) J/A+A/366/428 : HI observations of nearby dwarf galaxies (Karachentsev+, 2001) J/A+AS/141/469 : First list of the Karachentsev catalog (Huchtmeier+, 2000) J/A+AS/147/187 : Second list of the Karachentsev catalog (Huchtmeier+, 2000) J/A+A/366/428 : Third list of the Karachentsev catalog (Karachentsev+, 2001) J/A+A/377/801 : Fourth list of the Karachentsev catalog (Huchtmeier+, 2001) J/A+A/429/115 : JHK' photometry of Blue Compact Dwarf Galaxies (Noeske+, 2005) J/ApJS/147/29 : BRHalpha data of blue compact dwarf gal. (Gil De Paz+, 2003) J/AZh/79/867 : Abundances of HII regions in blue galaxies (Holovatyy+, 2002) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Galaxy Galaxy designation 15- 16 I2 h RAh Right ascension (J2000) 18- 19 I2 min RAm Right ascension (J2000) 21- 24 F4.1 s RAs Right ascension (J2000) 26 A1 --- DE- Declination sign (J2000) 27- 28 I2 deg DEd Declination (J2000) 30- 31 I2 arcmin DEm Declination (J2000) 33- 34 I2 arcsec DEs Declination (J2000) 36- 41 A6 --- MType Morphological type (1) 43- 45 I3 arcsec Size1 Optical size (2) 47- 48 I2 arcsec Size2 Optical size (2) 50- 53 F4.1 mag BTmag Total blue apparent magnitude (3) 55- 58 I4 km/s HRVo Optical heliocentric radial velocity 60- 64 F5.2 Jy.km/s FHI ? Measured HI flux 66- 70 F5.1 mJy Speak ? Observed peak flux of the line at 21cm 72- 74 F3.1 mJy e_Speak rms error on Speak (4) 76- 79 I4 km/s HRV ? Heliocentric radial velocity derived from the midpoint of the line at 50% of the peak 81- 82 I2 km/s e_HRV ? rms uncertainty on HRV 84- 86 I3 km/s W50 ? Linewidth at a level of 50% of the line peak 88- 90 I3 km/s W20 ? Linewidth at a level of 20% of the line peak
Note (1): Morphological type: BCD = blue compact dwarfs Int = interacting galaxies Note (2): Optical dimensions corresponding to the blue surface brightness level at 25mag/arcsec2 Note (3): From HYPERLEDA, http://www-obs.univ-lyon1.fr/hypercat/ ; for SBS1331+493 and SBS1428+457 from Doublier et al. (1997A&AS..124..405D) Note (4): For non detections only the rms noise is shown.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Galaxy Galaxy designation 16- 19 I4 km/s V(3Kbgd) Optical heliocentric velocity reduced to the frame of the cosmic microwave background (using NED) 21- 23 I3 Mpc Dist Distance (using H0=72km/s/Mpc) (1) 25- 28 F4.1 kpc Diam Linear diameter, A0,i 30- 34 F5.1 mag BMAG Absolute B magnitude Corrected for Galactic extinction and internal absorption (2) 36- 40 F5.2 10+8solMass MHI Total HI mass 41- 45 F5.1 10+8solMass Mass Total mass 47- 51 F5.2 Sun MHI/LB HImass to B luminosity ratio 53- 57 F5.1 Sun Mass/LB Total mass to B luminosity ratio 59- 62 F4.2 Sun MHI/Mass HI to total mass ratio 64 A1 --- Comm [c] Comments (3)
Note (1): Optical diameter in the D25 system (in table1) have been corrected for absorption and for inclination, where the inclination was derived from the axial ratio assuming an intrinsic axial ratio of 0.2 (e.g. Tully 1985, in view of the uncertainties in these inclinations we did not apply corrections for possible type dependence of the intrinsic axial ratio): log(a0) = loga =0/09Ab =0.2log(a/b), where the foreground absorption in the blue Ab is from Schlegel et al. (1998ApJ...500..525S) (as given in the NED). Note (2): The internal absorption in a galaxy in the B-band, Ai, depends on inclination and luminosity: Ai=[1.6+2.8(logVm-2.2)]*log(a/b) ; Vm≥42.7km/s Ai=0 - other Here we use the following definition of Vm: The HI rotational velocity Vm=W50/(2sini) corrected for inclination and turbulent motion (Tully and Fouque, 1985ApJS...58...67T) with isotropic non-circular motion parameter σz=8km/s. Note (3): A "c" indicates that the HI data are (probably) confused by neighboring galaxies within the antenna beam (Section 4).
Acknowledgements: Walter Huchtmeier, p083huc(at)mpifr-bonn.mpg.de
(End) Patricia Vannier [CDS] 10-Feb-2005
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