J/A+AS/137/419 Dynamics of blue compact galaxies I. The data (Oestlin + 1999)
Dynamics of blue compact galaxies as revealed by their H-alpha velocity fields.
I. The data, velocity fields and rotation curves.
Oestlin G., Amram P., Masegosa J., Bergvall N., Boulesteix J.
<Astron. Astrophys. Suppl. Ser. 137, 419 (1999)>
=1999A&AS..137..419O 1999A&AS..137..419O (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, rotation ; Rotational velocities
Keywords: galaxies: compact - galaxies: starburst -
galaxies: kinematics and dynamics - galaxies: interactions -
galaxies: ISM
Abstract:
Observations of six luminous blue compact galaxies (BCGs) and two star
forming companion galaxies were carried out with the CIGALE scanning
Fabry-Perot interferometer attached to the ESO 3.6m telescope on La
Silla. The observations were made in the H-alpha emission line which
is prominent in BCGs. A velocity sampling of 5km/s and a pixel size of
0.9arcseconds were used. In this paper we present the observations and
the data together with the velocity fields and the derived rotation
curves. In addition we provide rough estimates of the total dynamical
mass and of the ionised gas mass for each galaxy. All galaxies display
rotation, but while the companion galaxies have regular velocity
fields, those of the BCGs are complex and appear perturbed. This is
the most extensive study to date of the optical velocity fields of
BCGs. The interpretation of these results will be presented in a
forthcoming paper (Paper II).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 54 170 Rotation curves
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See also:
J/ApJ/511/639 : Abundances in blue compact galaxies (Izotov+, 1999)
J/A+AS/139/1 : HI in Byurakan blue comact galaxies (Thuan+, 1999)
J/A+AS/147/169 : Accurate positions of 2978 SBS objects (Bicay+, 2000)
J/A+A/373/24 : Blue compact galaxies from SBS (Pustilnik+ 2001)
Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Galaxy name
14- 19 A6 --- Model ? Model version (1)
21- 24 F4.1 arcsec Rad Mean radius of the annulus on the major axis
26- 27 I2 --- o_Vapp Number of points for the approaching side (2)
29- 31 I3 km/s Vapp ? Weighted average velocity for approaching side
33- 34 I2 km/s e_Vapp ? rms uncertainty on Vapp
36- 37 I2 --- o_Vrec Number of points for the receding side (2)
39- 41 I3 km/s Vrec ? Weighted average velocity for receding side
43- 44 I2 km/s e_Vrec ? rms uncertainty on Vrec
46- 47 I2 --- o_Vtot Total Number of points = o_Vapp + o_Vrec
49- 51 I3 km/s Vtot Weighted average velocity for both sides
53- 54 I2 km/s e_Vtot rms uncertainty on Vtot
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Note (1): Some galaxies have been modelled in different ways, e.g. decomposing
the velocity field (VF) into two components. When present the label
Model indicates which model the rotation curve (RC) refers to.
Total = RC built from the non decomposed velocity field
1st = RC built from the first component of the decomposed VF
2nd = RC built from the second component of the decomposed VF
Main = RC built from the main component of the non decomposed VF
FP1 = RC built from observations with Fabry-Perot interferometer 1
Masked = RC built after masking points in the non decomposed VF
East = RC refers to the first component of the eastern galaxy
West = RC refers to the first component of the western galaxy
For further explanations of the different models see paper.
Note (2): The number of velocity points included in calculating the velocity
at the given radius
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Acknowledgements: Goran Ostlin
(End) Patricia Bauer [CDS] 25-Feb-1999