J/A+A/482/53 Radial velocities of four LSB galaxies (Pizzella+, 2008)
Detection of non-ordered central gas motions in a sample of four low surface
brightness galaxies.
Pizzella A., Tamburro D., Corsini E.M., Bertola F.
<Astron. Astrophys. 482, 53 (2008)>
=2008A&A...482...53P 2008A&A...482...53P
ADC_Keywords: Galaxies, peculiar ; Radial velocities ; Velocity dispersion
Keywords: galaxies: kinematics and dynamics - galaxies: spiral -
galaxies: structure - cosmology: dark matter
Abstract:
We present integral-field spectroscopy of the ionized gas in the
central regions of four galaxies with a low surface brightness disk
taken with the Visible Multi Object Spectrograph at the Very Large
Telescope and aimed at testing the accuracy in the determination of
the central logarithmic slope alpha of the mass density radial
profile rho(r)∝ralpha in this class of objects.
For all the sample galaxies we subtracted the best-fit model of gas in
circular motions from the observed velocity field and derived the
residuals. Only ESO-LV5340200 is characterized by a regular velocity
field. We extracted the velocity curves of this galaxy along several
position angles, in order to estimate the uncertainty in deriving the
central gradient of the total mass density from long-slit
spectroscopy.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 69 4 Observing log
table2.dat 35 4730 Velocity and velocity dispersion field of the
four sample galaxies
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See also:
VII/115 : Surface Photometry of ESO-Uppsala Galaxies (Lauberts+ 1989)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- ESO-LV ESO-LV galaxy number (Cat. VII/115)
9- 10 I2 h RAh Right ascension (J2000)
12- 13 I2 min RAm Right ascension (J2000)
15- 18 F4.1 s RAs Right ascension (J2000)
20 A1 --- DE- Declination sign (J2000)
21- 22 I2 deg DEd Declination (J2000)
24- 25 I2 arcmin DEm Declination (J2000)
27- 28 I2 arcsec DEs Declination (J2000)
30- 31 I2 --- Obs.d ? First day of observation if two
observations
32 A1 --- --- [-]
33- 42 A10 "DD/MM/YYYY" ObsDate Observation date
44- 50 A7 --- ExpTime Exposition time
52- 54 F3.1 arcsec FWHM1 ? Instrumental line width for
first observation
55 A1 --- --- [/]
56- 58 F3.1 arcsec FWHM2 ? Instrumental line width for
second observation
60- 69 A10 --- SName Simbad name of galaxy
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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- 7 I7 --- ESO-LV ESO-LV galaxy number
9- 13 F5.2 arcsec Xpos Horizontal position
15- 19 F5.2 arcsec Ypos Vertical position
21- 28 F8.2 km/s RV Observed radial velocity
30- 35 F6.2 km/s sigma Velocity dispersion corrected for
instrumental width
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Acknowledgements:
Alessandro Pizzella, alessandro.pizzella(at)unipd.it
(End) Patricia Vannier [CDS] 10-Apr-2008