J/A+A/593/A40 Kinematical profiles of nearby galaxies (Vudragovic+, 2016)
Full stellar kinematical profiles of central parts of nearby galaxies.
Vudragovic A., Samurovic S., Jovanovic M.
<Astron. Astrophys. 593, A40 (2016)>
=2016A&A...593A..40V 2016A&A...593A..40V (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Galaxies, spectra ; Morphology
Keywords: catalogs - gravitation - galaxies: spiral -
galaxies: elliptical and lenticular, cD -
galaxies: kinematics and dynamics
Abstract:
We present the largest catalog of detailed stellar kinematics of the
central parts of nearby galaxies, which includes higher moments of the
line-of-sight velocity distribution (LOSVD) function represented by
the Gauss-Hermite series. The kinematics is measured on a sample of
galaxies selected from the Arecibo Legacy Fast ALFA (Alfalfa) survey
using spectroscopy from the Sloan Digital Sky Survey (SDSS DR7).
The SDSS DR7 offers measurements of the LOSVD based on the assumption
of a pure Gaussian shape of the broadening function caused by the
combination of rotational and random motion of the stars in galaxies.
We discuss the consequences of this oversimplification since the
velocity dispersion, one of the measured quantities, often serves as
the proxy to important modeling parameters such as the black-hole mass
and the virial mass of galaxies.
The publicly available pPXF code is used to calculate the full
kinematical profile for the sample galaxies including higher moments
of their LOSVD. Both observed and synthetic stellar libraries were
used and the related template mismatch problem is discussed.
For the whole sample of 2180 nearby galaxies reflecting morphological
distribution characteristic for the local Universe, we successfully
recovered stellar kinematics of their central parts, including higher
order moments of the LOSVD function, for signal-to-noise above 50.
Description:
We have started from the sample of Huertas-Company M. et al.
(2011A&A...525A.157H 2011A&A...525A.157H, Cat. J/A+A/525/A157), that was cross-matched
with GALEX and 2MASS catalogs. We have gathered 2180 galaxies in total
with spectroscopy, and UV to near-IR photometry.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 298 2180 Kinematics of a sample of Alfalfa galaxies
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See also:
J/AJ/142/170 : ALFALFA survey: the alpha.40 HI source catalog (Haynes+, 2011)
J/A+A/525/A157 : SDSS automated morphology classification
(Huertas-Company+, 2011)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- ALFA Source ID as in Haynes et al. (2011,
Cat. J/AJ/142/170), UGC/AGC number
8- 18 F11.7 deg RAdeg Right ascension (J2000)
21- 30 F10.7 deg DEdeg Declination (J2000)
32- 50 I19 --- GALEX Unique ID from GALEX GR6
52- 69 I18 --- pSDSS Unique photometric ID from SDSS DR7
71- 88 I18 --- sSDSS Unique spectroscopic ID from SDSS DR7
90-105 A16 --- 2MASS Unique ID from 2MASS (HHMMSSss+DDMMSSs)
107-115 F9.7 --- z Redshift from the SDSS DR7
117-120 F4.1 --- S/N Signal-to-noise ratio of the spectra
122-127 F6.1 km/s Vemp Empirical velocity dispersion (1)
129-133 F5.1 km/s e_Vemp Empirical velocity dispersion error
135-141 F7.4 --- h3emp Empirical h3 coefficient
143-148 F6.4 --- e_h3emp Empirical h3 coefficient error
150-156 F7.4 --- h4emp Empirical h4 coefficient
158-163 F6.4 --- e_h4emp Empirical h4 coefficient error
165-170 F6.1 km/s Vcemp Empirical corrected velocity dispersion (2)
172-176 F5.1 km/s e_Vcemp Empirical corrected velocity dispersion error
178-183 F6.1 km/s V2emp Empirical Gaussian velocity dispersion (3)
185-189 F5.1 km/s e_V2emp Empirical Gaussian velocity dispersion error
191-196 F6.1 km/s Vsynt Synthetic velocity dispersion (4)
198-202 F5.1 km/s e_Vsynt Synthetic velocity dispersion error
204-210 F7.4 --- h3synt Synthetic h3 coefficient
212-217 F6.4 --- e_h3synt Synthetic h3 coefficient error
219-225 F7.4 --- h4synt Synthetic h4 coefficient
227-232 F6.4 --- e_h4synt Synthetic h4 coefficient error
234-239 F6.1 km/s Vcsynt Synthetic corrected velocity dispersion (5)
241-245 F5.1 km/s e_Vcsynt Synthetic corrected velocity dispersion error
247-252 F6.1 km/s V2synt Synthetic Gaussian velocity dispersion (6)
254-258 F5.1 km/s e_V2synt Synthetic Gaussian velocity dispersion error
260-268 F9.7 --- pE Probability of being an elliptical galaxy
270-278 F9.7 --- pS0 Probability of being a lenticular galaxy
280-288 F9.7 --- pSab Probability of being a spiral Sab galaxy
290-298 F9.7 --- pScd Probability of being a spiral Scd galaxy
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Note (1): Velocity dispersion from the Gauss-Hermite LOSVD function for the
empirical stellar library.
Note (2): Velocity dispersion corrected for the departure from the Gaussian
function for the empirical stellar library.
Note (3): Velocity dispersion for the Gaussian approximation of the LOSVD
function for the empirical stellar library.
Note (4): Velocity dispersion from the Gauss-Hermite LOSVD function for the
synthetic stellar library.
Note (5): Velocity dispersion corrected for the departure from the Gaussian
function for the synthetic stellar library.
Note (6): Velocity dispersion for the Gaussian approximation of the LOSVD
function for the synthetic stellar library.
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Acknowledgements:
Ana Vudragovic, ana(at)aob.rs
(End) Ana Vudragovic [AOB], Patricia Vannier [CDS] 07-Jul-2016