J/AJ/124/3157 Velocities in NGC 4449 (Valdez-Gutierrez+, 2002)
Unveiling the kinematics and dynamics of ionized gas in the
nearby irregular galaxy NGC 4449.
Valdez-Gutierrez M., Rosado M., Puerari I., Georgiev L., Borissova J.,
Ambrocio-Cruz P.
<Astron. J. 124, 3157 (2002)>
=2002AJ....124.3157V 2002AJ....124.3157V
ADC_Keywords: Galaxies, photometry ; Photometry, H-alpha ; Radial velocities
Keywords: galaxies: individual (NGC 4449) - galaxies: irregular -
galaxies: ISM - galaxies: kinematics and dynamics - ISM: general
Abstract:
A detailed kinematic analysis of ionized gas in the nearby irregular
galaxy NGC 4449 is presented. Observations were conducted in the
spectral lines of Hα and [S II]. Our scanning Fabry-Perot
interferometric observations are presented from both a global and a
local perspective. We have analyzed the global velocity field, the
spatially extended diffuse gaseous component, and the H II region
populations and, furthermore, have determined the rotation curve based
on the heliocentric radial velocities of the global Hα spatial
distribution.
Description:
The observations were carried out during four runs (1997/Jan/09 and
1998/Jun/20 for Fabry-Perot data, 1997/Jan/10, 1998/Jun/20 and
1999/Feb/11 for direct imaging) with PUMA, the scanning Fabry-Perot
interferometer of the Universidad Nacional de Autonoma de Mexico,
attached to the f/7.9 Ritchey-Chretien focus of the 2.1 m telescope at
the Observatorio Astronsmico Nacional at San Pedro Martir, B.C.,
Mexico.
Objects:
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RA (2000) DE Designation(s)
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12 28 13.1 +44 05 43 NGC 4449
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 60 101 Photometry for the H II regions in NGC 4449
table4.dat 78 84 Measured kinematical parameters for the
H II regions in NGC 4449
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- [VRP2002b] Source identification in this work
[VRP2002b] M1-M101 in Simbad
6- 25 A20 --- OID Other source identifications, separated by
coma (G1)
27- 29 A3 --- VNN VNN number as in table4.dat
30 A1 --- --- [,]
31- 33 A3 --- VNN2 Second VNN number
36- 40 F5.1 pc Diam Equivalent diameter (2)
42- 47 F6.2 [mW/m2] log(FHa) Log of the Hα flux in erg/cm2/s
49- 53 F5.2 [10-7W] log(LHa) Log of the Hα luminosity in erg/s
55- 59 F5.2 [mW/m2/sr] log(SBHa) Log of the Hα surface brightness in
erg/cm2/s/steradian
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Note (2): Defined in terms of the area (A) where the photometry is performed:
A=π(D/2)2.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- VNN Source identification in this work (V1 to V84)
[VRP2002b] VNN in Simbad
5- 27 A23 --- OID Other source identifications (G1) (1)
29- 31 I3 km/s Vel1 First peak Gaussian velocity
33- 37 F5.1 km/s Vel2 ? Second peak Gaussian velocity
39- 42 F4.1 km/s Sigma1 First velocity dispersion (2)
44- 47 F4.1 km/s Sigma2 ? Second velocity dispersion
49- 51 A3 --- NumL Hill et al. (1998ApJ...507..179H 1998ApJ...507..179H)
large aperture star number (3)
53- 54 I2 --- NumS ? Hill et al. (1998ApJ...507..179H 1998ApJ...507..179H)
small aperture star number (3)
58- 77 A20 --- Com Comments (4)
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Note (1): Some relatively isolated H II regions or H II regions being
part of a complex, had low S/N ratios and consequently the
determinations of peak velocity and velocity dispersion were
uncertain. Such cases are marked with a ``u''.
Note (2): From fitting a Gaussian to the radial velocity profiles.
Note (3): A blank space means that there is no indication of a young
stellar population in Hill's data, or that some of our regions were
not covered by their observations.
Note (4): Comments:
a = asymmetric profile; s = symmetric profile.
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Global notes:
Note (G1): The identification numbers as those of Sabbadin & Bianchini,
1979PASP...91..280S 1979PASP...91..280S, [SB79b] NNN in Simbad. Two other regions not
catalogued in this work are demarcated as h61 and h66 according to
Hodge (1969ApJS...18...73H 1969ApJS...18...73H, [H69] NGC 4449 61 and [H69] NGC 4449 66 in
Simbad).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 06-Feb-2003