J/A+AS/131/105 NGC 6221 ionized gas kinematics (Vega Beltran+ 1998)
Mixed early and late-type properties in the bar of NGC 6221:
evidence for evolution along the Hubble sequence?
Vega Beltran J.C., Zeilinger W.W., Amico P., Schultheis M.,
Corsini E.M., Funes J.G., Beckman J., Bertola F.
<Astron. Astrophys. Suppl. Ser. 131, 105 (1998)>
=1998A&AS..131..105V 1998A&AS..131..105V (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, Seyfert ; Velocity dispersion
Keywords: galaxies: individual: NGC 6221 - galaxies: kinematics and dynamics -
galaxies: structure - galaxies: evolution - galaxies: spiral
Abstract:
Rotation curves and velocity dispersion profiles are presented for
both the stellar and gaseous components along five different position
angles (PA =5°, 50°, 95°, 125°, and 155°) of the
nearby barred spiral NGC 6221. The observed kinematics extends out to
about 80'' from the nucleus. Narrow and broad-band imaging is also
presented. The radial profiles of the fluxes ratio [NII] (λ
6583.4Å)/Hα reveal the presence of a ring-like structure of
ionized gas, with a radius of about 9'' and a deprojected circular
velocity of about 280km/s. The analysis of the dynamics of the bar
indicates this ring is related to the presence of an inner Lindblad
resonance (ILR) at 1.3kpc. NGC 6221 is found to exhibit intermediate
properties between those of the early-type barred galaxies: the
presence of a gaseous ring at an ILR, the bar edge located between the
ILR's and the corotation radius beyond the steep rising portion of the
rotation curve, the dust-lane pattern, and those of the late-type
galaxies: an almost exponential surface brightness profile, the
presence of Hα regions along all the bar, the spiral-arm
pattern. It is consistent with scenarios of bar-induced evolution from
later to earlier-type galaxies.
Objects:
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RA (2000) DE Designation(s)
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16 52 47 -59 13.0 NGC 6221
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 68 51 Stellar kinematics for PA: 5, 50, 95, 125 & 155°
table4.dat 71 55 Ionized gas kinematics for PA=5 (Major Axis)
table5.dat 71 108 Ionized gas kinematics for PA=50
table6.dat 71 122 Ionized gas kinematics for PA=95 (Minor Axis)
table7.dat 71 81 Ionized gas kinematics for PA=125 (Bar Major Axis)
table8.dat 71 78 Ionized gas kinematics for PA=155
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See also:
J/A+A/360/439 : Stellar and ionized gas kinematics in NGC 4672 (Sarzi+, 2000)
J/A+A/374/394 : Gas and stars kinematics in disc galaxies (Vega Beltran+ 2001)
J/A+AS/105/433 : Kinematical data of 14 early-type galaxies (Longo+ 1994)
J/A+AS/133/317 : Stellar kinematics in spiral galaxies (Heraudeau+ 1998)
J/A+AS/136/509 : Stellar kinematics in spiral galaxies. II. (Heraudeau+ 1999)
J/A+AS/122/521 : Kinematical data on early-type galaxies. I. (Simien+ 1997)
J/A+AS/126/15 : Kinematical data on early-type galaxies. II. (Simien+ 1997)
J/A+AS/126/519 : Kinematical data on early-type galaxies. III. (Simien+ 1997)
J/A+AS/131/287 : Kinematical data on early-type galaxies. IV. (Simien+ 1998)
J/A+AS/145/263 : Kinematical data on early-type galaxies. V. (Simien+, 2000)
J/A+AS/127/117 : Kinematics of galaxies (Prugniel+ 1998)
J/A+A/382/488 : Stellar and ionized gas kinematics in NGC 2855 (Corsini+ 2002)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 deg PA Position angle
6- 10 F5.1 arcsec Rad [-90/90] Radius
15- 18 I4 km/s Vel Velocity
22- 23 I2 km/s e_Vel Velocity error
27- 29 I3 km/s sigmaVel Velocity dispersion
32- 33 I2 km/s e_sigmaVel Velocity dispersion error
38- 43 F6.3 --- h3 h3 Gauss-Hermite coefficient
46- 50 F5.3 --- e_h3 h3 Gauss-Hermite coefficient error
55- 60 F6.3 --- h4 h4 Gauss-Hermite coefficient
63- 67 F5.3 --- e_h4 h4 Gauss-Hermite coefficient error
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Byte-by-byte Description of file: table[45678].dat
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Bytes Format Units Label Explanations
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1- 5 F5.1 arcsec Rad [-90/90] Radius
9- 12 I4 km/s HVHa Hα observed heliocentric velocity
16- 17 I2 km/s e_HVHa Hα observed heliocentric velocity error
21- 23 I3 km/s sigmaHVHa Hα velocity dispersion
28- 31 I4 km/s HVNII Observed [NII] heliocentric velocity
35- 36 I2 km/s e_HVNII Observed [NII] heliocentric velocity error
40- 42 I3 km/s sigmaHVNII velocity dispersion of [NII]
46- 49 F4.2 --- [NII]/Ha Flux ratio [NII]/Hα
53- 56 I4 km/s HV Averaged ionized gas heliocentric velocity
60- 61 I2 km/s e_HV Averaged ionized gas velocity error
65- 67 I3 km/s sigmaHV Averaged velocity dispersion
70- 71 I2 km/s e_sigmaHV Averaged velocity dispersion error
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Acknowledgements: Juan Carlos Vega
(End) Patricia Bauer [CDS] 24-Feb-1998