J/ApJ/688/237 Disk corrugations in IC 2233 (Matthews+, 2008)
Corrugations in the disk of the edge-on spiral galaxy IC 2233.
Matthews L.D., Uson J.M.
<Astrophys. J., 688, 237-244 (2008)>
=2008ApJ...688..237M 2008ApJ...688..237M
ADC_Keywords: Galaxies, IR ; Ultraviolet ; H I data ; Interstellar medium
Keywords: galaxies: individual (IC 2233) - galaxies: spiral -
galaxies: structure - instabilities - ISM: structure
Abstract:
We recently reported the discovery of a regular corrugation pattern
in the HI disk of the isolated, edge-on spiral galaxy IC 2233. Here
we present measurements of the vertical structure of this galaxy at
several additional wavelengths, ranging from the far-ultraviolet to
the far-infrared. We find that undular patterns with amplitude
≲5"(≲250pc) are visible in a variety of Population I tracers in
IC 2233, including the young to intermediate-age stars, the HII
regions, and the dust. However, the vertical excursions become less
pronounced in the older stellar populations traced by the mid-infrared
light. This suggests that the process leading to the vertical
displacements may be linked with the regulation of star formation in
the galaxy. We have also identified a relationship between the
locations of the density corrugations and small-amplitude (≲5km/s)
velocity undulations in the HI rotation curve. We are able to exclude
several possible mechanisms for the origin of the observed
corrugations, including tidal interaction from a companion, Parker
instabilities, or a galactic bore. Global gravitational instabilities
appear to be the most likely explanation, although local perturbations
may also be important.
Objects:
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RA (2000) DE Designation(s)
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08 13 58.8 +45 44 42 IC 2233 = 2MASX J08135890+4544317
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 107 11 Data sets used for vertical structure analysis
of IC 2233
table2.dat 31 309 IC 2233 corrugation curves (systematic
displacements of the mean plane of the galaxy)
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See also:
J/ApJS/173/185 : GALEX ultraviolet atlas of nearby galaxies (Gil de Paz+, 2007)
J/A+A/442/137 : HI observations of WHISP disk galaxies (Noordermeer+, 2005)
J/A+A/408/873 : Gas and stellar kinematics in spirals (Corsini+, 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Desc Wavelength descriptor of the observation
8 A1 --- f_Desc [ab] corrections applied (1)
10- 25 A16 --- Band Wavelength interval (with unit)
27- 38 A12 --- Tel Telescope
40- 43 F4.1 arcsec FWHM FWHM PSF
45 I1 --- Ref Reference (2)
47-107 A61 --- Com Dominant components traced
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Note (1): Flags as follows:
a = Continuum-subtracted; includes a modest (<10%) contribution from [NII].
b = Data are uncorrected for the contribution from stellar photospheric
emission.
Note (2): References as follows:
1 = Gil de Paz et al. 2007, Cat. J/ApJS/173/185;
2 = Matthews & Uson, 2008AJ....135..291M 2008AJ....135..291M (MU08);
3 = L. D. Matthews & K. Wood 2008, in preparation.
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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- 9 A9 --- Band Wavelength of the observation (See table 1)
11- 17 F7.2 arcsec x Major axis distance (1)
19- 24 F6.2 arcsec z Vertical displacement
26- 31 F6.3 arcsec e_z The 1σ uncertainty in z
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Note (1): With respect to the kinematic center:
The position angle for the galaxy was taken to be 172°, and the
adopted center of the galaxy, (x,z)=(0,0), was the kinematic center
established by Matthews & Uson (2008AJ....135..291M 2008AJ....135..291M):
J081358.9+454427.0. Here x is the distance along the galaxy major
axis, with values increasing toward the north, and z is taken as the
distance above the midplane, with positive values to the east. See
section 2.1 for further details.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 13-Jan-2011