J/ApJ/702/1567 Structure of 2MASS edge-on galaxies (Bizyaev+, 2009)
Structural parameters of stellar disks from Two Micron All Sky Survey images of
edge-on galaxies.
Bizyaev D., Mitronova S.
<Astrophys. J., 702, 1567-1574 (2009)>
=2009ApJ...702.1567B 2009ApJ...702.1567B
ADC_Keywords: Galaxies, IR ; Morphology
Keywords: galaxies: halos - galaxies: photometry - galaxies: spiral -
galaxies: structure - infrared: galaxies
Abstract:
We present results of an analysis of the J, H, and Ks Two Micron All
Sky Survey (2MASS) images of 139 spiral edge-on galaxies selected from
the Revised Flat Galaxies Catalog. The basic structural parameters
scale length (h), scale height (z0), and central surface brightness
of the stellar disks (µ0) are determined for all selected
galaxies in the near-infrared (NIR) bands. The mean relative ratios of
the scale heights of the thin stellar disks in the J:H:Ks bands are
1.16:1.08:1.00, respectively. Comparing the scale heights obtained
from the NIR bands for the same objects, we estimate the scale heights
of the thin stellar disks corrected for the internal extinction. We
find that the extinction-corrected scale height is, on average, 11%
smaller than that in the K band. Using the extinction-corrected
structural parameters, we find that the dark-to-luminous mass ratio
is, on average, 1.3 for the galaxies in our sample within the
framework of a simplified galactic model. The relative thicknesses of
the stellar disks z0/h correlates with their face-on central surface
brightnesses obtained from the 2MASS images. We also find that the
scale height of the stellar disks shows no systematic growth with
radius in most of our galaxies.
Description:
As a predefined sample of edge-on galaxies, the Revised Flat Galaxies
Catalog (RFGC; Karachentsev et al. 1999, Cat. VII/219) is chosen. To
secure enough pixels for studying the vertical structure, we select
objects with the major axis greater than 1 arcmin. This size is
estimated directly from the 2MASS images (Cat. VII/233) at the level
of S/N∼3.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 61 139 The structural parameters of the galaxies
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See also:
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
VII/219 : Revised Flat Galaxy Catalogue (RFGC) (Karachentsev+, 1999)
J/A+A/389/795 : Vertical structure of edge-on galaxies (Bizyaev+, 2002)
J/other/BSAO/50.5 : Velocities of RFGC galaxies (Karachentsev+, 2000)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [RFGC]
5- 8 I4 --- RFGC Galaxy name
10- 13 F4.2 kpc hK Scalelength in the Ks band
15- 18 F4.2 kpc e_hK Uncertainty in hK
20- 23 F4.2 kpc z0K Scaleheight in the Ks band
25- 28 F4.2 kpc e_z0K Uncertainty in z0K
30- 34 F5.2 mag/arcsec2 mu0K Central Ks band surface brightness
36- 39 F4.2 mag/arcsec2 e_mu0K Uncertainty in mu0K
41- 44 F4.2 kpc z0 Extinction-corrected scaleheight
46- 50 F5.3 --- z0/h Extinction-corrected relative thickness
of stellar disk
52- 56 F5.2 mag/arcsec2 mu0Kc Extinction-corrected central Ks band
surface brightness
58- 61 F4.2 --- Md/Ml Dark-to-luminous mass ratio
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 10-Oct-2011