J/ApJ/510/637 Near IR properties of Galaxy disks (Hunt+ 1999)
The Disks of Galaxies with Seyfert and Starburst Nuclei.
II. Near-Infrared Structural Properties
Hunt L. K., Malkan M. A., Moriondo G., Salvati M.
<Astrophys. J. 510, 637 (1999)>
=1999ApJ...510..637H 1999ApJ...510..637H
ADC_Keywords: Galaxies, IR; Galaxies, Seyfert; Infrared sources;
Photometry, infrared; Photometry, surface
Keywords: galaxies: active - galaxies: Seyfert - galaxies: starburst -
infrared: galaxies
Abstract:
We have derived the near-infrared structural components of a sample of
Seyfert and starburst (SBN) host galaxies by fitting near-infrared
images with a new two-dimensional decomposition algorithm. An analysis
of the fitted parameters shows that Seyfert 1 and SBN bulges resemble
normal early-type bulges in structure and color, with (J-K)cb
about 0.1 mag redder than disk (J-K)cd. Seyfert 2 bulges, on the
other hand, are bluer than normal, with (J-K)cb~(J-K)cd.
Seyfert disks (especially type 1), but not those of SBNs, are
abnormally bright (in surface brightness), significantly more so than
even the brightest normal disks. Seyfert disks are also compact, but
similar to those in normal early-type spirals. For a given mass,
Seyfert and particularly SBN galaxies are abnormally rich in neutral
hydrogen, and there is strong, albeit indirect, evidence for lower
mass-to-light (M/L) ratios in Seyfert and SBN disks, but normal M/L
ratios in their bulges. In Seyfert and SBN galaxies, H I mass
fractions and M/L ratios are anticorrelated, and we attribute the high
gas mass fractions and low M/L ratios in SBNs and several Seyfert
galaxies to ongoing star formation. Such abundant gas in Seyfert
galaxies would be expected to inhibit bar formation, which may explain
why active galaxies are not always barred.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 161 24 Near IR structural parameters
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See also:
VII/155 : Third Reference Cat. of Bright Galaxies (RC3)
(de Vaucouleurs+ 1991)
J/AJ/108/2128 : RC3 corrections and additions (Corwin+ 1994)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Galaxy name
11- 15 F5.1 Mpc Dist Distance (1)
17 I1 --- NBest Best fitting bulge exponent
18 A1 --- u_NBest [:] colon signifies ill-determined
21- 25 F5.3 --- epsil ? Ellipticity of the bulge
28- 31 F4.2 --- e_epsil ? Uncertainty in epsil of the bulge
33- 37 F5.2 arcsec angBsiz ? Angular scale length of the bulge
40- 43 F4.2 arcsec e_angBsiz ? Uncertainty in angBsiz of the bulge
46- 49 F4.2 kpc phyBsiz ? Physical scale length of the bulge
52- 56 F5.2 mag/arcsec2 KmagB ? Surface brightness in K band of
the bulge (2)
59- 62 F4.2 mag/arcsec2 e_KmagB ? Uncertainty in SB of the bulge
65- 68 F4.2 mag J-K ? J-K color of the bulge
71- 75 F5.2 mag H-K ? H-K color of the bulge
78- 83 F6.2 mag KMagB ? Absolute K band magnitude of the bulge
86- 89 F4.1 deg incl ? Inclination of the disk
92- 95 F4.1 deg e_incl ? Uncertainty in incl
98-102 F5.2 arcsec angDsiz ? Angular scale length of the disk
105-108 F4.2 arcsec e_angDsiz ? Uncertainty in SLD
110-113 F4.2 kpc phyDsiz ? Physical scale length of the disk
116-120 F5.2 mag/arcsec2 SBD ? Surface brightness in K band of
the disk (2)
123-126 F4.2 mag/arcsec2 e_SBD ? Uncertainty in SBD of the disk
129-132 F4.2 mag (J-K)D ? J-K color of the disk
135-138 F4.2 mag (H-K)D ? H-K color of the disk
141-146 F6.2 mag KMagD ? Absolute K band magnitude of the disk
149-154 F6.2 mag KMagG Absolute K band magnitude of the galaxy
158-161 F4.1 --- chi2 χ2 of the NBest
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Note (1): Distances are calculated according to the precepts of the RC3
Ho=75 km.s-1.Mpc-1
Note (2): Surface brightness has been corrected for Galactic extinction
and redshift as in Hunt+ 1997 (1997ApJS..108..229H 1997ApJS..108..229H), and transformed
to face-on values assuming optical transparency (see Moriondo+ 1998a
1998A&AS..130...81M 1998A&AS..130...81M)
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History:
From the ApJ electronic edition.
References:
Hunt+ 1997 (1997ApJS..108..229H 1997ApJS..108..229H) Paper I
(End) Greg Schwarz (AAS) 09-Feb-2000