1998A&AS..130...81M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST08:24:06

1998A&AS..130...81M - Astron. Astrophys., Suppl. Ser., 130, 81-108 (1998/May-2)

Near-infrared surface photometry of early-type spiral galaxies. I. Bulge and disk decomposition.

MORIONDO G., GIOVANARDI C. and HUNT L.K.

Abstract (from CDS):

We present near-infrared (NIR) surface photometry of a sample of 14 early-type spirals with observed rotation curves. In this first paper, we report the results of two-dimensional parametric and non-parametric decompositions to separate the bulge and disk components; the parametric bulge is modeled with a generalized exponential law of integer index n, and the disk with a simple exponential. We find that the derived bulge parameters, for a given galaxy, vary systematically with the bulge shape index n. The mean early-type bulge has a best-fit n=2.6, and 80% of the sample has best n of 2 or 3. Bulges are rarely spherical; the median bulge intrinsic ellipticity is 0.33. The median early-type disk has (J-K)d more than 0.1mag bluer than the bulge, and a NIR disk surface brightness more than 1mag/arcsec2 brighter than later-type disks. Our data are consistent with the well-established correlation of both bulge and disk surface brightness with physical scale length, and we note that the location of bulges within this projection of the fundamental plane depends on their shape index n. In agreement with previous work, the ratios of bulge and disk scale lengths are consistent with a constant value re/rd=0.3; however, such value again depends on the bulge index n, implying that claims for a scale-free Hubble sequence may be premature.

Abstract Copyright:

Journal keyword(s): galaxies: spiral - galaxies: structure - infrared: galaxies

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 1024 IG 02 39 11.965 +10 50 48.52   13.8       ~ 87 0
2 NGC 2639 Sy1 08 43 38.093 +50 12 19.94 12.90 12.56 11.65     ~ 383 2
3 NGC 2775 G 09 10 20.112 +07 02 16.53   11.417 10.481 9.920 8.994 ~ 318 0
4 NGC 2841 LIN 09 22 02.655 +50 58 35.32 10.43 10.09 9.22     ~ 986 1
5 NGC 3593 GiG 11 14 36.9733686308 +12 49 05.505076217   11.8       ~ 327 2
6 IC 724 LIN 11 43 34.673 +08 56 33.18   13.8       ~ 69 0
7 NGC 3898 LIN 11 49 15.370 +56 05 03.66   11.7       ~ 267 1
8 NGC 4378 Sy2 12 25 18.076 +04 55 30.09   14.51 13.49     ~ 221 0
9 NGC 4419 LIN 12 26 56.433 +15 02 50.72 12.42 12.08 11.16     ~ 368 1
10 NGC 4450 LIN 12 28 29.634 +17 05 05.82   10.90 10.08     ~ 510 1
11 NGC 4698 Sy2 12 48 22.9112380605 +08 29 14.648866444   13.24 12.27     ~ 443 0
12 NGC 4845 AGN 12 58 01.242 +01 34 32.09   17.40 16.31     ~ 208 0
13 NGC 5879 AGN 15 09 46.7282797389 +57 00 00.544806616   11.9       ~ 223 1
14 NGC 6314 LIN 17 12 38.6893448746 +23 16 12.247289041 16.04 15.56 14.62 14.02 13.33 ~ 87 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-08:24:06

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