1997A&A...323..349P


Query : 1997A&A...323..349P

1997A&A...323..349P - Astronomy and Astrophysics, volume 323, 349-356 (1997/7-2)

The distribution of ionized gas in early-type galaxies. III. M/L determinations based on triaxial models.

PIZZELLA A., AMICO P., BERTOLA F., BUSON L.M., DANZIGER I.J., DEJONGHE H., SADLER E.M., SAGLIA R.P., DE ZEEUW P.T. and ZEILINGER W.W.

Abstract (from CDS):

The velocity fields of ionized gas disks in four elliptical galaxies have been exploited to derive the mass-to-light ratios as function of radial distance. For each galaxy, namely NGC 1453, NGC 2974, NGC 5077 and NGC 7097, we derive a set of intrinsic shapes of the stellar component and viewing angles that are consistent with the observed ellipticities and orientation of the isophotes. A least-squares fit to the observed velocity field gives the set of parameters defining the potential that best reproduces the kinematics of the ionized gas disk as well as the mass density and light density radial profiles. For three galaxies a satisfactory model is found. The M/L ratio does change within individual galaxies, though not showing any systematic increase with radius and has a mean value of about 5M/LB☉ out to ∼1Re.

Abstract Copyright:

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: ISM - galaxies: structure - galaxies: kinematics and dynamics

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 1453 GiG 03 46 27.2307890592 -03 58 07.831476768   13   11.30   ~ 164 0
2 NGC 2974 Sy2 09 42 33.2918467632 -03 41 57.038311068   12.19   10.77   ~ 423 0
3 NGC 3962 LIN 11 54 40.0986420456 -13 58 30.234748836   13.16 12.16 11.15   ~ 146 0
4 NAME NGC 4636 Group GrG 12 42 49.5 +02 41 08           ~ 556 0
5 NGC 4636 LIN 12 42 49.8333280080 +02 41 15.951929028   12.62 11.84     ~ 1075 1
6 NGC 5077 GiP 13 19 31.6697719944 -12 39 25.086455856   13.87 12.85 11.30   ~ 281 0
7 NGC 6868 GiP 20 09 54.082 -48 22 46.25   11.58 9.22 10.01 7.91 ~ 212 1
8 NGC 7097 GiP 21 40 12.9231946008 -42 32 21.879559932   12.66 11.71 11.21   ~ 114 0

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2022.06.25-12:52:27

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