2016MNRAS.460.3029B


Query : 2016MNRAS.460.3029B

2016MNRAS.460.3029B - Mon. Not. R. Astron. Soc., 460, 3029-3043 (2016/August-2)

The low dark matter content of the lenticular galaxy NGC 3998.

BOARDMAN N.F., WEIJMANS A.-M., VAN DEN BOSCH R., ZHU L., YILDIRIM A., VAN DE VEN G., CAPPELLARI M., DE ZEEUW T., EMSELLEM E., KRAJNOVIC D. and NAAB T.

Abstract (from CDS):

We observed the lenticular galaxy NGC 3998 with the Mitchell Integral-Field Spectrograph and extracted line-of-sight velocity distributions out to three half-light radii. We constructed collisionless orbit models in order to constrain NGC 3998's dark and visible structure, using kinematics from both the Mitchell and SAURON instruments. We find NGC 3998 to be almost axisymmetric, seen nearly face-on with a flattened intrinsic shape - i.e. a face-on fast rotator. We find an I-band mass-to-light ratio of 4.7_{-0.45}^{+0.32} in good agreement with previous spectral fitting results for this galaxy. Our best-fitting orbit model shows a both a bulge and a disc component, with a non-negligible counter-rotating component also evident. We find that relatively little dark matter is needed to model this galaxy, with an inferred dark mass fraction of just (7.1^{+8.1}_{-7.1})per cent within one half-light radius.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

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

Simbad objects: 4

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Number of rows : 4
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 1286 G 03 17 48.5251674163 -07 37 00.640139482   15   13.38   ~ 19 0
2 NGC 1277 GiG 03 19 51.488 +41 34 24.26   14.9       ~ 166 0
3 Mrk 1216 LIN 08 28 47.122 -06 56 24.64   15.5       ~ 54 0
4 NGC 3998 SyG 11 57 56.1333561013 +55 27 12.925850484   11.64 12.10 10.09   ~ 593 2

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2021.12.06-19:29:33

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