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The low dark matter content of the lenticular galaxy NGC 3998

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MNRAS_2016_Boardman_3029_43.pdf (7.520Mb)
Date
11/08/2016
Author
Boardman, N. F.
Weijmans, A.
Bosch, R. C. E. van den
Zhu, L.
Yildirim, A.
Ven, G. van de
Cappellari, M.
Zeeuw, P. T. de
Emsellem, E.
Krajnović, D.
Naab, T.
Funder
The Leverhulme Trust
Science & Technology Facilities Council
PPARC - Now STFC
Science & Technology Facilities Council
Science & Technology Facilities Council
Grant ID
ECF-2014-767
ST/I000666/1
PP/D000890/1
ST/M001296/1
ST/G001006/1
Keywords
Dark matter
Galaxies: elliptical and lenticular, CD
Galaxies: ISM
Galaxies: kinematics and dynamics
Galaxies: structure
ISM: kinematics and dynamics
QB Astronomy
QC Physics
NDAS
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Abstract
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 +0.32/−0.45 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 percent within one half-light radius.
Citation
Boardman , N F , Weijmans , A , Bosch , R C E V D , Zhu , L , Yildirim , A , Ven , G V D , Cappellari , M , Zeeuw , P T D , Emsellem , E , Krajnović , D & Naab , T 2016 , ' The low dark matter content of the lenticular galaxy NGC 3998 ' , Monthly Notices of the Royal Astronomical Society , vol. 460 , no. 3 , pp. 3029-3043 . https://doi.org/10.1093/mnras/stw1187
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stw1187
ISSN
0035-8711
Type
Journal article
Rights
© 2016, The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at mnras.oxfordjournals.org / https://dx.doi.org/10.1093/mnras/stw1187
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/9000

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