The low dark matter content of the lenticular galaxy NGC 3998

N. F. Boardman; A. Weijmans; R. C. E. van den Bosch; L. Zhu; A. Yildirim; G. van de Ven; M. Cappellari; P. T. de Zeeuw; E. Emsellem; D. Krajnović; T. Naab

doi:10.1093/mnras/stw1187

The low dark matter content of the lenticular galaxy NGC 3998

N. F. Boardman, A. Weijmans, R. C. E. van den Bosch, L. Zhu, A. Yildirim, G. van de Ven, M. Cappellari, P. T. de Zeeuw, E. Emsellem, D. Krajnović, T. Naab

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	3029-3043
Journal	Monthly Notices of the Royal Astronomical Society
Volume	460
Issue number	3
Early online date	20 May 2016
DOIs	https://doi.org/10.1093/mnras/stw1187
Publication status	Published - 11 Aug 2016

Keywords

Dark matter
Galaxies: elliptical and lenticular, CD
Galaxies: ISM
Galaxies: kinematics and dynamics
Galaxies: structure
ISM: kinematics and dynamics

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10.1093/mnras/stw1187

MNRAS-2016-Boardman-3029-43
© 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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Astronomy at St Andrews 2015-2018: Astronomy at St Andrews 2015-2018
Jardine, M. M. (PI), Cameron, A. C. (CoI), Cyganowski, C. J. (CoI), Horne, K. D. (CoI) & Wood, K. (CoI)
Science & Technology Facilities Council
1/04/15 → 31/03/18
Project: Standard
Leverhulme Fellowship: Galaxies over Cosmic Time
Weijmans, A.-M. (CoI)
The Leverhulme Trust
1/01/15 → 31/12/17
Project: Fellowship
PATT linked Travel and Subsistence: St Andrrews Astronomy PATT linked Travel and subsistence
Cameron, A. C. (PI), Driver, S. P. (CoI), Greaves, J. S. (CoI) & Horne, K. D. (CoI)
Science & Technology Facilities Council
1/10/10 → 30/09/13
Project: Standard

Data underpinning - The low dark matter content of the lenticular galaxy NGC 3998
Boardman, N. F. (Creator), Weijmans, A.-M. (Creator), Bosch, R. C. E. V. D. (Creator), Zhu, L. (Creator), Yildirim, A. (Creator), Ven, G. V. D. (Creator), Cappellari, M. (Creator), de Zeeuw, P. T. (Creator), Emsellem, E. (Creator), Krajnović, D. (Creator) & Naab, T. (Creator), University of St Andrews, 23 Jun 2016
DOI: 10.17630/de872873-5bcd-44cf-b59e-87200eeef3e7
Dataset

File

Cite this

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title = "The low dark matter content of the lenticular galaxy NGC 3998",

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.",

keywords = "Dark matter, Galaxies: elliptical and lenticular, CD, Galaxies: ISM, Galaxies: kinematics and dynamics, Galaxies: structure, ISM: kinematics and dynamics",

author = "Boardman, {N. F.} and A. Weijmans and Bosch, {R. C. E. van den} and L. Zhu and A. Yildirim and Ven, {G. van de} and M. Cappellari and Zeeuw, {P. T. de} and E. Emsellem and D. Krajnovi{\'c} and T. Naab",

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month = aug,

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doi = "10.1093/mnras/stw1187",

language = "English",

volume = "460",

pages = "3029--3043",

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T1 - The low dark matter content of the lenticular galaxy NGC 3998

AU - Boardman, N. F.

AU - Weijmans, A.

AU - Bosch, R. C. E. van den

AU - Zhu, L.

AU - Yildirim, A.

AU - Ven, G. van de

AU - Cappellari, M.

AU - Zeeuw, P. T. de

AU - Emsellem, E.

AU - Krajnović, D.

AU - Naab, T.

PY - 2016/8/11

Y1 - 2016/8/11

N2 - 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.

AB - 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.

KW - Dark matter

KW - Galaxies: elliptical and lenticular, CD

KW - Galaxies: ISM

KW - Galaxies: kinematics and dynamics

KW - Galaxies: structure

KW - ISM: kinematics and dynamics

U2 - 10.1093/mnras/stw1187

DO - 10.1093/mnras/stw1187

M3 - Article

SN - 0035-8711

VL - 460

SP - 3029

EP - 3043

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

The low dark matter content of the lenticular galaxy NGC 3998

Abstract

Keywords

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Projects

Astronomy at St Andrews 2015-2018: Astronomy at St Andrews 2015-2018

Leverhulme Fellowship: Galaxies over Cosmic Time

PATT linked Travel and Subsistence: St Andrrews Astronomy PATT linked Travel and subsistence

Datasets

Data underpinning - The low dark matter content of the lenticular galaxy NGC 3998

Cite this