Mapping the dark matter halo of early-type galaxy NGC 2974 through orbit-based models with combined stellar and cold gas kinematics
Abstract
ABSTRACT We present an orbit-based method of combining stellar and cold gas kinematics to constrain the dark matter profile of early-type galaxies. We apply this method to early-type galaxy NGC 2974, using Pan-STARRS imaging and SAURON stellar kinematics to model the stellar orbits, and introducing H i kinematics from VLA observation as a tracer of the gravitational potential. The introduction of the cold gas kinematics shows a significant effect on the confidence limits of especially the dark halo properties: we exclude more than $$95{{\ \rm per\ cent}}$$ of models within the 1σ confidence level of Schwarzschild modelling with only stellar kinematics, and reduce the relative uncertainty of the dark matter fraction significantly to $$10{{\ \rm per\ cent}}$$ within 5Re. Adopting a generalized Navarro–Frenk–White (NFW) dark matter profile, we measure a shallow cuspy inner slope of $$0.6^{+0.2}_{-0.3}$$ when including the cold gas kinematics in our model. We cannot constrain the inner slope with the stellar kinematics alone.
- Authors:
-
[2];
[3];
[5];
- School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, China
- Department of Astrophysics, University of Vienna, Türkenschanzstrasse 17, Vienna 1180, Austria, European Southern Observatory, Karl-Schwarzschild-Str 2, Garching bei Munchen D-85748, Germany
- Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112, USA
- Netherlands Institute for Radio Astronomy (ASTRON), Postbus 2, Dwingeloo NL-7990 AA, the Netherlands, Kapteyn Astronomical Institute, University of Groningen, PO Box 800, Groningen NL-9700 AV, the Netherlands
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1579588
- Resource Type:
- Published Article
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 491 Journal Issue: 3; Journal ID: ISSN 0035-8711
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Yang, Meng, Zhu, Ling, Weijmans, Anne-Marie, van de Ven, Glenn, Boardman, Nicholas, Morganti, Raffaella, and Oosterloo, Tom. Mapping the dark matter halo of early-type galaxy NGC 2974 through orbit-based models with combined stellar and cold gas kinematics. United Kingdom: N. p., 2019.
Web. doi:10.1093/mnras/stz3293.
Yang, Meng, Zhu, Ling, Weijmans, Anne-Marie, van de Ven, Glenn, Boardman, Nicholas, Morganti, Raffaella, & Oosterloo, Tom. Mapping the dark matter halo of early-type galaxy NGC 2974 through orbit-based models with combined stellar and cold gas kinematics. United Kingdom. doi:https://doi.org/10.1093/mnras/stz3293
Yang, Meng, Zhu, Ling, Weijmans, Anne-Marie, van de Ven, Glenn, Boardman, Nicholas, Morganti, Raffaella, and Oosterloo, Tom. Tue .
"Mapping the dark matter halo of early-type galaxy NGC 2974 through orbit-based models with combined stellar and cold gas kinematics". United Kingdom. doi:https://doi.org/10.1093/mnras/stz3293.
@article{osti_1579588,
title = {Mapping the dark matter halo of early-type galaxy NGC 2974 through orbit-based models with combined stellar and cold gas kinematics},
author = {Yang, Meng and Zhu, Ling and Weijmans, Anne-Marie and van de Ven, Glenn and Boardman, Nicholas and Morganti, Raffaella and Oosterloo, Tom},
abstractNote = {ABSTRACT We present an orbit-based method of combining stellar and cold gas kinematics to constrain the dark matter profile of early-type galaxies. We apply this method to early-type galaxy NGC 2974, using Pan-STARRS imaging and SAURON stellar kinematics to model the stellar orbits, and introducing H i kinematics from VLA observation as a tracer of the gravitational potential. The introduction of the cold gas kinematics shows a significant effect on the confidence limits of especially the dark halo properties: we exclude more than $95{{\ \rm per\ cent}}$ of models within the 1σ confidence level of Schwarzschild modelling with only stellar kinematics, and reduce the relative uncertainty of the dark matter fraction significantly to $10{{\ \rm per\ cent}}$ within 5Re. Adopting a generalized Navarro–Frenk–White (NFW) dark matter profile, we measure a shallow cuspy inner slope of $0.6^{+0.2}_{-0.3}$ when including the cold gas kinematics in our model. We cannot constrain the inner slope with the stellar kinematics alone.},
doi = {10.1093/mnras/stz3293},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 491,
place = {United Kingdom},
year = {2019},
month = {11}
}
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