Illuminating dark matter halo density profiles without subhaloes
Abstract
Cold dark matter haloes consist of a relatively smooth dark matter component as well as a system of bound subhaloes. It is the prevailing practice to include all mass, including mass in subhaloes, in studies of halo density profiles in simulations. However, often in observational studies satellites are treated as having their own distinct dark matter density profiles in addition to the profile of the host. This difference can make comparisons between theoretical and observed results difficult. In this work, we investigate density profiles of the smooth components of host haloes by excluding mass contained within subhaloes. We find that the density profiles of the smooth halo component (without subhaloes) differ substantially from the conventional halo density profile, declining more rapidly at large radii. We also find that concentrations derived from smooth density profiles exhibit less scatter at fixed mass and a weaker mass dependence than standard concentrations. Both smooth and standard halo profiles can be described by a generalized Einasto profile, an Einasto profile with a modified central slope, with smaller residuals than either a Navarro–Frenk–White or Einasto profile. Furthermore, these results hold for both Milky Way-mass and cluster-mass haloes. This new characterization of smooth halo profiles can bemore »
- Authors:
-
[1];
[2];
[1];
[3];
- Univ. of Pittsburgh, PA (United States)
- Univ. of Pittsburgh, PA (United States); Rutgers Univ., Piscataway, NJ (United States)
- The Ohio State Univ., Columbus, OH (United States)
- Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1768408
- Grant/Contract Number:
- AC02-76SF00515; AST 1517563; HST-HF2-51441.001
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Volume: 499; Journal Issue: 2; Journal ID: ISSN 0035-8711
- Publisher:
- Royal Astronomical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; methods: numerical; galaxies: groups: general; galaxies: haloes; dark matter
Citation Formats
Fielder, Catherine E., Mao, Yao-Yuan, Zentner, Andrew R., Newman, Jeffrey A., Wu, Hao-Yi, and Wechsler, Risa H. Illuminating dark matter halo density profiles without subhaloes. United States: N. p., 2020.
Web. doi:10.1093/mnras/staa2851.
Fielder, Catherine E., Mao, Yao-Yuan, Zentner, Andrew R., Newman, Jeffrey A., Wu, Hao-Yi, & Wechsler, Risa H. Illuminating dark matter halo density profiles without subhaloes. United States. https://doi.org/10.1093/mnras/staa2851
Fielder, Catherine E., Mao, Yao-Yuan, Zentner, Andrew R., Newman, Jeffrey A., Wu, Hao-Yi, and Wechsler, Risa H. Sat .
"Illuminating dark matter halo density profiles without subhaloes". United States. https://doi.org/10.1093/mnras/staa2851. https://www.osti.gov/servlets/purl/1768408.
@article{osti_1768408,
title = {Illuminating dark matter halo density profiles without subhaloes},
author = {Fielder, Catherine E. and Mao, Yao-Yuan and Zentner, Andrew R. and Newman, Jeffrey A. and Wu, Hao-Yi and Wechsler, Risa H.},
abstractNote = {Cold dark matter haloes consist of a relatively smooth dark matter component as well as a system of bound subhaloes. It is the prevailing practice to include all mass, including mass in subhaloes, in studies of halo density profiles in simulations. However, often in observational studies satellites are treated as having their own distinct dark matter density profiles in addition to the profile of the host. This difference can make comparisons between theoretical and observed results difficult. In this work, we investigate density profiles of the smooth components of host haloes by excluding mass contained within subhaloes. We find that the density profiles of the smooth halo component (without subhaloes) differ substantially from the conventional halo density profile, declining more rapidly at large radii. We also find that concentrations derived from smooth density profiles exhibit less scatter at fixed mass and a weaker mass dependence than standard concentrations. Both smooth and standard halo profiles can be described by a generalized Einasto profile, an Einasto profile with a modified central slope, with smaller residuals than either a Navarro–Frenk–White or Einasto profile. Furthermore, these results hold for both Milky Way-mass and cluster-mass haloes. This new characterization of smooth halo profiles can be useful for many analyses, such as lensing and dark matter annihilation, in which the smooth and clumpy components of a halo should be accounted for separately.},
doi = {10.1093/mnras/staa2851},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 499,
place = {United States},
year = {Sat Sep 19 00:00:00 EDT 2020},
month = {Sat Sep 19 00:00:00 EDT 2020}
}
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