Dynamical Constraints on the Dark Matter Distribution of the Sculptor Dwarf Spheroidal from Stellar Proper Motions

doi:https://doi.org/10.3847/1538-4357/aac2d3

Title: Dynamical Constraints on the Dark Matter Distribution of the Sculptor Dwarf Spheroidal from Stellar Proper Motions

Abstract

In this work, we compare the transverse velocity dispersions recently measured within the Sculptor dwarf spheroidal galaxy to the predictions of our previously published dynamical model. This was designed to fit the observed number count and velocity dispersion profiles of both metal-rich and metal-poor stars, both in cored and in cusped potentials. At the projected radius where the proper motions (PMs) were measured, this model (with no change in parameters) predicts transverse dispersions in the range of 6–9.5 km s ^-1, with the tangential dispersion about 1 km s ^-1 larger than the (projected) radial dispersion. Both dispersions are predicted to be about 1 km s ^-1 larger for metal-poor than for metal-rich stars. At this projected radius, cored and cusped potentials predict almost identical transverse dispersions. The measured tangential dispersion (8.5 ± 3.2 km s ^-1) agrees remarkably well with these predictions, while the measured radial dispersion (11.5 ± 4.3 km s ^-1) differs only at about the 1σ level. Thus, the PM data are in excellent agreement with previous data, but do not help to distinguish between cored and cusped potentials. Lastly, this will require velocity dispersion data (either from PMs or from radial velocities) with uncertainties wellmore »« less

Authors:

^[1]; Frenk, Carlos S. ^[2]; White, Simon D. M. ^[3]

Texas A & M Univ., College Station, TX (United States)
Univ. of Durham, Durham (United Kingdom)
Max-Planck-Institut für Astrophysik, München (Germany)

Publication Date:: 2018-06-12

Research Org.:: Texas A & M Univ., College Station, TX (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1529519

Grant/Contract Number:: SC0010813

Resource Type:: Journal Article: Accepted Manuscript

Journal Name:: The Astrophysical Journal (Online)

Additional Journal Information:: Journal Volume: 860; Journal Issue: 1; Journal ID: ISSN 1538-4357

Publisher:: Institute of Physics (IOP)

Country of Publication:: United States

Language:: English

Subject:: 79 ASTRONOMY AND ASTROPHYSICS; dark matter; galaxies: dwarf; Local Group

Citation Formats


                    Strigari, Louis E., Frenk, Carlos S., and White, Simon D.  M. Dynamical Constraints on the Dark Matter Distribution of the Sculptor Dwarf Spheroidal from Stellar Proper Motions.  United States: N. p., 2018. 
        Web.  doi:10.3847/1538-4357/aac2d3.

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                    Strigari, Louis E., Frenk, Carlos S., & White, Simon D.  M. Dynamical Constraints on the Dark Matter Distribution of the Sculptor Dwarf Spheroidal from Stellar Proper Motions.  United States.  https://doi.org/10.3847/1538-4357/aac2d3

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                    Strigari, Louis E., Frenk, Carlos S., and White, Simon D.  M. Tue .  
        "Dynamical Constraints on the Dark Matter Distribution of the Sculptor Dwarf Spheroidal from Stellar Proper Motions".  United States.  https://doi.org/10.3847/1538-4357/aac2d3.  https://www.osti.gov/servlets/purl/1529519.

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@article{osti_1529519,

  title        = {Dynamical Constraints on the Dark Matter Distribution of the Sculptor Dwarf Spheroidal from Stellar Proper Motions},

  author       = {Strigari, Louis E. and Frenk, Carlos S. and White, Simon D.  M.},

  abstractNote = {In this work, we compare the transverse velocity dispersions recently measured within the Sculptor dwarf spheroidal galaxy to the predictions of our previously published dynamical model. This was designed to fit the observed number count and velocity dispersion profiles of both metal-rich and metal-poor stars, both in cored and in cusped potentials. At the projected radius where the proper motions (PMs) were measured, this model (with no change in parameters) predicts transverse dispersions in the range of 6–9.5 km s-1, with the tangential dispersion about 1 km s-1 larger than the (projected) radial dispersion. Both dispersions are predicted to be about 1 km s-1 larger for metal-poor than for metal-rich stars. At this projected radius, cored and cusped potentials predict almost identical transverse dispersions. The measured tangential dispersion (8.5 ± 3.2 km s-1) agrees remarkably well with these predictions, while the measured radial dispersion (11.5 ± 4.3 km s-1) differs only at about the 1σ level. Thus, the PM data are in excellent agreement with previous data, but do not help to distinguish between cored and cusped potentials. Lastly, this will require velocity dispersion data (either from PMs or from radial velocities) with uncertainties well below 1 km s-1 over a range of projected radii.},

  doi          = {10.3847/1538-4357/aac2d3},

  url          = {https://www.osti.gov/biblio/1529519},
  journal      = {The Astrophysical Journal (Online)},

  issn         = {1538-4357},

  number       = 1,

  volume       = 860,

  place        = {United States},

  year         = {2018},

  month        = {6}

}

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Journal Article:

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https://doi.org/10.3847/1538-4357/aac2d3

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Cited by: 7 works

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Figures / Tables:

Figure 1: Posterior probability densities for the transverse radial and tangential velocity dispersions for different populations, based on the models of Strigari et al. (2017) which fit parameterized distribution functions to star count and LOS velocity dispersion data from Walker & Penarrubia (2011). The top row assumes an NFW darkmore »

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Works referenced in this record:

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Agnello, A.; Evans, N. W.
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Strigari, Louis E.; Frenk, Carlos S.; White, Simon D. M.
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Works referencing / citing this record:

Stellar chemo-kinematics of the Cetus dwarf spheroidal galaxy
journal, October 2018

Taibi, S.; Battaglia, G.; Kacharov, N.
Astronomy & Astrophysics, Vol. 618
https://doi.org/10.1051/0004-6361/201833414

The effect of tides on the Sculptor dwarf spheroidal galaxy
journal, May 2019

Iorio, G.; Nipoti, C.; Battaglia, G.
Monthly Notices of the Royal Astronomical Society, Vol. 487, Issue 4
https://doi.org/10.1093/mnras/stz1342

Stellar chemo-kinematics of the Cetus dwarf spheroidal galaxy
journal, October 2018

Taibi, S.; Battaglia, G.; Kacharov, N.
Astronomy & Astrophysics, Vol. 618
https://doi.org/10.1051/0004-6361/201833414

The effect of tides on the Sculptor dwarf spheroidal galaxy
journal, May 2019

Iorio, G.; Nipoti, C.; Battaglia, G.
Monthly Notices of the Royal Astronomical Society, Vol. 487, Issue 4
https://doi.org/10.1093/mnras/stz1342

Towards an improved model of self-interacting dark matter haloes
journal, December 2018

Sokolenko, Anastasia; Bondarenko, Kyrylo; Brinckmann, Thejs
Journal of Cosmology and Astroparticle Physics, Vol. 2018, Issue 12
https://doi.org/10.1088/1475-7516/2018/12/038

Dark matter heats up in dwarf galaxies
journal, January 2019

Read, J. I.; Walker, M. G.; Steger, P.
Monthly Notices of the Royal Astronomical Society, Vol. 484, Issue 1
https://doi.org/10.1093/mnras/sty3404

Scale-invariant dynamics of galaxies, MOND, dark matter, and the dwarf spheroidals
journal, December 2019

Maeder, Andre; Gueorguiev, Vesselin G.
Monthly Notices of the Royal Astronomical Society, Vol. 492, Issue 2
https://doi.org/10.1093/mnras/stz3613

Figures / Tables found in this record:

Figure 1(p. 3)

Figure 2(p. 4)

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Similar Records

Title: Dynamical Constraints on the Dark Matter Distribution of the Sculptor Dwarf Spheroidal from Stellar Proper Motions

Abstract

Citation Formats

Figures / Tables:

A Virial core in the Sculptor Dwarf Spheroidal Galaxy journal, July 2012

Dark matter cores and cusps: the case of multiple stellar populations in dwarf spheroidals: Multiple stellar population in dSphs journal, October 2011

The Kinematic Status and Mass Content of the Sculptor Dwarf Spheroidal Galaxy journal, June 2008

Halo Formation in Warm Dark Matter Models journal, July 2001

Orbit-based dynamical models of the Sculptor dSph galaxy journal, July 2013

The Structure of Dark Matter Halos in Dwarf Galaxies journal, July 1995

The Observed Properties of Dark Matter on Small Spatial Scales journal, July 2007

polychord: nested sampling for cosmology journal, April 2015

polychord: next-generation nested sampling journal, September 2015

Measuring the slopes of mass profiles for dwarf spheroidals in triaxial cold dark matter potentials journal, June 2013

Satellite galaxies in semi-analytic models of galaxy formation with sterile neutrino dark matter journal, June 2016

The Structure of Cold Dark Matter Halos journal, May 1996

A Universal Density Profile from Hierarchical Clustering journal, December 1997

The diversity and similarity of simulated cold dark matter haloes: Diversity and similarity of simulated CDM haloes journal, December 2009

How to break the density-anisotropy degeneracy in spherical stellar systems journal, July 2017

On the dark matter profile in Sculptor: breaking the β degeneracy with Virial shape parameters journal, May 2014

Cosmological simulations with self-interacting dark matter – I. Constant-density cores and substructure journal, January 2013

Observational Evidence for Self-Interacting Cold Dark Matter journal, April 2000

Determining the Nature of Dark Matter with Astrometry journal, February 2007

Kinematics of Milky Way satellites in a Lambda cold dark matter universe: Kinematics of Milky Way satellites journal, September 2010

Dynamical Models for the Sculptor Dwarf Spheroidal in a ΛCDM Universe journal, March 2017

Subhaloes in self-interacting galactic dark matter haloes: Self-interacting galactic dark matter haloes journal, May 2012

STELLAR VELOCITIES IN THE CARINA, FORNAX, SCULPTOR, AND SEXTANS dSph GALAXIES: DATA FROM THE MAGELLAN/MMFS SURVEY journal, January 2009

A Method for Measuring (Slopes of) the mass Profiles of Dwarf Spheroidal Galaxies journal, November 2011

The dynamics of binary galaxies journal, August 1981

Dark matter in dwarf spheroidals I. Models journal, March 2002

Stellar chemo-kinematics of the Cetus dwarf spheroidal galaxy journal, October 2018

The effect of tides on the Sculptor dwarf spheroidal galaxy journal, May 2019

Stellar chemo-kinematics of the Cetus dwarf spheroidal galaxy journal, October 2018

The effect of tides on the Sculptor dwarf spheroidal galaxy journal, May 2019

Towards an improved model of self-interacting dark matter haloes journal, December 2018

Dark matter heats up in dwarf galaxies journal, January 2019

Scale-invariant dynamics of galaxies, MOND, dark matter, and the dwarf spheroidals journal, December 2019

A Virial core in the Sculptor Dwarf Spheroidal Galaxy
journal, July 2012

Dark matter cores and cusps: the case of multiple stellar populations in dwarf spheroidals: Multiple stellar population in dSphs
journal, October 2011

The Kinematic Status and Mass Content of the Sculptor Dwarf Spheroidal Galaxy
journal, June 2008

Halo Formation in Warm Dark Matter Models
journal, July 2001

Orbit-based dynamical models of the Sculptor dSph galaxy
journal, July 2013

The Structure of Dark Matter Halos in Dwarf Galaxies
journal, July 1995

The Observed Properties of Dark Matter on Small Spatial Scales
journal, July 2007

polychord: nested sampling for cosmology
journal, April 2015

polychord: next-generation nested sampling
journal, September 2015

Measuring the slopes of mass profiles for dwarf spheroidals in triaxial cold dark matter potentials
journal, June 2013

Satellite galaxies in semi-analytic models of galaxy formation with sterile neutrino dark matter
journal, June 2016

The Structure of Cold Dark Matter Halos
journal, May 1996

A Universal Density Profile from Hierarchical Clustering
journal, December 1997

The diversity and similarity of simulated cold dark matter haloes: Diversity and similarity of simulated CDM haloes
journal, December 2009

How to break the density-anisotropy degeneracy in spherical stellar systems
journal, July 2017

On the dark matter profile in Sculptor: breaking the β degeneracy with Virial shape parameters
journal, May 2014

Cosmological simulations with self-interacting dark matter – I. Constant-density cores and substructure
journal, January 2013

Observational Evidence for Self-Interacting Cold Dark Matter
journal, April 2000

Determining the Nature of Dark Matter with Astrometry
journal, February 2007

Kinematics of Milky Way satellites in a Lambda cold dark matter universe: Kinematics of Milky Way satellites
journal, September 2010

Dynamical Models for the Sculptor Dwarf Spheroidal in a ΛCDM Universe
journal, March 2017

Subhaloes in self-interacting galactic dark matter haloes: Self-interacting galactic dark matter haloes
journal, May 2012

STELLAR VELOCITIES IN THE CARINA, FORNAX, SCULPTOR, AND SEXTANS dSph GALAXIES: DATA FROM THE MAGELLAN/MMFS SURVEY
journal, January 2009

A Method for Measuring (Slopes of) the mass Profiles of Dwarf Spheroidal Galaxies
journal, November 2011

The dynamics of binary galaxies
journal, August 1981

Dark matter in dwarf spheroidals I. Models
journal, March 2002

Stellar chemo-kinematics of the Cetus dwarf spheroidal galaxy
journal, October 2018

The effect of tides on the Sculptor dwarf spheroidal galaxy
journal, May 2019

Stellar chemo-kinematics of the Cetus dwarf spheroidal galaxy
journal, October 2018

The effect of tides on the Sculptor dwarf spheroidal galaxy
journal, May 2019

Towards an improved model of self-interacting dark matter haloes
journal, December 2018

Dark matter heats up in dwarf galaxies
journal, January 2019

Scale-invariant dynamics of galaxies, MOND, dark matter, and the dwarf spheroidals
journal, December 2019