THE CENTRAL SLOPE OF DARK MATTER CORES IN DWARF GALAXIES: SIMULATIONS VERSUS THINGS

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dc.contributor.authorOh, Se-Heon
dc.contributor.authorBrook, Chris
dc.contributor.authorGovernato, Fabio
dc.contributor.authorBrinks, Elias
dc.contributor.authorMayer, Lucio
dc.contributor.authorde Blok, W J G
dc.contributor.authorBrooks, Alyson
dc.contributor.authorWalter, Fabian
dc.date.accessioned2021-10-08T07:20:33Z
dc.date.available2021-10-08T07:20:33Z
dc.date.issued2011
dc.description.abstractWe make a direct comparison of the derived dark matter (DM) distributions between hydrodynamical simulations of dwarf galaxies assuming ACDM cosmology and the observed dwarf galaxies sample from the THINGS survey in terms of (1) the rotation curve shape and (2) the logarithmic inner density slope a of mass density profiles. The simulations, which include the effect of baryonic feedback processes, such as gas cooling, star formation, cosmic UV background heating, and most importantly, physically motivated gas outflows driven by supernovae, form bulgeless galaxies with DM cores. We show that the stellar and baryonic mass is similar to that inferred from photometric and kinematic methods for galaxies of similar circular velocity. Analyzing the simulations in exactly the same way as the observational sample allows us to address directly the so-called cusp/core problem in the ACDM model. We show that the rotation curves of the simulated dwarf galaxies rise less steeply than cold dark matter rotation curves and are consistent with those of the THINGS dwarf galaxies. The mean value of the logarithmic inner density slopes alpha of the simulated galaxies' DM density profiles is similar to-0.4 +/- 0.1, which shows good agreement with alpha = -0.29 +/- 0.07 of the THINGS dwarf galaxies. The effect of non-circular motions is not significant enough to affect the results. This confirms that the baryonic feedback processes included in the simulations are efficiently able to make the initial cusps with alpha similar to-1.0 to -1.5 predicted by DM-only simulations shallower and induce DM halos with a central mass distribution similar to that observed in nearby dwarf galaxies.
dc.identifier.apacitationOh, S., Brook, C., Governato, F., Brinks, E., Mayer, L., de Blok, W. J. G., ... Walter, F. (2011). THE CENTRAL SLOPE OF DARK MATTER CORES IN DWARF GALAXIES: SIMULATIONS VERSUS THINGS. <i>The Astronomical Journal</i>, 142(1), 24 - 177. http://hdl.handle.net/11427/34953en_ZA
dc.identifier.chicagocitationOh, Se-Heon, Chris Brook, Fabio Governato, Elias Brinks, Lucio Mayer, W J G de Blok, Alyson Brooks, and Fabian Walter "THE CENTRAL SLOPE OF DARK MATTER CORES IN DWARF GALAXIES: SIMULATIONS VERSUS THINGS." <i>The Astronomical Journal</i> 142, 1. (2011): 24 - 177. http://hdl.handle.net/11427/34953en_ZA
dc.identifier.citationOh, S., Brook, C., Governato, F., Brinks, E., Mayer, L., de Blok, W.J.G., Brooks, A. & Walter, F. et al. 2011. THE CENTRAL SLOPE OF DARK MATTER CORES IN DWARF GALAXIES: SIMULATIONS VERSUS THINGS. <i>The Astronomical Journal.</i> 142(1):24 - 177. http://hdl.handle.net/11427/34953en_ZA
dc.identifier.issn0004-6256
dc.identifier.issn1538-3881
dc.identifier.ris TY - Journal Article AU - Oh, Se-Heon AU - Brook, Chris AU - Governato, Fabio AU - Brinks, Elias AU - Mayer, Lucio AU - de Blok, W J G AU - Brooks, Alyson AU - Walter, Fabian AB - We make a direct comparison of the derived dark matter (DM) distributions between hydrodynamical simulations of dwarf galaxies assuming ACDM cosmology and the observed dwarf galaxies sample from the THINGS survey in terms of (1) the rotation curve shape and (2) the logarithmic inner density slope a of mass density profiles. The simulations, which include the effect of baryonic feedback processes, such as gas cooling, star formation, cosmic UV background heating, and most importantly, physically motivated gas outflows driven by supernovae, form bulgeless galaxies with DM cores. We show that the stellar and baryonic mass is similar to that inferred from photometric and kinematic methods for galaxies of similar circular velocity. Analyzing the simulations in exactly the same way as the observational sample allows us to address directly the so-called cusp/core problem in the ACDM model. We show that the rotation curves of the simulated dwarf galaxies rise less steeply than cold dark matter rotation curves and are consistent with those of the THINGS dwarf galaxies. The mean value of the logarithmic inner density slopes alpha of the simulated galaxies' DM density profiles is similar to-0.4 +/- 0.1, which shows good agreement with alpha = -0.29 +/- 0.07 of the THINGS dwarf galaxies. The effect of non-circular motions is not significant enough to affect the results. This confirms that the baryonic feedback processes included in the simulations are efficiently able to make the initial cusps with alpha similar to-1.0 to -1.5 predicted by DM-only simulations shallower and induce DM halos with a central mass distribution similar to that observed in nearby dwarf galaxies. DA - 2011 DB - OpenUCT DP - University of Cape Town IS - 1 J1 - The Astronomical Journal LK - https://open.uct.ac.za PY - 2011 SM - 0004-6256 SM - 1538-3881 T1 - THE CENTRAL SLOPE OF DARK MATTER CORES IN DWARF GALAXIES: SIMULATIONS VERSUS THINGS TI - THE CENTRAL SLOPE OF DARK MATTER CORES IN DWARF GALAXIES: SIMULATIONS VERSUS THINGS UR - http://hdl.handle.net/11427/34953 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34953
dc.identifier.vancouvercitationOh S, Brook C, Governato F, Brinks E, Mayer L, de Blok WJG, et al. THE CENTRAL SLOPE OF DARK MATTER CORES IN DWARF GALAXIES: SIMULATIONS VERSUS THINGS. The Astronomical Journal. 2011;142(1):24 - 177. http://hdl.handle.net/11427/34953.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Astronomy
dc.publisher.facultyFaculty of Science
dc.sourceThe Astronomical Journal
dc.source.journalissue1
dc.source.journalvolume142
dc.source.pagination24 - 177
dc.source.urihttps://dx.doi.org/10.1088/0004-6256/142/1/24
dc.subject.otherastrophysics
dc.subject.othercosmology and astronomy
dc.subject.otherbaryons
dc.subject.othercosmology
dc.subject.othergalaxies
dc.subject.othergas cooling
dc.subject.othermass distribution
dc.subject.othernonluminous matter
dc.subject.otherrotation
dc.subject.othersimulation
dc.subject.otherstar evolution
dc.subject.othersupernovae binary stars
dc.subject.othercooling
dc.subject.otherdistribution
dc.subject.otherelementary particles
dc.subject.othereruptive variable stars
dc.subject.otherevolution
dc.subject.otherfermions
dc.subject.otherhadrons
dc.subject.othermatter
dc.subject.othermotion
dc.subject.otherspatial distribution
dc.subject.otherstars
dc.subject.othervariable stars
dc.titleTHE CENTRAL SLOPE OF DARK MATTER CORES IN DWARF GALAXIES: SIMULATIONS VERSUS THINGS
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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