Show simple item record

dc.contributor.authorOh, Se-Heon
dc.contributor.authorHunter, Deidre A.
dc.contributor.authorBrinks, E.
dc.contributor.authorElmegreen, Bruce G.
dc.contributor.authorSchruba, Andreas
dc.contributor.authorWalter, Fabian
dc.contributor.authorRupen, Michael P.
dc.contributor.authorYoung, Lisa M.
dc.contributor.authorSimpson, Caroline E.
dc.contributor.authorJohnson, Megan
dc.contributor.authorHerrmann, Kimberly A.
dc.contributor.authorFicut-Vicas, Dana
dc.contributor.authorCigan, Phil
dc.contributor.authorHeesen, V.
dc.contributor.authorAshley, Trisha
dc.contributor.authorZhang, Hong-Xin
dc.date.accessioned2015-06-02T11:06:07Z
dc.date.available2015-06-02T11:06:07Z
dc.date.issued2015-06
dc.identifier.citationOh , S-H , Hunter , D A , Brinks , E , Elmegreen , B G , Schruba , A , Walter , F , Rupen , M P , Young , L M , Simpson , C E , Johnson , M , Herrmann , K A , Ficut-Vicas , D , Cigan , P , Heesen , V , Ashley , T & Zhang , H-X 2015 , ' High-resolution mass models of dwarf galaxies from LITTLE THINGS ' , The Astronomical Journal , vol. 149 , no. 6 , 180 . https://doi.org/10.1088/0004-6256/149/6/180
dc.identifier.issn0004-6256
dc.identifier.otherPURE: 8243530
dc.identifier.otherPURE UUID: 172f6417-db47-42f7-af36-21a8fe5f038e
dc.identifier.otherArXiv: http://arxiv.org/abs/1502.01281v1
dc.identifier.otherScopus: 84934873692
dc.identifier.otherORCID: /0000-0002-7758-9699/work/30407796
dc.identifier.urihttp://hdl.handle.net/2299/15984
dc.description.abstractWe present high-resolution rotation curves and mass models of 26 dwarf galaxies from LITTLE THINGS. LITTLE THINGS is a high-resolution Very Large Array HI survey for nearby dwarf galaxies in the local volume within 11 Mpc. The rotation curves of the sample galaxies derived in a homogeneous and consistent manner are combined with Spitzer archival 3.6 micron and ancillary optical U, B, and V images to construct mass models of the galaxies. We decompose the rotation curves in terms of the dynamical contributions by baryons and dark matter halos, and compare the latter with those of dwarf galaxies from THINGS as well as Lambda CDM SPH simulations in which the effect of baryonic feedback processes is included. Being generally consistent with THINGS and simulated dwarf galaxies, most of the LITTLE THINGS sample galaxies show a linear increase of the rotation curve in their inner regions, which gives shallower logarithmic inner slopes alpha of their dark matter density profiles. The mean value of the slopes of the 26 LITTLE THINGS dwarf galaxies is alpha =-0.32 +/- 0.24 which is in accordance with the previous results found for low surface brightness galaxies (alpha = -0.2 +/- 0.2) as well as the seven THINGS dwarf galaxies (alpha =-0.29 +/- 0.07). However, this significantly deviates from the cusp-like dark matter distribution predicted by dark-matter-only Lambda CDM simulations. Instead our results are more in line with the shallower slopes found in the Lambda CDM SPH simulations of dwarf galaxies in which the effect of baryonic feedback processes is included. In addition, we discuss the central dark matter distribution of DDO 210 whose stellar mass is relatively low in our sample to examine the scenario of inefficient supernova feedback in low mass dwarf galaxies predicted from recent Lambda SPH simulations of dwarf galaxies where central cusps still remain.en
dc.format.extent96
dc.language.isoeng
dc.relation.ispartofThe Astronomical Journal
dc.rightsOpen
dc.subjectastro-ph.GA
dc.subjectastro-ph.CO
dc.titleHigh-resolution mass models of dwarf galaxies from LITTLE THINGSen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Accepted Version
dcterms.dateAccepted2015-06
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1088/0004-6256/149/6/180
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record