The abundance of dwarf galaxies around low-mass spiral galaxies in the Local Volume

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dc.contributor.authorMuller, Oliver
dc.contributor.authorJerjen, Helmut
dc.date.accessioned2022-10-10T04:58:28Z
dc.date.available2022-10-10T04:58:28Z
dc.date.issued2020
dc.date.updated2021-11-28T07:22:04Z
dc.description.abstractThe abundance of satellite dwarf galaxies has long been considered a crucial test for the current model of cosmology leading to the well-known missing satellite problem. Recent advances in simulations and observations have allowed the study of dwarf galaxies around host galaxies in more detail. Using the Dark Energy Camera we surveyed a 72 deg2 area of the nearby Sculptor group, also encompassing the two low-mass Local Volume galaxies NGC 24 and NGC 45 residing behind the group, to search for as yet undetected dwarf galaxies. Apart from the previously known dwarf galaxies we found only two new candidates down to a 3σ surface brightness detection limit of 27.4 r mag arcsec-2. Both systems are in projection close to NGC 24. However, one of these candidates could be an ultra-diffuse galaxy associated with a background galaxy. We compared the number of known dwarf galaxy candidates around NGC 24, NGC 45, and five other well-studied low-mass spiral galaxies (NGC 1156, NGC 2403, NGC 5023, M 33, and the LMC) with predictions from cosmological simulations, and found that for the stellar-to-halo mass models considered, the observed satellite numbers tend to be on the lower end of the expected range. This could mean either that there is an overprediction of luminous subhalos in ΛCDM or that we are missing some of the satellite members due to observational biases.en_AU
dc.description.sponsorshipO.M. wants to thank the Swiss National Science Foundation for financial supporten_AU
dc.format.mimetypeapplication/pdfen_AU
dc.identifier.issn0004-6361en_AU
dc.identifier.urihttp://hdl.handle.net/1885/274406
dc.language.isoen_AUen_AU
dc.provenanceOpen Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.en_AU
dc.publisherSpringeren_AU
dc.relationhttp://purl.org/au-research/grants/arc/DP150100862en_AU
dc.rights© 2020 The authorsen_AU
dc.rights.licenseCreative Commons Attribution licenceen_AU
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en_AU
dc.sourceAstronomy and Astrophysicsen_AU
dc.subjectgalaxies: dwarfen_AU
dc.subjectgalaxies: abundancesen_AU
dc.subjectgalaxies: groups: individual: Sculptor groupen_AU
dc.subjectgalaxies: groups: generalen_AU
dc.titleThe abundance of dwarf galaxies around low-mass spiral galaxies in the Local Volumeen_AU
dc.typeJournal articleen_AU
dcterms.accessRightsOpen Accessen_AU
local.bibliographicCitation.issueA91en_AU
local.bibliographicCitation.startpage7en_AU
local.contributor.affiliationMuller, Oliver, Universite de Strasbourgen_AU
local.contributor.affiliationJerjen, Helmut, College of Science, ANUen_AU
local.contributor.authoremailu9611777@anu.edu.auen_AU
local.contributor.authoruidJerjen, Helmut, u9611777en_AU
local.description.notesImported from ARIESen_AU
local.identifier.absfor510104 - Galactic astronomyen_AU
local.identifier.ariespublicationa383154xPUB15850en_AU
local.identifier.citationvolume644en_AU
local.identifier.doi10.1051/0004-6361/202038862en_AU
local.identifier.scopusID2-s2.0-85097365821
local.identifier.uidSubmittedBya383154en_AU
local.publisher.urlhttps://www.aanda.org/en_AU
local.type.statusPublished Versionen_AU

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