MHONGOOSE discovery of a gas-rich low surface brightness galaxy in the Dorado group

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dc.contributor.authorMaccagni F.M.
dc.contributor.authorDe Blok W.J.G.
dc.contributor.authorMancera Piña P.E.
dc.contributor.authorRagusa R.
dc.contributor.authorIodice E.
dc.contributor.authorSpavone M.
dc.contributor.authorMcgaugh S.
dc.contributor.authorOman K.A.
dc.contributor.authorOosterloo T.A.
dc.contributor.authorKoribalski B.S.
dc.contributor.authorKim M.
dc.contributor.authorAdams E.A.K.
dc.contributor.authorAmram P.
dc.contributor.authorBosma A.
dc.contributor.authorBigiel F.
dc.contributor.authorBrinks E.
dc.contributor.authorChemin L.
dc.contributor.authorCombes F.
dc.contributor.authorGibson B.
dc.contributor.authorHealy J.
dc.contributor.authorHolwerda B.W.
dc.contributor.authorJózsa G.I.G.
dc.contributor.authorKamphuis P.
dc.contributor.authorKleiner D.
dc.contributor.authorKurapati S.
dc.contributor.authorMarasco A.
dc.contributor.authorSpekkens K.
dc.contributor.authorVeronese S.
dc.contributor.authorWalter F.
dc.contributor.authorZabel N.
dc.contributor.authorZijlstra A.
dc.date.accessioned2024-12-10T18:47:06Z
dc.date.available2024-12-10T18:47:06Z
dc.date.issued2024-10
dc.descriptionIndexación: Scopus.
dc.description.abstractWe present the discovery of a low-mass, gas-rich low surface brightness galaxy in the Dorado group, at a distance of 17.7 Mpc. Combining deep MeerKAT 21-cm observations from the MeerKAT Hi Observations of Nearby Galactic Objects: Observing Southern Emitters (MHONGOOSE) survey with deep photometric images from the VST Early-type Galaxy Survey (VEGAS) we find a stellar and neutral atomic hydrogen (H i) gas mass of M∗ = 2:23 × 106M⊙ and MHI = 1:68 × 106 M⊙, respectively. This low surface brightness galaxy is the lowest-mass Hi detection found in a group beyond the local Universe (D ≳ 10 Mpc). The dwarf galaxy has the typical overall properties of gas-rich low surface brightness galaxies in the Local group, but with some striking differences. Namely, the MHONGOOSE observations reveal a very low column density (∼ 1018-19 cm-2) Hi disk with asymmetrical morphology possibly supported by rotation and higher velocity dispersion in the centre. There, deep optical photometry and UV observations suggest a recent enhancement of the star formation. Found at galactocentric distances where in the Local Group dwarf galaxies are depleted of cold gas (at a projected distance of 390 kpc from the group centre), this galaxy is likely on its first orbit within the Dorado group. We discuss the possible environmental effects that may have caused the formation of the Hi disk and the enhancement of star formation (SF), highlighting the short-lived phase (a few hundreds million years) of the gaseous disk, before either SF or hydrodynamical forces will deplete the gas of the galaxy.
dc.description.urihttps://www-scopus-com.recursosbiblioteca.unab.cl/record/display.uri?eid=2-s2.0-85202077196&origin=resultslist&sort=plf-f&src=s&sid=5c113630fb7a8e96da2a475f933917ba&sot=aff&sdt=cl&cluster=scosubjabbr%2C%22PHYS%22%2Ct%2C%22EART%22%2Ct%2C%22CHEM%22%2Ct%2C%22ENGI%22%2Ct%2C%22MATE%22%2Ct%2Bscosubtype%2C%22ar%22%2Ct%2Bscofreetoread%2C%22all%22%2Ct&s=AF-ID%2860002636%29+AND+SUBJAREA%28PHYS%29&sl=34&sessionSearchId=5c113630fb7a8e96da2a475f933917ba&relpos=26
dc.identifier.citationAstronomy and Astrophysics Open Access Volume 6901 October 2024 Article number A69
dc.identifier.doi10.1051/0004-6361/202449441
dc.identifier.issn00046361
dc.identifier.urihttps://repositorio.unab.cl/handle/ria/62508
dc.language.isoen
dc.publisherEDP Sciences
dc.rights.licenseCC BY 4.0 Attribution 4.0 International
dc.subjectGalaxies: dwarf
dc.subjectGalaxies: evolution
dc.subjectGalaxies: formation
dc.subjectGalaxies: kinematics and dynamics
dc.titleMHONGOOSE discovery of a gas-rich low surface brightness galaxy in the Dorado group
dc.typeArtículo
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