A Widespread, Clumpy Starburst in the Isolated Ongoing Dwarf Galaxy Merger dm1647+21

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dc.contributor.authorPrivon, G. C.
dc.contributor.authorStierwalt, S.
dc.contributor.authorPatton, D. R.
dc.contributor.authorBesla, G.
dc.contributor.authorPearson, S.
dc.contributor.authorPutman, M.
dc.contributor.authorJohnson, K. E.
dc.contributor.authorKallivayalil, N.
dc.contributor.authorLiss, S.
dc.date.accessioned2024-01-10T12:37:45Z
dc.date.available2024-01-10T12:37:45Z
dc.date.issued2017
dc.description.abstractInteractions between pairs of isolated dwarf galaxies provide a critical window into low-mass hierarchical, gas-dominated galaxy assembly and the build-up of stellar mass in low-metallicity systems. We present the first Very Large Telescope/Multi Unit Spectroscopic Explorer (VLT/MUSE) optical integral field unit (IFU) observations of the interacting dwarf pair dm1647+21 selected from the TiNy Titans survey. The Ha emission is widespread and corresponds to a total unobscured star formation rate (SFR) of 0.44 M-circle dot yr(-1), which is 2.7 times higher than the SFR inferred from Sloan Digital Sky Survey (SDSS) data. The implied specific SFR (sSFR) for the system is elevated by more than an order of magnitude above non-interacting dwarfs in the same mass range. This increase is dominated by the lower-mass galaxy, which has a sSFR enhancement of > 50. Examining the spatially resolved maps of classic optical line diagnostics, we find that the interstellar medium (ISM) excitation can be fully explained by star formation. The velocity field of the ionized gas is not consistent with simple rotation. Dynamical simulations indicate that the irregular velocity field and the stellar structure is consistent with the identification of this system as an ongoing interaction between two dwarf galaxies. The widespread, clumpy enhancements in the star formation in this system point to important differences in the effect of mergers on dwarf galaxies, compared to massive galaxies; rather than the funneling of gas to the nucleus and giving rise to a nuclear starburst, starbursts in low-mass galaxy mergers may be triggered by large-scale ISM compression, and thus may be more distributed.
dc.description.funderAlfred P. Sloan Foundation
dc.description.funderU.S. Department of Energy Office of Science
dc.description.funderCenter for High-performance Computing at the University of Utah
dc.description.funderNational Aeronautics and Space Administration
dc.fechaingreso.objetodigital2024-05-30
dc.format.extent8 páginas
dc.fuente.origenWOS
dc.identifier.doi10.3847/1538-4357/aa8560
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.3847/1538-4357/aa8560
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/76916
dc.identifier.wosidWOS:000409019800005
dc.information.autorucFísica;Privon G;S/I;1031484
dc.issue.numero1
dc.language.isoen
dc.nota.accesoContenido parcial
dc.publisherIOP PUBLISHING LTD
dc.revistaASTROPHYSICAL JOURNAL
dc.rightsacceso restringido
dc.subjectgalaxies: dwarf
dc.subjectgalaxies: individual (SDSS J164710.66+210514.5, SDSS J164711.12+210514.8)
dc.subjectgalaxies: interactions
dc.subjectgalaxies: ISM
dc.subjectgalaxies: starburst
dc.subjectENHANCED STAR-FORMATION
dc.subjectDIGITAL SKY SURVEY
dc.subjectLOCAL VOLUME
dc.subjectINFRARED GALAXIES
dc.subjectFORMING GALAXIES
dc.subjectMAJOR MERGERS
dc.subjectDISK GALAXIES
dc.subjectCLASSIFICATION
dc.subjectULTRAVIOLET
dc.subjectENCOUNTERS
dc.titleA Widespread, Clumpy Starburst in the Isolated Ongoing Dwarf Galaxy Merger dm1647+21
dc.typeartículo
dc.volumen846
sipa.codpersvinculados1031484
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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