Star formation in bulgeless late-type galaxies: Clues to their evolution

We present Giant Meterwave Radio Telescope 1280-MHz radio continuum observations and follow-up optical studies of the disc and nuclear star formation in a sample of low-luminosity bulgeless galaxies. The main aim is to understand bulge formation and overall disc evolution in these late-type galaxies...

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Detalles Bibliográficos
Autores: Das, M., Sengupta, Chaitali, Ramya, S., Misra, K.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2012
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/424822
Acceso en línea:http://hdl.handle.net/10261/424822
Access Level:acceso abierto
Palabra clave:Galaxies: bulges
Galaxies: evolution
Galaxies: individual
Galaxies: spiral
Galaxies: star formation
Radio continuum: galaxies.
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spelling Star formation in bulgeless late-type galaxies: Clues to their evolutionDas, M.Sengupta, ChaitaliRamya, S.Misra, K.Galaxies: bulgesGalaxies: evolutionGalaxies: individualGalaxies: spiralGalaxies: star formationRadio continuum: galaxies.We present Giant Meterwave Radio Telescope 1280-MHz radio continuum observations and follow-up optical studies of the disc and nuclear star formation in a sample of low-luminosity bulgeless galaxies. The main aim is to understand bulge formation and overall disc evolution in these late-type galaxies. We detected radio continuum from five of the 12 galaxies in our sample; the emission is mainly associated with disc star formation. Only two of the detected galaxies had extended radio emission; the others had patchy disc emission. In the former two galaxies, NGC3445 and NGC4027, the radio continuum is associated with star formation triggered by tidal interactions with nearby companion galaxies. We did follow-up Hα imaging and nuclear spectroscopy of both galaxies using the Himalayan Chandra Telescope. The Hα emission is mainly associated with the strong spiral arms. The nuclear spectra indicate ongoing nuclear star formation in NGC3445 and NGC4027 which may be associated with nuclear star clusters. No obvious signs of active galactic nuclei activity were detected. Although nearly bulgeless, both galaxies appear to have central oval distortions in the R-band images; these could represent pseudo-bulges that may later evolve into large bulges. We thus conclude that tidal interactions are an important means of bulge formation and disc evolution in bulgeless galaxies; without such triggers these galaxies appear to be low in star formation and overall disc evolution. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS.We thank the GMRT staff for help in the observations. The GMRT is operated by the National Center for Radio Astrophysics of the Tata Institute of Fundamental Research. We also thank the staff of HCT, IAO for the support during the observations. This publication makes use of data products from the 2MASS, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propul- sion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.Peer reviewedOxford University PressNASANational Science Foundation (US)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202620262012info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/424822reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1111/j.1365-2966.2012.21120.xSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/4248222026-05-22T06:33:51Z
dc.title.none.fl_str_mv Star formation in bulgeless late-type galaxies: Clues to their evolution
title Star formation in bulgeless late-type galaxies: Clues to their evolution
spellingShingle Star formation in bulgeless late-type galaxies: Clues to their evolution
Das, M.
Galaxies: bulges
Galaxies: evolution
Galaxies: individual
Galaxies: spiral
Galaxies: star formation
Radio continuum: galaxies.
title_short Star formation in bulgeless late-type galaxies: Clues to their evolution
title_full Star formation in bulgeless late-type galaxies: Clues to their evolution
title_fullStr Star formation in bulgeless late-type galaxies: Clues to their evolution
title_full_unstemmed Star formation in bulgeless late-type galaxies: Clues to their evolution
title_sort Star formation in bulgeless late-type galaxies: Clues to their evolution
dc.creator.none.fl_str_mv Das, M.
Sengupta, Chaitali
Ramya, S.
Misra, K.
author Das, M.
author_facet Das, M.
Sengupta, Chaitali
Ramya, S.
Misra, K.
author_role author
author2 Sengupta, Chaitali
Ramya, S.
Misra, K.
author2_role author
author
author
dc.contributor.none.fl_str_mv NASA
National Science Foundation (US)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Galaxies: bulges
Galaxies: evolution
Galaxies: individual
Galaxies: spiral
Galaxies: star formation
Radio continuum: galaxies.
topic Galaxies: bulges
Galaxies: evolution
Galaxies: individual
Galaxies: spiral
Galaxies: star formation
Radio continuum: galaxies.
description We present Giant Meterwave Radio Telescope 1280-MHz radio continuum observations and follow-up optical studies of the disc and nuclear star formation in a sample of low-luminosity bulgeless galaxies. The main aim is to understand bulge formation and overall disc evolution in these late-type galaxies. We detected radio continuum from five of the 12 galaxies in our sample; the emission is mainly associated with disc star formation. Only two of the detected galaxies had extended radio emission; the others had patchy disc emission. In the former two galaxies, NGC3445 and NGC4027, the radio continuum is associated with star formation triggered by tidal interactions with nearby companion galaxies. We did follow-up Hα imaging and nuclear spectroscopy of both galaxies using the Himalayan Chandra Telescope. The Hα emission is mainly associated with the strong spiral arms. The nuclear spectra indicate ongoing nuclear star formation in NGC3445 and NGC4027 which may be associated with nuclear star clusters. No obvious signs of active galactic nuclei activity were detected. Although nearly bulgeless, both galaxies appear to have central oval distortions in the R-band images; these could represent pseudo-bulges that may later evolve into large bulges. We thus conclude that tidal interactions are an important means of bulge formation and disc evolution in bulgeless galaxies; without such triggers these galaxies appear to be low in star formation and overall disc evolution. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS.
publishDate 2012
dc.date.none.fl_str_mv 2012
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/424822
url http://hdl.handle.net/10261/424822
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1111/j.1365-2966.2012.21120.x
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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