Fast cloud-cloud collisions in a strongly barred galaxy: suppression of massive star formation

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dc.contributor.authorFujimoto, Yusuke
dc.contributor.authorMaeda, Fumiya
dc.contributor.authorHabe, Asao
dc.contributor.authorOhta, Kouji
dc.date.accessioned2023-09-06T01:48:25Z
dc.date.issued2020
dc.date.updated2022-07-31T08:16:56Z
dc.description.abstractRecent galaxy observations show that star formation activity changes depending on galactic environments. In order to understand the diversity of galactic-scale star formation, it is crucial to understand the formation and evolution of giant molecular clouds in an extreme environment. We focus on observational evidence that bars in strongly barred galaxies lack massive stars even though quantities of molecular gas are sufficient to form stars. In this paper, we present a hydrodynamical simulation of a strongly barred galaxy, using a stellar potential which is taken from observational results of NGC 1300, and we compare cloud properties between different galactic environments: bar, bar-end, and spiral arms. We find that the mean of cloud’s virial parameter is αvir ∼ 1 and that there is no environmental dependence, indicating that the gravitationally bound state of a cloud is not behind the observational evidence of the lack of massive stars in strong bars. Instead, we focus on cloud–cloud collisions, which have been proposed as a triggering mechanism for massive star formation. We find that the collision speed in the bar is faster than those in the other regions. We examine the collision frequency using clouds’ kinematics and conclude that the fast collisions in the bar could originate from random-like motion of clouds due to elliptical gas orbits shifted by the bar potential. These results suggest that the observed regions of lack of active star formation in the strong bar originate from the fast cloud–cloud collisions, which are inefficient in forming massive stars, due to the galactic-scale violent gas motion.en_AU
dc.description.sponsorshipFM is supported by Research Fellowship for Young Scientists from the JSPS. AH is funded by the JSPS KAKENHI grant number JP19K03923. KO is supported by the Grants-in-Aid for Scientific Research (C) (16K05294 and 19K03928) from the Japan Society of the Promotion of Science (JSPS). Computations described in this work were performed using the publicly available ENZO code (Bryan et al. 2014; http://enzo-project.org), which is the product of a collaborative effort of many independent scientists from numerous institutions around the world. Their commitment to open science has helped make this work possible. We acknowledge extensive use of the YT package (Turk et al. 2011; http://yt-project.org) in analysing these results and the authors would like to thank the YT development team for their generous help. This paper makes use of the following ALMA data: ADS/JAO.ALMA number 2015.1.00925.S. ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ.en_AU
dc.format.mimetypeapplication/pdfen_AU
dc.identifier.issn0035-8711en_AU
dc.identifier.urihttp://hdl.handle.net/1885/298276
dc.language.isoen_AUen_AU
dc.provenancehttps://v2.sherpa.ac.uk/id/publication/24618/..."published version can be archived in institutional repository" from SHERPA/RoMEO site as at 11/09/2023
dc.publisherBlackwell Publishing Ltden_AU
dc.relationhttp://purl.org/au-research/grants/arc/DP160100695en_AU
dc.rights© 2020 The authorsen_AU
dc.sourceMonthly Notices of the Royal Astronomical Societyen_AU
dc.subjecthydrodynamicsen_AU
dc.subjectmethods: numericalen_AU
dc.subjectISM: cloudsen_AU
dc.subjectISM: structureen_AU
dc.subjectgalaxies: star formationen_AU
dc.subjectgalaxies: structureen_AU
dc.titleFast cloud-cloud collisions in a strongly barred galaxy: suppression of massive star formationen_AU
dc.typeJournal articleen_AU
dcterms.accessRightsOpen Access
local.bibliographicCitation.issue2en_AU
local.bibliographicCitation.lastpage2146en_AU
local.bibliographicCitation.startpage2131en_AU
local.contributor.affiliationFujimoto, Yusuke, College of Science, ANUen_AU
local.contributor.affiliationMaeda, Fumiya, Kyoto Universityen_AU
local.contributor.affiliationHabe, Asao, Hokkaido Universityen_AU
local.contributor.affiliationOhta, Kouji, Kyoto Universityen_AU
local.contributor.authoremailu1026715@anu.edu.auen_AU
local.contributor.authoruidFujimoto, Yusuke, u1026715en_AU
local.description.embargo2099-12-31
local.description.notesImported from ARIESen_AU
local.identifier.absfor510100 - Astronomical sciencesen_AU
local.identifier.absseo280120 - Expanding knowledge in the physical sciencesen_AU
local.identifier.ariespublicationa383154xPUB13644en_AU
local.identifier.citationvolume494en_AU
local.identifier.doi10.1093/mnras/staa840en_AU
local.identifier.thomsonIDWOS:000535877200045
local.identifier.uidSubmittedBya383154en_AU
local.publisher.urlhttps://academic.oup.com/en_AU
local.type.statusPublished Versionen_AU

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