Show simple item record

Files in this item


Item metadata

dc.contributor.authorStark, David V.
dc.contributor.authorBundy, Kevin A.
dc.contributor.authorOrr, Matthew E.
dc.contributor.authorHopkins, Philip F.
dc.contributor.authorWestfall, Kyle
dc.contributor.authorBershady, Matthew
dc.contributor.authorLi, Cheng
dc.contributor.authorBizyaev, Dmitry
dc.contributor.authorMasters, Karen L.
dc.contributor.authorWeijmans, Anne-Marie
dc.contributor.authorLacerna, Ivan
dc.contributor.authorThomas, Daniel
dc.contributor.authorDrory, Niv
dc.contributor.authorYan, Renbin
dc.contributor.authorZhang, Kai
dc.identifier.citationStark , D V , Bundy , K A , Orr , M E , Hopkins , P F , Westfall , K , Bershady , M , Li , C , Bizyaev , D , Masters , K L , Weijmans , A-M , Lacerna , I , Thomas , D , Drory , N , Yan , R & Zhang , K 2017 , ' SDSS-IV MaNGA : constraints on the conditions for star formation in galaxy discs ' Monthly Notices of the Royal Astronomical Society .
dc.identifier.otherPURE: 251533458
dc.identifier.otherPURE UUID: c1322920-9bb7-4c54-a58b-52df122ea08b
dc.identifier.otherBibCode: 2017arXiv171100178S
dc.identifier.otherScopus: 85042610117
dc.identifier.otherORCID: /0000-0002-5908-6852/work/40233481
dc.descriptionFunding: Leverhulme Trust Early Career Fellowship (AW)en
dc.description.abstractRegions of disc galaxies with widespread star formation tend to be both gravitationally unstable and self-shielded against ionizing radiation, whereas extended outer discs with little or no star formation tend to be stable and unshielded on average. We explore what drives the transition between these two regimes, specifically whether discs first meet the conditions for self-shielding (parameterized by dust optical depth, τ) or gravitational instability (parameterized by a modified version of Toomre’s instability parameters, Qthermal, which quantifies the stability of a gas disc that is thermally supported at T = 104 K). We first introduce a new metric formed by the product of these quantities, Qthermalτ, which indicates whether the conditions for disk instability or self-shielding are easier to meet in a given region of a galaxy, and we discuss how Qthermalτ can be constrained even in the absence of direct gas information. We then analyse a sample of 13 galaxies with resolved gas measurements and find that on average galaxies will reach the threshold for disk instabilities (Qthermal < 1) before reaching the threshold for self-shielding (τ > 1). Using integral field spectroscopic observations of a sample of 236 galaxies from the MaNGA survey, we find that the value of Qthermalτ in star-forming discs is consistent with similar behavior. These results support a scenario where disc fragmentation and collapse occurs before self-shielding, suggesting that gravitational instabilities are the primary condition for widespread star formation in galaxy discs. Our results support similar conclusions based on recent galaxy simulations.en
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen
dc.rights© 2017, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at
dc.subjectGalaxies: star formationen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleSDSS-IV MaNGA : constraints on the conditions for star formation in galaxy discsen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

This item appears in the following Collection(s)

Show simple item record