Skip navigation
Skip navigation

Star formation suppression in compact group galaxies: A new path to quenching?

Alatalo, Katherine; Appleton, P N; Lisenfeld, U; Bitsakis, Theodoros; Lanz, L; Lacy, Mark; Charmandaris, Vassilis; Cluver, M.E.; Dopita, Michael; Guillard, Pierre; Jarrett, Thomas; Kewley, Lisa; Rasmussen, Jens Juul; Yun, M S

Description

We present CO(1-0) maps of 12 warm H2-selected Hickson Compact Groups (HCGs), covering 14 individually imaged warm H2 bright galaxies, with the Combined Array for Research in Millimeter Astronomy. We found a variety of molecular gas distributions within the HCGs, including regularly rotating disks, bars, rings, tidal tails, and possibly nuclear outflows, though the molecular gas morphologies are more consistent with spirals and early-type galaxies than mergers and interacting systems. Our...[Show more]

dc.contributor.authorAlatalo, Katherine
dc.contributor.authorAppleton, P N
dc.contributor.authorLisenfeld, U
dc.contributor.authorBitsakis, Theodoros
dc.contributor.authorLanz, L
dc.contributor.authorLacy, Mark
dc.contributor.authorCharmandaris, Vassilis
dc.contributor.authorCluver, M.E.
dc.contributor.authorDopita, Michael
dc.contributor.authorGuillard, Pierre
dc.contributor.authorJarrett, Thomas
dc.contributor.authorKewley, Lisa
dc.contributor.authorRasmussen, Jens Juul
dc.contributor.authorYun, M S
dc.date.accessioned2018-11-29T22:52:37Z
dc.date.available2018-11-29T22:52:37Z
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/152228
dc.description.abstractWe present CO(1-0) maps of 12 warm H2-selected Hickson Compact Groups (HCGs), covering 14 individually imaged warm H2 bright galaxies, with the Combined Array for Research in Millimeter Astronomy. We found a variety of molecular gas distributions within the HCGs, including regularly rotating disks, bars, rings, tidal tails, and possibly nuclear outflows, though the molecular gas morphologies are more consistent with spirals and early-type galaxies than mergers and interacting systems. Our CO-imaged HCG galaxies, when plotted on the Kennicutt-Schmidt relation, shows star formation (SF) suppression of distributed bimodally, with five objects exhibiting suppressions of 10 and depletion timescales 10 Gyr. This SF inefficiency is also seen in the efficiency per freefall time of Krumholz et al. We investigate the gas-to-dust ratios of these galaxies to determine if an incorrect LCO-M(H2) conversion caused the apparent suppression and find that HCGs have normal gas-to-dust ratios. It is likely that the cause of the apparent suppression in these objects is associated with shocks injecting turbulence into the molecular gas, supported by the fact that the required turbulent injection luminosity is consistent with the bright H2 luminosity reported by Cluver et al. Galaxies with high SF suppression ( 10) also appear to be those in the most advanced stages of transition across both optical and infrared color space. This supports the idea that at least some galaxies in HCGs are transitioning objects, where a disruption of the existing molecular gas in the system suppresses SF by inhibiting the molecular gas from collapsing and forming stars efficiently. These observations, combined with recent work on poststarburst galaxies with molecular reservoirs, indicates that galaxies do not need to expel their molecular reservoirs prior to quenching SF and transitioning from blue spirals to red early-type galaxies. This may imply that SF quenching can occur without the need to starve a galaxy of cold gas first.
dc.format.mimetypeapplication/pdf
dc.publisherIOP Publishing
dc.sourceThe Astrophysical Journal
dc.titleStar formation suppression in compact group galaxies: A new path to quenching?
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume812
dc.date.issued2015
local.identifier.absfor020100 - ASTRONOMICAL AND SPACE SCIENCES
local.identifier.ariespublicationU3488905xPUB6699
local.type.statusPublished Version
local.contributor.affiliationAlatalo, Katherine, California Institute of Technology
local.contributor.affiliationAppleton, P N, California Institute of Technology
local.contributor.affiliationLisenfeld, U, Universidad de Granada
local.contributor.affiliationBitsakis, Theodoros, California Institute of Technology
local.contributor.affiliationLanz, L, California Institute of Technology
local.contributor.affiliationLacy, Mark, National Radio Astronomy Observatory
local.contributor.affiliationCharmandaris, Vassilis, University of Crete
local.contributor.affiliationCluver, M.E., University of the Western Cape
local.contributor.affiliationDopita, Michael, College of Science, ANU
local.contributor.affiliationGuillard, Pierre, Universite Paris-Sud XI
local.contributor.affiliationJarrett, Thomas, University of Cape Town
local.contributor.affiliationKewley, Lisa, College of Science, ANU
local.contributor.affiliationRasmussen, Jens Juul, Technical University of Denmark
local.contributor.affiliationYun, M S, University of Massachusetts
local.bibliographicCitation.issue2
local.identifier.doi10.1088/0004-637X/812/2/117
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2018-11-29T07:47:20Z
local.identifier.scopusID2-s2.0-84946089707
local.identifier.thomsonID000365206600029
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

Download

File Description SizeFormat Image
01_Alatalo_Star_formation_suppression_in_2015.pdf7.04 MBAdobe PDFThumbnail


Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.

Updated:  19 May 2020/ Responsible Officer:  University Librarian/ Page Contact:  Library Systems & Web Coordinator