Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    Diffuse X-Ray-emitting Gas in Major Mergers

    265476.pdf (2.352Mb)
    Access Status
    Open access
    Authors
    Smith, B.
    Campbell, K.
    Struck, C.
    Soria, Roberto
    Swartz, D.
    Magno, M.
    Dunn, B.
    Giroux, M.
    Date
    2018
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Smith, B. and Campbell, K. and Struck, C. and Soria, R. and Swartz, D. and Magno, M. and Dunn, B. et al. 2018. Diffuse X-Ray-emitting Gas in Major Mergers. Astronomical Journal. 155: Article number 2.
    Source Title
    Astronomical Journal
    DOI
    10.3847/1538-3881/aaa1a6
    ISSN
    0004-6256
    School
    Curtin Institute of Radio Astronomy (Physics)
    Remarks

    Copyright © 2018 The American Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/66900
    Collection
    • Curtin Research Publications
    Abstract

    Using archived data from the Chandra X-ray telescope, we have extracted the diffuse X-ray emission from 49 equal-mass interacting/merging galaxy pairs in a merger sequence, from widely separated pairs to merger remnants. After the removal of contributions from unresolved point sources, we compared the diffuse thermal X-ray luminosity from hot gas (L X (gas)) with the global star formation rate (SFR). After correction for absorption within the target galaxy, we do not see a strong trend of L X (gas)/SFR with the SFR or merger stage for galaxies with SFR > 1 Myr -1 . For these galaxies, the median L X (gas)/SFR is 5.5 ×10 39 ((erg s -1 )/Myr -1 )), similar to that of normal spiral galaxies. These results suggest that stellar feedback in star-forming galaxies reaches an approximately steady-state condition, in which a relatively constant fraction of about 2% of the total energy output from supernovae and stellar winds is converted into X-ray flux. Three late-stage merger remnants with low SFRs and high K-band luminosities (L K ) have enhanced L X (gas)/SFR; their UV/IR/optical colors suggest that they are post-starburst galaxies, perhaps in the process of becoming ellipticals. Systems with L K < 10 10 L have lower L X (gas)/SFR ratios than the other galaxies in our sample, perhaps due to lower gravitational fields or lower metallicities. We see no relation between L X (gas)/SFR and Seyfert activity in this sample, suggesting that feedback from active galactic nuclei is not a major contributor to the hot gas in our sample galaxies.

    Related items

    Showing items related by title, author, creator and subject.

    • Multi-wavelength observations of the dissociative merger in the galaxy cluster ciza J0107.7+5408
      Randall, S.; Clarke, T.; Van Weeren, R.; Intema, Hubertus; Dawson, W.; Mroczkowski, T.; Blanton, E.; Bulbul, E.; Giacintucci, S. (2016)
      We present results based on X-ray, optical, and radio observations of the massive galaxy cluster CIZA J0107.7+5408. We find that this system is a post-core-passage, dissociative, binary merger, with the optical galaxy ...
    • Tracing low-mass galaxy clusters using radio relics: The discovery of Abell 3527-bis
      De Gasperin, F.; Intema, Hubertus; Ridl, J.; Salvato, M.; Van Weeren, R.; Bonafede, A.; Greiner, J.; Cassano, R.; Brüggen, M. (2017)
      Context. Galaxy clusters undergo mergers that can generate extended radio sources called radio relics. Radio relics are the consequence of merger-induced shocks that propagate in the intra cluster medium (ICM). Aims. In ...
    • A mildly relativistic wide-angle outflow in the neutron-star merger event GW170817
      Mooley, K.; Nakar, E.; Hotokezaka, K.; Hallinan, G.; Corsi, A.; Frail, D.; Horesh, A.; Murphy, T.; Lenc, E.; Kaplan, D.; De, K.; Dobie, D.; Chandra, P.; Deller, A.; Gottlieb, O.; Kasliwal, M.; Kulkarni, S.; Myers, S.; Nissanke, S.; Piran, T.; Lynch, Christene; Bhalerao, V.; Bourke, S.; Bannister, K.; Singer, L. (2018)
      GW170817 was the first gravitational-wave detection of a binary neutron-star merger1. It was accompanied by radiation across the electromagnetic spectrum and localized2 to the galaxy NGC 4993 at a distance of 40 megaparsecs. ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.