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  • Puschnig, JohannesStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC) (author)

The Lyman continuum escape and ISM properties in Tololo 1247-232-new insights from HST and VLA

  • Article/chapterEnglish2017

Publisher, publication year, extent ...

  • 2017-04-21
  • Oxford University Press (OUP),2017
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:uu-333511
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-333511URI
  • https://doi.org/10.1093/mnras/stx951DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-147155URI

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  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Low- and intermediate-mass galaxies are widely discussed as cause of reionization at redshift z similar to 10-6. However, observational proof of galaxies that are leaking ionizing radiation (Lyman continuum; LyC) is a currently ongoing challenge and the list of LyC emitting candidates is still short. Tololo 1247-232 is among those very few galaxies with recently reported leakage. We performed intermediate resolution ultraviolet spectroscopy with the Cosmic Origins Spectrograph onboard the Hubble Space Telescope and confirm ionizing radiation emerging from Tololo 1247-232. Adopting an improved data reduction procedure, we find that LyC escapes from the central stellar clusters, with an escape fraction of 1.5 +/- 0.5 per cent only, i.e. the lowest value reported for the galaxy so far. We further make use of far-ultraviolet absorption lines of Si II and Si IV as a probe of the neutral and ionized interstellar medium ( ISM). We find that most of the ISM gas is ionized, likely facilitating LyC escape from density bounded regions. Neutral gas covering as a function of line-of-sight velocity is derived using the apparent optical depth method. The ISM is found to be sufficiently clumpy, supporting the direct escape of LyC photons. We further report on broad-band UV and optical continuum imaging as well as narrow-band imaging of Lya, Ha and H beta. Using stellar population synthesis, an Lya escape fraction of 8 per cent was derived. We also performed Very Large Array 21cm imaging. The hydrogen hyperfine transition was not detected, but a deep upper limit atomic gas mass of less than or similar to 10(9) M-circle dot could be derived. The upper limit gas fraction defined as M-HI/M-* is only 20 per cent. Evidence is found that the HI gas halo is relatively small compared to the Lyman Alpha Reference Sample (Hayes et al. 2013, 2014; Ostlin et al. 2014).

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  • Hayes, MatthewStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)mhaye (author)
  • Östlin, GöranStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)ostlin (author)
  • Rivera-Thorsen, Thøger EmilStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)trive (author)
  • Melinder, JensStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)jeand (author)
  • Cannon, J. M.Macalester Coll, Dept Phys & Astron, 1600 Grand Ave, St Paul, MN 55105 USA. (author)
  • Menacho, VeronicaStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)vmena (author)
  • Zackrisson, E.Uppsala Univ, Dept Phys & Astron, Lagerhyddsvagen 1, SE-75120 Uppsala, Sweden. (author)
  • Bergvall, NilsUppsala universitet,Observationell astrofysik(Swepub:uu)nilsberg (author)
  • Leitet, ElisabetUppsala universitet,Observationell astrofysik(Swepub:uu)elile746 (author)
  • Stockholms universitetInstitutionen för astronomi (creator_code:org_t)

Related titles

  • In:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)469:3, s. 3252-32690035-87111365-2966

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