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  • Hayes, Matthew (author)

THE LYMAN ALPHA REFERENCE SAMPLE : EXTENDED LYMAN ALPHA HALOS PRODUCED AT LOW DUST CONTENT

  • Article/chapterEnglish2013

Publisher, publication year, extent ...

  • 2013
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-88993
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-88993URI
  • https://doi.org/10.1088/2041-8205/765/2/L27DOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

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

Notes

  • AuthorCount:17;
  • We report on new imaging observations of the Lyman alpha emission line (Ly alpha), performed with the Hubble Space Telescope, that comprise the backbone of the Lyman alpha Reference Sample. We present images of 14 starburst galaxies at redshifts 0.028 < z < 0.18 in continuum-subtracted Ly alpha, H alpha, and the far ultraviolet continuum. We show that Ly alpha is emitted on scales that systematically exceed those of the massive stellar population and recombination nebulae: as measured by the Petrosian 20% radius, RP20, Ly alpha radii are larger than those of H alpha by factors ranging from 1 to 3.6, with an average of 2.4. The average ratio of Ly alpha-to-FUV radii is 2.9. This suggests that much of the Ly alpha light is pushed to large radii by resonance scattering. Defining the Relative Petrosian Extension of Ly alpha compared to H alpha, xi(Ly alpha) = R-P20(Ly alpha)/R-P20(H alpha), we find xi(Ly alpha) to be uncorrelated with total Ly alpha luminosity. However, xi(Ly alpha) is strongly correlated with quantities that scale with dust content, in the sense that a low dust abundance is a necessary requirement (although not the only one) in order to spread Ly alpha photons throughout the interstellar medium and drive a large extended Ly alpha halo.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Östlin, GöranStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)ostlin (author)
  • Schaerer, Daniel (author)
  • Verhamme, Anne (author)
  • Mas-Hesse, J. Miguel (author)
  • Adamo, Angela (author)
  • Atek, Hakim (author)
  • Cannon, John M. (author)
  • Duval, FlorentStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)fduva (author)
  • Guaita, LuciaStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)lguai (author)
  • Herenz, E. Christian (author)
  • Kunth, Daniel (author)
  • Laursen, Peter (author)
  • Melinder, JensStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)jeand (author)
  • Orlitova, Ivana (author)
  • Oti-Floranes, Hector (author)
  • Sandberg, AndreasStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)ansa2525 (author)
  • Stockholms universitetInstitutionen för astronomi (creator_code:org_t)

Related titles

  • In:Astrophysical Journal Letters765:2, s. L27-2041-82052041-8213

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