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THE LYMAN ALPHA REFERENCE SAMPLE: EXTENDED LYMAN ALPHA HALOS PRODUCED AT LOW DUST CONTENT
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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2013 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 765, no 2, L27- p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2013. Vol. 765, no 2, L27- p.
Keyword [en]
cosmology: observations, galaxies: evolution, galaxies: formation, galaxies: starburst, radiative transfer
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Astronomy
Identifiers
URN: urn:nbn:se:su:diva-88993DOI: 10.1088/2041-8205/765/2/L27ISI: 000315489100003OAI: oai:DiVA.org:su-88993DiVA: diva2:615381
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council
Note

AuthorCount:17;

Available from: 2013-04-10 Created: 2013-04-08 Last updated: 2017-12-06Bibliographically approved

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Östlin, GöranDuval, FlorentGuaita, LuciaMelinder, JensSandberg, Andreas
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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Astrophysical Journal Letters
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