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The Lyman alpha ref...
The Lyman alpha reference sample VI. Lyman alpha escape from the edge-on disk galaxy Mrk 1486
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- Duval, Florent (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),The University of Tokyo, Japan,Univ Tokyo, Inst Cosm Ray Res, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778582, Japan.;Stockholm Univ, Dept Astron, Oscar Klein Ctr, S-10691 Stockholm, Sweden.
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- Östlin, Göran (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),Stockholm Univ, Dept Astron, Oscar Klein Ctr, S-10691 Stockholm, Sweden.
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- Hayes, Matthew (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),Stockholm Univ, Dept Astron, Oscar Klein Ctr, S-10691 Stockholm, Sweden.
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- Zackrisson, Erik (author)
- Uppsala universitet,Observationell astrofysik
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- Verhamme, Anne (author)
- Univ Geneva, Observ Geneve, 51 Ch Maillettes, CH-1290 Versoix, Switzerland.
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- Orlitova, Ivana (author)
- Acad Sci Czech Republic, Inst Astron, Bocni 2-1401, Prague 14100, Czech Republic.
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- Adamo, Angela (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),Stockholm Univ, Dept Astron, Oscar Klein Ctr, S-10691 Stockholm, Sweden.
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- Guaita, Lucia (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),INAF Observatorio Astronomico di Roma, Italy,Stockholm Univ, Dept Astron, Oscar Klein Ctr, S-10691 Stockholm, Sweden.;INAF Observ Astron Roma, Via Frascati 33, I-00040 Monte Porzio Catone, RM, Italy.
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- Melinder, Jens (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),Stockholm Univ, Dept Astron, Oscar Klein Ctr, S-10691 Stockholm, Sweden.
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- Cannon, John M. (author)
- Macalester Coll, Dept Phys & Astron, 1600 Grand Ave, St Paul, MN 55105 USA.
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- Laursen, Peter (author)
- Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, Blegdamsvej 17, DK-2100 Copenhagen, Denmark.
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- Rivera-Thorsen, Thöger (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),Stockholm Univ, Dept Astron, Oscar Klein Ctr, S-10691 Stockholm, Sweden.
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- Herenz, E. Christian (author)
- Leibniz Inst Astrophys Potsdam, AIP, Sternwarte 16, D-14482 Potsdam, Germany.
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- Gruyters, Pieter (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),Stockholm Univ, Dept Astron, Oscar Klein Ctr, S-10691 Stockholm, Sweden.
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- Miguel Mas-Hesse, J. (author)
- Ctr Astrobiol CSIC INTA, Dept Astrofs, POB 78, Villanueva De La Canada 28691, Spain.
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- Kunth, Daniel (author)
- Inst Astrophys, 98bis Bd Arago, F-75014 Paris, France.
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- Sandberg, Andreas (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),Stockholm Univ, Dept Astron, Oscar Klein Ctr, S-10691 Stockholm, Sweden.
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- Schaerer, Daniel (author)
- Univ Geneva, Observ Geneve, 51 Ch Maillettes, CH-1290 Versoix, Switzerland.;CNRS, IRAP, 14 Ave E Belin, F-31400 Toulouse, France.
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- Månsson, Tore (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),Stockholm Univ, Dept Astron, Oscar Klein Ctr, S-10691 Stockholm, Sweden.
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(creator_code:org_t)
- 2016-02-19
- 2016
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 587
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Abstract
Subject headings
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- Context. Recent numerical simulations suggest that the strength of the Lyman alpha (Ly alpha) line of star-forming disk galaxies strongly depends on the inclination at which they are observed: from edge-on to face-on, we expect to see a change from a strongly attenuated Ly alpha line to a strong Ly alpha emission line.Aims. We aim to understand how a strong Ly alpha emission line is able to escape from the low-redshift highly inclined (edge-on) disk galaxy Mrk 1486 (z similar to 0.0338). To our knowledge, this work is the first observational study of Ly alpha transport inside an edge-on disk galaxy.Methods. Using a large set of HST imaging and spectroscopic data, we investigated the interstellar medium (ISM) structure and the dominant source of Ly alpha radiation inside Mrk 1486. Moreover, using a 3D Monte Carlo Ly alpha radiation transfer code, we studied the radiative transfer of Ly alpha and UV continuum photons inside a 3D geometry of neutral hydrogen (HI) and dust that models the ISM structure at the galaxy center. Our numerical simulations predicted the Ly alpha line profile that we then compared to the one observed in the HST/COS spectrum of Mrk 1486.Results. While a pronounced Ly alpha absorption line emerges from the disk of Mrk 1486, very extended Ly alpha structures are observed at large radii from the galaxy center: a large Ly alpha-halo and two very bright Ly alpha regions located slightly above and below the disk plane. The analysis of IFU H alpha spectroscopic data of Mrk 1486 indicates the presence of two bipolar outflowing halos of HI gas at the same location as these two bright Ly alpha regions. Comparing different diagnostic diagrams (such as [OIII](5007)/H beta versus [OI](6300)/H alpha) to photo-and shock-ionization models, we find that the Ly alpha production of Mrk 1486 is dominated by photoionization inside the galaxy disk. From this perspective, our numerical simulations succeed in reproducing the strength and shape of the observed Ly alpha emission line of Mrk 1486 by assuming a scenario in which the Ly alpha photons are produced inside the galaxy disk, travel along the outflowing halos, and scatter on cool HI materials toward the observer.Conclusions. Extended bipolar galactic winds are frequently observed from star-forming disk galaxies. Given the advantage Ly alpha photons take of such outflowing HI materials to easily escape from Mrk 1486, this mechanism may explain the origin of strong Ly alpha emission lines frequently observed from highly inclined galaxies at high-redshift. This therefore challenges the robustness of the expected viewing-angle effect on the Ly alpha properties of star-forming disk galaxies.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- galaxies: starburst
- galaxies: ISM
- submillimeter: galaxies
- radiative transfer
- line: profiles
- Astronomy
- astronomi
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Duval, Florent
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Östlin, Göran
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Hayes, Matthew
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Zackrisson, Erik
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Verhamme, Anne
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Orlitova, Ivana
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Adamo, Angela
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Guaita, Lucia
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Melinder, Jens
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Cannon, John M.
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Laursen, Peter
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Rivera-Thorsen, ...
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Herenz, E. Chris ...
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Gruyters, Pieter
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Miguel Mas-Hesse ...
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Kunth, Daniel
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Sandberg, Andrea ...
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Schaerer, Daniel
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Månsson, Tore
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- NATURAL SCIENCES
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Stockholm University
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Uppsala University