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The Lyman alpha reference sample VI. Lyman alpha escape from the edge-on disk galaxy Mrk 1486
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SYSNO ASEP 0471836 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The Lyman alpha reference sample VI. Lyman alpha escape from the edge-on disk galaxy Mrk 1486 Author(s) Duval, F. (SE)
Ostlin, G. (SE)
Hayes, M. (SE)
Zackrisson, E. (SE)
Verhamme, A. (CH)
Orlitová, Ivana (ASU-R) RID, ORCID
Adamo, A. (SE)
Guaita, L. (SE)
Melinder, J. (SE)
Cannon, J.M. (US)
Laursen, P. (DK)
Rivera-Thorsen, T. (SE)
Herenz, E.Ch. (DE)
Gruyters, P. (SE)
Mas-Hesse, J. M. (ES)
Kunth, D. (FR)
Sandberg, A. (SE)
Schaerer, D. (FR)
Mansson, J.-E. (SE)Source Title Astronomy & Astrophysics. - : EDP Sciences - ISSN 0004-6361
Roč. 587, March (2016), A77/1-A77/24Number of pages 24 s. Publication form Online - E Language eng - English Country FR - France Keywords galaxies ; starburst ; submillimeter Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics OECD category Astronomy (including astrophysics,space science) R&D Projects GP14-20666P GA ČR - Czech Science Foundation (CSF) Institutional support ASU-R - RVO:67985815 UT WOS 000371589800088 EID SCOPUS 84959018436 DOI https://doi.org/10.1051/0004-6361/201526876 Annotation 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.
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.Workplace Astronomical Institute Contact Anežka Melichárková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2017
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