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IFU investigation of possible Lyman continuum escape from Mrk 71/NGC 2366
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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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Number of Authors: 52019 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 623, article id A145Article in journal (Refereed) Published
Abstract [en]

Context. Mrk 71/NGC2366 is the closest green pea (GP) analog and candidate Lyman Continuum (LyC) emitter. Recently, 11 LyC-leaking GPs have been detected through direct observations of the ionizing continuum, making this the most abundant class of confirmed LyC-emitters at any redshift. High resolution, multiwavelength studies of GPs can lead to an understanding of the method(s), through which LyC escapes from these galaxies.

Aims. The proximity of Mrk 71/NCG2366 offers unprecedented detail on the inner workings of a GP analog, and enables us to identify the mechanisms of LyC escape.

Methods. We used 5825-7650 angstrom integral field unit PMAS observations to study the kinematics and physical conditions in Mrk 71. An electron density map was obtained from the [S II] ratio. A fortuitous second order contamination by the [O II] lambda 3727 doublet enabled the construction of an electron temperature map. Resolved maps of sound speed, thermal broadening, true velocity dispersion, and Mach number were obtained and compared to the high resolution magnetohydrodynamic SImulating the LifeCycle of molecular Clouds (SILCC) simulations.

Results. Two regions of increased velocity dispersion indicative of outflows are detected to the north and south of the super star cluster, knot B, with redshifted and blueshifted velocities, respectively. We confirm the presence of a faint broad kinematical component, which is seemingly decoupled from the outflow regions, and is fainter and narrower than previously reported in the literature. Within uncertainties, the low- and high-ionization gasses move together. Outside of the core of Mrk 71, an increase in Mach numbers is detected, implying a decrease in gas density. Simulations suggest this drop in density can be as high as similar to 4 dex, down to almost optically thin levels, which would imply a nonzero LyC escape fraction along the outflows even when assuming all of the detected II I gas is located in front of Mrk 71 in the line of sight.

Conclusions. Our results strongly indicate that kinematical feedback is an important ingredient for LyC leakage in GPs.

Place, publisher, year, edition, pages
2019. Vol. 623, article id A145
Keywords [en]
galaxies: individual: NGC2366/Mrk 71, galaxies: starburst, galaxies: kinematics and dynamics, HII regions
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-168358DOI: 10.1051/0004-6361/201834838ISI: 000462114600001OAI: oai:DiVA.org:su-168358DiVA, id: diva2:1318084
Available from: 2019-05-25 Created: 2019-05-25 Last updated: 2019-05-25Bibliographically approved

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Herenz, Edmund ChristianÖstlin, Göran
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