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SDSS IV MaNGA - Rotation Velocity Lags in the Extraplanar Ionized Gas from MaNGA Observations of Edge-on Galaxies

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arxiv 1704.02582 v1 pith:5A7UF7GR submitted 2017-04-09 astro-ph.GA

D. Bizyaev (1 , 2 , 3) , R. A. M. Walterbos (4) , P. Yoachim , P. (5) , R. A. Riffel , R. A. (6
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7) J. G. Fernández-Trincado (8) K. Pan (1) A. M. Diamond-Stanic (9 10) A. Jones (11) D. Thomas (12) J. Cleary (13) J. Brinkmann (1) ((1) Apache Point Observatory New Mexico State University Sunspot NM USA (2) Sternberg Astronomical Institute Moscow State University Moscow Russia (3) Special Astrophysical Observatory of the RAS Nizhnij Arkhyz (4) Department of Astronomy Las Cruces (5) Department of Astronomy University of Washington Seattle WA (6) Departamento de Física CCNE Universidade Federal de Santa Maria Santa Maria RS Brazil (7) Laboratório Interinstitucional de e-Astronomia - LIneA Rio de Janeiro RJ (8) Institut Utinam Université de Franche-Comté OSU THETA Franche-Comté-Bourgogne Observatoire de Besancon Besanon Cedex France (9) Department of Astronomy University of Wisconsin-Madison Madison WI (10) Department of Physics Astronomy Bates College Lewiston ME (11) Max-Planck Institute for Astrophysics Garching Germany (12) Institute of Cosmology Gravitation University of Portsmouth Portsmouth UK (13) Department of Physics & Astronomy Johns Hopkins University Baltimore MD USA)
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abstract

We present a study of the kinematics of the extraplanar ionized gas around several dozen galaxies observed by the Mapping of Nearby Galaxies at the Apache Point Observatory (MaNGA) survey. We considered a sample of 67 edge-on galaxies out of more than 1400 extragalactic targets observed by MaNGA, in which we found 25 galaxies (or 37%) with regular lagging of the rotation curve at large distances from the galactic midplane. We model the observed $H\alpha$ emission velocity fields in the galaxies, taking projection effects and a simple model for the dust extinction into the account. We show that the vertical lag of the rotation curve is necessary in the modeling, and estimate the lag amplitude in the galaxies. We find no correlation between the lag and the star formation rate in the galaxies. At the same time, we report a correlation between the lag and the galactic stellar mass, central stellar velocity dispersion, and axial ratio of the light distribution. These correlations suggest a possible higher ratio of infalling-to-local gas in early-type disk galaxies or a connection between lags and the possible presence of hot gaseous halos, which may be more prevalent in more massive galaxies. These results again demonstrate that observations of extraplanar gas can serve as a potential probe for accretion of gas.

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