# SDSS IV MaNGA - Rotation Velocity Lags in the Extraplanar Ionized Gas from MaNGA Observations of Edge-on Galaxies **Authors:** D. Bizyaev (1,2, 3), R. A. M. Walterbos (4), P. Yoachim, P. (5), R., A. Riffel, R. A. (6, 7), J. G. Fern\'andez-Trincado (8), K. Pan (1), A. M., Diamond-Stanic (9, 10), A. Jones (11), D. Thomas (12), J. Cleary (13) and, 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, Russia, (4) Department of Astronomy, New Mexico, State University, Las Cruces, NM, USA, (5) Department of Astronomy,, University of Washington, Seattle, WA, USA, (6) Departamento de F\'isica,, CCNE, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil, (7), Laborat\'orio Interinstitucional de e-Astronomia - LIneA, Rio de Janeiro, RJ,, Brazil, (8) Institut Utinam, Universit\'e de Franche-Comt\'e, OSU THETA, Franche-Comt\'e-Bourgogne, Observatoire de Besancon, Besanon Cedex, France,, (9) Department of Astronomy, University of Wisconsin-Madison, Madison, WI,, USA, (10) Department of Physics, Astronomy, Bates College, Lewiston, ME,, USA, (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) arXiv: 1704.02582 · 2017-04-26 ## TL;DR This study analyzes the rotation velocity lags of extraplanar ionized gas in edge-on galaxies using MaNGA data, revealing correlations with galaxy mass and structure, and highlighting the role of extraplanar gas in understanding galactic accretion. ## Contribution First detailed modeling of rotation velocity lags in extraplanar ionized gas across a significant galaxy sample, linking lag properties to galaxy mass and structure. ## Key findings - 37% of studied galaxies show regular rotation lags - Lag correlates with galaxy mass and stellar velocity dispersion - No correlation found between lag and star formation rate ## 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. ## Full text _Full body text omitted from this summary view._ Fetch the complete paper as Markdown: https://tomesphere.com/paper/1704.02582/full.md ## Figures 13 figures with captions in the complete paper: https://tomesphere.com/paper/1704.02582/full.md ## References 73 references — full list in the complete paper: https://tomesphere.com/paper/1704.02582/full.md --- Source: https://tomesphere.com/paper/1704.02582