Buckling Bars in Nearly Face-on Galaxies Observed with MaNGA
Por:
Xiang K.M., Nataf D.M., Athanassoula E., Zakamska N.L., Rowlands K., Masters K., Fraser-Mckelvie A., Drory N., Kraljic K.
Publicada:
1 ene 2021
Resumen:
Over half of disk galaxies are barred, yet the mechanisms for bar formation and the lifetime of bar buckling remain poorly understood. In simulations, a thin bar undergoes a rapid (<1 Gyr) event called "buckling,"during which the inner part of the bar is asymmetrically bent out of the galaxy plane and eventually thickens, developing a peanut/X-shaped profile when viewed side-on. Through analyzing stellar kinematics of N-body model snapshots of a galaxy before, during, and after the buckling phase, we confirm a distinct quadrupolar pattern of out-of-plane stellar velocities in nearly face-on galaxies. This kinematic signature of buckling allows us to identify five candidates of currently buckling bars among 434 barred galaxies in the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) Survey, an integral field unit spectroscopic survey that measures the composition and kinematic structure of nearby galaxies. The frequency of buckling events detected is consistent with the 0.5-1 Gyr timescale predicted by simulations. The five candidates we present more than double the total number of candidate buckling bars and are the only ones found using the kinematic signature. © 2021. The American Astronomical Society. All rights reserved..
Filiaciones:
Xiang K.M.:
Center for Astrophysical Sciences, Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, United States
Department of Physics, Harvard University, Cambridge, MA 02138, United States
Nataf D.M.:
Center for Astrophysical Sciences, Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, United States
Athanassoula E.:
Aix Marseille Université, CNRS, CNES, LAM, Marseille, France
Zakamska N.L.:
Center for Astrophysical Sciences, Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, United States
Rowlands K.:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, United States
Masters K.:
Department of Physics and Astronomy, Haverford College, 370 Lancaster Avenue, Haverford, 19041, United States
Fraser-Mckelvie A.:
School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
Drory N.:
McDonald Observatory, University of Texas at Austin, 1 University Station, Austin, TX 78712, United States
Kraljic K.:
Aix Marseille Université, CNRS, CNES, LAM, Marseille, France
|