Warp Characteristics of Spiral Galaxies in the Virgo Cluster

Details Warp Characteristics of Spiral Galaxies in the Virgo Cluster Warp Characteristics of Spiral Galaxies in the Virgo Cluster

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934614b&link_type=abstract

American Astronomical Society, AAS Meeting #219, #346.14

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Scientific paper

We present the warp characteristics of 22 spiral galaxies in the Virgo cluster based on their VLA HI datacubes with unprecedented precision. The tilted-ring modeling method is used to examine kinematic properties of the HI disks including the inclination and position angle. The main results are as follows. First, 17 out of the 19 (89.5 %) successfully-modeled galaxies exhibit either weak or strong warps, indicating that the warps are very common not only galaxies in isolation but ones in dense environments. Second, the warp strength decreases with increasing dynamical mass, supporting the notion that the warps are primarily controlled by dark matter halos. Last, the warp characteristics in our sample are distinct from those of isolated galaxies, in that the warps in our sample varies a great deal in inclination, but little in position angle. This implies that in dense environments, the main driver of the disk warps is most likely the galactic tidal interaction, rather than other explanations such as the cosmic infall scenario.

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