The Collisional Debris of NGC 4438

Details The Collisional Debris of NGC 4438 The Collisional Debris of NGC 4438

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6791k&link_type=abstract

HST Proposal ID #6791

Physics

Hst Proposal Id #6791 Galaxies &Amp, Clusters

Scientific paper

We propose to image the center of the peculiar Virgo cluster galaxy NGC 4438 with WFPC2 in 3 broadband {B, R, I} and 2 narrowband {HAlpha, NII} filters, and the central field of NGC 4435 in 3 broadband {B, R, I} filters. NGC 4438 and NGC 4435 have experienced a recent high-velocity {900 km s^-1} collision, and NGC 4438 has a strongly disturbed ISM attributable to a high-velocity ISM-ISM collision. In order to assess how the collision has changed NGC 4438, we wish to search for evidence of recent and ongoing star and cluster formation in the collisional debris. Ground-based images reveal features suggesting that collisionally-induced star formation may be widespread in NGC 4438: 1.} Unresolved continuum sources peppered throughout the debris, suggesting that high-velocity collisions produce halo globular clusters. 2.} A highly disturbed central ISM with strong CO, HAlpha, and x-ray emission, and LINER line ratios. 3.} Ionized gas filaments which extend outwards from one side of the disk, which may be cooling gas resettling into NGC 4438 in the aftermath of the collision. High resolution HST HAlpha, NII line and B, R, I images are required to resolve star clusters, and to identify compact HII regions within a disturbed ISM which is predominantly shock-excited. This system is the nearest example of a recent and close high-velocity collision between 2 large galaxies, and offers a unique opportunity to learn about the physical processes in high-velocity collisions which can transform cluster galaxies.

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