Dusty Gas and New Stars: Disruption of the High Velocity Intruder Galaxy Falling Towards NGC 1275

Type Conference Paper
Names John S. Gallagher, M. Lee, R. Canning, A. Fabian, R. W. O'Connell, J. Sanders, E. Zweibel
Proceedings Title Bulletin of the American Astronomical Society
Conference Name American Astronomical Society, AAS Meeting #215, #363.08
Volume 42
Pages 552
Date January 1, 2010
Short Title Dusty Gas and New Stars
URL http://adsabs.harvard.edu/abs/2010AAS...21536308G
Library Catalog NASA ADS
Abstract Among the many fascinating features of NGC1275, the brightest cluster galaxy in Perseus, is the high velocity optical emission line system (HVS) discovered by Minkowski 50 years ago. While subsequent studies show that the HVS arises from a spiral galaxy falling towards NGC1275 with a relative velocity of 3000 km/s, the details of this situation have remained elusive. We obtained a better view of the disrupting HVS galaxy by combining x-ray absorption measurements from Chandra with optical and far-UV imaging obtained with the Advanced Camera for Surveys on the Hubble Space Telescope. These data and comparisons with simulations of galaxies experiencing ram pressure stripping in clusters of galaxies suggest that: (1) gas is lost from the spiral in the form of large clouds or streamers, (2) many clouds support active star formation, and (3) star formation, like that within NGC1275, often yields luminous, compact star clusters. These phenomena resemble optically visible gas stripping events in other galaxy clusters, and suggest they define how cluster infall affects spiral galaxies. We also consider the implications of a possible eventual collision of the stripped HVS gas clouds with the massive warm ISM in NGC1275.
UW-Madison Astronomy Home