Other
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe.174o&link_type=abstract
Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo
Other
Galaxies
Scientific paper
Galaxies play an important part in the development of the hot intergalactic medium in groups and clusters, heating and enriching the IGM through a variety of mechanisms. The combination of deep, high-resolution X-ray observations with multi-band, low-frequency radio data provides a powerful tool for the examination of shocks, star-formation and AGN activity, and the role of these processes in the formation and evolution of the hot IGM. As part of an ongoing study of the IGM in groups, we present results from Chandra and GMRT observations of Stephan's Quintet, a spiral-dominated system which appears to be in the process of building up a hot gaseous halo. Shock heating caused by the collision of a high-velocity intruder galaxy with tidally stripped HI produces a bright ridge of radio and X-ray emission, and the total mass of hot gas observed in the group is roughly equal to the deficit in HI compared to predictions, suggesting that most of the hot IGM is shock heated HI rather than accreted primordial material. With the combined observations we are able to separate the contributions of star-formation, shock emission and X-ray binaries within the ridge, and show that the star formation rate is comparable to the gas cooling rate in the ridge. We also examine the temperature structure of the hot gas, and place limits on the dynamics of the galaxy interaction and the energy of the shock. This system, along with other examples from our sample, demonstrates the worth of groups as a laboratory for studying galaxy and IGM evolution, and the benefits to be gained from a combined X-ray/radio approach.
David Laurence P.
Giacintucci Simona
O'Sullivan Ewan
Raychaudhury Somak
Vrtilek Jan M.
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