The X-ray Brightest Group in the Sky - NGC 5044

Details The X-ray Brightest Group in the Sky - NGC 5044 The X-ray Brightest Group in the Sky - NGC 5044

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21922601d&link_type=abstract

American Astronomical Society, AAS Meeting #219, #226.01

Astronomy and Astrophysics

Astronomy

Scientific paper

A Chandra observation of the X-ray bright group NGC 5044 shows that the X-ray emitting gas in this system has been strongly perturbed by several recent AGN outbursts. The NGC 5044 group hosts many small X-ray cavities, cool filaments and cold fronts. The cool X-ray filaments share the same morphology as the Ha filaments. CO emission has also been detected in the center of the group were the X-ray emitting gas is the coldest. We can thus study the properties of the fully ionized, atomic and molecular gas in NGC 5044 to better understand the nature of the gas cooling. Low frequency GMRT observations revel a complicated radio morphology and show the presence of at least three separate outbursts. Some of the radio emission fills the larger X-ray cavities, but the smaller X-ray cavities remain undetected. Since the smaller bubbles are probably no longer momentum driven by the central AGN, their motion will be affected by the group "weather" as they buoyantly rise outward. A detailed spectroscopic analysis shows that the central region of NGC 5044 contains significant amounts of multiphase gas. The regions with the most inhomogeneous gas tend to correlate with the extended radio emission. This may result from gas entrainment within the radio emitting plasma. All of our results indicate that the gas re-heating mechanism in NGC 5044 is significantly different from that typically found in rich clusters, where powerful bi-polar radio outbursts are usually observed. In NGC 5044, the gas has probably been reheated by nearly continuous, weak AGN outbursts which produce weather-driven bubbles and a nearly isotropic deposition of energy.

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