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Post Info TOPIC: NGC 6764


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Posts: 131433
Date:
PGC 62806
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NGC 6764 (also IRAS 19070+5051, MCG 8-35-3, UGC 11407 and PGC 62806) is a magnitude +11.9 barred spiral galaxy located 111 million light-years away in the constellation Cygnus.

The galaxy was discovered by American astronomer Lewis A. Swift using a 40.6 cm (16 inch) Alvan Clark and Sons refractor at the Warner Observatory, East Avenue, Rochester, New York, on the 4th July 1885.

Right Ascension 19h 08m 16.6s, Declination +50 55' 59"



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Posts: 131433
Date:
NGC 6764
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Title: Chandra evidence for AGN feedback in the spiral galaxy NGC 6764
Authors: J.H. Croston, M.J. Hardcastle, P. Kharb, R.P. Kraft, A. Hota
(Version v2)

We report the Chandra detection of X-ray emission spatially coincident with the kpc-scale radio bubbles in the nearby (D_L ~ 31 Mpc) AGN-starburst galaxy NGC 6764. The X-ray emission originates in hot gas (kT ~ 0.75 keV), which may either be contained within the radio bubbles, or in a shell of hot gas surrounding them. We consider three models for the origin of the hot gas: (1) a starburst-driven galactic wind, (2) shocked gas associated with the expanding radio bubbles, and (3) gas heated and entrained into the bubbles by jet/ISM interactions in the inner AGN outflow. We rule out a galactic wind based on significant differences from known galactic wind systems. The tight correspondence between the brightest X-ray emission and the radio emission in the inner outflow from the Seyfert nucleus, as well as a correlation between X-ray and radio spectral features suggestive of shocks and particle acceleration, lead us to favour the third model; however, we cannot firmly rule out a model in which the bubbles are driving large-scale shocks into the galaxy ISM. In either AGN-driven heating scenario, the total energy stored in the hot gas is high, ~10^56 ergs, comparable to the energetic impact of low-power radio galaxies such as Centaurus A, and will have a dramatic impact on the galaxy and its surroundings.

Read more (565kb, PDF)

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