On the origin and excitation of the extended nebula surrounding NGC 1275

Details On the origin and excitation of the extended nebula surrounding NGC 1275 On the origin and excitation of the extended nebula surrounding NGC 1275

2005-12-13

arxiv.org/abs/astro-ph/0512331v1

Mon.Not.Roy.Astron.Soc.367:433-448,2006

Astronomy and Astrophysics

Astrophysics

13 pages, 17 figures. A version with full resolution figures is available at http://www-xray.ast.cam.ac.uk/~nah/MF1054rv.pdf

Scientific paper

10.1111/j.1365-2966.2006.09970.x

We use line-of-sight velocity information on the filamentary emission-line nebula of NGC 1275 to infer a dynamical model of the nebula's flow through the surrounding intracluster gas. We detect outflowing gas and flow patterns that match simulations of buoyantly rising bubbles from which we deduce that some of the nebula filaments have been drawn out of NGC 1275. We find a radial gradient of the ratio [NII]6584/H-alpha which may be due to a variation in metallicity, interactions with the surrounding intracluster medium or a hardening of the excitation mechanism. We find no preferred spatial correlation of stellar clusters within the filaments and there is a notable lack of [OIII]5007 emission, therefore it is unlikely that the filaments are ionized by stellar UV.

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