Takayuki Tamura Library

2017/01/22

A very deep Chandra observation of the Perseus cluster: shocks, ripples and conduction

http://adsabs.harvard.edu/abs/2006MNRAS.366..417F

http://chandra.harvard.edu/photo/2005/perseus/

Fig.3 Colour image made from the 0.3–1.2 (red), 1.2–2 (green) and 2–7 keV (blue) bands. A 10-arcsec smoothed image has been scaled to 80 per cent of its intensity and then subtracted in order to bring out fainter features lost in the high-intensity range of raw images. The blue structure to the N of the nucleus is caused by absorption in the infalling high-velocity system, We suspect that these arc-like pressure minima are old bubbles. projected at least 60 kpc in front of the nucleus of NGC 1275 (Gillmon, The large size of these bubbles could indicate that the activity was Sanders & Fabian 2004).

On the Nature of the NGC 1275 System

http://adsabs.harvard.edu/abs/2001AJ....122.2281C
http://iopscience.iop.org/article/10.1086/323534/fulltext/

from Introduction
NGC 1275 (PerseusA, 3C 84) isone of the mostunusual early-type galaxies inthe nearby universe andcontains an example ofalmost every known extragalacticphenomenon. However, several ofits basic observed featuresstill remain a mystery.NGC 1275 is locatedat the center ofthe Perseus Cluster andresembles a normal ellipticalgalaxy on low-resolution plates(Hubble & Humason 1931). Humason (1932) and laterSeyfert (1943) discovered strong emissionlines in NGC 1275.Later, Minkowski (1955) found twodistinct emission-line systems towardNGC 1275: a high-velocity(HV) component at V= 8200 km s^-1and a low-velocity (LV)one at V =5200 km s^-1. Thestellar radial velocity ofNGC 1275 is 5264± 11 km s^-1(Huchra, Vogeley, & Geller 1999), while the velocitydispersion of the PerseusCluster is 1277 kms^-1 (Struble & Rood 1991). The puzzlingnature of NGC 1275was compounded by thediscovery of an extensivearray of emission-line filamentsprojecting away from thecentral galaxy (Minkowski 1957; Lynds 1970).The origin of thesefeatures is still beingdebated (see, e.g., McNamara, O'Connell, & Sarazin 1996;Sabra, Shields, & Filippenko 2000).