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Date and Time of the Query: 2019-05-24 T11:25:18 PDT
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For refcode 2007MNRAS.376..193J:
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Copyright by Royal Astronomical Society. 2007MNRAS.376..193J Active galactic nuclei heating in the centres of galaxy groups: a statistical study N. N. Jetha, T. J. Ponman, M. J. Hardcastle and J. H. Croston Abstract. We present gas temperature, density, entropy and cooling time profiles for the cores of a sample of 15 galaxy groups observed with Chandra. We find that the entropy profiles follow a power-law profile down to very small fractions of R_500_. Differences between the gas profiles of groups with radio-loud and radio-quiet brightest group galaxies are only marginally significant, and there is only a small difference in the L_X_: T_X_ relations, for the central regions we study with Chandra, between the radio-loud and radio-quiet objects in our sample, in contrast to the much larger difference found on scales of the whole group in earlier work. However, there is evidence, from splitting the sample based on the mass of the central black holes, that repeated outbursts of active galactic nuclei (AGN) activity may have a long-term cumulative effect on the entropy profiles. We argue that, to first order, energy injection from radio sources does not change the global structure of the gas in the cores of groups, although it can displace gas on a local level. In most systems, it appears that AGN energy injection serves primarily to counter the effects of radiative cooling, rather than being responsible for the similarity breaking between groups and clusters. Key words: galaxies: active, X-rays: galaxies: clusters =========================================================================== 2007MNRAS.378..384J Erratum: Active galactic nuclei heating in the centres of galaxy groups: a statistical study [Mon. Not. R. Astron. Soc. 376, 193-204.(2007)] Jetha, N. N.; Ponman, T. J.; Hardcastle, M. J.; Croston, J. H. Abstract. The paper 'Active galactic nuclei heating in the centres of galaxy groups: a statistical study' was published in Mon. Not. R. Astron. Soc. 376, 193-204. Following is a list of corrections to typographical errors (in order of appearance) which appeared in the article. (i) The author's email address is nazirah.jetha@cea.fr (ii) The ordinate of fig. 8 is incorrectly labelled as being the scaled cooling time. The cooling time data are in fact only scaled radially, as correctly stated in the text, and the ordinate label should simply read Tcool (Gyr) as shown in the corrected figure (Fig. 1) {see text}. Key words: errata, addenda, galaxies: active, X-rays: galaxies: clusters ===========================================================================
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