ar X iv : a st ro - p h / 03 12 49 1 v 1 1 8 D ec 2 00 3 The role of Compton heating in cluster cooling flows
نویسنده
چکیده
Recent observations by Chandra and XMM-Newton demonstrate that the central gas in "cooling flow" galaxy clusters has a mass cooling rate that decreases rapidly with decreasing temperature. This contrasts the predictions of a steady state cooling flow model. On the basis of these observational results, the gas can be in a steady state only if a steady temperature dependent heating mechanism is present; alternatively the gas could be in an unsteady state, i.e., heated intermittently. Intermittent heating can be produced by accretion on the supermassive black hole residing in the central cluster galaxy, via Compton heating. This mechanism can be effective provided that the radiation temperature of the emitted spectrum is higher than the gas temperature. Here we explore whether this heating mechanism can be at the origin of the enigmatic behavior of the hot gas in the central regions of “cooling flow” clusters. Although several characteristics of Compton heating appear attractive in this respect, we find that the fraction of absorbed heating for realistic gas and radiation temperatures falls short by two orders of magnitude of the required heating.
منابع مشابه
ar X iv : a st ro - p h / 06 12 42 6 v 1 1 5 D ec 2 00 6 Heating and Cooling in the Perseus Cluster Core
متن کامل
ar X iv : a st ro - p h / 06 12 37 8 v 1 1 4 D ec 2 00 6 Magnetic fields , strings and cosmology
متن کامل
ar X iv : a st ro - p h / 06 10 95 0 v 1 3 1 O ct 2 00 6 Formation of cold molecular filaments in cooling flow clusters
New CO observations at the center of cooling flow in Perseus cluster [4] show a clear correlation of the molecular gas with the previously detected H-α filaments [1]. In this poster, we present high resolution multi-phase simulations of the Perseus Cluster, taking into account the AGN feedback in form of hot buoyant bubbles. These simulations show that significant amount of gas can cool far fro...
متن کاملar X iv : a st ro - p h / 03 12 49 6 v 1 1 8 D ec 2 00 3 GRB Redshift Evolution Within the Unified Jet Model
HETE-2 has provided new evidence that gamma-ray bursts may evolve with redshift [4]. We investigate the consequences of this possibility for the unified jet model of XRFs and GRBs [5]. We find that burst evolution with redshift can be naturally explained within the unified jet model, and the resulting model provides excellent agreement with existing HETE-2 and BeppoSAX data sets. In addition, t...
متن کاملar X iv : a st ro - p h / 01 12 42 3 v 1 1 8 D ec 2 00 1 The black hole mass of BL Lacs from stellar velocity dispersion of the host galaxy
The black hole mass of BL Lacs from stellar velocity dispersion of the host galaxy.
متن کامل