M 87 at metre wavelengths: the LOFAR picture

0 v 1 1 0 Ju n 20 00 M 87 at 90 cm : A Different Picture

We report new radio imaging of the large scale radio structure of M87 with the VLA at 90 cm. These new images show the complex structure of the radio emission more clearly than previous attempts, some of which date back to the 1940’s. The images suggest that the outward flow from the M87 nucleus extends well beyond the 2 kpc jet. Two “bubbles” of synchrotron emission appear to be inflated by th...

The inner accretion disk in M 87

The observed AGN in M87 is extremely quiescent compared to expectations based upon simple estimates for the mass accretion rate. We examine the possibility that the nal stages of accretion are advection dominated by comparing current observational constraints on the ux from the M87 core to the predictions of an advection dominated accretion ow (ADAF) model. We nd that the observed self-absorbed...

The “ quiescent ” black hole in M 87

It is believed that most giant elliptical galaxies possess nuclear black holes with masses in excess of 10 M⊙. Bondi accretion from the interstellar medium might then be expected to produce quasar-like luminosities from the nuclei of even quiescent elliptical galaxies. It is a puzzle that such luminosities are not observed. Motivated by this problem, Fabian & Rees have recently suggested that t...

Binocular Fixation for Scotometry at One Metre.

Hot and cold bubbles in M 87

The X-ray data obtained with XMM-Newton is used to investigate the complex structure of the gas in the atmosphere of the Virgo cluster around M87. We construct a simple model for the temperature and density distribution. This model implies that the cumulative mass of the cluster gas is a power-law of its entropy index, kT n−2/3, similar to the Hydra cluster. This supports the idea that such pow...