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Mass of BL Lacs from the Velocity Dispersion of the Host Galaxy
A. Treves, N. Carangelo, R. Falomo +1
We report on new measurements of the stellar velocity dispersion of 4 BL Lac objects for which optical spectroscopy was gathered at the ESO 3.6m using EFOSC2. Assuming the M(BH)--(…
Young compact objects in the Solar vicinity
S. B. Popov, M. E. Prokhorov, M. Colpi +2
We present Log N -- Log S distribution for close-by young isolated neutron stars. On the basis of this distribution it is shown that the seven ROSAT isolated neutron stars (if they…
Black hole masses of BL Lac objects
J. K. Kotilainen, R. Falomo, A. Treves
The correlation between black hole mass M(BH) and the central stellar velocity dispersion sigma in nearby elliptical galaxies affords a novel way to determine M(BH) in active galax…
BL Lacertae: complex spectral variability and rapid synchrotron flare detected with BeppoSAX
M. Ravasio, G. Tagliaferri, G. Ghisellini +23
We report on two BeppoSAX observations of BL Lac (2200+420) performed respectively in June and December 1999, as part of a ToO program to monitor blazars in high states of activity…
Young close isolated compact objects
S. B. Popov, M. E. Prokhorov, M. Colpi +2
We suggest that the seven radio-quiet isolated neutron stars observed with ROSAT are young cooling objects associated to recent near-by supernova explosions which formed runaway st…