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Complex Spectral Variability from Intensive Multi-wavelength Monitoring of Mrk421 in 1998
T. Takahashi, J. Kataoka, G. Madejski +20
We conducted a multi-frequency campaign for the TeV blazar Mrk~421 in 1998 April. The campaign started from a pronounced high amplitude flare recorded by SAX and Whipple; ASCA obse…
The X-Ray Jet of PKS 0637-752: Inverse Compton Radiation from the Cosmic Microwave Background ?
F. Tavecchio, L. Maraschi R. M. Sambruna, C. M. Urry
We propose that the X-ray emission detected by Chandra from the 100-kiloparsec-scale jet of PKS 0637-752 is produced through inverse Compton scattering of the Cosmic Microwave Back…
On the Relation Between Radio and Non-Radio Elliptical Galaxies
Riccardo Scarpa, C. Megan Urry
Empirical evidence suggests that elliptical galaxies hosting a radio source may not be different from normal non-radio ellipticals. To test this possibility, we use Monte Carlo sim…
The HST Survey of BL Lacertae Objects: Morphological Properties of Low redshift Host Galaxies
R. Falomo, R. Scarpa, A. Treves +1
We report on the optical properties of a sample of 30 BL Lac host galaxies in the redshift range , as derived from HST observations. All galaxies are fully resolved in…
The HST Survey of BL~Lacertae Objects. IV. Infrared Imaging of Host Galaxies
Riccardo Scarpa, C. Megan Urry, Paolo Padovani +2
The HST NICMOS Camera 2 was used for H-band imaging of 12 BL Lacertae objects taken from the larger sample observed with the WFPC2 in the R band (Urry et al. 2000; Scarpa et al. 20…