The proto-planetary nebula Hen 3-1475 (IRAS 17423--1755) shows a remarkable highly--collimated optical jet with a spectacular S-shaped string of shock-excited knots (Bobrowsky et al. 1995, Riera et al. 1995, Borkowski et al. 1997). Moreover, extremely high velocities have been observed in the innermost regions of its optical jet, which decreases

We present multiwavelength monitoring of the Galactic microquasar GRS1915+105 in the infrared, X-ray, and radio bands using observations from the Whipple Observatory 1.2-m, Lowell Observatory 1.8-m, Palomar 5-m, and the United Kingdom Infrared telescopes, the Rossi X-ray Timing Explorer All-Sky Monitor, and the Green Bank Interferometer during May

Integral field optical spectroscopy using the INTEGRAL system, complemented with HST imaging, has been used to characterize the merging process giving rise to the ultraluminous infrared galaxy IRAS 08572+3915, the star formation along the tidal tails of the galaxy, and the nature of the nuclear ionizing sources deep within the galaxy. The overall

We have obtained HST-NICMOS observations of five of M31's most metal rich globular clusters: G1, G170, G174, G177 & G280. In order to disentangle the true properties of the population from the observational effects associated with measurements made in very crowded fields, we first present a careful analysis of photometry in crowded regions. Here we

Several kiloparsec-scale X-ray jets have now been discovered with the Chandra X-ray Observatory, extending up to ~50 kpc (projected distance) from the active galactic nucleus in which the jet originates. In all cases, these jets also emit radio and optical light, which can be well explained as synchrotron radiation. We suggest that in at least some

Simultaneous time series of broadband images of two active regions close to the disk center were acquired at the Swedish Vacuum Solar Telescope, La Palma, in the infrared bands at 1.55 and 0.80 μm, corresponding to the minimum and maximum continuum opacities, respectively. Dark faculae are detected in images obtained as weighted intensity