VLBA polarimetric observations of the CSS quasar 3C147 (2009)
Rossetti, A., Mantovani, F., Dallacasa, D., Junor, W., Salter, C. J., Saikia, D. J.
Aims. We report new VLBA polarimetric observations of the compact steep-spectrum (CSS) quasar 3C147 (B0538+498) at 5 and 8.4GHz. Methods. By using multifrequency VLBA observations, we derived...
Ardavan, H., Ardavan, A., Singleton, J., Fasel, J., Junor, W., Middleditch, J., ...
The observed spectra of 9 pulsars for which multiwavelength data are available from radio to $X$- or $\gamma$-ray bands (Crab, Vela, Geminga, B0656+14, B1055-52, B1509-58, B1706-44, B1929+10, and...
Progress Toward a VLBA Movie of the Jet Collimation Region in M87 (2007)
Walker, R. C., Ly, C., Junor, W., Hardee, P. E.
With its high black hole mass, proximity, and bright jet, M87 provides the best prospect for a direct imaging study of the acceleration and collimation region of a jet. Previous VLBI observations...
The Outburst of HST-1 in the M87 Jet (2005)
Harris, D. E., Cheung, C. C., Biretta, J. A., Sparks, W., Junor, W., Perlman, E. S., ...
The X-ray intensity of knot HST-1, 0.85" from the nucleus of the radio galaxy M87, has increased by more than a factor of 50 during the last 5 years. The optical increase is similar and our more...
Flaring X-ray Emission from HST-1, a Knot in the M87 Jet (2003)
Harris, D. E., Biretta, J. A., Junor, W., Perlman, E. S., Sparks, W. B., Wilson, A. S.
We present Chandra X-ray monitoring of the M87 jet in 2002, which shows that the intensity of HST-1, an optical knot 0.8" from the core, increased by a factor of two in 116 days and a factor of four...
B1524-136: A CSS quasar with two-sided radio jets (2002)
Mantovani, F., Saikia, D. J., Bondi, M., Junor, W., Salter, C. J., Ricci, R.
We present MERLIN, global VLBI and VLBA observations of the high-luminosity, compact steep-spectrum quasar B1524$-$136 at cm wavelengths. These observations reveal well-defined radio jets on both...
Milli-arcsecond scale Rotation Measure in the CSS Quasars 0548+165 and 1524-136 (2002)
Mantovani, F., Junor, W., Ricci, R., Saikia, D. J., Salter, C., Bondi, M.
Two Compact Steep-spectrum Sources (CSSs), 0548+165 and 1524-136, chosen from a list of CSSs with polarization percentages that decrease with decreasing frequency and high rotation measure values (RM...
VLA Polarimetry of Two Extended Radio Galaxies (2000)
Junor, W., Mantovani, F., Morganti, R., Padrielli, L.
Multi-wavelength VLA observations of two extended radio galaxies, 0235-197 and 1203+043 are presented. There is some evidence from earlier studies that these two sources exhibit low frequency (
A Comparison of the Extra Nuclear X-ray and Radio Features in M87 (2000)
Harris, D. E., Owen, F., Biretta, J. A., Junor, W.
ROSAT High Resolution Imager (HRI) data from eight observations have been co-added to obtain an effective exposure of 230 ksec. We have identified a number of features and regions with excess X-ray...
VLBI observations of 3C273 at 22 GHz and 43 GHz. II: test of Synchrotron Self-Compton process (1999)
Mantovani, F., Junor, W., McHardy, I. M., Valerio, C.
The VLBI observations at 22 GHz and 43 GHz of the quasar 3C273 obtained during a multi-frequency campaign in late 1992 in the radio, millimetre and X-ray bands allow us to derive the components'...
Mantovani, F., Junor, W., Valerio, C., McHardy, I.
The results of VLBI observations of the quasar 3C273, obtained during a multi-frequency campaign in late 1992 in the radio, millimeter and X-ray bands are presented and discussed. The VLBI...
Multiwavelength observations of 26W20, a radio galaxy which displays BL Lac characteristics (1998)
Silverman, J. D., Harris, D. E., Junor, W.
26W20, a radio galaxy located at a projected distance of 2.2 Mpc from the center of Abell 754 (z=0.054) exhibits core emission properties similar to those of a BL Lac object. New radio observations...
The Large Scale X-ray Emission from M87 (1998)
Harris, D. E., Biretta, J. A., Junor, W.
We describe asymmetrical features in a long exposure X-ray map of M87 made with the ROSAT High Resolution Imager (HRI). A bright triangular region is marked by a linear `spur' along one edge. The...
X-ray Variability in M87: 1992 - 1998 (1998)
Harris, D. E., Biretta, J. A., Junor, W.
Beginning in 1995 June, we have obtained an observation of M87 with the ROSAT High Resolution Imager (HRI) every 6 months. We present the measurements of X-ray intensity for the core and knot A...
Large bent jets in the inner region of CSSs (1997)
Mantovani, F., Junor, W., Bondi, M., Cotton, W., Fanti, R., Padrielli, L., ...
The class of Compact Steep-spectrum Sources is dominated by double-lobed objects (70%). The remaining 30% are jet-dominated objects, with the jet brightened either by Doppler boosting or by...
X-ray variability in M87 (1996)
Harris, D. E., Biretta, J. A., Junor, W.
We present the evidence for X-ray variability from the core and from knot A in the M87 jet based on data from two observations with the Einstein Observatory High Resolution Imager (HRI) and three...
We briefly review the observed structure and evolution of the M87 jet on scales less, similar1 parsec (pc; 1 pc = 3.09 x 10(16) m). Filamentary features, limb-brightening, and side-to-side...
We briefly review the observed structure and evolution of the M87 jet on scales less, similar1 parsec (pc; 1 pc = 3.09 x 10(16) m). Filamentary features, limb-brightening, and side-to-side...