Search Publications
Internal structure and dynamics of the kiloparsec-scale jet in M87
Lobanov, Andrei; Hardee, Philip; Eilek, Jean
Detailed analysis of HST and VLA observations enables quantitative modeling of the internal structure of the kiloparsec-scale jet in M87. The jet transverse profiles can be modeled by double-Gaussian profiles. The jet structure is dominated by two threads resembling closely a double helix visible until about 20″ distance. It is produced by a combi…
New detections of optical emission from kiloparsec-scale quasar jets
Cheung, C. C.; Wardle, J. F. C.; Chen, Tingdong +1 more
We report initial results from the detection of optical emission in the arcsecond-scale radio jets of two quasars utilizing images from the Hubble Space Telescope archive. The optical emission has a very knotty appearance and is consistent with synchrotron emission from highly relativistic electrons in the jet. Combining these observations with th…
Multiwavelength imaging of kpc-scale jets in AGN with Chandra and HST
Sambruna, Rita M.
I highlight recent developments from Chandra and HST observations of kpc-scale jets in AGN, with particular emphasis on our survey of 17 radio jets in a sample of FR II radio galaxies. These observations show that: (1) X-ray and optical emission is common from kpc-scale jets, (2) a large fraction of the bolometric luminosity is emitted at X-rays, …
6C radio galaxies at z∼1: the influence of radio power on the alignment effect
Best, Philip N.; Inskip, Katherine J.; Longair, Malcolm S.
Powerful radio galaxies often display enhanced optical/UV continuum emission and extended emission line regions, elongated and aligned with the radio jet axis. The expansion of the radio source strongly affects the gas clouds in the surrounding IGM, and the kinematic and ionization properties of the extended emission line regions display considera…
Quasar hosts: differences between radio-loud and radio-quiet galaxies
Kukula, Marek J.
Strong evidence exists that radio-loud quasars and FR II radio galaxies differ only in the orientation of their central AGN, and HST studies of quasar hosts have confirmed that there are no significant differences between radio galaxies and the massive elliptical galaxies which host RLQs. Detailed studies of radio-quiet quasars show that these pow…
Radio galaxy host properties spanning three dex in radio luminosity
Willott, Chris J.; Rawlings, Steve; Jarvis, Matt J. +4 more
We describe a major study of radio source host galaxies being carried out with the HST and ground-based facilities. Our sample is selected from 4 complete samples with different radio flux-density limits, giving a range of three orders of magnitude in radio luminosity at a fixed epoch ( z=0.5). High-resolution HST WFPC2 imaging shows that all 44 r…
X-ray emission diagnostics from the M87 jet
Wilson, A. S.; Perlman, E. S.
We use Chandra, HST and VLA observations of M87 to investigate the physics of X-ray emission from AGN jets. We find that X-ray hotspots in the M87 jet occur primarily in regions with hard optical-to-X-ray spectra and lower than average polarization. Particle injection appears to be required both continuously in the jet sheath as well as locally at…
Two new optical jets in B2 radio galaxies
Bondi, M.; Capetti, A.; Morganti, R. +5 more
We present HST observations of previously undetected optical jets in the low-luminosity radio galaxies B2 0755+37 and B2 1553+24. We show that there is accurate spatial coincidence between optical and radio emission, implying that the former is likely to be synchrotron radiation. The physical properties of the jets are similar to those known previ…