Zobrazeno 1 - 10
of 56
pro vyhledávání: '"Lovell, James E. J."'
Autor:
Schwartz, Daniel A, Marshall, Herman L, Worrall, Diana M, Birkinshaw, Mark, Perlman, Eric, Lovell, James E J, Jauncey, David, Murphy, David, Gelbord, Jonathan, Godfrey, Leith, Bicknell, Geoffrey
We have completed a Chandra snapshot survey of 54 radio jets that are extended on arcsec scales. These are associated with flat spectrum radio quasars spanning a redshift range z=0.3 to 2.1. X-ray emission is detected from the jet of approximately 60
Externí odkaz:
http://arxiv.org/abs/1505.06990
Autor:
Meyer, Eileen T., Georganopoulos, Markos, Sparks, William B., Godfrey, Leith, Lovell, James E. J., Perlman, Eric
The Chandra X-ray observatory has discovered dozens of resolved, kiloparsec-scale jets associated with powerful quasars in which the X-ray fluxes are observed to be much higher than the expected level based on the radio-optical synchrotron spectrum.
Externí odkaz:
http://arxiv.org/abs/1504.00577
Autor:
Green, Claire-Elise, Green, James A., Burton, Michael G., Horiuchi, Shinji, Tothill, Nicholas F. H., Walsh, Andrew J., Purcell, Cormac R., Lovell, James E. J., Millar, Thomas J.
We present new detections of cyanodiacetylene (HC$_{5}$N) toward hot molecular cores, observed with the Tidbinbilla 34 m radio telescope (DSS-34). In a sample of 79 hot molecular cores, HC$_{5}$N was detected towards 35. These results are counter to
Externí odkaz:
http://arxiv.org/abs/1407.1699
Autor:
Pursimo, Tapio, Ojha, Roopesh, Jauncey, David L., Rickett, Barney J., Dutka, Michael S., Koay, Jun Yi, Lovell, James E. J., Bignall, Hayley E., Kedziora-Chudczer, Lucyna, Macquart, Jean-Pierre
Intraday variability (IDV) of the radio emission from active galactic nuclei is now known to be predominantly due to interstellar scintillation (ISS). The MASIV (The Micro-Arcsecond Scintillation-Induced Variability) survey of 443 flat spectrum sourc
Externí odkaz:
http://arxiv.org/abs/1302.3409
Autor:
Mao, Minnie Y., Sharp, Rob, Norris, Ray P., Hopkins, Andrew M., Seymour, Nick, Lovell, James E. J., Middelberg, Enno, Randall, Kate E., Sadler, Elaine M., Saikia, D. J., Shabala, Stanislav S., Zinn, Peter-Christian
The Australia Telescope Large Area Survey (ATLAS) has surveyed seven square degrees of sky around the Chandra Deep Field South (CDFS) and the European Large Area ISO Survey - South 1 (ELAIS-S1) fields at 1.4 GHz. ATLAS aims to reach a uniform sensiti
Externí odkaz:
http://arxiv.org/abs/1208.2722
Autor:
Blanchard, Jay M., Lovell, James E. J., Ojha, Roopesh, Kadler, Matthias, Dickey, John M., Edwards, Philip G.
Context. Frequent, simultaneous observations across the electromagnetic spectrum are essential to the study of a range of astrophysical phenomena including Active Galactic Nuclei. A key tool of such studies is the ability to observe an object when it
Externí odkaz:
http://arxiv.org/abs/1201.5159
We have used the University of Tasmania's 30 m radio telescope at Ceduna in South Australia to regularly monitor the flux density of a number of southern blazars. We report the detection of an annual cycle in the variability timescale of the centimet
Externí odkaz:
http://arxiv.org/abs/0903.5384
Autor:
Winn, Joshua N., Lovell, James E. J., Bignall, Hayley, Gaensler, Bryan M., Getts, Tracy J., Kedziora-Chudczer, Lucyna, Ojha, Roopesh, Reynolds, John E., Tingay, Steven J., Tzioumis, Tasso, Wieringa, Mark
We present the results of a radio variability study of the gravitational lens PMN J1838-3427. Our motivation was to determine the Hubble constant by measuring the time delay between variations of the two quasar images. We monitored the system for 4 m
Externí odkaz:
http://arxiv.org/abs/astro-ph/0409206
Publikováno v:
Astrophys.J.590:26-38,2003
We present results from high-resolution radio and optical observations of PMN J0134-0931, a gravitational lens with a unique radio morphology and an extremely red optical counterpart. Our data support the theory of Keeton & Winn (2003): five of the s
Externí odkaz:
http://arxiv.org/abs/astro-ph/0302364
Autor:
Winn, Joshua N., Lovell, James E. J., Chen, Hsiao-Wen, Fletcher, Andre B., Hewitt, Jacqueline N., Patnaik, Alok R., Schechter, Paul L.
The radio-loud quasar PMN J0134-0931 was discovered to have an unusual morphology during our search for gravitational lenses. In VLA and MERLIN images, there are 5 compact components with maximum separation 681 millarcseconds. All of these components
Externí odkaz:
http://arxiv.org/abs/astro-ph/0107435