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of 76
pro vyhledávání: '"Richards Joseph L."'
Autor:
Richards Joseph L., Hovatta Talvikki, Lister Matthew L., Readhead Anthony C. S., Max-Moerbeck Walter, Savolainen Tuomas, Angelakis Emmanouil, Fuhrmann Lars, Aller Margo F., Aller Hugh D., Myserlis Ioannis, Karamanavis Vassilis
Publikováno v:
EPJ Web of Conferences, Vol 61, p 04010 (2013)
In September 2012, the high-synchrotron-peaked (HSP) blazar Markarian 421 underwent a rapid wideband radio flare, reaching nearly twice the brightest level observed in the centimeter band in over three decades of monitoring. In response to this event
Externí odkaz:
https://doaj.org/article/88ace7d6ef5a42bd87eb3ef3ef849ee3
Akademický článek
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Autor:
Berton, Marco, Foschini, Luigi, Ciroi, Stefano, Cracco, Valentina, La Mura, Giovanni, Lister, Matthew L., Mathur, Smita, Peterson, Bradley M., Richards, Joseph L., Rafanelli, Piero
Publikováno v:
A&A 578, A28 (2015)
Flat-spectrum radio-loud Narrow-Line Seyfert 1 galaxies (NLS1s) are a recently discovered class of $\gamma$-ray emitting Active Galactic Nuclei (AGN), that exhibit some blazar-like properties which are explained with the presence of a relativistic je
Externí odkaz:
http://arxiv.org/abs/1504.02772
Publikováno v:
Astrophys.J. 800 (2015) L8
We have discovered kiloparsec-scale extended radio emission in three narrow-line Seyfert 1 galaxies (NLS1s) in sub-arcsecond resolution 9 GHz images from the Karl G. Jansky Very Large Array (VLA). We find all sources show two-sided, mildly core-domin
Externí odkaz:
http://arxiv.org/abs/1501.05299
Autor:
Richards, Joseph L., Hovatta, Talvikki, Max-Moerbeck, Walter, Pavlidou, Vasiliki, Pearson, Timothy J., Readhead, Anthony C. S.
We present results from four years of twice-weekly 15 GHz radio monitoring of about 1500 blazars with the Owens Valley Radio Observatory 40 m telescope. Using the intrinsic modulation index to measure variability amplitude, we find that, with $>\!6\s
Externí odkaz:
http://arxiv.org/abs/1312.3634
Autor:
Shaw, Michael S., Romani, Roger W., Cotter, Garret, Healey, Stephen E., Michelson, Peter F., Readhead, Anthony C. S., Richards, Joseph L., Max-Moerbeck, Walter, King, Oliver G., Potter, William J.
We report on spectroscopic observations covering most of the 475 BL Lacs in the 2nd Fermi LAT catalog of AGN. Including archival measurements (correcting several erroneous literature values) we now have spectroscopic redshifts for 44% of the BL Lacs.
Externí odkaz:
http://arxiv.org/abs/1301.0323
Autor:
Shaw, Michael S., Romani, Roger W., Cotter, Garret, Healey, Stephen E., Michelson, Peter F., Readhead, Anthony C. S., Richards, Joseph L., Max-Moerbeck, Walter, King, Oliver G., Potter, William J.
We report on optical spectroscopy of 165 Flat Spectrum Radio Quasars (FSRQs) in the Fermi 1LAC sample, which have helped allow a nearly complete study of this population. Fermi FSRQ show significant evidence for non-thermal emission even in the optic
Externí odkaz:
http://arxiv.org/abs/1201.0999
Autor:
Linford, Justin D., Taylor, Gregory B., Romani, Roger W., Helmboldt, Joseph F., Readhead, Anthony C. S., Reeves, Rodrigo, Richards, Joseph L.
The radio properties of blazars detected by the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope have been observed contemporaneously by the Very Long Baseline Array (VLBA). In total, 232 sources were observed with the VLBA. Ni
Externí odkaz:
http://arxiv.org/abs/1111.4505
Autor:
Richards, Joseph L., Max-Moerbeck, Walter, Pavlidou, Vasiliki, Readhead, Anthony C. S., Pearson, Timothy. J., King, Oliver G., Reeves, Rodrigo, Stevenson, Matthew A., Shepherd, Martin C.
Since late 2007, we have been monitoring a large sample of known and likely gamma-ray-loud blazars at 15 GHz twice per week with the Owens Valley Radio Observatory (OVRO) 40 m Telescope. Our initial sample included the 1158 sources above declination
Externí odkaz:
http://arxiv.org/abs/1111.0318
Autor:
Richards, Joseph L., Max-Moerbeck, Walter, Pavlidou, Vasiliki, King, Oliver G., Pearson, Timothy J., Readhead, Anthony C. S., Reeves, Rodrigo, Shepherd, Martin C., Stevenson, Matthew A., Weintraub, Lawrence C., Fuhrmann, Lars, Angelakis, Emmanouil, Zensus, J. Anton, Healey, Stephen E., Romani, Roger W., Shaw, Michael S., Grainge, Keith, Birkinshaw, Mark, Lancaster, Katy, Worrall, Diana M., Taylor, Gregory B., Cotter, Garret, Bustos, Ricardo
The Large Area Telescope (LAT) aboard the Fermi Gamma-ray Space Telescope provides an unprecedented opportunity to study gamma-ray blazars. To capitalize on this opportunity, beginning in late 2007, about a year before the start of LAT science operat
Externí odkaz:
http://arxiv.org/abs/1011.3111