Zobrazeno 1 - 10
of 47
pro vyhledávání: '"Cheung, Chi C."'
Autor:
Donato, Davide, Cenko, Stephen Bradley, Covino, Stefano, Troja, Eleonora, Pursimo, Tapio, Cheung, Chi C., Fox, Ori D., Kutyrev, Alexander S., Campana, Sergio, Fugazza, Dino, Landt, Hermine, Butler, Nathaniel R.
We report the serendipitous discovery of a bright point source flare in the Abell cluster 1795 with archival EUVE and Chandra observations. Assuming the EUVE emission is associated with the Chandra source, the X-ray 0.5-7 keV flux declined by a facto
Externí odkaz:
http://arxiv.org/abs/1311.6162
Autor:
Hayashida, Masaaki, Stawarz, Lukasz, Cheung, Chi C., Bechtol, Keith, Madejski, Greg M., Ajello, Marco, Massaro, Francesco, Moskalenko, Igor V., Strong, Andrew, Tibaldo, Luigi
We report the discovery of gamma-ray emission from the Circinus galaxy using the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope. Circinus is a nearby (~4 Mpc) starburst with a heavily obscured Seyfert-type active nucleus, bipo
Externí odkaz:
http://arxiv.org/abs/1310.1913
Autor:
Cara, Mihai, Perlman, Eric S., Uchiyama, Yasunobu, Cheung, Chi C., Coppi, Paolo S., Georganopoulos, Markos, Worrall, Diana M., Birkinshaw, Mark, Sparks, William B., Marshall, Herman L., Stawarz, Lukasz, Begelman, Mitchell C., O'Dea, Christopher P., Baum, Stefi A.
Since the discovery of kiloparsec-scale X-ray emission from quasar jets, the physical processes responsible for their high-energy emission have been poorly defined. A number of mechanisms are under active debate, including synchrotron radiation, inve
Externí odkaz:
http://arxiv.org/abs/1305.2535
Autor:
Siemiginowska, Aneta, Stawarz, Łukasz, Cheung, Chi C., Aldcroft, Thomas L., Bechtold, Jill, Burke, D. J., Evans, Daniel, Holt, Joanna, Jamrozy, Marek, Migliori, Giulia
We report results from our deep Chandra X-ray observations of a nearby radio galaxy, 4C+29.30 (z=0.0647). The Chandra image resolves structures on sub-arcsec to arcsec scales, revealing complex X-ray morphology and detecting the main radio features:
Externí odkaz:
http://arxiv.org/abs/1203.1334
X-shaped radio galaxies are defined by their peculiar large-scale radio morphology. In addition to the classical double-lobed structure they have a pair of low-luminosity wings that straddles the nucleus at almost right angles to the active lobes, th
Externí odkaz:
http://arxiv.org/abs/1006.2179
Although rapid reorientation of a black hole spin axis (lasting less than a few Myr) has been suggested as a mechanism for the formation of wings in X-shaped radio galaxies (XRGs), to date no convincing case of reorientation has been found in any XRG
Externí odkaz:
http://arxiv.org/abs/1005.4928
Publikováno v:
Astrophys.J.710:1205-1227,2010
We present new and archival Chandra X-ray Observatory observations of X-shaped radio galaxies within z < 0.1 alongside a comparison sample of normal double-lobed FR I and II radio galaxies. By fitting elliptical distributions to the observed diffuse
Externí odkaz:
http://arxiv.org/abs/0912.3001
Autor:
Georganopoulos, Markos, Sambruna, Rita M., Kazanas, Demosthenes, Cillis, Analia N., Cheung, Chi C., Perlman, Eric S., Blundell, Katherine M., Davis, David S.
We describe a new method for measuring the extragalactic background light (EBL) through the detection of $\gamma$-ray inverse Compton (IC) emission due to scattering of the EBL photons off relativistic electrons in the lobes of radio galaxies. Our me
Externí odkaz:
http://arxiv.org/abs/0808.4086
Publikováno v:
Astrophys.J.693:1261-1274,2009
(Abridged) Data collected by the Pierre Auger Observatory (Auger) provide evidence for anisotropy in the arrival directions of cosmic rays (CRs) with energies >57 EeV that suggests a correlation with the positions of AGN located within ~75 Mpc. A det
Externí odkaz:
http://arxiv.org/abs/0805.1260
Publikováno v:
Astrophys.J.676:87-100,2008
This paper presents XMM-Newton and Chandra X-ray spectroscopy of ten flat-spectrum radio quasars (FSRQ) which are candidates to have an X-ray spectrum dominated by jet synchrotron emission. In all these FSRQ, which are less strongly relativistically
Externí odkaz:
http://arxiv.org/abs/0712.1689