Zobrazeno 1 - 10
of 40
pro vyhledávání: '"R. M. Sambruna"'
Autor:
T. B. Humensky, C. J. Roberts, T. Barclay, R. Caputo, S. B. Cenko, F. Civano, J. Derleth, C. Hedges, M. C. Hui, J. A. Kennea, D. Kocevski, J. Racusin, B. Rani, R. M. Sambruna, J. Slutsky
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 11 (2024)
The Astro2020 Decadal Survey recommended an investment in Time-Domain and Multimessenger Astrophysics (TDAMM) as the top-priority sustaining activity in space for the coming decade. One aspect of NASA’s response to this recommendation is a pilot pr
Externí odkaz:
https://doaj.org/article/d4e12d8393d349fb86295fc616b49f9d
Autor:
M. Gliozzi, FRANCESCA PANESSA, LA FRANCA, Fabio, I. Saviane, L. Monaco, L. Foschini, L. Kedziora Chudczer, S. Satyapal, R. M. Sambruna
Publikováno v:
The Astrophysical Journal. 725:2071-2077
Based on previous spectral and temporal optical studies, Q2122-444 has been classified as a naked active galactic nucleus (AGN) or true type 2 AGN, that is, an AGN that genuinely lacks a broad-line region (BLR). Its optical spectrum seemed to possess
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6e473946c037e76e419598de517f0b38
https://doi.org/10.1088/0004-637x/725/2/2071
https://doi.org/10.1088/0004-637x/725/2/2071
Autor:
M. Georganopoulos, R. M. Sambruna, D. Kazanas, A. N. Cillis, C. C. Cheung, E. S. Perlman, K. M. Blundell, D. S. Davis, Felix A. Aharonian, Werner Hofmann, Frank Rieger
We describe a new, independent method for breaking the deadlock of measuring the cosmologically very important Cosmic Infrared Background. Our method measures the energy density of the Cosmic Infrared Background at the location of radio galaxies by u
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4e4a0e46f402213de72289ad78463a3f
https://doi.org/10.1063/1.3076749
https://doi.org/10.1063/1.3076749
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 414:2739-2750
Here we present the results of a Suzaku observation of the Broad Line Radio Galaxy 3C 445. We confirm the results obtained with the previous X-ray observations which unveiled the presence of several soft X-ray emission lines and an overall X-ray emis
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::69a5dff65b577540f0ae373d64a26989
https://doi.org/10.1111/j.1365-2966.2011.18590.x
https://doi.org/10.1111/j.1365-2966.2011.18590.x
Autor:
Davide Donato, N. Gehrels, R. M. Sambruna, J. Tueller, R. F. Mushotzky, L. Maraschi, W. H. Baumgartner, C. B. Markwardt, Marco Ajello, G. K. Skinner, Scott Barthelmy
Publikováno v:
The Astrophysical Journal. 710:24-28
Using public Fermi Large Area Telescope (LAT) and Swift Burst Alert Telescope observations, we constructed the first sample of blazars selected at both hard X-rays and gamma rays. Studying its spectral properties, we find a luminosity dependence of t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::10a3f4cc0b4e83e28b27bf99c49872e0
https://doi.org/10.1088/0004-637x/710/1/24
https://doi.org/10.1088/0004-637x/710/1/24
Autor:
R. M. Sambruna, Luigi Foschini, Laura Maraschi, Gabriele Ghisellini, Mario Gliozzi, Fabrizio Tavecchio
Publikováno v:
Advances in Space Research. 43:889-894
It has been suggested that some radio-loud narrow-line Seyfert 1 contain relativistic jets, on the basis of their flat-spectrum radio nuclei and studies on variability. We present preliminary results of an ongoing investigation of the X-ray and multi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6a79749816054e8d6b845e00b7929fb1
https://doi.org/10.1016/j.asr.2008.12.021
https://doi.org/10.1016/j.asr.2008.12.021
Autor:
Elena Pian, R. M. Sambruna, Gabriele Ghisellini, G. Di Cocco, V. Bianchin, Mario Gliozzi, Aldo Treves, Luigi Foschini, Fabrizio Tavecchio, Anna Wolter, Gianpiero Tagliaferri
Publikováno v:
Astronomy & Astrophysics. 496:423-428
Aims: We study the blazar nature of the high-redshift Flat-Spectrum Radio Quasar PKS 2149-306 (z = 2.345) by investigating its long-term behavior. Methods: We analyzed all publicly available optical-to-X-ray observations performed by XMM-Newton, Swif
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7a0380d47d0b54ac5b3f1f201f3f3966
https://doi.org/10.1051/0004-6361/200811128
https://doi.org/10.1051/0004-6361/200811128
Publikováno v:
International Journal of Modern Physics D. 17:1467-1474
In almost a decade of operations, Chandra has observed and discovered the X-ray counterparts of several tens of extragalactic radio jets, with a variety of morphologies and SEDs. Here we take a fresh approach and assume that we do not know their rela
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d91ff4260fec12d215759d8b1756635f
https://doi.org/10.1142/s0218271808013042
https://doi.org/10.1142/s0218271808013042
Publikováno v:
The Astrophysical Journal. 678:78-86
We present the first X-ray monitoring observations of the X-ray bright FRI radio galaxy NGC6251 observed with RXTE for 1 year. The primary goal of this study is to shed light on the origin of the X-rays, by investigating the spectral variability with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1daa59c7530ee233c7a3f6672765c59d
https://doi.org/10.1086/529540
https://doi.org/10.1086/529540
Autor:
Tadayuki Takahashi, L. Maraschi, Yasunobu Uchiyama, Paolo De Coppi, R. M. Sambruna, C. M. Urry, J. Van Duyne, C. C. Cheung, Fabrizio Tavecchio
Publikováno v:
The Astrophysical Journal. 661(2):719-727
We present Spitzer IRAC imaging of the large-scale jet in the quasar PKS 1136-135 at wavelengths of 3.6 and 5.8 um, combined with previous VLA, HST, and Chandra observations. We clearly detect infrared emission from the jet, resulting in the most det
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::be151bf70bc0113c2ae800a4e863d55f
http://id.nii.ac.jp/1696/00023632/
http://id.nii.ac.jp/1696/00023632/