Zobrazeno 1 - 10
of 172
pro vyhledávání: '"Gallo, Luigi C."'
Autor:
Madathil-Pottayil, A., Walton, D. J., García, Javier, Miller, Jon, Gallo, Luigi C., Ricci, C., Reynolds, Mark T., Stern, D., Dauser, T., Jiang, Jiachen, Alston, William, Fabian, A. C., Hardcastle, M. J., Kosec, Peter, Nardini, Emanuele, Reynolds, Christopher S.
'Bare' active galactic nuclei (AGN) are a subclass of Type 1 AGN that show little or no intrinsic absorption. They offer an unobscured view of the central regions of the AGN and therefore serve as ideal targets to study the relativistic reflection fe
Externí odkaz:
http://arxiv.org/abs/2409.01395
Autor:
Draghis, Paul A., Miller, Jon M., Costantini, Elisa, Gallo, Luigi C., Reynolds, Mark, Tomsick, John A., Zoghbi, Abderahmen
Publikováno v:
The Astrophysical Journal, 969:40 (20pp), 2024 July 1
We extend our recent work on black hole spin in X-ray binary systems to include an analysis of 189 archival NuSTAR observations from 24 sources. Using self-consistent data reduction pipelines, spectral models, and statistical techniques, we report an
Externí odkaz:
http://arxiv.org/abs/2311.16225
Autor:
Gonzalez, Adam G., Gallo, Luigi C., Miller, Jon M., Kammoun, Elias S., Ghosh, Akshay, Pottie, Ben A.
We present the first results of a high-cadence Swift monitoring campaign ($3-4$ visits per day for $75$ days) of the Seyfert 1.5 galaxy NGC 6814 characterizing its variability throughout the X-ray and UV/optical wavebands. Structure function analysis
Externí odkaz:
http://arxiv.org/abs/2308.15543
Autor:
Ghosh, Ritesh, Laha, Sibasish, Meyer, Eileen, Roychowdhury, Agniva, Yang, Xiaolong, Pulido, J. A. Acosta, Rakshit, Suvendu, Pandey, Shivangi, Gonzalez, Josefa Becerra, Behar, Ehud, Gallo, Luigi C., Panessa, Francesca, Bianchi, Stefano, La Franca, Fabio, Scepi, Nicolas, Begelman, Mitchell C., Longinotti, Anna Lia, Lusso, Elisabeta, Oates, Samantha, Nicholl, Matt, Cenko, S. Bradley, Connor, Brendan O, Hammerstein, Erica, Jose, Jincen, Gabanyi, Krisztina Eva, Ricci, Federica, Chattopadhyay, Sabyasachi
1ES1927+654 is a nearby active galactic nucleus that has shown an enigmatic outburst in optical/UV followed by X-rays, exhibiting strange variability patterns at timescales of months-years. Here we report the unusual X-ray, UV, and radio variability
Externí odkaz:
http://arxiv.org/abs/2308.03602
Autor:
Yang, Xiaolong, Yao, Su, Gallo, Luigi C., Yang, Jun, Ho, Luis C., Gu, Minfeng, Baan, Willem A., Svoboda, Jiri, Wang, Ran, Liu, Xiang, Hong, Xiaoyu, Wu, Xue-Bing, Zhao, Wei
Accretion of black holes at near-Eddington or super-Eddington rates is the most powerful episode that drives black hole growth, and it may work in several types of objects. However, the physics of accretion and jet-disc coupling in such a state remai
Externí odkaz:
http://arxiv.org/abs/2305.12525
Autor:
Yu, Zhibo, Jiang, Jiachen, Bambi, Cosimo, Gallo, Luigi C., Grupe, Dirk, Fabian, Andrew C., Reynolds, Christopher S., Brandt, William N.
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 522, Issue 4, July 2023, Pages 5456-5468
We report a detailed analysis of the XMM-Newton spectra of six Narrow-Line Seyfert 1 (NLS1) galaxies at redshift z = 0.35--0.92. Compared with the NLS1s at lower redshift in the previously most-studied sample, these NLS1s have larger black hole (BH)
Externí odkaz:
http://arxiv.org/abs/2305.00991
The imminent launch of XRISM will usher in an era of high-resolution X-ray spectroscopy. For active galactic nuclei (AGN) this is an exciting epoch that is full of massive potential for uncovering the ins and outs of supermassive black hole accretion
Externí odkaz:
http://arxiv.org/abs/2302.10930
Autor:
Buhariwalla, Margaret Z., Gallo, Luigi C., Mao, J., Komossa, S., Jiang, J., Gonzalez, A, Grupe, D.
Mrk 1239 is a highly polarized NLS1 in the optical band, whose $0.3-3$ keV spectrum has remained remarkably consistent over more than two decades of observation. Previous analysis of this object suggested that the soft X-ray band was dominated by emi
Externí odkaz:
http://arxiv.org/abs/2301.06559
Autor:
Draghis, Paul A., Miller, Jon M., Zoghbi, Abderahmen, Reynolds, Mark, Costantini, Elisa, Gallo, Luigi C., Tomsick, John A.
The launch of NuSTAR and the increasing number of binary black hole (BBH) mergers detected through gravitational wave (GW) observations have exponentially advanced our understanding of black holes. Despite the simplicity owed to being fully described
Externí odkaz:
http://arxiv.org/abs/2210.02479
We present a spectral analysis of two XMM-Newton observations of the narrow-line Seyfert 1 galaxy UGC 11763. UGC 11763 shows very different soft X-ray spectral shapes in the two observations separated by 12 years. Three spectral models are considered
Externí odkaz:
http://arxiv.org/abs/2208.12177