Zobrazeno 1 - 10
of 3 333
pro vyhledávání: '"Gallo A. C."'
Autor:
Laha, Sibasish, Ricci, Claudio, Mather, John C., Behar, Ehud, Gallo, Luigi C., Marin, Frederic, Mbarek, Rostom, Hankla, Amelia
Active galactic nuclei (AGN) are powerful sources of panchromatic radiation. All AGN emit in X-rays, contributing around $\sim 5-10\%$ of the AGN bolometric luminosity. The X-ray emitting region, popularly known as the corona, is geometrically and ra
Externí odkaz:
http://arxiv.org/abs/2412.11321
Autor:
Mehdipour, Missagh, Brenneman, Laura W., Miller, Jon M., Costantini, Elisa, Behar, Ehud, Gallo, Luigi C., Kaastra, Jelle S., Laha, Sibasish, Nowak, Michael A.
Black hole accretion in active galactic nuclei (AGN) is coupled to the evolution of their host galaxies. Outflowing winds in AGN can play an important role in this evolution through the resulting feedback mechanism. Multi-wavelength spectroscopy is k
Externí odkaz:
http://arxiv.org/abs/2412.03493
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:
Buhariwalla, Margaret Z., Gallo, L. C., Mao, J., Jiang, J., Pothier-Bogoslowski, L. K., Järvelä, E., Komossa, S., Grupe, D.
Previous X-ray works on Mrk 1239 have revealed a complex Narrow Line Seyfert 1 (NLS1) that exhibits substantial absorption and strong emission from both collisional (CIE) and photoionized (PIE) plasmas. Here, we report on deep-pointed observations wi
Externí odkaz:
http://arxiv.org/abs/2405.08785
Autor:
Xu, D. W., Komossa, S., Grupe, D., Wang, J., Xin, L. P., Han, X. H., Wei, J. Y., Bai, J. Y., Bon, E., Cangemi, F., Cordier, B., Dennefeld, M., Gallo, L. C., Kollatschny, W., Kong, De-Feng, Ochmann, M. W., Qiu, Y. L., Schartel, N.
We discuss applications of the study of the new and barely explored class of changing-look (CL) narrow-line Seyfert 1 (NLS1) galaxies and comment on their detection with the space mission SVOM (Space Variable Objects Monitor). We highlight the case o
Externí odkaz:
http://arxiv.org/abs/2401.10600
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
In this work, we examine the application of the wavelet transform to the X-ray timing analyses of active galactic nuclei (AGN) and quasi-periodic eruption sources (QPEs). Several scenarios are simulated to test the effectiveness of the wavelet analys
Externí odkaz:
http://arxiv.org/abs/2306.14972
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