Zobrazeno 1 - 10
of 333
pro vyhledávání: '"Torres-Albà N"'
Autor:
Sengupta, D., Torres-Albà, N., Pizzetti, A., López, I. E., Marchesi, S., Vignali, C., Barchiesi, L., Cox, I., Gaspari, M., Zhao, X., Ajello, M., Esposito, F.
Most of the super-massive black holes in the Universe accrete material in an obscured phase. While it is commonly accepted that the "dusty torus" is responsible for the nuclear obscuration, its geometrical, physical, and chemical properties are far f
Externí odkaz:
http://arxiv.org/abs/2410.02878
Autor:
Sheng, Y., Imam, K., Kaur, A., Ajello, M., Domínguez, A., Rau, A., Cenko, S. B., Greiner, J., Hartmann, D. H., Cox, I., Joffre, S., Mcdaniel, A., Silver, R., Torres-Albà, N.
The spectroscopic redshift measurement of BL Lac, a class of blazar, is challenging because its spectrum has no or weak emission lines ($\leqslant5\AA$). We estimate the redshift by the photometric dropout technique for a sample of 64 blazars (59 BL
Externí odkaz:
http://arxiv.org/abs/2409.16236
Autor:
Pizzetti, A., Torres-Alba, N., Marchesi, S., Buchner, J., Cox, I., Zhao, X., Neal, S., Sengupta, D., Silver, R., Ajello, M.
We present the multi-epoch analysis of 13 variable, nearby (z<0.1), Compton-thin (22
Externí odkaz:
http://arxiv.org/abs/2403.06919
Autor:
Peñil, P., Otero-Santos, J., Ajello, M., Buson, S., Domínguez, A., Marcotulli, L., Torres-Albà, N., González, J. Becerra, Acosta-Pulido, J. A.
Blazars present highly variable $\gamma$-ray emission. This variability, which can range from a few minutes to several years, is also observed at other wavelengths across the entire electromagnetic spectrum. We make use of the first 12 years of data
Externí odkaz:
http://arxiv.org/abs/2403.01520
Autor:
Boorman, P. G., Torres-Albà, N., Annuar, A., Marchesi, S., Pfeifle, R., Stern, D., Civano, F., Baloković, M., Buchner, J., Ricci, C., Alexander, D. M., Brandt, W. N., Brightman, M., Chen, C. T., Creech, S., Gandhi, P., García, J. A., Harrison, F., Hickox, R., Kammoun, E., LaMassa, S., Lanzuisi, G., Marcotulli, L., Madsen, K., Matt, G., Matzeu, G., Nardini, E., Piotrowska, J. M., Pizzetti, A., Puccetti, S., Sicilian, D., Silver, R., Walton, D. J., Wilkins, D. R., Zhao, X.
Ever since the discovery of the first Active Galactic Nuclei (AGN), substantial observational and theoretical effort has been invested into understanding how massive black holes have evolved across cosmic time. Circum-nuclear obscuration is now estab
Externí odkaz:
http://arxiv.org/abs/2311.04949
Autor:
Piotrowska, J. M., García, J. A., Walton, D. J., Beckmann, R. S., Stern, D., Ballantyne, D. R., Wilkins, D. R., Bianchi, S., Boorman, P. G., Buchner, J., Chen, C. -T., Coppi, P., Dauser, T., Fabian, A. C., Kammoun, E., Madsen, K., Mallick, L., Matt, G., Matzeu, G., Nardini, E., Pizzetti, A., Puccetti, S., Ricci, C., Tombesi, F., Torres-Albà, N., Wong, K. -W., Collaboration, the HEX-P
Constraining the primary growth channel of supermassive black holes (SMBH) remains one the most actively debated questions in the context of cosmological structure formation. Owing to the expected connection between SMBH spin parameter evolution and
Externí odkaz:
http://arxiv.org/abs/2311.04752
Autor:
Peñil, P., Westernacher-Schneider, J. R., Ajello, M., Domínguez, A., Buson, S., Otero-Santos, J., Marcotulli, L., Torres-Albà, N., Zrake, J.
Blazars display variable emission across the entire electromagnetic spectrum, with timescales that can range from a few minutes to several years. Our recent work has shown that a sample of five blazars exhibit hints of periodicity with a global signi
Externí odkaz:
http://arxiv.org/abs/2310.12754
Publikováno v:
A&A 678, A154 (2023)
We present the analysis of multiepoch observations of a set of 12 variable, Compton-thin, local (z<0.1) active galactic nuclei (AGN) selected from the 100-month BAT catalog. We analyze all available X-ray data from \chandra, \xmm, and \nustar, adding
Externí odkaz:
http://arxiv.org/abs/2301.07138
Autor:
Joffre, S., Silver, R., Rajagopal, M., Ajello, M., Torres-Albà, N., Pizzetti, A., Marchesi, S., Kaur, A.
Publikováno v:
ApJ 940 139 (2022)
The Third Catalog of Hard Fermi Large Area Telescope Sources (3FHL) reports the detection of 1556 objects at E > 10 GeV. However, 177 sources remain unassociated and 23 are associated with a ROSAT X-ray detection of unknown origin. Pointed X-ray obse
Externí odkaz:
http://arxiv.org/abs/2212.02579
Autor:
Sheng, Y., Rajagopal, M., Kaur, A., Ajello, M., Dominguez, A., Rau, A., Cenko, S. B., Greiner, J., Hartmann, D. H., Cox, I., Joffre, S., Karwin, C., Mcdaniel, A., Silver, R., Torres-Alba, N.
BL Lacertae (BL Lac) objects are a subclass of blazar, distinguished by their featureless optical spectrum. The featureless spectrum presents a challenge in measuring the redshift of the BL Lacs. In this paper, we measure the redshift of BL Lacs usin
Externí odkaz:
http://arxiv.org/abs/2209.09877