Zobrazeno 1 - 10
of 453
pro vyhledávání: '"Ballantyne, D R"'
Autor:
Palit, B., Rozanska, A., Petrucci, P. O., Gronkiewicz, D., Barnier, S., Bianchi, S., Ballantyne, D. R., Gianolli, V. E., Middei, R., Belmont, R., Ursini, F.
In the X-ray spectra of AGNs, a noticeable excess of soft X-rays is typically detected beyond the extrapolation of the power-law trend observed between 2-10 keV. In the scenario of warm Comptonization, observations propose a warm corona temperature r
Externí odkaz:
http://arxiv.org/abs/2406.14378
Autor:
Vaia, B., Ursini, F., Matt, G., Ballantyne, D. R., Bianchi, S., De Rosa, A., Middei, R., Petrucci, P. O., Piconcelli, E., Tortosa, A.
The enigmatic and intriguing phenomenon of the "soft excess" observed in the X-ray spectra of luminous quasars continues to be a subject of considerable interest and debate in the field of high-energy astrophysics. This study focuses on the quasar HE
Externí odkaz:
http://arxiv.org/abs/2405.13479
Autor:
Ballantyne, D. R., Sudhakar, V., Fairfax, D., Bianchi, S., Czerny, B., De Rosa, A., De Marco, B., Middei, R., Palit, B., Petrucci, P. -O., Rozanska, A., Ursini, F.
The soft excess in active galactic nuclei (AGNs) may arise through a combination of relativistic reflection and the effects of a warm corona at the surface of the accretion disc. Detailed examination of the soft excess can therefore constrain models
Externí odkaz:
http://arxiv.org/abs/2404.03040
Autor:
Pfeifle, Ryan W., Boorman, Peter G., Weaver, Kimberly A., Buchner, Johannes, Civano, Francesca, Madsen, Kristin, Stern, Daniel, Torres-Albà, Núria, Nardini, Emanuele, Ricci, Claudio, Marchesi, Stefano, Ballantyne, D. R., Sicilian, Dominic, Chen, Chien-Ting, Kammoun, Elias, Hickox, Ryan C., García, Javier A., Mallick, Labani
A fundamental goal of modern-day astrophysics is to understand the connection between supermassive black hole (SMBH) growth and galaxy evolution. Merging galaxies offer one of the most dramatic channels for galaxy evolution known, capable of driving
Externí odkaz:
http://arxiv.org/abs/2311.05154
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
External irradiation of a neutron star (NS) accretion disc induces Poynting-Robertson (PR) drag, removing angular momentum and increasing the mass accretion rate. Recent simulations show PR drag significantly enhancing the mass accretion rate during
Externí odkaz:
http://arxiv.org/abs/2309.00146
Autor:
Ballantyne, D. R.
The outpouring of radiation during an X-ray burst can affect the properties of accretion discs around neutron stars: the corona can cool and collapse, the inner regions can be bled away due to enhanced accretion, and the additional heating will lead
Externí odkaz:
http://arxiv.org/abs/2211.03863
Autor:
Xiang, Xin, Ballantyne, D. R., Bianchi, S., De Rosa, A., Matt, G., Middei, R., Petrucci, P. -O., Rozanska, A., Ursini, F.
The X-ray spectra of active galactic nuclei (AGNs) often exhibit an excess of emission above the primary power-law at energies <~ $2$ keV. Two models for the origin of this `soft excess' are ionized relativistic reflection from the inner accretion di
Externí odkaz:
http://arxiv.org/abs/2206.06825
Irradiation of the accretion disc causes reflection signatures in the observed X-ray spectrum, encoding important information about the disc structure and density. A Type I X-ray burst will strongly irradiate the accretion disc and alter its properti
Externí odkaz:
http://arxiv.org/abs/2110.11931
Autor:
Lacy, M., Surace, J. A., Farrah, D., Nyland, K., Afonso, J., Brandt, W. N., Clements, D. L., Lagos, C. D. P., Maraston, C., Pforr, J., Sajina, A., Sako, M., Vaccari, M., Wilson, G., Ballantyne, D. R., Barkhouse, W. A., Brunner, R., Cane, R., Clarke, T. E., Cooper, M., Cooray, A., Covone, G., D'Andrea, C., Evrard, A. E., Ferguson, H. C., Frieman, J., Gonzalez-Perez, V., Gupta, R., Hatziminaoglou, E., Huang, J., Jagannathan, P., Jarvis, M. J., Jones, K. M., Kimball, A., Lidman, C., Lubin, L., Marchetti, L., Martini, P., McMahon, R. G., Mei, S., Messias, H., Murphy, E. J., Newman, J. A., Nichol, R., Norris, R. P., Oliver, S., Perez-Fournon, I., Peters, W. M., Pierre, M., Polisensky, E., Richards, G. T., Ridgway, S. E., Röttgering, H. J. A., Seymour, N., Shirley, R., Somerville, R., Strauss, M. A., Suntzeff, N., Thorman, P. A., van Kampen, E., Verma, A., Wechsler, R., Wood-Vasey, W. M.
The Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) will observe several Deep Drilling Fields (DDFs) to a greater depth and with a more rapid cadence than the main survey. In this paper, we describe the ``DeepDrill'' survey, which us
Externí odkaz:
http://arxiv.org/abs/2011.15030