Zobrazeno 1 - 10
of 1 144
pro vyhledávání: '"Harrison Fiona"'
Autor:
Earnshaw, Hannah P., Patti, Gauri, Brightman, Murray, Sathyaprakash, Rajath, Walton, Dominic J., Fuerst, Felix, Roberts, Timothy P., Harrison, Fiona A.
We present preliminary results of a Chandra Large Program to monitor the ultraluminous X-ray source (ULX) populations of three nearby, ULX-rich galaxies over the course of a year, finding the ULX population to show a variety of long-term variability
Externí odkaz:
http://arxiv.org/abs/2411.07459
Autor:
Boorman, Peter G., Stern, Daniel, Assef, Roberto J., Borkar, Abhijeet, Brightman, Murray, Buchner, Johannes, Chen, Chien-Ting, Earnshaw, Hannah P., Harrison, Fiona A., Matzeu, Gabriele A., Pfeifle, Ryan W., Ricci, Claudio, Svoboda, Jiří, Torres-Albà, Núria, Zaw, Ingyin
Recent models suggest approximately half of all accreting supermassive black holes (SMBHs; $M_{\rm BH}$ $\gtrsim$ 10$^{5}$ M$_{\odot}$) are expected to undergo intense growth phases behind Compton-thick ($N_{\rm H}$ $>$ 1.5 $\times$ 10$^{24}$ cm$^{-2
Externí odkaz:
http://arxiv.org/abs/2410.07342
Autor:
Boorman, Peter G., Gandhi, Poshak, Buchner, Johannes, Stern, Daniel, Ricci, Claudio, Baloković, Mislav, Asmus, Daniel, Harrison, Fiona A., Svoboda, Jiří, Greenwell, Claire, Koss, Michael, Alexander, David M., Annuar, Adlyka, Bauer, Franz, Brandt, William N., Brightman, Murray, Panessa, Francesca, Chen, Chien-Ting J., Farrah, Duncan, Forster, Karl, Grefenstette, Brian, Hönig, Sebastian F., Hill, Adam B., Kammoun, Elias, Lansbury, George, Lanz, Lauranne, LaMassa, Stephanie, Madsen, Kristin, Marchesi, Stefano, Middleton, Matthew, Mingo, Beatriz, Parker, Michael L., Treister, Ezequiel, Ueda, Yoshihiro, Urry, C. Megan, Zappacosta, Luca
Hard X-ray-selected samples of Active Galactic Nuclei (AGN) provide one of the cleanest views of supermassive black hole accretion, but are biased against objects obscured by Compton-thick gas column densities of $N_{\rm H}$ $>$ 10$^{24}$ cm$^{-2}$.
Externí odkaz:
http://arxiv.org/abs/2410.07339
Autor:
Ruby, Mason, Müller-Sánchez, Francisco, Comerford, Julia M., Stern, Daniel, Cales, Sabrina L., Harrison, Fiona, Malkan, Matthew A., Privon, George C., Treister, Ezequiel
Dual active galactic nuclei (AGN) offer a unique opportunity to probe the relationship between super massive black holes (SMBH) and their host galaxies as well as the role of major mergers in triggering AGN activity. The confirmed dual AGN Mrk 266 ha
Externí odkaz:
http://arxiv.org/abs/2410.05371
Autor:
Adegoke, Oluwashina, Garcia, Javier, Connors, Riley, Ding, Yuanze, Mastroserio, Guglielmo, Steiner, James, Ingram, Adam, Harrison, Fiona, Tomsick, John, Kara, Erin, Mehdipour, Missagh, Fukumura, Keigo, Stern, Daniel, Ubach, Santiago, Lucchini, Matteo
MAXI J1803-298 is a transient black hole candidate discovered in May of 2021 during an outburst that lasted several months. Multiple X-ray observations reveal recurring "dipping" intervals in several of its light curves, particularly during the hard/
Externí odkaz:
http://arxiv.org/abs/2410.01134
Autor:
Gupta, Kriti K., Ricci, Claudio, Temple, Matthew J., Tortosa, Alessia, Koss, Michael J., Assef, Roberto J., Bauer, Franz E., Mushotzy, Richard, Ricci, Federica, Ueda, Yoshihiro, Rojas, Alejandra F., Trakhtenbrot, Benny, Chang, Chin-Shin, Oh, Kyuseok, Li, Ruancun, Kawamuro, Taiki, Diaz, Yaherlyn, Powell, Meredith C., Stern, Daniel, Urry, C. Megan, Harrison, Fiona, Cenko, Brad
We present one of the largest multiwavelength studies of simultaneous optical-to-X-ray spectral energy distributions (SEDs) of unobscured active galactic nuclei (AGN) in the local Universe. Using a representative sample of hard-X-ray-selected AGN fro
Externí odkaz:
http://arxiv.org/abs/2409.12239
Autor:
Ding, Yuanze, García, Javier A., Kallman, Timothy R., Mendoza, Claudio, Bautista, Manuel, Harrison, Fiona A., Tomsick, John A., Dong, Jameson
Luminous accretion disks around black holes are expected to have densities of $\sim 10^{15-22}\,$cm$^{-3}$, which are high enough such that plasma physics effects become important. Many of these effects have been traditionally neglected in the calcul
Externí odkaz:
http://arxiv.org/abs/2409.00253
Autor:
Kiehlmann, Sebastian, De La Parra, Philipe Vergara, Sullivan, Andrew, Synani, A., Liodakis, Ioannis, Readhead, Anthony, Graham, Matthew, Begelman, Mitchell, Blandford, Roger, Chatziioannou, Katerina, Ding, Yuanze, Harrison, Fiona, Homan, D., Hovatta, Talvikki, Kulkarni, Shrinivas, Lister, Matthew, Maiolino, Roberto, Max-Moerbeck, Walter, Molina, B., Mroz, Przemyslaw, O'Dea, Christopher, Pavlidou, Vasiliki, Pearson, Timothy J., Aller, Margo, Lawrence, C., Lazio, T. Joseph, O'Neill, S., Prince, Thomas, Ravi, Vikram, Reeves, Rodrigo, Tassis, Konstantinos, Vallisneri, Michele, Zensus, J.
Haystack and Owens Valley Radio Observatory (OVRO) observations recently revealed strong sinusoidal total flux density variations that maintained coherence between 1975 and 2021 in the blazar PKS 2131-021 ($z=1.283)$. This was interpreted as possible
Externí odkaz:
http://arxiv.org/abs/2407.09647
Autor:
Greenwell, Claire L., Klindt, Lizelke, Lansbury, George B., Rosario, David J., Alexander, David M., Aird, James, Stern, Daniel, Forster, Karl, Koss, Michael J., Bauer, Franz E., Ricci, Claudio, Tomsick, John, Brandt, William N., Connor, Thomas, Boorman, Peter G., Annuar, Adlyka, Ballantyne, David R., Chen, Chien-Ting, Civano, Francesca, Comastri, Andrea, Fawcett, Victoria A., Fornasini, Francesca M., Gandhi, Poshak, Harrison, Fiona, Heida, Marianne, Hickox, Ryan, Kammoun, Elias S., Lanz, Lauranne, Marchesi, Stefano, Noirot, Gaël, Romero-Colmenero, Encarni, Treister, Ezequiel, Urry, C. Megan, Väisänen, Petri, van Soelen, Brian
We present a catalog of hard X-ray serendipitous sources detected in the first 80 months of observations by the Nuclear Spectroscopic Telescope Array (NuSTAR). The NuSTAR serendipitous survey 80-month (NSS80) catalog has an unprecedented $\sim$ 62 Ms
Externí odkaz:
http://arxiv.org/abs/2404.17637
Autor:
Earnshaw, Hannah P, Bachetti, Matteo, Brightman, Murray, Fürst, Felix, Harrison, Fiona A., Middleton, Matthew, Ludlam, Renee, Pike, Sean N., Stern, Daniel, Walton, Dominic J.
We observed the nearby and relatively understudied ultraluminous X-ray source (ULX) NGC 4190 ULX-1 jointly with NICER and NuSTAR to investigate its broadband spectrum, timing properties, and spectral variation over time. We found NGC 4190 ULX-1 to ha
Externí odkaz:
http://arxiv.org/abs/2403.13973