Zobrazeno 1 - 10
of 115
pro vyhledávání: '"Wilkins, Dan"'
Autor:
Moutard, David L., Ludlam, Renee M., Cackett, Edward M., García, Javier A., Miller, Jon M., Wilkins, Dan R.
In this study, we examine 51 archival NICER observations and 6 archival NuSTAR observations of the neutron star (NS) ultra-compact X-ray binary (UCXB) 4U 0614+091, which span over 5 years. The source displays persistent reflection features, so we use
Externí odkaz:
http://arxiv.org/abs/2409.10279
Autor:
Poliszczuk, Artem, Wilkins, Dan, Allen, Steven W., Miller, Eric D., Chattopadhyay, Tanmoy, Schneider, Benjamin, Darve, Julien Eric, Bautz, Marshall, Falcone, Abe, Foster, Richard, Grant, Catherine E., Herrmann, Sven, Kraft, Ralph, Morris, R. Glenn, Nulsen, Paul, Orel, Peter, Schellenberger, Gerrit, Stueber, Haley R.
Traditional cosmic ray filtering algorithms used in X-ray imaging detectors aboard space telescopes perform event reconstruction based on the properties of activated pixels above a certain energy threshold, within 3x3 or 5x5 pixel sliding windows. Th
Externí odkaz:
http://arxiv.org/abs/2407.16768
Autor:
Sarkar, Arnab, Grant, Catherine E., Miller, Eric D., Bautz, Mark, Schneider, Benjamin, Foster, Rick F., Schellenberger, Gerrit, Allen, Steven, Kraft, Ralph P., Wilkins, Dan, Falcone, Abe, Ptak, Andrew
Galactic cosmic ray (GCR) particles have a significant impact on the particle-induced background of X-ray observatories, and their flux exhibits substantial temporal variability, potentially influencing background levels. In this study, we present on
Externí odkaz:
http://arxiv.org/abs/2405.06602
Autor:
Lewin, Collin, Kara, Erin, Cackett, Edward M., Wilkins, Dan, Panagiotou, Christos, Garcia, Javier A., Gelbord, Jonathan
UV and optical continuum reverberation mapping is powerful for probing the accretion disk and inner broad-line region. However, recent reverberation mapping campaigns in the X-ray, UV, and optical have found lags consistently longer than those expect
Externí odkaz:
http://arxiv.org/abs/2307.11145
Autor:
Kara, Erin, Barth, Aaron J., Cackett, Edward M., Gelbord, Jonathan, Montano, John, Li, Yan-Rong, Santana, Lisabeth, Horne, Keith, Alston, William N., Buisson, Douglas, Chelouche, Doron, Du, Pu, Fabian, Andrew C., Fian, Carina, Gallo, Luigi, Goad, Michael R., Grupe, Dirk, Buitrago, Diego H. Gonzalez, Santisteban, Juan V. Hernandez, Kaspi, Shai, Hu, Chen, Komossa, S., Kriss, Gerard A., Lewin, Collin, Lewis, Tiffany, Loewenstein, Michael, Lohfink, Anne, Masterson, Megan, McHardy, Ian M., Mehdipour, Missagh, Miller, Jake, Panagiotou, Christos, Parker, Michael L., Pinto, Ciro, Remillard, Ron, Reynolds, Christopher, Rogantini, Daniele, Wang, Jian-Min, Wang, Jingyi, Wilkins, Dan
We present the first results from a 100-day Swift, NICER and ground-based X-ray/UV/optical reverberation mapping campaign of the Narrow-Line Seyfert 1 Mrk 335, when it was in an unprecedented low X-ray flux state. Despite dramatic suppression of the
Externí odkaz:
http://arxiv.org/abs/2302.07342
Autor:
Rogantini, Daniele, Costantini, Elisa, Gallo, Luigi, Wilkins, Dan, Brandt, Niel, Mehdipour, Missagh
The narrow-line Seyfert 1 galaxy I Zwicky 1 shows a unique and complex system of ionised gas in outflow, which consists of an ultra-fast wind and a two-component warm absorber. In the last two decades, XMM-Newton monitored the source multiple times e
Externí odkaz:
http://arxiv.org/abs/2209.02747
Autor:
Miller, Eric D., Grant, Catherine E., Bautz, Marshall W., Molendi, Silvano, Kraft, Ralph, Nulsen, Paul, Bulbul, Esra, Allen, Steven, Burrows, David N., Eraerds, Tanja, Fioretti, Valentina, Gastaldello, Fabio, Hall, David, Hubbard, Michael W. J., Keelan, Jonathan, Meidinger, Norbert, Perinati, Emanuele, Rau, Arne, Wilkins, Dan
The Wide Field Imager (WFI) flying on Athena will usher in the next era of studying the hot and energetic Universe. WFI observations of faint, diffuse sources will be limited by uncertainty in the background produced by high-energy particles. These p
Externí odkaz:
http://arxiv.org/abs/2202.00064
Autor:
Chattopadhyay, Tanmoy, Herrmann, Sven, Burke, Barry, Donlon, Kevan, Prigozhin, Gregory, Morris, R. Glenn, Orel, Peter, Cooper, Michael, Malonis, Andrew, Wilkins, Dan, Suntharalingam, Vyshnavi, Allen, Steven W., Bautz, Marshall, Leitz, Chris
Publikováno v:
Journal of Astronomical Telescopes, Instruments, and Systems, 8(2), 026006 (26 May 2022)
We present an evaluation of a novel on-chip charge detector, called the Single electron Sensitive Read Out (SiSeRO), for charge-coupled device (CCD) image sensor applications. It uses a p-MOSFET transistor at the output stage with a depleted internal
Externí odkaz:
http://arxiv.org/abs/2112.05033
Autor:
Griffiths, Ryan-Rhys, Jiang, Jiachen, Buisson, Douglas J. K., Wilkins, Dan R., Gallo, Luigi C., Ingram, Adam, Lee, Alpha A., Grupe, Dirk, Kara, Erin, Parker, Michael L., Alston, William, Bourached, Anthony, Cann, George, Young, Andrew, Komossa, S.
The optical and UV variability of the majority of AGN may be related to the reprocessing of rapidly-changing X-ray emission from a more compact region near the central black hole. Such a reprocessing model would be characterised by lags between X-ray
Externí odkaz:
http://arxiv.org/abs/2103.06838
Autor:
Alston, William N., Fabian, Andrew C., Kara, Erin, Parker, Michael L., Dovciak, Michal, Pinto, Ciro, Jiang, Jiachen, Middleton, Matthew J., Miniutti, Giovanni, Walton, Dominic J., Wilkins, Dan R., Buisson, Douglas J. K., Caballero-Garcia, Maria D., Cackett, Edward M., De Marco, Barbara, Gallo, Luigi C., Lohfink, Anne M., Reynolds, Chris S., Uttley, Phil, Young, Andrew J., Zogbhi, Abderahmen
Publikováno v:
NatAs 4, 597 (2020)
X-ray reverberation echoes are assumed to be produced in the strongly distorted spacetime around accreting supermassive black holes. This signal allows us to spatially map the geometry of the inner accretion flow - a region which cannot yet be spatia
Externí odkaz:
http://arxiv.org/abs/2001.06454