Zobrazeno 1 - 10
of 297
pro vyhledávání: '"Walton Dominic J."'
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:
Imbrogno, Matteo, Motta, Sara Elisa, Amato, Roberta, Israel, Gian Luca, Castillo, Guillermo Andres Rodríguez, Brightman, Murray, Casella, Piergiorgio, Bachetti, Matteo, Fürst, Felix, Stella, Luigi, Pinto, Ciro, Pintore, Fabio, Tombesi, Francesco, Gúrpide, Andrés, Middleton, Matthew J., Salvaggio, Chiara, Tiengo, Andrea, Belfiore, Andrea, De Luca, Andrea, Esposito, Paolo, Wolter, Anna, Earnshaw, Hannah P., Walton, Dominic J., Roberts, Timothy P., Zampieri, Luca, Marelli, Martino, Salvaterra, Ruben
The discovery of pulsations in (at least) six ultraluminous X-ray sources (ULXs) has shown that neutron stars can accrete at (highly) super-Eddington rates, challenging the standard accretion theories. M51 ULX-7, with a spin signal of $P\simeq2.8$ s,
Externí odkaz:
http://arxiv.org/abs/2407.09240
Autor:
Belfiore, Andrea, Salvaterra, Ruben, Sidoli, Lara, Israel, Gian Luca, Stella, Luigi, De Luca, Andrea, Mereghetti, Sandro, Esposito, Paolo, Pintore, Fabio, D'Aì, Antonino, Castillo, Guillermo Rodrìguez, Walton, Dominic J., Fürst, Felix, Magistrali, Danilo, Wolter, Anna, Imbrogno, Matteo
Publikováno v:
ApJ 965, 78B (2024)
We report on the orbit of the binary system powering the most extreme ultraluminous X-ray pulsar known to date: NGC 5907 ULX-1 (hereafter ULX1). ULX1 has been the target of a substantial multi-instrument campaign, mainly in the X-ray band, but no cle
Externí odkaz:
http://arxiv.org/abs/2405.04574
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
Autor:
Dobie, Dougal, Sluse, Dominique, Deller, Adam, Murphy, Tara, Krone-Martins, Alberto, Stern, Daniel, Wang, Ziteng, Wang, Yuanming, hm, Céline Bøe, Djorgovski, S. G., Galluccio, Laurent, Delchambre, Ludovic, Connor, Thomas, Brok, Jakob Sebastiaan den, Cunha, Pedro H. Do Vale, Ducourant, Christine, Graham, Matthew J., Jalan, Priyanka, Klioner, Sergei A., Klüter, Jonas, Mignard, François, Negi, Vibhore, Petit, Quentin, Scarano Jr, Sergio, Slezak, Eric, Surdej, Jean, Teixeira, Ramachrisna, Walton, Dominic J., Wamsbsganss, Joachim
We present radio observations of 24 confirmed and candidate strongly lensed quasars identified by the Gaia Gravitational Lenses (GraL) working group. We detect radio emission from 8 systems in 5.5 and 9 GHz observations with the Australia Telescope C
Externí odkaz:
http://arxiv.org/abs/2311.07836
Autor:
Bachetti, Matteo, Middleton, Matthew J., Pinto, Ciro, Gúrpide, Andrés, Walton, Dominic J., Brightman, Murray, Lehmer, Bret, Roberts, Timothy P., Vasilopoulos, Georgios, Alford, Jason, Amato, Roberta, Ambrosi, Elena, Dai, Lixin, Earnshaw, Hannah P., Byad, Hamza El, García, Javier A., Israel, Gian Luca, Jaodand, Amruta, Madsen, Kristin, Maitra, Chandreyee, Mandel, Shifra, Mori, Kaya, Pintore, Fabio, Ohsuga, Ken, Pilia, Maura, Stern, Daniel, Younes, George, Wolter, Anna
Ultraluminous X-ray sources (ULXs) represent an extreme class of accreting compact objects: from the identification of some of the accretors as neutron stars to the detection of powerful winds travelling at 0.1-0.2 c, the increasing evidence points t
Externí odkaz:
http://arxiv.org/abs/2311.04733
Autor:
Brightman, Murray, Hameury, Jean-Marie, Lasota, Jean-Pierre, Baldi, Ranieri D., Bruni, Gabriele, Cann, Jenna M., Earnshaw, Hannah, Fürst, Felix, Heida, Marianne, Jaodand, Amruta, Lazzarini, Margaret, Middleton, Matthew J., Walton, Dominic J., Weaver, Kimberly A.
Ultraluminous X-ray sources (ULXs) are our best laboratories for studying extreme super-Eddington accretion. Most studies of these objects are of relatively persistent sources, however there is growing evidence to suggest a large fraction of these so
Externí odkaz:
http://arxiv.org/abs/2305.01693
Autor:
Saade, M. Lynne, Brightman, Murray, Stern, Daniel, Connor, Thomas, Djorgovski, S. G., D'Orazio, Daniel J., Ford, K. E. S., Graham, Matthew J., Haiman, Zoltan, Jun, Hyunsung D., Kammoun, Elias, Kraft, Ralph P., McKernan, Barry, Vikhlinin, Alexei, Walton, Dominic J.
We present analysis of NuSTAR X-ray observations of three AGN that were identified as candidate subparsec binary supermassive black hole (SMBH) systems in the Catalina Real-Time Transient Survey based on apparent periodicity in their optical light cu
Externí odkaz:
http://arxiv.org/abs/2304.06144
Autor:
Liu, Honghui, Jiang, Jiachen, Zhang, Zuobin, Bambi, Cosimo, Fabian, Andrew C., Garcia, Javier A., Ingram, Adam, Kara, Erin, Steiner, James F., Tomsick, John A., Walton, Dominic J., Young, Andrew J.
Publikováno v:
ApJ, 951, 145 (2023)
We present a high-density relativistic reflection analysis of 21 spectra of six black hole X-ray binaries in the hard state with data from \textit{NuSTAR} and \textit{Swift}. We find that 76\% of the observations in our sample require a disk density
Externí odkaz:
http://arxiv.org/abs/2303.10593
Autor:
Masterson, Megan, Kara, Erin, Pasham, Dheeraj R., D'Orazio, Daniel J., Walton, Dominic J., Fabian, Andrew C., Lucchini, Matteo, Remillard, Ronald A., Arzoumanian, Zaven, Burkhonov, Otabek, Choi, Hyeonho, Ehgamberdiev, Shuhrat A., Ferrara, Elizabeth C., Guolo, Muryel, Im, Myungshin, Kim, Yonggi, Mirzaqulov, Davron, Paek, Gregory S. H., Sung, Hyun-il, Yoon, Joh-Na
The nuclear transient AT2019cuk/Tick Tock/SDSS J1430+2303 has been suggested to harbor a supermassive black hole (SMBH) binary near coalescence. We report results from high-cadence NICER X-ray monitoring with multiple visits per day from January-Augu
Externí odkaz:
http://arxiv.org/abs/2302.12847