Zobrazeno 1 - 10
of 163
pro vyhledávání: '"D J, Walton"'
Autor:
P. G. Boorman, N. Torres-Albà, A. Annuar, S. Marchesi, R. W. Pfeifle, D. Stern, F. Civano, M. Baloković, J. Buchner, C. Ricci, D. M. Alexander, W. N. Brandt, M. Brightman, C. T. Chen, S. Creech, P. Gandhi, J. A. García, F. Harrison, R. Hickox, E. Kammoun, S. LaMassa, G. Lanzuisi, L. Marcotulli, K. Madsen, G. Matt, G. Matzeu, E. Nardini, J. M. Piotrowska, A. Pizzetti, S. Puccetti, D. Sicilian, R. Silver, D. J. Walton, D. R. Wilkins, X. Zhao, The HEX-P Collaboration
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 11 (2024)
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:
https://doaj.org/article/06e8a41e09e4449b99d01c68c15ce62e
Autor:
J. M. Piotrowska, J. A. García, D. J. Walton, R. S. Beckmann, D. Stern, D. R. Ballantyne, D. R. Wilkins, S. Bianchi, P. G. Boorman, J. Buchner, C.-T. Chen, P. Coppi, T. Dauser, A. C. Fabian, E. Kammoun, K. Madsen, L. Mallick, G. Matt, G. Matzeu, E. Nardini, A. Pizzetti, S. Puccetti, C. Ricci, F. Tombesi, N. Torres-Albà, K.-W. Wong
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 11 (2024)
Constraining the primary growth channel of supermassive black holes (SMBHs) 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:
https://doaj.org/article/c254067cf45646e59c1e4ed6cdd384c6
Autor:
J. A. J. Alford, G. A. Younes, Z. Wadiasingh, M. Abdelmaguid, H. An, M. Bachetti, M. G. Baring, A. Beloborodov, A. Y. Chen, T. Enoto, J. A. García, J. D. Gelfand, E. V. Gotthelf, A. K. Harding, C-P. Hu, A. D. Jaodand, V. Kaspi, C. Kim, C. Kouveliotou, L. Kuiper, K. Mori, M. Nynka, J. Park, D. Stern, J. Valverde, D. J. Walton
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 10 (2024)
The hard X-ray emission from magnetars and other isolated neutron stars remains under-explored. An instrument with higher sensitivity to hard X-rays is critical to understanding the physics of neutron star magnetospheres and also the relationship bet
Externí odkaz:
https://doaj.org/article/0d5033e0213f452d803560def776d0fe
Autor:
R. M. Ludlam, C. Malacaria, E. Sokolova-Lapa, F. Fuerst, P. Pradhan, A. W. Shaw, K. Pottschmidt, S. Pike, G. Vasilopoulos, J. Wilms, J. A. García, K. Madsen, D. Stern, C. Maitra, M. Del Santo, D. J. Walton, M. C. Brumback, J. van den Eijnden
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 10 (2023)
Accreting neutron stars (NSs) represent a unique laboratory for probing the physics of accretion in the presence of strong magnetic fields (B ≳ 108 G). Additionally, the matter inside the NS itself exists in an ultra-dense, cold state that cannot b
Externí odkaz:
https://doaj.org/article/40471cbe8bd040df8c4284253ba4023e
Autor:
P. Kosec, D. Rogantini, E. Kara, C. R. Canizares, A. C. Fabian, C. Pinto, I. Psaradaki, R. Staubert, D. J. Walton
Publikováno v:
The Astrophysical Journal, Vol 972, Iss 1, p 32 (2024)
X-ray binaries are known to launch powerful accretion disk winds that can have a significant impact on the binary systems and their surroundings. To quantify the impact and determine the launching mechanisms of these outflows, we need to measure the
Externí odkaz:
https://doaj.org/article/17a1c526fe434bedaaa8fc7402f5dbf7
Autor:
M. Prasow-Émond, J. Hlavacek-Larrondo, K. Fogarty, É. Artigau, D. Mawet, P. Gandhi, J. F. Steiner, J. Rameau, D. Lafrenière, A. Fabian, D. J. Walton, R. Doyon, B. B. Ren
Publikováno v:
The Astrophysical Journal, Vol 967, Iss 1, p 8 (2024)
Although the study of X-ray binaries has led to major breakthroughs in high-energy astrophysics, their circumbinary environment at scales of ∼100–10,000 au has not been thoroughly investigated. In this paper, we undertake a novel and exploratory
Externí odkaz:
https://doaj.org/article/386851767929481cb2312cdff1e265ea
Autor:
P. Kosec, E. Kara, A. C. Fabian, C. Pinto, I. Psaradaki, D. Rogantini, R. Staubert, D. J. Walton
Publikováno v:
The Astrophysical Journal, Vol 959, Iss 1, p 51 (2023)
Hercules X-1 is a nearly edge-on X-ray binary with a warped, precessing accretion disk, which manifests through a 35-day cycle of alternating High and Low flux states. This disk precession introduces a changing line of sight toward the X-ray source,
Externí odkaz:
https://doaj.org/article/9edefa409e474408afb665b73c45c750
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 516:5997-6008
We present new broadband X-ray observations of the $z \sim 2.5$ lensed quasar 2MASS J1042+1641, combining $XMM$-$Newton$, $Chandra$ and $NuSTAR$ to provide coverage of the X-ray spectrum over the 0.3$-$40 keV bandpass in the observed frame, correspon
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::58091bd17fa450e553b32a42b50c1197
https://doi.org/10.1093/mnras/stac2554
https://doi.org/10.1093/mnras/stac2554
Autor:
P. Kosec, E. Kara, A. C. Fabian, F. Fürst, C. Pinto, I. Psaradaki, C. S. Reynolds, D. Rogantini, D. J. Walton, R. Ballhausen, C. Canizares, S. Dyda, R. Staubert, J. Wilms
The accretion of matter onto black holes and neutron stars often leads to the launching of outflows that can greatly affect the environments surrounding the compact object. In supermassive black holes, these outflows can even be powerful enough to di
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::16f3b69ee50746aa3858cea2d5fa5a10
http://arxiv.org/abs/2304.05490
http://arxiv.org/abs/2304.05490
Publikováno v:
Astronomische Nachrichten, 2023 [Peer Reviewed Journal]
We have recently published a catalog of 1843 candidate ultraluminous X‐ray sources (ULXs). This is the largest catalog of ULXs to date and was built by cross‐correlating recent serendipitous source catalogs from the XMM‐Newton, Swift, and Chand
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::861f2ce12965370101414c54d124951b