Zobrazeno 1 - 10
of 82
pro vyhledávání: '"Daniel R. Wik"'
Autor:
Ka-Wah Wong, Colin M. Steiner, Allison M. Blum, Dacheng Lin, Rodrigo Nemmen, Jimmy A. Irwin, Daniel R. Wik
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 1, p 82 (2024)
3C 264 is one of the few FRI radio galaxies with detected TeV emission. It is a low-luminosity active galactic nucleus (LLAGN) and is generally associated with a radiatively inefficient accretion flow (RIAF). Earlier multiwavelength studies suggest t
Externí odkaz:
https://doaj.org/article/648f4a842d864636a9ac6e2701f3fa0c
Autor:
Hannah Moon, Daniel R. Wik, V. Antoniou, M. Eracleous, Ann E. Hornschemeier, Margaret Lazzarini, Bret D. Lehmer, Neven Vulic, Benjamin F. Williams, T. J. Maccarone, K. Pottschmidt, Andrew Ptak, Mihoko Yukita, Andreas Zezas
Publikováno v:
The Astrophysical Journal, Vol 970, Iss 2, p 167 (2024)
Using hard ( E > 10 keV) X-ray observations with NuSTAR, we are able to differentiate between the accretion states, and thus compact object types, of neutron stars (NSs) and black holes (BHs) in X-ray binaries (XRBs) in M31, our nearest Milky Way–t
Externí odkaz:
https://doaj.org/article/ec331e507f57451da6b31bc2c721fe6e
Autor:
Samantha Creech, Daniel R. Wik, Steven Rossland, Ayşegül Tümer, Ka-Wah Wong, Stephen A. Walker
Publikováno v:
The Astrophysical Journal, Vol 965, Iss 1, p 33 (2024)
As the brightest galaxy cluster in the X-ray sky, Perseus is an excellent target for studying the intracluster medium (ICM), but until recently, its active galactic nucleus (AGN) made studies of the diffuse emission near its center nearly impossible
Externí odkaz:
https://doaj.org/article/45c91b339a4c4da4a61c83764d925b41
Publikováno v:
The Astrophysical Journal, Vol 962, Iss 1, p 94 (2024)
Observations of galaxy cluster mergers provide insights on the particle acceleration and heating mechanisms taking place within the intracluster medium. Mergers form shocks that propagate through the plasma, which result in shock/cold fronts in the X
Externí odkaz:
https://doaj.org/article/5ae2631a286747fc85f827b36dfe8cf3
Autor:
Cicely Potter, Ayşegül Tümer, Qian H. S. Wang, Daniel R. Wik, Ben J. Maughan, Gerrit Schellenberger
Publikováno v:
The Astrophysical Journal, Vol 958, Iss 2, p 112 (2023)
Galaxy clusters are the most recently formed and most massive, gravitationally bound structures in the Universe. The number of galaxy clusters formed is highly dependent on cosmological parameters, such as the dark matter density, σ _8 , and Ω _m .
Externí odkaz:
https://doaj.org/article/8ec0b54ebb244c6799ef68ae14c59270
Autor:
Randall A. Rojas Bolivar, Daniel R. Wik, Ayşegül Tümer, Fabio Gastaldello, Julie Hlavacek-Larrondo, Paul Nulsen, Valentina Vacca, Grzegorz Madejski, Ming Sun, Craig L. Sarazin, Jeremy Sanders, Damiano Caprioli, Brian Grefenstette, Niels-Jorgen Westergaard
Publikováno v:
The Astrophysical Journal, Vol 954, Iss 1, p 76 (2023)
Observations from past missions such as RXTE and Beppo-SAX suggested the presence of inverse Compton (IC) scattering at hard X-ray energies within the intracluster medium of some massive galaxy clusters. In subsequent years, observations by, e.g., Su
Externí odkaz:
https://doaj.org/article/e87b7b7c99a349b79e50b0d480cb3114
Autor:
Steven Rossland, Daniel R. Wik, Brian Grefenstette, Nico Cappelluti, Francesca Civano, Fabio Gastaldello, Roberto Gilli, Fiona Harrison, Ann Hornschemeier, Ryan Hickox, Roman Krivonos, Kristin Madsen, Silvano Molendi, Andrew Ptak, Daniel Stern, Andreas Zoglauer
Publikováno v:
The Astronomical Journal, Vol 166, Iss 1, p 20 (2023)
By characterizing the contribution of stray light to large data sets from the CXB Measurement X-ray observatory collected over 2012–2017, we report a measurement of the cosmic X-ray background (CXB) in the 3–20 keV energy range. These data repres
Externí odkaz:
https://doaj.org/article/bd1a817fb2e2401ab0bc5eff2153460c
Autor:
Ayşegül Tümer, Daniel R. Wik, Xiaoyuan Zhang, Duy N. Hoang, Massimo Gaspari, Reinout J. van Weeren, Lawrence Rudnick, Chiara Stuardi, François Mernier, Aurora Simionescu, Randall A. Rojas Bolivar, Ralph Kraft, Hiroki Akamatsu, Jelle de Plaa
Publikováno v:
The Astrophysical Journal, Vol 942, Iss 2, p 79 (2023)
Mergers of galaxy clusters are the most energetic events in the universe, driving shock and cold fronts, generating turbulence, and accelerating particles that create radio halos and relics. The galaxy cluster CL 0217+70 is a remarkable late-stage me
Externí odkaz:
https://doaj.org/article/63dc11da1715452e8b057ca011fb4f58
Publikováno v:
Proceedings, Vol 17, Iss 1, p 10 (2019)
TV Cassiopeia (TV Cas) is a well-known eclipsing Algol-type binary comprising a B9V primary and F7 IV secondary in an orbit with a period of 1.81 days, together with a purported low-mass companion in a wide orbit. Despite the considerable attention T
Externí odkaz:
https://doaj.org/article/acb9a061bb9a4e4aa5e9ee47844ea81f
Autor:
Steven Rossland, Daniel R. Wik, Roman Krivonos, Brian W. Grefenstette, K. K. Madsen, K. Perez, Sergey Sazonov, Andreas Zoglauer
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 502:3966-3975
We present measurements of the intensity of the Cosmic X-ray Background (CXB) with the NuSTAR telescope in the 3-20 keV energy range. Our method uses spatial modulation of the CXB signal on the NuSTAR detectors through the telescope's side aperture.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::65b4ac3b4404350b26b6c7eb7f354563
https://doi.org/10.1093/mnras/stab209
https://doi.org/10.1093/mnras/stab209