Zobrazeno 1 - 10
of 157
pro vyhledávání: '"Wik, Daniel. R."'
Autor:
Santra, Ramananda, Kale, Ruta, Giacintucci, Simona, Wik, Daniel. R., Venturi, Tiziana, Dallacasa, Daniele, Cassano, Rossella, Brunetti, Gianfranco, Joshi, Deepak Chandra
We present the first multi-frequency analysis of the candidate ultra-steep spectrum radio halo in the galaxy cluster PLCKESZ G171.94$-$40.65, using the upgraded Giant Metrewave Radio telescope (uGMRT; 400 MHz), and Karl G. Jansky Very Large Array (JV
Externí odkaz:
http://arxiv.org/abs/2409.18075
Autor:
Wong, Ka-Wah, Steiner, Colin M., Blum, Allison M., Lin, Dacheng, Nemmen, Rodrigo, Irwin, Jimmy A., Wik, Daniel R.
3C 264 is one of the few FRI radio galaxies with detected TeV emission. It is a low-luminosity AGN (LLAGN) and is generally associated with a radiatively inefficient accretion flow (RIAF). Earlier multiwavelength studies suggest that the X-ray emissi
Externí odkaz:
http://arxiv.org/abs/2409.05943
Autor:
Moon, Hannah, Wik, Daniel R., Antoniou, V., Eracleous, M., Hornschemeier, Ann E., Lazzarini, Margaret, Lehmer, Bret D., Vulic, Neven, Williams, Benjamin F., Maccarone, T. J., Pottschmidt, K., Ptak, Andrew, Yukita, Mihoko, Zezas, Andreas
Publikováno v:
ApJ 970, 167, 2024
Using hard (E>10 keV) X-ray observations with NuSTAR, we are able to differentiate between accretion states, and thus compact object types, of neutron stars and black holes in X-ray binaries (XRBs) in M31, our nearest Milky Way-type neighbor. Using t
Externí odkaz:
http://arxiv.org/abs/2408.02828
To identify progenitors and investigate evidence of He burning, we searched for decay radiation of freshly synthesized $^{44}$Ti in four young nearby thermonuclear supernova remnants: Kepler, SN 1885, G1.9+0.3 and SN 1006, by analysing the up-to-date
Externí odkaz:
http://arxiv.org/abs/2402.14637
Autor:
Creech, Samantha, Wik, Daniel R., Rossland, Steven, Tümer, Ayşegül, Wong, Ka-Wah, Walker, Stephen A.
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:
http://arxiv.org/abs/2401.16616
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:
http://arxiv.org/abs/2312.06020
Autor:
Potter, Cicely, Tümer, Ayşegül, Wang, Qian H. S., Wik, Daniel R., Maughan, Ben J., Schellenberger, Gerrit
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, $\sigma_8$, and $\O
Externí odkaz:
http://arxiv.org/abs/2309.11743
Autor:
Norseth, Christian T., Wik, Daniel R., ZuHone, John A., Miller, Eric D., Bautz, Marshall W., McDonald, Michael
Publikováno v:
RASTI, 2, 607-619 (2023)
In the outskirts of galaxy clusters, entropy profiles measured from X-ray observations of the hot intracluster medium (ICM) drops off unexpectedly. One possible explanation for this effect is gas clumping, where pockets of cooler and denser structure
Externí odkaz:
http://arxiv.org/abs/2309.01727
Autor:
Roach, Brandon M., Rossland, Steven, Ng, Kenny C. Y., Perez, Kerstin, Beacom, John F., Grefenstette, Brian W., Horiuchi, Shunsaku, Krivonos, Roman, Wik, Daniel R.
Publikováno v:
Phys. Rev. D 107, 023009 (2023)
We present two complementary NuSTAR x-ray searches for keV-scale dark matter decaying to mono-energetic photons in the Milky Way halo. In the first, we utilize the known intensity pattern of unfocused stray light across the detector planes -- the dom
Externí odkaz:
http://arxiv.org/abs/2207.04572
Autor:
Tümer, Ayşegül, Wik, Daniel R., Zhang, Xiaoyuan, Hoang, Duy N., Gaspari, Massimo, van Weeren, Reinout J., Rudnick, Lawrence, Stuardi, Chiara, Mernier, François, Simionescu, Aurora, Bolivar, Randall A. Rojas, Kraft, Ralph, Akamatsu, Hiroki, de Plaa, Jelle
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:
http://arxiv.org/abs/2206.09228