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8 papers · 2 filters
Source identification in the IGR J17448-3232 field: discovery of the Scorpius galaxy cluster
Nicolas M. Barrière, John A. Tomsick, Daniel R. Wik +2
We use a 43-ks XMM-Newton observation to investigate the nature of sources first distinguished by a follow-up Chandra observation of the field surrounding INTEGRAL source IGR J1744…
Spatially Resolving a Starburst Galaxy at Hard X-ray Energies: NuSTAR, Chandra, AND VLBA Observations of NGC 253
Daniel R. Wik, Bret D. Lehmer, Ann E. Hornschemeier +16
Prior to the launch of NuSTAR, it was not feasible to spatially resolve the hard (E > 10 keV) emission from galaxies beyond the Local Group. The combined NuSTAR dataset, comprised…
A NuSTAR observation of the center of the Coma Cluster
F. Gastaldello, D. R. Wik, S. Molendi +13
We present the results of a 55ks NuSTAR observation of the core of the Coma Cluster. The global spectrum can be explained by thermal gas emission, with a conservative 90% upper lim…
NuSTAR study of Hard X-Ray Morphology and Spectroscopy of PWN G21.5-0.9
Melania Nynka, Charles J. Hailey, Stephen P. Reynolds +16
We present NuSTAR high energy X-ray observations of the pulsar wind nebula (PWN)/supernova remnant G21.5-0.9. We detect integrated emission from the nebula up to ~40 keV, and resol…
Asymmetries in core-collapse supernovae from maps of radioactive Ti in CassiopeiaA
B. W. Grefenstette, F. A. Harrison, S. E. Boggs +28
Asymmetry is required by most numerical simulations of stellar core-collapse explosions, but the form it takes differs significantly among models. The spatial distribution of radio…
NuSTAR Observations of the Bullet Cluster: Constraints on Inverse Compton Emission
Daniel R. Wik, Allan Hornstrup, Silvano Molendi +16
The search for diffuse non-thermal inverse Compton (IC) emission from galaxy clusters at hard X-ray energies has been undertaken with many instruments, with most detections being e…