Search Publications
X-ray study of the double radio relic Abell 3376 with Suzaku
Urdampilleta, I.; Kaastra, J. S.; Mernier, F. +5 more
We present an X-ray spectral analysis of the nearby double radio relic merging cluster Abell 3376 (z = 0.046), observed with the Suzaku XIS instrument. These deep (∼360 ks) observations cover the entire double relic region in the outskirts of the cluster. These diffuse radio structures are amongst the largest and arc-shaped relics observed in comb…
Multiple cyclotron line-forming regions in GX 301-2
Pottschmidt, K.; Natalucci, L.; Kretschmar, P. +6 more
We present two observations of the high-mass X-ray binary GX 301-2 with NuSTAR, taken at different orbital phases and different luminosities. We find that the continuum is well described by typical phenomenological models, like a very strongly absorbed NPEX model. However, for a statistically acceptable description of the hard X-ray spectrum we re…
Supergiant fast X-ray transients versus classical supergiant high mass X-ray binaries: Does the difference lie in the companion wind?
Bozzo, E.; Paul, B.; Pradhan, P.
We present a comparative study of stellar winds in classical supergiant high mass X-ray binaries (SgXBs) and supergiant fast X-ray transients (SFXTs) based on the analysis of publicly available out-of-eclipse observations performed with Suzaku and XMM-Newton. Our data set includes 55 observations of classical SgXBs and 21 observations of SFXTs. We…
X-ray, UV, and optical observations of the accretion disk and boundary layer in the symbiotic star RT Crucis
Nuñez, N. E.; Nelson, T.; Mukai, K. +8 more
Compared to mass transfer in cataclysmic variables, the nature of accretion in symbiotic binaries in which red giants transfer material to white dwarfs (WDs) has been difficult to uncover. The accretion flows in a symbiotic binary are most clearly observable, however, when there is no quasi-steady shell burning on the WD to hide them. RT Cru is th…
Testing a double AGN hypothesis for Mrk 273
Sanders, D. B.; Iwasawa, K.; Evans, A. S. +3 more
The ultra-luminous infrared galaxy (ULIRG) Mrk 273 contains two infrared nuclei, N and SW, separated by 1 arcsecond. A Chandra observation has identified the SW nucleus as an absorbed X-ray source with NH 4 × 1023 cm-2 but also hinted at the possible presence of a Compton-thick AGN in the N nucleus, where a black h…
Discovery of large scale shock fronts correlated with the radio halo and radio relic in the A2163 galaxy cluster
Thölken, Sophia; Reiprich, Thomas H.; Ota, Naomi +1 more
Context. Galaxy clusters form at the intersections of the filamentary large scale structure in merging events and by the accretion of matter along these filaments. Imprints of these formation processes should be visible in the intracluster medium and can arise in shock fronts, which are detectable via discontinuities in, for example, the gas tempe…