Search Publications
NuSTAR Discovery of an Unusually Steady Long-term Spin-up of the Be Binary 2RXP J130159.6-635806
Hailey, Charles J.; Chakrabarty, Deepto; Fürst, Felix +14 more
We present spectral and timing analyses of Nuclear Spectroscopic Telescope Array (NuSTAR) observations of the accreting X-ray pulsar 2RXP J130159.6-635806. The source was serendipitously observed during a campaign focused on the gamma-ray binary PSR B1259-63 and was later targeted for a dedicated observation. The spectrum has a typical shape for a…
Systematic characterization of the Herschel SPIRE Fourier Transform Spectrometer
Valtchanov, I.; Clements, D. L.; Spencer, L. D. +17 more
A systematic programme of calibration observations was carried out to monitor the performance of the Spectral and Photometric Imaging REceiver (SPIRE) Fourier Transform Spectrometer (FTS) instrument on board the Herschel Space Observatory. Observations of planets (including the prime point-source calibrator, Uranus), asteroids, line sources, dark …
Properties and nature of Be stars. 30. Reliable physical properties of a semi-detached B9.5e+G8III binary BR CMi = HD 61273 compared to those of other well studied semi-detached emission-line binaries
Wolf, M.; Frémat, Y.; Royer, F. +13 more
Reliable determination of the basic physical properties of hot emission-line binaries with Roche-lobe filling secondaries is important for developing the theory of mass exchange in binaries. It is a very hard task, however, which is complicated by the presence of circumstellar matter in these systems. So far, only a small number of systems with ac…
Fossil group origins - VI. Global X-ray scaling relations of fossil galaxy clusters
De Grandi, S.; Gastaldello, F.; Jiménez-Bailón, E. +11 more
We present the first pointed X-ray observations of 10 candidate fossil galaxy groups and clusters. With these Suzaku observations, we determine global temperatures and bolometric X-ray luminosities of the intracluster medium (ICM) out to r500 for six systems in our sample. The remaining four systems show signs of significant contaminati…
Carbon, Helium, and Proton Kinetic Temperatures in a Cygnus Loop Shock Wave
Blair, William P.; Raymond, John C.; Ghavamian, Parviz +1 more
Observations of SN 1006 have shown that ions and electrons in the plasma behind fast supernova remnant shock waves are far from equilibrium, with the electron temperature much lower than the proton temperature and ion temperatures approximately proportional to ion mass. In the ∼360 km s-1shock waves of the Cygnus Loop, on the other hand…
Episodes of fluvial and volcanic activity in Mangala Valles, Mars
Daubar, Ingrid J.; McEwen, Alfred S.; Hamilton, Christopher W. +1 more
A new mapping-based study of the 900-km-long Mangala Valles outflow system was motivated by the availability of new high-resolution images and continued debates about the roles of water and lava in outflow channels on Mars. This study uses photogeologic analysis, geomorphic surface mapping, cratering statistics, and relative stratigraphy. Results …
Channel slope reversal near the Martian dichotomy boundary: Testing tectonic hypotheses
Nimmo, Francis; Burr, Devon M.; Jacobsen, Robert E. +1 more
Faults along the Martian dichotomy boundary are evidence of tectonic activity, which by analogy with terrestrial tectonism may cause changes in or even reversal of fluvial longitudinal profiles. In the eastern hemisphere between 30° E and 150° E, this tectonic activity has been hypothesized to result from lower crustal flow or from lithospheric fl…
Cassini VIMS observations of H3+ emission on the nightside of Jupiter
Baines, Kevin H.; Brown, Robert H.; O'Donoghue, James +10 more
We present the first detailed analysis of H3+ nightside emission from Jupiter, using Visual and Infrared Mapping Spectrometer (VIMS) data from the Cassini flyby in 2000-2001, producing the first Jovian maps of nightside H3+ emission, temperature, and column density. Using these, we identify and character…
The SWIFT AGN and Cluster Survey. I. Number Counts of AGNs and Galaxy Clusters
Bregman, Joel N.; Kochanek, Christopher S.; Dai, Xinyu +2 more
The Swift active galactic nucleus (AGN) and Cluster Survey (SACS) uses 125 deg2 of Swift X-ray Telescope serendipitous fields with variable depths surrounding γ-ray bursts to provide a medium depth (4× {{10}-15} erg cm-2 s-1) and area survey filling the gap between deep, narrow Chandra/XMM-Newton surveys…
A Suzaku view of IGR J16393-4643
Maitra, Chandreyee; Paul, Biswajit; Pradhan, Pragati +1 more
The pulsar IGR J16393-4643 belongs to a class of highly absorbed supergiant high-mass X-ray binaries (HMXBs), characterized by a very high column density of absorbing matter. We present the results of simultaneous broad-band pulsation and spectrum analysis from a 44-ks Suzaku observation of the source. The orbital intensity profile created with th…