Search Publications
X-ray Observations of the Very-Faint X-ray Transient XMMSL1 J171900.4-353217: A New Candidate Neutron Star Low-Mass X-ray Binary
Degenaar, N.; Wijnands, R.; Armas Padilla, M. +1 more
XMMSL1 J171900.4–353217 is a very-faint X-ray transient that was discovered in 2010 March when it exhibited an outburst. We report on 7 observations, obtained with the X-Ray Telescope (XRT) aboard the Neil Gehrels Swift Observatory between 2010 May and October. By fitting a single absorbed power-law model to the XRT spectra, we infer power-law ind…
X-ray Analysis of Seyfert 1 Galaxies with Optical Polarization: A Test for Unification Models
Guainazzi, M.; Jiménez-Bailón, E.; Longinotti, A. L. +3 more
In accordance with the AGN Unified Model, observed polarization can be related to the orientation of the line of sight with respect to the torus. AGN X-ray emission arises from the central region and carries the imprints of the obscuring material. We aim to test a unified scheme based on optical polarization using X-ray absorption. Using the XMM-N…
Tracing the Assembly Histories of Galaxy Clusters in the Nearby Universe
Andernach, H.; Caretta, C. A.; Coziol, R. +10 more
We have compiled a sample of 67 nearby (z < 0.15) clusters of galaxies, for which on average more than 150 spectroscopic members are available and, by applying different methods to detect substructures in their galaxy distribution, we have studied their assembly history. Our analysis confirms that substructures are present in 70% of our sample,…
The 2017 Release Cloudy
Abel, N. P.; Keenan, F. P.; Ferland, G. J. +8 more
We describe the 2017 release of the spectral synthesis code Cloudy, summarizing the many improvements to the scope and accuracy of the physics which have been made since the previous release. Exporting the atomic data into external data files has enabled many new large datasets to be incorporated into the code. The use of the complete datasets is …
Radio Sources Embedded in the Dense Core B59, the ``Mouthpiece'' of the Pipe Nebula
Loinard, L.; Rodríguez, L. F.; Dzib, S. A. +1 more
We present Very Large Array continuum observations made at 8.3 GHz toward the dense core B59, in the Pipe Nebula. We detect six compact sources, of which five are associated with the five most luminous sources at 70 µm in the region, while the remaining one is probably a background source. We propose that the radio emission is free-free from…