305 citations · 789 across the 20 of their papers we have counts for
20 papers
X-ray emission from magnetized neutron star atmospheres at low mass accretion rates. I. Phase-averaged spectrum
E. Sokolova-Lapa, M. Gornostaev, J. Wilms +12
Recent observations of X-ray pulsars at low luminosities allow, for the first time, to compare theoretical models for the emission from highly magnetized neutron star atmospheres a…
The jet collimation profile at high resolution in BL Lacertae
C. Casadio, N. R. MacDonald, B. Boccardi +14
Controversial studies on the jet collimation profile of BL Lacertae (BL Lac), the eponymous blazar of BL Lac objects class, complicate the scenario in this already puzzling class o…
Observations of the Ultra-compact X-ray Binary 4U 1543-624 in Outburst with NICER, INTEGRAL, Swift, and ATCA
R. M. Ludlam, L. Shishkovsky, P. M. Bult +17
We report on X-ray and radio observations of the ultra-compact X-ray binary 4U 1543-624 taken in August 2017 during an enhanced accretion episode. We obtained NICER monitoring of t…
First Results on the Search for Chameleons with the KWISP Detector at CAST
S. Arguedas Cuendis, J. Baier, K. Barth +50
We report on a first measurement with a sensitive opto-mechanical force sensor designed for the direct detection of coupling of real chameleons to matter. These dark energy candida…
Breaking the limit: Super-Eddington accretion onto black holes and neutron stars
M. Brightman, M. Bachetti, H. P. Earnshaw +10
With the recent discoveries of massive and highly luminous quasars at high redshifts (; e.g. Mortlock et al. 2011), the question of how black holes (BHs) grow in the early…
Micromegas for dark matter searches: CAST/IAXO & TREX-DM
J. G. Garza, S. Aune, J. F. Castel +14
The most compelling candidates for Dark Matter to day are WIMPs and axions. The applicability of gasesous Time Projection Chambers (TPCs) with Micromesh Gas Structures (Micromegas)…
Low Background Micromegas in CAST
J. G. Garza, S. Aune, D. Calvet +22
Solar axions could be converted into x-rays inside the strong magnetic field of an axion helioscope, triggering the detection of this elusive particle. Low background x-ray detecto…
Search for chameleons with CAST
V. Anastassopoulos, M. Arik, S. Aune +61
In this work we present a search for (solar) chameleons with the CERN Axion Solar Telescope (CAST). This novel experimental technique, in the field of dark energy research, exploit…
New solar axion search in CAST with He filling
M. Arik, S. Aune, K. Barth +60
The CERN Axion Solar Telescope (CAST) searches for conversion in the 9 T magnetic field of a refurbished LHC test magnet that can be directed toward the Sun. Two parallel m…
Lowering the background level and the energy threshold of Micromegas x-ray detectors for axion searches
F. J. Iguaz, S. Aune, F. Aznar +14
Axion helioscopes search for solar axions by their conversion in x-rays in the presence of high magnetic fields. The use of low background x-ray detectors is an essential component…
Conceptual Design of the International Axion Observatory (IAXO)
E. Armengaud, F. T. Avignone, M. Betz +85
The International Axion Observatory (IAXO) will be a forth generation axion helioscope. As its primary physics goal, IAXO will look for axions or axion-like particles (ALPs) origin…
X-ray detection with Micromegas with background levels below 10 keVcms
S. Aune, F. Aznar, D. Calvet +26
Micromegas detectors are an optimum technological choice for the detection of low energy x-rays. The low background techniques applied to these detectors yielded remarkable backgro…
Results and perspectives of the solar axion search with the CAST experiment
E. Ferrer-Ribas, M. Arik, S. Aune +69
The status of the solar axion search with the CERN Axion Solar Telescope (CAST) will be presented. Recent results obtained by the use of He as a buffer gas has allowed us to ex…
CAST microbulk micromegas in the Canfranc Underground Laboratory
A. Tomás, S. Aune, T. Dafni +19
During the last taking data campaigns of the CAST experiment, the micromegas detectors have achieved background levels of keVcms betw…
The discrimination capabilities of Micromegas detectors at low energy
F. J. Iguaz, T. Dafni, E. Ferrer-Ribas +11
The latest generation of Micromegas detectors show a good energy resolution, spatial resolution and low threshold, which make them idoneous in low energy applications. Two micromeg…
Status of R&D on Micromegas for Rare Event Searches: The T-REX project
I. G. Irastorza, J. Castel, S. Cebrián +24
The T-REX project aims at developing novel readout techniques for Time Projection Chambers in experiments searching for rare events. The enhanced performance of the latest Micromeg…
CAST search for sub-eV mass solar axions with 3He buffer gas
M. Arik, S. Aune, K. Barth +68
The CERN Axion Solar Telescope (CAST) has extended its search for solar axions by using 3He as a buffer gas. At T=1.8 K this allows for larger pressure settings and hence sensitivi…
Modeling the oxygen K absorption in the interstellar medium: an {\it XMM}-Newton view of Sco X-1
J. García, J. M. Ramírez, T. R. Kallman +5
We investigate the absorption structure of the oxygen in the interstellar medium by analyzing {\it XMM}-Newton observations of the low mass X-ray binary Sco X-1. We use simple mode…
K-shell photoionization of Na-like to Cl-like ions of Mg, Si, S, Ar, and Ca
M. C. Witthoeft, J. García, T. R. Kallman +4
We present -matrix calculations of photoabsorption and photoionization cross sections across the K-edge of Mg, Si, S, Ar, and Ca ions with more than 10 electrons. The calculatio…
A Catalogue of Be Stars in the Direction of the Galactic Bulge
B. E. Sabogal, R. E. Mennickent, G. Pietrzyński +4
Detailed studies of Be stars in environments with different metallicities like the Magellanic Clouds or the Galactic bulge are necessary to understand the formation and evolution m…