629 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Goddard Space Flight CenterUS56 papers
- University of PennsylvaniaUS48 papers
- Princeton UniversityUS46 papers
- Pontificia Universidad Católica de ChileCL38 papers
- University of California, BerkeleyUS38 papers
- University of KwaZulu-NatalZA37 papers
- University of PittsburghUS37 papers
- University of TorontoCA37 papers
- Rutgers, The State University of New JerseyUS36 papers
- University of British ColumbiaCA36 papers
- Canadian Institute for Theoretical AstrophysicsCA35 papers
- National Institute of Standards and TechnologyUS35 papers
20 papers · 1 filter
Best approximation in max-plus semimodules
Marianne Akian, Stephane Gaubert, Viorel Nitica +1
We establish new results concerning projectors on max-plus spaces, as well as separating half-spaces, and derive an explicit formula for the distance in Hilbert's projective metric…
Discovery of the first tau Sco analogues: HD 66665 and HD 63425
V. Petit, D. L. Massa, W. L. F. Marcolino +3
The B0.2 V magnetic star tau Sco stands out from the larger population of massive OB stars due to its high X-ray activity, peculiar wind diagnostics and highly complex magnetic fie…
XMM-Newton Observations Reveal Very High X-ray Luminosity from the Carbon-rich Wolf-Rayet Star WR 48a
Svetozar A. Zhekov, Marc Gagne, Stephen L. Skinner
We present XMM-Newton observations of the dusty Wolf-Rayet star WR 48a. This is the first detection of this object in X-rays. The XMM-Newton EPIC spectra are heavily absorbed and t…
Observations of magnetic fields in hot stars
V. Petit
The presence of magnetic fields at the surfaces of many massive stars has been suspected for decades, to explain the observed properties and activity of OB stars. However, very few…
Magnetic fields, winds and X-rays of the massive stars in the Orion Nebula Cluster
V. Petit, G. A. Wade, E. Alecian +3
In some massive stars, magnetic fields are thought to confine the outflowing radiatively-driven wind. Although theoretical models and MHD simulations are able to illustrate the dyn…
Is the Wind of the Galactic Oe Star HD 155806 Magnetically Confined?
A. W. Fullerton, V. Petit, S. Bagnulo +2
Spectropolarimetric observations of HD 155806 - the hottest Galactic Oe star - were obtained with CFHT/ESPaDOnS to test the hypothesis that disk signatures in its spectrum are due…
The Atacama Cosmology Telescope: Cosmology from Galaxy Clusters Detected via the Sunyaev-Zel'dovich Effect
Neelima Sehgal, Hy Trac, Viviana Acquaviva +66
We present constraints on cosmological parameters based on a sample of Sunyaev-Zel'dovich-selected galaxy clusters detected in a millimeter-wave survey by the Atacama Cosmology Tel…
The Atacama Cosmology Telescope: Sunyaev Zel'dovich Selected Galaxy Clusters at 148 GHz in the 2008 Survey
T. A. Marriage, V. Acquaviva, P. A. R. Ade +68
We report on twenty-three clusters detected blindly as Sunyaev-Zel'dovich (SZ) decrements in a 148 GHz, 455 square-degree map of the southern sky made with data from the Atacama Co…
Abrupt longitudinal magnetic field changes in flaring active regions
G. J. D. Petrie, J. J. Sudol
We characterize the changes in the longitudinal photospheric magnetic field during 38 X-class and 39 M-class flares within of disk-center using 1-minute GONG magnetogr…
Searching for Weak or Complex Magnetic Fields in Polarized Spectra of Rigel
M. Shultz, G. A. Wade, C. Neiner +6
Seventy-eight high-resolution Stokes V, Q and U spectra of the B8Iae supergiant Rigel were obtained with the ESPaDOnS spectropolarimeter at CFHT and its clone NARVAL at TBL in the…
Slicing cluster mass functions with a Bayesian razor
Carolyn D. Sealfon
We apply a Bayesian "razor" to forecast Bayes factors between different parameterizations of the galaxy cluster mass function. To demonstrate this approach, we calculate the minimu…
The Atacama Cosmology Telescope: Cosmological Parameters from the 2008 Power Spectra
J. Dunkley, R. Hlozek, J. Sievers +64
We present cosmological parameters derived from the angular power spectrum of the cosmic microwave background (CMB) radiation observed at 148 GHz and 218 GHz over 296 deg^2 with th…
The Atacama Cosmology Telescope: A Measurement of the Cosmic Microwave Background Power Spectrum at 148 and 218 GHz from the 2008 Southern Survey
Sudeep Das, Tobias A. Marriage, Peter A. R. Ade +64
We present measurements of the cosmic microwave background (CMB) power spectrum made by the Atacama Cosmology Telescope at 148 GHz and 218 GHz, as well as the cross-frequency spect…
The Atacama Cosmology Telescope: Calibration with WMAP Using Cross-Correlations
Amir Hajian, Viviana Acquaviva, Peter A. R. Ade +64
We present a new calibration method based on cross-correlations with WMAP and apply it to data from the Atacama Cosmology Telescope (ACT). ACT's observing strategy and map making p…
Modeling broadband X-ray absorption of massive star winds
Maurice A. Leutenegger, David H. Cohen, Janos Zsargó +5
We present a method for computing the net transmission of X-rays emitted by shock-heated plasma distributed throughout a partially optically thick stellar wind from a massive star.…
The Atacama Cosmology Telescope: The Receiver and Instrumentation
D. S. Swetz, P. A. R. Ade, M. Amiri +38
The Atacama Cosmology Telescope was designed to measure small-scale anisotropies in the Cosmic Microwave Background and detect galaxy clusters through the Sunyaev-Zel'dovich effect…
The Atacama Cosmology Telescope: Extragalactic Sources at 148 GHz in the 2008 Survey
T. A. Marriage, J. B. Juin, Y. -T. Lin +66
We report on extragalactic sources detected in a 455 square-degree map of the southern sky made with data at a frequency of 148 GHz from the Atacama Cosmology Telescope 2008 observ…
The Atacama Cosmology Telescope: Physical Properties and Purity of a Galaxy Cluster Sample Selected via the Sunyaev-Zel'dovich Effect
Felipe Menanteau, Jorge Gonzalez, Jean-Baptiste Juin +48
We present optical and X-ray properties for the first confirmed galaxy cluster sample selected by the Sunyaev-Zel'dovich Effect from 148 GHz maps over 455 square degrees of sky mad…
Achromatizing a liquid-crystal spectropolarimeter: Retardance vs Stokes-based calibration of HiVIS
D. M. Harrington, J. R. Kuhn, C. Sennhauser +2
Astronomical spectropolarimeters can be subject to many sources of systematic error which limit the precision and accuracy of the instrument. We present a calibration method for ob…
The Atacama Cosmology Telescope: A Measurement of the 600< ell <8000 Cosmic Microwave Background Power Spectrum at 148 GHz
J. W. Fowler, V. Acquaviva, P. A. R. Ade +69
We present a measurement of the angular power spectrum of the cosmic microwave background (CMB) radiation observed at 148 GHz. The measurement uses maps with 1.4' angular resolutio…