Search Publications
Microphysics of Quasi-parallel Shocks in Collisionless Plasmas
Scholer, M.; Burgess, D.
Shocks in collisionless plasmas require dissipation mechanisms which couple fields and particles at scales much less than the conventional collisional mean free path. For quasi-parallel geometries, where the upstream magnetic field makes a small angle to the shock normal direction, wave-particle coupling produces a broad transition zone with large…
X-Ray Observations of High-B Radio Pulsars
McLaughlin, M. A.; Lyne, A. G.; Manchester, R. N. +6 more
The study of high-magnetic-field pulsars is important for examining the relationships between radio pulsars, magnetars, and X-ray-isolated neutron stars (XINSs). Here, we report on X-ray observations of three such high-magnetic-field radio pulsars. We first present the results of a deep XMM-Newton observation of PSR J1734-3333, taken to follow up …
Water production rate of Comet C/2009 P1 (Garradd) throughout the 2011-2012 apparition: Evidence for an icy grain halo
Bertaux, J. -L.; Combi, M. R.; Fougere, N. +3 more
The all-sky hydrogen Lyman-alpha camera, SWAN (Solar Wind Anisotropies), on the SOlar and Heliospheric Observatory (SOHO) satellite made observations of the hydrogen coma of Comet C/2009 P1 (Garradd) throughout its apparition from August 15, 2011 through April 6, 2012. SOHO has been operating in a halo orbit around the Earth-Sun L1 Lagrange point …
New Compton-thick AGN in the circumnuclear H2O maser hosts UGC 3789 and NGC 6264
Kadler, M.; Panessa, F.; Henkel, C. +2 more
Large column densities, derived from X-ray studies, are typically measured towards active galactic nuclei (AGN) hosting water masers, especially when the H2O emission is associated with the nuclear accretion disc. In addition, possible correlations between the intrinsic X-ray luminosity and the characteristics of the H2O mase…
The Detection of C60 in the Well-characterized Planetary Nebula M1-11
Meixner, M.; Otsuka, Masaaki; Yanagisawa, K. +4 more
We performed multiwavelength observations of the young planetary nebula (PN) M1-11 and obtained its elemental abundances, dust mass, and the evolutionary status of the central star. The AKARI/IRC, VLT/VISIR, and Spitzer/IRS spectra show features due to carbon-rich dust, such as the 3.3, 8.6, and 11.3 µm features due to polycyclic aromatic hy…
The orientation dependence of quasar single-epoch black hole mass scaling relationships
Wills, B. J.; Brotherton, M. S.; Runnoe, Jessie C. +2 more
Black hole masses are estimated for radio-loud quasars using several self-consistent scaling relationships based on emission-line widths and continuum luminosities. The emission lines used, Hβ, Mg ii λ2798 and C iv λ1549, have different dependencies on orientation as estimated by radio core dominance. We compare differences in the log of black hol…
Star formation in luminous quasar host galaxies at z = 1-2
Baum, Stefi A.; O'Dea, Christopher P.; Dunlop, James S. +4 more
We present deep Hubble Space Telescope (HST)/Wide-Field Planetary Camera 2 (WFPC2), rest-frame U images of 17 ∼L⋆ quasars at z ≈ 1 and 2 (V and I bands, respectively), designed to explore the host galaxies. We fit the images with simple axisymmetric galaxy models, including a point source, in order to separate nuclear and host-galaxy em…
Discovery of TeV Gamma-Ray Emission from CTA 1 by VERITAS
Nelson, T.; Reyes, L. C.; Aune, T. +88 more
We report the discovery of TeV gamma-ray emission coincident with the shell-type radio supernova remnant (SNR) CTA 1 using the VERITAS gamma-ray observatory. The source, VER J0006+729, was detected as a 6.5 standard deviation excess over background and shows an extended morphology, approximated by a two-dimensional Gaussian of semimajor (semiminor…
The structure of Mars lower atmosphere from Mars Express Radio Science (MaRS) occultation measurements
Tellmann, Silvia; PäTzold, Martin; HäUsler, Bernd +2 more
The Mars Express Radio Science Experiment (MaRS) investigates the lower and middle atmosphere of Mars between the surface and about 40 km with a very high vertical resolution. More than 600 profiles of temperature, pressure, and neutral number density were retrieved between 2004 and 2011 covering four Martian years (MYs 27-30). Radio occultation e…
The local luminosity function of star-forming galaxies derived from the Planck Early Release Compact Source Catalogue
Bonavera, L.; Clements, D. L.; Delabrouille, J. +18 more
The Planck Early Release Compact Source Catalogue (ERCSC) has offered the first opportunity to accurately determine the luminosity function of dusty galaxies in the very local Universe (i.e. distances ≲100 Mpc), at several (sub-)millimetre wavelengths, using blindly selected samples of low-redshift sources, unaffected by cosmological evolution. Th…