Search Publications
Oscillating red giants in the CoRoT exofield: asteroseismic mass and radius determination
Deleuil, M.; Goupil, M. -J.; Baudin, F. +10 more
Context. Observations and analysis of solar-type oscillations in red-giant stars is an emerging aspect of asteroseismic analysis with a number of open questions yet to be explored. Although stochastic oscillations have previously been detected in red giants from both radial velocity and photometric measurements, those data were either too short or…
Discovery of Ultra-fast Outflows in a Sample of Broad-line Radio Galaxies Observed with Suzaku
Cappi, M.; Ballo, L.; Tombesi, F. +5 more
We present the results of a uniform and systematic search for blueshifted Fe K absorption lines in the X-ray spectra of five bright broad-line radio galaxies observed with Suzaku. We detect, for the first time in radio-loud active galactic nuclei (AGNs) at X-rays, several absorption lines at energies greater than 7 keV in three out of five sources…
A Massive Molecular Gas Reservoir in the z = 5.3 Submillimeter Galaxy AzTEC-3
Schinnerer, Eva; Neri, Roberto; Scoville, Nicholas Z. +6 more
We report the detection of CO J = 2→1, 5→4, and 6→5 emission in the highest-redshift submillimeter galaxy (SMG) AzTEC-3 at z = 5.298, using the Expanded Very Large Array and the Plateau de Bure Interferometer. These observations ultimately confirm the redshift, making AzTEC-3 the most submillimeter-luminous galaxy in a massive z ~= 5.3 protocluste…
Cosmological constraints from strong gravitational lensing in clusters of galaxies.
Kneib, J. -P.; Jullo, E.; Richard, J. +4 more
Current efforts in observational cosmology are focused on characterizing the mass-energy content of the Universe. We present results from a geometric test based on strong lensing in galaxy clusters. Based on Hubble Space Telescope images and extensive ground-based spectroscopic follow-up of the massive galaxy cluster Abell 1689, we used a parametr…
Efficient Cosmic Ray Acceleration, Hydrodynamics, and Self-Consistent Thermal X-Ray Emission Applied to Supernova Remnant RX J1713.7-3946
Raymond, John; Slane, Patrick; Ellison, Donald C. +1 more
We model the broadband emission from supernova remnant (SNR) RX J1713.7-3946 including, for the first time, a consistent calculation of thermal X-ray emission together with non-thermal emission in a nonlinear diffusive shock acceleration model. Our model tracks the evolution of the SNR including the plasma ionization state between the forward shoc…
Star formation in AGN hosts in GOODS-N
Berta, S.; Magnelli, B.; Nordon, R. +40 more
Sensitive Herschel far-infrared observations can break degeneracies that were inherent to previous studies of star formation in high-z AGN hosts. Combining PACS 100 and 160 µm observations of the GOODS-N field with 2 Ms Chandra data, we detect 20% of X-ray AGN individually at >3σ. The host far-infrared luminosity of AGN with L2-10 ke…
Mid- and far-infrared luminosity functions and galaxy evolution from multiwavelength Spitzer observations up to z ~ 2.5
Bondi, M.; Cimatti, A.; Rodighiero, G. +25 more
Context. Studies of the infrared (IR) emission of cosmic sources have proven essential to constraining the evolutionary history of cosmic star formation and the gravitational accretion of nuclear black holes, because many of these events occur inside heavily dust-extinguished environments.
Aims: The Spitzer Space Telescope has provided a larg…
Imaging the Molecular Gas in a Submillimeter Galaxy at z = 4.05: Cold Mode Accretion or a Major Merger?
Daddi, E.; Elbaz, D.; Stern, D. +11 more
We present a high-resolution (down to 0farcs18), multi-transition imaging study of the molecular gas in the z = 4.05 submillimeter galaxy GN20. GN20 is one of the most luminous starburst galaxy known at z>4, and is a member of a rich proto-cluster of galaxies at z = 4.05 in GOODS-North. We have observed the CO 1-0 and 2-1 emission with the Very…
A study of solar energetic particle events of 1997-2006: Their composition and associations
Cane, H. V.; Richardson, I. G.; von Rosenvinge, T. T.
We examined the properties and associations of 280 solar proton events that extended above 25 MeV and occurred in the years 1997-2006. The properties include early peak intensities of five species over several energy ranges and the intensity-time profiles. Solar event associations were made for as many events as possible. The solar parameters dete…
A Short Gamma-ray Burst "No-host" Problem? Investigating Large Progenitor Offsets for Short GRBs with Optical Afterglows
Berger, E.
We investigate the afterglow properties and large-scale environments of several short-duration gamma-ray bursts (GRBs) with subarcsecond optical afterglow positions but no bright coincident host galaxies. The purpose of this joint study is to robustly assess the possibility of significant offsets, a hallmark of the compact object binary merger mod…