Search Publications
South-north asymmetry of field-aligned currents in the magnetotail observed by Cluster
Zhang, T. L.; Dandouras, I.; Lucek, E. +18 more
We statistically investigated features of the field-aligned current (FAC) distribution in plasma sheet boundary layers between 17 and 19 RE in the magnetotail using the curlometer technique to calculate the current from four-point magnetic field measurements taken in 2001. The results show that the FAC distribution in the plasma sheet b…
GAS in Protoplanetary Systems (GASPS). I. First results
Pinte, C.; Ménard, F.; Duchêne, G. +49 more
Context. Circumstellar discs are ubiquitous around young stars, but rapidly dissipate their gas and dust on timescales of a few Myr. The Herschel Space Observatory allows for the study of the warm disc atmosphere, using far-infrared spectroscopy to measure gas content and excitation conditions, and far-IR photometry to constrain the dust distribut…
The central region of M83: massive star formation, kinematics, and the location and origin of the nucleus
Knapen, J. H.; Sharp, R. G.; Ryder, S. D. +3 more
We report new near-IR integral field spectroscopy of the central starburst region of the barred spiral galaxy M83 obtained with Cambridge Infra-Red Panoramic Survey Spectrograph (CIRPASS) on Gemini-South, which we analyse in conjunction with GHαFaS Fabry-Perot data, an Anglo-Australian Telescope (AAT) IRIS2 Ks-band image, and near- and …
The First Detection of [O IV] from an Ultraluminous X-ray Source with Spitzer. II. Evidence for High Luminosity in Holmberg II ULX
Kallman, T. R.; Weaver, K. A.; Berghea, C. T. +1 more
This is the second of two papers examining Spitzer Infrared Spectrograph observations of the ultraluminous X-ray source (ULX) in Holmberg II. Here, we perform detailed photoionization modeling of the infrared lines. Our analysis suggests that the luminosity and morphology of the [O IV] 25.89 µm emission line is consistent with photoionizatio…
Herschel-SPIRE observations of the disturbed galaxy NGC 4438
Elbaz, D.; Bock, J. J.; Clements, D. L. +56 more
We present Herschel-SPIRE observations of the perturbed galaxy NGC 4438 in the Virgo cluster. These images reveal the presence of extra-planar dust up to ~4-5 kpc away from the galaxy's disk. The dust closely follows the distribution of the stripped atomic and molecular hydrogen, supporting the idea that gas and dust are perturbed in a similar fas…
Accurate Coordinates and 2MASS Cross Identifications for (Almost) All Gliese Catalog Star
Kane, Stephen R.; Kirkpatrick, J. Davy; Ciardi, David R. +10 more
We provide precise J2000, epoch 2000 coordinates, and cross-identifications to sources in the 2MASS Point Source Catalog for nearly all stars in the Gliese, Gliese-Jahreiss, and Woolley catalogs of nearby stars. The only Gliese objects where we were not successful are two Gliese sources that are actually QSOs; two proposed companions to brighter s…
A Re-evaluation of the Evolved Stars in the Globular Cluster M13
Bolte, Michael; Sandquist, Eric L.; Gordon, Mark +1 more
We have analyzed photometry from space- and ground-based cameras to identify all bright red giant branch (RGB), horizontal branch (HB), and asymptotic giant branch (AGB) stars within 10' of the center of the globular cluster M13. We identify a modest (7%) population of HB stars redder than the primary peak (including RR Lyrae variables at the blue…
The Advanced Camera for Surveys Nearby Galaxy Survey Treasury. IV. The Star Formation History of NGC 2976
Williams, Benjamin F.; Gilbert, Karoline M.; Dolphin, Andrew +8 more
We present resolved stellar photometry of NGC 2976 obtained with the Advanced Camera for Surveys (ACS) as part of the ACS Nearby Galaxy Survey Treasury (ANGST) program. The data cover the radial extent of the major axis of the disk out to 6 kpc, or ~6 scale lengths. The outer disk was imaged to a depth of M F606W ~ 1, and an inner field…
Direct estimate of cirrus noise in Herschel Hi-GAL images
Miville-Deschênes, M. -A.; Bernard, J. -P.; Martin, P. G. +17 more
In Herschel images of the Galactic plane and many star forming regions, a major factor limiting our ability to extract faint compact sources is cirrus confusion noise, operationally defined as the “statistical error to be expected in photometric measurements due to confusion in a background of fluctuating surface brightness”. The histogram of the …
The calibration of the Cassini-Huygens CAPS Electron Spectrometer
Schippers, P.; André, N.; Lewis, G. R. +15 more
We present the two-stage method used to calibrate the electron spectrometer (ELS), part of the plasma spectrometer (CAPS) on board the Cassini spacecraft currently in orbit around Saturn. The CAPS-ELS is a top-hat electrostatic analyser designed to measure electron fluxes between 0.5 eV and 26 keV. The on-ground calibration method described here i…