Search Publications
Multiwavelength Photometry in the Globular Cluster M2
Dalessandro, E.; Beccari, G.; Ferraro, F. R. +3 more
We present a multiwavelength photometric analysis of the globular cluster M2. The data set has been obtained by combining high-resolution (Hubble Space Telescope/WFPC2 and ACS) and wide-field (Galaxy Evolution Explorer) space observations and ground-based (MEGACAM-CFHT, EMMI-NTT) images. The photometric sample covers the entire cluster extension f…
GRB060602B = Swift J1749.4-2807: an unusual transiently accreting neutron-star X-ray binary
Wijnands, R.; Rol, E.; Starling, R. L. C. +2 more
We present an analysis of the Swift Burst Alert Telescope (BAT) and X-ray telescope (XRT) data of GRB060602B, which is most likely an accreting neutron star in a binary system and not a gamma-ray burst. Our analysis shows that the BAT burst spectrum is consistent with a thermonuclear flash (type I X-ray burst) from the surface of an accreting neut…
Planetary transit candidates in Corot-IRa01 field
Aigrain, S.; Alonso, R.; Barge, P. +35 more
Context: CoRoT is a pioneering space mission devoted to the analysis of stellar variability and the photometric detection of extrasolar planets.
Aims: We present the list of planetary transit candidates detected in the first field observed by CoRoT, IRa01, the initial run toward the Galactic anticenter, which lasted for 60 days.
Methods: W…
Analytic Modeling of the Moreton Wave Kinematics
Temmer, M.; Veronig, A. M.; Vršnak, B. +1 more
The issue whether Moreton waves are flare-ignited or coronal mass ejection (CME)-driven, or a combination of both, is still a matter of debate. We develop an analytical model describing the evolution of a large-amplitude coronal wave emitted by the expansion of a circular source surface in order to mimic the evolution of a Moreton wave. The model …
Suzaku Observations of PSR B1259-63: A New Manifestation of Relativistic Pulsar Wind
Nakazawa, Kazuhiro; Takahashi, Tadayuki; Mori, Koji +2 more
We observed PSR B1259-63, a young nonaccreting pulsar orbiting around a Be star SS 2883, eight times with the Suzaku satellite from 2007 July to September, to characterize the X-ray emission arising from the interaction between a pulsar relativistic wind and Be star outflows. The X-ray spectra showed a featureless continuum in 0.6-10 keV, modeled …
Water vapor abundance near the surface of Venus from Venus Express/VIRTIS observations
Drossart, Pierre; Bézard, Bruno; Marcq, Emmanuel +3 more
Nightside observations of the 1.18-µm atmospheric window by the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) aboard the Venus Express spacecraft were analyzed to measure and map the water vapor abundance in the lower atmosphere. Thermal emission in this window originates partly from the surface and partly from the first scale h…
Hubble Space Telescope survey of the Perseus cluster - II. Photometric scaling relations in different environments
de Rijcke, S.; Held, E. V.; Conselice, C. J. +2 more
We investigate the global photometric scaling relations traced by early-type galaxies in different environments, ranging from dwarf spheroidals, over dwarf elliptical galaxies (dEs), up to giant ellipticals (-8mag >~ MV >~ -24 mag). These results are based, in part, on our new Hubble Space Telescope (HST)/Advanced Camera for Surve…
Observations of the Thermal and Dynamic Evolution of a Solar Microflare
Brosius, Jeffrey W.; Holman, Gordon D.
We observed a solar microflare over a wide temperature range with three instruments aboard the SOHO spacecraft (Coronal Diagnostic Spectrometer (CDS), Extreme-ultraviolet Imaging Telescope (EIT), and Michelson Doppler Imager (MDI)), TRACE (1600 Å), GOES, and RHESSI. The microflare's properties and behavior are those of a miniature flare undergoing…
CHIANTI—An Atomic Database for Emission Lines. X. Spectral Atlas of a Cold Feature Observed with Hinode/EUV Imaging Spectrometer
Young, P. R.; Landi, E.
In this work, we report on a cold, bright portion of an active region observed by the Hinode/EUV Imaging Spectrometer. The emitting plasma was very bright at transition region temperatures, and the intensities of lines of ions formed between 105 and 106 K were enhanced over normal values. The data set constitutes an excellent…
Preferential Acceleration and Perpendicular Heating of Minor Ions in a Collisionless Coronal Hole
Isenberg, Philip A.; Vasquez, Bernard J.
We incorporate the cyclotron-resonant Fermi heating mechanism of Isenberg & Vasquez into an inhomogeneous, collisionless coronal hole model to investigate this kinetic process in the presence of the other known forces on the coronal hole minor ions. The model includes the effects of gravity, charge-separation electric field, and mirroring in t…