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Topography of valley networks on Mars from Mars Express High Resolution Stereo Camera digital elevation models
Mangold, Nicolas; Neukum, Gerhard; Masson, Philippe +2 more
Martian valley networks have been identified mainly in the Noachian heavily cratered uplands. The geometry of valley networks can be studied using Mars Orbiter Laser Altimeter (MOLA) altimetry, which is sufficient to map large valleys without a detailed 3-D shape of valley networks. Imaging from the Mars Express High Resolution Stereo Camera (HRSC…
Time evolution of the line emission from the inner circumstellar ring of SN 1987A and its hot spots
Lundqvist, P.; Spyromilio, J.; Gröningsson, P. +4 more
We present seven epochs between October 1999 and November 2007 of high resolution VLT/UVES echelle spectra of the ejecta-ring collision of SN 1987A. The fluxes of most of the narrow lines from the unshocked gas decreased by a factor of 2-3 during this period, consistent with the decay from the initial ionization by the shock break-out. However, [O…
The broad-band XMM-Newton and INTEGRAL spectra of bright type 1 Seyfert galaxies
de Rosa, A.; Walter, R.; Bird, A. J. +7 more
Aims: The 0.5-150 keV broad-band spectra of a sample of nine bright type 1 Seyfert galaxies are analyzed here. These sources have been discovered/detected by INTEGRAL and subsequently observed with XMM-Newton for the first time with high sensitivity below 10 keV. The sample, although small, is representative of the population of type 1 AGN which a…
Ultraviolet observations of Phoebe from the Cassini UVIS
Hendrix, Amanda R.; Hansen, Candice J.
Observations of Saturn's distant moon Phoebe were made at far-ultraviolet (FUV) (1100-1900 Å) and extreme-ultraviolet (EUV) (600-1100 Å) wavelengths by the Cassini Ultraviolet Imaging Spectrograph (UVIS) during the Cassini spacecraft flyby on June 11, 2004. These are the first UV spectra of Phoebe and the first detection of water ice on a Solar Sy…
A Catalog of Bright Star Clusters in the Interacting Galaxy M51
Hwang, Narae; Lee, Myung Gyoon
We present a catalog of star clusters with V F555W < 23 mag detected in the interacting spiral galaxy M51 system based on mosaic images taken with the Hubble Space Telescope Advanced Camera for Surveys by the Hubble Heritage Team. We have selected about 3600 clusters based on their morphological information through visual inspection.…
INTEGRAL observations of Hercules X-1
Tsygankov, S.; Klochkov, D.; Santangelo, A. +6 more
Aims: We investigate the X-ray spectral and timing properties of the accreting X-ray pulsar Her X-1 observed with the INTEGRAL satellite in July-August 2005.
Methods: The data analyzed in this work cover a substantial part of one main-on state of the source. The short time scale pulse period development is measured. X-ray pulse profiles for di…
BAT X-Ray Survey. I. Methodology and X-Ray Identification
Greiner, J.; Strong, A. W.; Ajello, M. +3 more
We applied the maximum likelihood (ML) method, as an image reconstruction algorithm, to the BAT X-Ray Survey (BXS). This method was specifically designed to preserve the full statistical information in the data and to avoid mosaicking of many exposures with different pointing directions, thus reducing systematic errors when co-adding images. We re…
Chandrayaan-1 mission to the Moon
Goswami, Jitendra Nath; Annadurai, Mylswamy
Chandrayaan-1 is the first Indian planetary exploration mission that will perform remote sensing observation of the Moon to further our understanding about its origin and evolution. Hyper-spectral studies in the 0.4- 3µm region using three different imaging spectrometers, coupled with a low energy X-ray spectrometer, a sub-keV atom analyzer,…
Suzaku Observations of Hercules X-1: Measurements of the Two Cyclotron Harmonics
Dotani, Tadayasu; Enoto, Teruaki; Kokubun, Motohide +10 more
The accretion-powered pulsar Her X-1 was observed with Suzaku twice in its main-on state, on 2005 October 5--6 and 2006 March 29--30, for a net exposure of 30.5ks and 34.4ks, respectively. In the 2005 and 2006 observations, the source was detected at an average 10--30keV intensity of 290mCrab and 230mCrab, respectively. The intrinsic pulse period …
Measurements of methane absorption by the descent imager/spectral radiometer (DISR) during its descent through Titan's atmosphere
Tomasko, M. G.; Bézard, B.; Doose, L. +2 more
New low-temperature methane absorption coefficients pertinent to the Titan environment are presented as derived from the Huygens DISR spectral measurements combined with the in-situ measurements of the methane gas abundance profile measured by the Huygens Gas Chromatograph/Mass Spectrometer (GCMS). The visible and near-infrared spectrometers of th…