Search Publications
Photometry with a periodic grid. II. Results for J2 Europa and S6 Titan
Hestroffer, D.
The Hipparcos satellite successfully gathered astrometric and photometric information for a few solar system objects including natural satellites. In contrast to the case for asteroids, the Hipparcos main-mission does not provide the photometry - in the conventional sense - of planetary satellites. Nevertheless, valuable photometric results can be…
A transient event in lines of Ne V, VI and VII
Jordan, C.; Houdebine, E. R.
We report observations of a transition region brightening made with the Coronal Diagnostic Spectrometer onboard the Solar and Heliospheric Observatory. We observed a region of the quiet Sun in 12 spectral lines with temperatures of formation from =~ 3 x 104 K to 1.1 x 106 K. The transient event occured in a network boundary r…
Testing SPI imaging of high-energy and extended sources
Strong, A. W.; Wunderer, C. B.; Connell, P. +2 more
INTEGRAL's main instruments employ coded apertures to obtain directional information on the incoming radiation. In order to experimentally better determine the imaging capabilities of the spectrometer SPI, the SPI Imaging Test Setup (SPITS) has been built at MPE. It consists of the SPI coded mask and two SPI-identical Ge detectors on an XY-table w…
Reduction of ringing effects by an improved deconvolution algorithm. Application to A370 CFHT image of gravitational arcs
Mellier, Y.; Aime, C.; Roche, M. +2 more
We develop a self-consistent automatic procedure to restore information from astronomical observations. It relies on both a new deconvolution algorithm called LBCA (Lower Bound Constraint Algorithm) and the use of the Wiener filter. In order to explore its scientific potential for strong and weak gravitational lensing, we process a CFHT image of t…
The rich 6 to 9 vec mu m spectrum of interstellar PAHs
Hony, S.; Tielens, A. G. G. M.; Allamandola, L. J. +4 more
IR spectroscopy provides a valuable tool for the characterisation and identification of interstellar molecular species. Here, we present 6-9 µm spectra of a sample of reflection nebulae, HII regions, YSOs, evolved stars and galaxies that show strong unidentified infrared bands, obtained with the SWS spectrograph on board ISO. The IR emission…
The bulk of the cosmic infrared background resolved by ISOCAM
Aussel, H.; Elbaz, D.; Franceschini, A. +4 more
Deep extragalactic surveys with ISOCAM revealed the presence of a large density of faint mid-infrared (MIR) sources. We have computed the 15 mu m integrated galaxy light produced by these galaxies above a sensitivity limit of 50 mu Jy. It sets a lower limit to the 15 mu m extragalactic background light of (2.4 +/- 0.5) nW m-2 sr-1<…
X-ray background measurements with XMM-Newton EPIC
De Luca, A.; Warwick, R. S.; Page, M. +1 more
We discuss the methods used to compile a high signal-to-noise dataset representative of both the instrumental and cosmic background signal measured at high galactic latitude by the XMM-Newton EPIC cameras. The characteristics of the EPIC background are described and the potential applications of the derived dataset in general science analysis are …
HST color-magnitude diagrams of 74 galactic globular clusters in the HST F439W and F555W bands
Djorgovski, S. G.; Recio-Blanco, A.; Zoccali, M. +9 more
We present the complete photometric database and the color-magnitude diagrams for 74 Galactic globular clusters observed with the HST/WFPC2 camera in the F439W and F555W bands. A detailed discussion of the various reduction steps is also presented, and of the procedures to transform instrumental magnitudes into both the HST F439W and F555W flight …
Re-examining the X-ray versus spin-down luminosity correlation of rotation powered pulsars
Mereghetti, S.; Possenti, A.; Cerutti, R. +1 more
The empirical relation between the X-ray luminosity (in the 2-10 keV band) and the rate of spin-down energy loss Lsd of a sample of 39 pulsars is re-examined considering recent data from ASCA, RXTE, BeppoSAX, Chandra, and XMM-Newton and including statistical and systematic errors. The data show a significant scatter around an average co…
The M 81 group of galaxies: New distances, kinematics and structure
Sarajedini, A.; Dolphin, A. E.; Grebel, E. K. +7 more
We present Hubble Space Telescope/WFPC2 images of the galaxies NGC 2366, NGC 2976, NGC 4236, IC 2574, DDO 53, DDO 82, DDO 165, Holmberg I, Holmberg II, Holmberg IX, K52, K73, BK3N, Garland, and A0952+69 in the M 81 complex. Their true distance moduli, derived from the brightness of the tip of the red giant branch, lie in the range of 27fm 52 (NGC …