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XMM-Newton observations of the INTEGRAL X-ray transient IGR J17544-2619
Parmar, A. N.; Kuulkers, E.; González-Riestra, R. +2 more
On September 17, 2003 INTEGRAL discovered a bright transient source 3° from the Galactic Center,
Asteroseismology of the β Cephei star ν Eridani - III. Extended frequency analysis and mode identification
Handler, G.; De Ridder, J.; Heiter, U. +7 more
Using the large photometric and spectroscopic data sets of the ν Eridani multisite campaign given in our two recent papers (Aerts et al. and Handler et al.), we present an extended frequency analysis and a photometric mode identification. For the extended frequency analysis, we used an improved radial velocity time series, the second-moment time s…
UV-photoprocessing of interstellar ice analogs: Detection of hexamethylenetetramine-based species
Schutte, W. A.; Greenberg, J. M.; Muñoz Caro, G. M. +2 more
The physical conditions governing the dense cloud environment are reproduced in a high vacuum experimental setup at low temperature T ≈ 12 K. The accretion and photoprocessing of ices on grain surfaces is simulated by depositing an ice layer on a cold finger, while it is irradiated by ultraviolet (UV) photons. After irradiation the sample is slowl…
Revisiting the Origin of Impulsive Electron Events: Coronal Magnetic Restructuring
Maia, Dalmiro Jorge Filipe; Pick, Monique
We revisit the impulsive beamlike particle events detected in situ from 1997 to 2000 by the Electron, Proton, and Alpha Monitor (EPAM) experiment on the Advanced Composition Explorer spacecraft. We study in detail a subset of events for which there are radio coronal observations from the Nançay Radioheliograph. EPAM measures electrons in the energ…
Chandra and Hubble Space Telescope Confirmation of the Luminous and Variable X-Ray Source IC 10 X-1 as a Possible Wolf-Rayet, Black Hole Binary
Brandt, W. N.; Bauer, Franz E.
We present a Chandra and Hubble Space Telescope study of IC 10 X-1, the most luminous X-ray binary in the starburst galaxy closest to the Milky Way. Our new hard X-ray observation of X-1 confirms that it has an average 0.5-10 keV luminosity of 1.5×1038 ergs s-1, is strongly variable (a factor of ~2 in <~3 ks), and is spati…
Emission of CO, C I, and C II in W3 Main
Schneider, N.; Stutzki, J.; Kramer, C. +3 more
We used the KOSMA 3m telescope to map the core 7' × 5' of the Galactic massive star forming region W3 Main in the two fine structure lines of atomic carbon and four mid-J transitions of CO and 13CO. The maps are centered on the luminous infrared source IRS 5 for which we obtained ISO/LWS data comprising four high-J CO transitions, [C II…
Photometry of Magellanic Cloud clusters with the Advanced Camera for Surveys - I. The old Large Magellanic Cloud clusters NGC 1928, 1939 and Reticulum
Mackey, A. D.; Gilmore, G. F.
We present the results of photometric measurements from images of the Large Magellanic Cloud (LMC) globular clusters NGC 1928, 1939 and Reticulum taken with the Advanced Camera for Surveys on the Hubble Space Telescope. Exposures through the F555W and F814W filters result in high-accuracy colour-magnitude diagrams (CMDs) for these three clusters. …
Energy-flux relationship in the FUV Jovian aurora deduced from HST-STIS spectral observations
Clarke, J. T.; Cowley, S. W. H.; Grodent, D. +3 more
Far ultraviolet spectral observations of the Jovian aurora have been made since 1997 with the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope at low spectral resolution. The combination of the spectral resolution with the intensity variation along the STIS slit provides information on the latitudinal variation of th…
A possible auroral signature of a magnetotail reconnection process on Jupiter
Clarke, J. T.; Waite, J. H.; Grodent, D. +2 more
Several theoretical models and in situ observations consistently suggest that the process of nightside reconnection associated with Earth's magnetospheric substorms is also taking place in the midnight tail region of Jupiter. We report the observation of a new auroral feature which takes the form of isolated spots appearing near the northern dusk-…
Mid-IR observations of Galactic H II regions: Constraining ionizing spectra of massive stars and the nature of the observed excitation sequences
Morisset, C.; Schaerer, D.; Bouret, J. -C. +1 more
Extensive photoionization model grids for single star H II regions using state-of-the-art stellar atmosphere models have been computed to test their predicted ionizing spectra against recent ISO mid-IR observations of Galactic H II regions. Particular care has been paid to examining in detail the dependences of the nebular properties on the numero…