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Chandra and HST Study of a New Transient X-Ray Source in M31
Williams, Benjamin F.; McClintock, Jeffrey E.; Murray, Stephen S. +2 more
We present X-ray and optical observations of a new transient X-ray source in M31 first detected 2004 May 23 at R.A.=00h43m09.940s+/-0.65", decl.=41deg23'32.49"+/-0.66". The X-ray light curve shows two peaks separated by several months, reminiscent of many Galactic X-ray novae. The location and X-ray spec…
Late Stages of Stellar Evolution
Blommaert, Joris A. D. L.; Cami, Jan; Szczerba, Ryszard +1 more
A large fraction of ISO observing time was used to study the late stages of stellar evolution. Many molecular and solid state features, including crystalline silicates and the rotational lines of water vapour, were detected for the first time in the spectra of (post-)Asymptotic Giant Branch (AGB) stars. Their analysis has greatly improved our know…
Kinematics of ionized gas in the barred Seyfert galaxy NGC 4151
Mundell, C. G.; Pedlar, A.; Asif, M. W.
We have determined the structure and kinematics of ionized gas in the weak oval bar of the archetypal Seyfert 1 galaxy, NGC 4151, using the TAURUS Fabry-Perot interferometer to simultaneously map the distribution and kinematics of Hβ emission. We also present broad-band ultraviolet imaging of the host galaxy, obtained with XMM-Newton, which shows …
XMM-Newton observations of the Mouse, SLX 1744 299 and SLX 1744 300
Maeda, Yoshitomo; Pavlov, George G.; Mori, Hideyuki +2 more
We observed the radio and X-ray source G359.23-0.82, also known as "the Mouse", with XMM-Newton. The X-ray image of this object shows a point-like source at the Mouse's "head", accompanied by a "tail" that extends for about 40″ westward. The morphology is consistent with that observed recently with Chandra [Gaensler, B.M., van der Swaluw, E., Cami…
Cold dust in (some) high-z supernova host galaxies
Clements, D. L.; Farrah, D.; Fox, M. +3 more
We present deep submillimetre photometry for 14 galaxies at z= 0.5 that are hosts of Type Ia supernovae, with the aim of examining the evolution of dust mass and extinction in normal galaxies. We combine these results with our previous observations of 17 z~ 0.5 SN1a hosts to look for any evolution in the dust content of normal galaxies between z= …
Sub-arcsecond imaging of the radio continuum and neutral hydrogen in the Medusa merger
Aalto, S.; Beswick, R. J.; Hüttemeister, S. +1 more
We present sub-arcsecond, Multi-Element Radio Linked Interferometer (MERLIN) observations of the decimetre radio continuum structure and neutral hydrogen (Hi) absorption from the nuclear region of the starburst galaxy NGC 4194 (the Medusa Merger). The continuum structure of the central kiloparsec of the Medusa has been imaged, revealing a pair of …
Cluster observations of bounday layer structure and a flux transfer event near the cusp
Balogh, A.; Fazakerley, A. N.; Kistler, L. M. +6 more
On the 25th January 2002 between 10:00 and 12:00 UT, the four Cluster spacecraft passed through the northern high-latitude cusp, the dayside magnetosphere and into the magnetosheath in a linear formation. In the magnetosphere the PEACE electron spectrometers on the four spacecraft all observed a series of transient bursts of magnetosheath-like pla…
The GRB 011211 X-Ray Lines: Toward Resolving the Significance Debate
Ricker, G.; Vanderspek, R.; Ford, P. +4 more
We demonstrate for the GRB 011211 X-ray afterglow lines that the significance estimation methods used by Reeves et al. and Rutledge & Sako are consistent and that the conflicting estimates found by those authors arise from different assumptions in the continuum modeling. If the column density is fixed at the Galactic value as in the Reeves et …
Smart-1: An analysis of flight data
Di Cara, Davina M.; Estublier, Denis
The main purpose of the ESA SMART-1 mission, (Small Mission for Advanced Research and Technology), is to flight-test a new Primary Electric Propulsion sub-System (EPS), a highly efficient and lightweight propulsion sub-System that will eventually be used for long duration deep-space missions, reducing the size and the cost of the propulsion system…
A corrector for spacecraft calculated electron moments
Génot, V.; Fazakerley, A. N.; Schwartz, S. J. +3 more
We present the application of a numerical method to correct electron moments calculated on-board spacecraft from the effects of potential broadening and energy range truncation. Assuming a shape for the natural distribution of the ambient plasma and employing the scalar approximation, the on-board moments can be represented as non-linear integral …