Search Publications
Missions
Journals
Publication Years
Stagnant exterior cusp region as viewed by energetic electrons and ions: A statistical study using Cluster Research with Adaptive Particle Imaging Detectors (RAPID) data
Zhang, H.; Zong, Q. -G.; Daly, P. W. +1 more
We present statistical results based on the data set obtained by Cluster when these spacecraft were in the dayside cusp and magnetopause. Forty clearest stagnant exterior cusp (SEC) events have been selected from ∼150 cusp crossings from 1 January to 30 April 2001 and from 1 March to 30 April 2002. The identification of the SECs was made on the ba…
From young massive star cluster to old globular: the LV-σ0 relationship as a diagnostic tool
de Grijs, Richard; Tadhunter, Clive N.; Wilkinson, Mark I.
We present a new analysis of the properties of the young massive star clusters (YMCs) forming profusely in intense starburst environments, which demonstrates that these objects are plausible progenitors of the old globular clusters (GCs) seen abundantly in the Local Group. The method is based on the tight relationship for old GCs between their V-b…
The influence of the solar particle and radiation environment on Titan’s atmosphere evolution
Lammer, H.; Penz, T.; Biernat, H. K. +1 more
Measurements of the 15N/ 14N isotope ratio in Titan's atmosphere by Earth-based millimetric wavelength spectroscopic observations of HC 15N/HC 14N indicate that the bulk nitrogen may be enriched in the heavy isotope 15N by about 3.9-4.5 times relative to the terrestrial value. For the explanat…
The fingerprint of binary intermediate-mass black holes in globular clusters: suprathermal stars and angular momentum alignment
Possenti, A.; Mapelli, M.; Sigurdsson, S. +1 more
We explore the signatures that a binary intermediate-mass black hole (IMBH) imprints on the velocity and on the angular momentum of globular cluster (GC) stars. Simulating three-body encounters between a star and a binary IMBH, we find that the binary IMBH generates a family of a few hundred stars (~100-300) which remain bound to the GC and have v…
16 µm Imaging around the Hubble Deep Field-North with the Spitzer IRS
Chary, R.; Armus, L.; Charmandaris, V. +3 more
We present a pilot study of 16 µm imaging within the GOODS northern field. Observations were obtained using the ``peak-up'' imaging capability of the Spitzer IRS. We survey 35 arcmin2 to an average 3 σ depth of 0.075 mJy and detect 149 sources. The survey partially overlaps the area imaged at 15 µm by the ISO, and we demonst…
HD 121190: A cool multiperiodic slowly pulsating B star with moderate rotation
Aerts, C.; Kolenberg, K.
We have gathered and analysed multicolour Geneva photometry and high-resolution spectroscopy of the stars HD 121190 (B9V) and HD 106419 (B9III) whose short-term periodic variability had become evident from their HIPPARCOS data. We find three significant frequencies for HD 121190 in the Geneva data: 2.6831, 2.6199 and 2.4713 c d-1 and cl…
X-ray to UV variability correlation in MCG-6-30-15
Papadakis, I.; Arévalo, P.; Kuhlbrodt, B. +1 more
We used a ∼ 300 ks long XMM-Newton observation of the Seyfert 1 galaxy MCG-6-30-15 to study the correlation between the 0.2-10 keV X-ray and the 3000-4000 ÅU bands. We found a significant correlation peak at a time lag of τmax ∼ 160 ks where the UV flux variations preceded the variations in the X-ray band. We interpret this result as ev…
X-ray tomography of a cometary bow shock
Dennerl, K.; Wegmann, R.
The volume intensity of the cometary X-ray emission is enhanced behind the bow shock by a factor of up to three. This effect offers the opportunity to identify the bow shock by a tomographic method in X-ray images of comets. By an analysis of the X-ray data obtained by XMM-Newton from Comet C/2000 WM1 (LINEAR) we obtain information on the position…
A changing inner radius in the accretion disc of Q0056-363?
Maiolino, R.; Bianchi, S.; Falocco, S. +4 more
Q0056-363 is the most powerful X-ray quasar known to exhibit a broad, likely relativistic iron line (Porquet & Reeves 2003, A&A, 408, 119). It has been observed twice by XMM-Newton, three and half years apart (July 2000 and December 2003). In the second observation, the UV and soft X-ray fluxes were fainter, the hard X-ray power law flatte…
Recovering Solar Toroidal Field Dynamics from Sunspot Location Patterns
Norton, Aimee A.; Gilman, Peter A.
We analyze both Kitt Peak magnetogram data and MDI continuum intensity sunspot data to search for the following solar toroidal band properties: width in latitude and the existence of a tipping instability (longitudinal m=1 mode) for any time during the solar cycle. In order to determine the extent to which we can recover the toroidal field dynamic…