Search Publications
Solar system: Saturn's tides control Enceladus' plume
Spencer, John
Data obtained by the Cassini spacecraft show that the plume of ice particles at the south pole of Saturn's moon Enceladus is four times brighter when the moon is farthest away from the planet than when it is closest. See Letter p.182
Identification of four X-ray sources from the INTEGRAL and Swift catalogs
Tsygankov, S. S.; Lutovinov, A. A.; Eselevich, M. V. +5 more
Four hard X-ray sources from the INTEGRAL and Swift catalogs have been identified. X-ray and optical spectra have been obtained for each of the objects being studied by using data from the INTEGRAL, Swift, ROSAT, and Chandra X-ray observatories as well as observations with the RTT-150 and AZT-33IK optical telescopes. Two sources (SWIFT J1553.6+260…
A young hierarchical triple system harbouring a candidate debris disc
Henning, Th.; Olofsson, J.; Schlieder, J. E. +2 more
We report the detection of a wide young hierarchical triple system where the primary has a candidate debris disc. The primary, TYC 5241-986-1 A, is a known Tycho star which we classify as a late-K star with emission in the X-ray, near- and far-ultraviolet (UV) and Hα suggestive of youth. Its proper motion, photometric distance (65-105 pc) and radi…
Sunyaev-Zel'dovich observations with AMI of the hottest galaxy clusters detected in the XMM-Newton Cluster Survey
Romer, A. Kathy; AMI Consortium; Olamaie, Malak +18 more
We have obtained deep Sunyaev-Zel'dovich (SZ) observations towards 15 of the hottest XMM Cluster Survey (XCS) clusters that can be observed with the Arcminute Microkelvin Imager (AMI). We use a Bayesian analysis to quantify the significance of our SZ detections. We detect the SZ effect at high significance towards three of the clusters and at lowe…
Direct Observations of Plasma Upflows and Condensation in a Catastrophically Cooling Solar Transition Region Loop
Patel, M.; Champey, P.; Orange, N. B. +3 more
Minimal observational evidence exists for fast transition region (TR) upflows in the presence of cool loops. Observations of such occurrences challenge notions of standard solar atmospheric heating models as well as their description of bright TR emission. Using the EUV Imaging Spectrometer on board Hinode, we observe fast upflows (v λ …
The Atmosphere and Climate of Venus
Bullock, Mark A.; Grinspoon, David H.
Venus lies just sunward of the inner edge of the Sun's habitable zone. Liquid water is not stable. Like Earth and Mars, Venus probably accreted at least an ocean's worth of water, although there are alternative scenarios. The loss of this water led to the massive, dry CO2 atmosphere, extensive H2SO4 clouds (at least some of the time), and an inten…
M31 Globular Cluster Structures and the Presence of X-Ray Binaries
Barmby, P.; Agar, J. R. R.
The Andromeda galaxy, M31, has several times the number of globular clusters found in the Milky Way. It contains a correspondingly larger number of low-mass X-ray binaries (LMXBs) associated with globular clusters, and as such can be used to investigate the cluster properties that lead to X-ray binary formation. The best tracer of the spatial stru…
Deep optical imaging of the γ-ray pulsar J1048-5832 with the VLT
Sollerman, J.; Kirichenko, A.; Zyuzin, D. +2 more
Context. PSR J1048-5832 is a young radio-pulsar that has recently been detected in γ-rays with Fermi, and also in X-rays with Chandra and XMM-Newton. It powers a compact pulsar wind nebula visible in X-rays and is in many ways similar to the Vela pulsar.
Aims: We present deep optical observations made with the ESO Very Large Telescope to sear…
Star forming regions in a sample of HST spiral galaxies
Dapergolas, A.; Kontizas, M.; Kontizas, E. +2 more
Aims: The presence of small- and large-scale star formation structures in a sample of six spiral Hubble Space Telescope (HST) galaxies is investigated to identify small structures of young stars known as OB associations and to tell whether they are formed inside larger scale star forming stellar structures in a hierarchical form.
Methods…
Local Variability in the Orbit of Saturn's F Ring
Cooper, N. J.; Murray, C. D.; Williams, G. A.
We present an analysis of the orbit of Saturn's F ring using images recorded by the Imaging Science Subsystem of the Cassini spacecraft. A total of 9805 observations have been made from 10 image sequences obtained between 2006 November 23 and 2009 July 28. Each sequence of up to 240 images spans a single orbit of the F ring, allowing 10 independen…