Search Publications
A Giant Metrewave Radio Telescope/Chandra view of IRAS 09104+4109: a type 2 QSO in a cooling flow
Donahue, Megan; Hoekstra, Henk; Babul, Arif +8 more
IRAS 09104+4109 is a rare example of a dust enshrouded type 2 quasi-stellar object (QSO) in the centre of a cool-core galaxy cluster. Previous observations of this z = 0.44 system showed that, as well as powering the hyperluminous infrared emission of the cluster-central galaxy, the QSO is associated with a double-lobed radio source. However, the …
Herschel/PACS observations of young sources in Taurus: the far-infrared counterpart of optical jets
Pinte, C.; Dent, W. R. F.; Kamp, I. +8 more
Context. Observations of the atomic and molecular line emission associated with jets and outflows emitted by young stellar objects provide sensitive diagnostics of the excitation conditions, and can be used to trace the various evolutionary stages they pass through as they evolve to become main sequence stars.
Aims: To understand the relevanc…
Further X-ray observations of the galaxy cluster PKS 0745-191 to the virial radius and beyond
Fabian, A. C.; Sanders, J. S.; Walker, S. A. +1 more
We use new Suzaku observations of PKS 0745-191 to measure the thermodynamic properties of its intracluster medium (ICM) out to and beyond r200 (reaching 1.25r200) with better accuracy than previously achieved, owing to a more accurate and better understood background model. We investigate and resolve the tensions between the …
The Location of Solar Metric Type II Radio Bursts with Respect to the Associated Coronal Mass Ejections
Ramesh, R.; Kathiravan, C.; Gopalswamy, N. +2 more
Forty-one solar type II radio bursts located close to the solar limb (projected radial distance r >~ 0.8 R ⊙) were observed at 109 MHz by the radioheliograph at the Gauribidanur observatory near Bangalore during the period 1997-2007. The positions of the bursts were compared with the estimated location of the leading edge (LE) of the…
Photometric determination of the mass accretion rates of pre-mainsequence stars - III. Results in the Large Magellanic Cloud
Panagia, N.; De Marchi, G.; Sicilia-Aguilar, A. +2 more
We present a multi-wavelength study of three star forming regions, spanning the age range 1-14 Myr, located between the 30 Doradus complex and supernova SN1987A in the Large Magellanic Cloud (LMC). We reliably identify about 1000 pre-main sequence (PMS) star candidates actively undergoing mass accretion and estimate their stellar properties and ma…
GRIPS - Gamma-Ray Imaging, Polarimetry and Spectroscopy
Fransson, Claes; Leibundgut, Bruno; Wilms, Jörn +65 more
We propose to perform a continuously scanning all-sky survey from 200 keV to 80 MeV achieving a sensitivity which is better by a factor of 40 or more compared to the previous missions in this energy range (COMPTEL, INTEGRAL; see Fig. 1). These gamma-ray observations will be complemented by observations in the soft X-ray and (near-)infrared region …
The metal-enriched host of an energetic γ-ray burst at z ≈ 1.6
Geier, S.; Milvang-Jensen, B.; Fynbo, J. P. U. +7 more
Context. The star-forming nature of long γ-ray burst (GRB) host galaxies provides invaluable constraints on the progenitors of GRBs and might open a short-cut to the characteristics of typical star-forming galaxies throughout the history of the Universe. Due to the absence of near-infrared (NIR) spectroscopy, however, detailed investigations, spec…
Tracking down R Coronae Borealis stars from their mid-infrared WISE colours
Tisserand, P.
Context. R Coronae Borealis stars (RCBs) are hydrogen-deficient and carbon-rich supergiant stars. They are very rare, with only ~50 actually known in our Galaxy. Interestingly, RCBs are strongly suspected of being the evolved merger product of two white dwarfs and could therefore be an important tool for understanding supernovae type Ia in the dou…
Possible tropical lakes on Titan from observations of dark terrain
Tomasko, Martin G.; Brown, Robert H.; Griffith, Caitlin A. +5 more
Titan has clouds, rain and lakes--like Earth--but composed of methane rather than water. Unlike Earth, most of the condensable methane (the equivalent of 5 m depth globally averaged) lies in the atmosphere. Liquid detected on the surface (about 2 m deep) has been found by radar images only poleward of 50° latitude, while dune fields pervade the tr…
Energetic neutral atom observations of magnetic anomalies on the lunar surface
Barabash, S.; Holmström, M.; Futaana, Y. +5 more
SARA, the Sub-KeV Atom Analyzer, on board Chandrayaan-1 recorded the first image of a minimagnetosphere above a lunar magnetic anomaly using energetic neutral atoms (ENAs). It was shown that this magnetosphere, which is located near the Gerasimovich crater, is able to reduce the solar wind ion flux impinging onto the lunar surface by more than 50%…