Search Publications
Spitzer Observations of Shock-excited Hydrogen Deuteride in IC 443C, HH 7, and HH 54: Probing the Gas-phase Deuterium Abundance in the Dense Interstellar Medium
Watson, Dan M.; Yuan, Yuan; Neufeld, David A. +2 more
We present and analyze observations—carried out using the Infrared Spectrograph (IRS) on the Spitzer Space Telescope—of the R(3) and R(4) pure rotational lines of hydrogen deuteride (HD) detected from shock-heated material associated with the supernova remnant IC 443C and with the Herbig-Haro objects HH 7 and HH 54. Assuming a continuous temperatu…
An extended XMM-Newton observation of the Seyfert galaxy NGC 4051 - III. Fe K emission and absorption
Vaughan, S.; Pounds, K. A.
An extended XMM-Newton observation of the Seyfert 1 galaxy NGC 4051 in 2009 detected a photoionized outflow with a complex absorption-line velocity structure and a broad correlation of velocity with ionization parameter, shown by Pounds & Vaughan to be consistent with a highly ionized, high-velocity wind running into the interstellar medium or…
Electromagnetic models and inversion techniques for Titan’s Ontario Lacus depth estimation from Cassini RADAR data
Hayes, Alexander G.; Notarnicola, Claudia; Wye, Lauren +3 more
Since 2004, Cassini RADAR, operating at 13.8 GHz as a radiometer, scatterometer, altimeter and synthetic aperture radar (SAR), provides a vast amount of data, suggesting new scenarios for Titan’s morphology and evolution. An important result was the detection of lakes constituted by liquid hydrocarbons, thus supporting the hypothesis of a methane …
The Huygens surface science package (SSP): Flight performance review and lessons learned
Lorenz, R. D.; Leese, M. R.; Hathi, B. +1 more
The Surface Science Package (SSP) was one of six instruments flown onboard the Huygens probe to Titan, the largest moon of Saturn, in the framework of the NASA/ESA/ASI Cassini-Huygens mission (Matson et al., 2002). The SSP operated throughout the probe's descent and after landing on Titan on 14th January 2005. This paper reviews scientific results…
The Evolution of Sunspot Magnetic Fields Associated with a Solar Flare
Gallagher, Peter T.; Murray, Sophie A.; Bloomfield, D. Shaun
Solar flares occur due to the sudden release of energy stored in active-region magnetic fields. To date, the precursors to flaring are still not fully understood, although there is evidence that flaring is related to changes in the topology or complexity of an active-region's magnetic field. Here, the evolution of the magnetic field in active regi…
Akari Far-Infrared All-Sky Survey Maps
Nakagawa, Takao; Doi, Yasuo; Takita, Satoshi +13 more
Far-infrared observations provide crucial data for the investigation and characterisation of the properties of dusty material in the Interstellar Medium (ISM), since most of its energy is emitted between ~100 and 200 um. We present the first all-sky image from a sensitive all-sky survey using the Japanese AKARI satellite, in the wavelength range 5…
Quasi-periodic frequency fluctuations observed during coronal radio sounding experiments 1991-2009
Pätzold, M.; Bird, M. K.; Efimov, A. I. +5 more
Coronal radio sounding experiments were carried out using the dual-frequency signals of the spacecraft Ulysses, Galileo, Mars Express, Venus Express, and Rosetta. The change in differential frequency recorded at the NASA and ESA ground stations, a quantity sensitive only to the plasma along the radio ray path from spacecraft to receiver, has been …
What is the true nature of blinkers?
Doyle, J. G.; Madjarska, M. S.; Bewsher, D. +1 more
Aims: The aim of this work is to identify the true nature of the transient EUV brightenings, called blinkers.
Methods: Co-spatial and co-temporal multi-instrument data, including imaging (EUVI/STEREO, XRT and SOT/Hinode), spectroscopic (CDS/SoHO and EIS/Hinode) and magnetogram (SOT/Hinode) data, of an isolated equatorial coronal hole wer…
Spectroscopic Follow-up of X-Ray Sources in the ChaMPlane Survey: Identification of a New Cataclysmic Variable
van den Berg, M.; Allen, B.; Servillat, M. +3 more
We present a multi-object optical spectroscopy follow-up study of X-ray sources in a field along the Galactic plane (l = 327fdg42, b = 2fdg26) which is part of the Chandra Multi-wavelength Plane survey (ChaMPlane). We obtained spectra for 46 stars, including 15 likely counterparts to X-ray sources, and sources showing an Hα color excess. This has …
Submillimetre source counts in the fields of high-redshift galaxy clusters
Gladders, M. D.; Ivison, R. J.; Hoekstra, H. +11 more
We present a submillimetre survey of seven high-redshift galaxy clusters (0.64 < z < 1.0) using the Submillimetre Common-User Bolometer Array (SCUBA) at 850 and 450 ?m. The targets, of similar richness and redshift, are selected from the Red-sequence Cluster Survey (RCS). We use this sample to investigate the apparent excess of submillimetre…