Search Publications
A systematic study of low-mass X-ray binaries in the M31 globular cluster system
Kundu, Arunav; Zepf, Stephen E.; Maccarone, Thomas J. +1 more
We investigate low-mass X-ray binaries (LMXBs) in the M31 globular cluster (GC) system using data from the 2XMMi catalogue. These X-ray data are based on all publicly available XMM-Newton observations of the galaxy. This new survey provides the most complete and homogeneous X-ray survey of M31's GCs to date, covering >80 per cent of the confirm…
A Very Large Telescope imaging and spectroscopic survey of the Wolf-Rayet population in NGC7793
Crowther, P. A.; Bibby, J. L.
We present a Very Large Telescope/Focal Reducer and Low Dispersion Spectrograph #1 (VLT/FORS1) imaging and spectroscopic survey of the Wolf-Rayet (WR) population in the Sculptor group spiral galaxy NGC7793. We identify 74 emission-line candidates from archival narrow-band imaging, from which 39 were observed with the Multi Object Spectroscopy mode…
Dike indicators in the Hadriaca Patera-Promethei Terra region, Mars
Korteniemi, Jarmo; Raitala, Jouko; Aittola, Marko +4 more
The eastern Hellas basin rim has been highly modified by a multitude of both volcanic and fluvial processes. It is covered by a large part of the Circum-Hellas Volcanic Province, consisting of the volcanic plains of Hesperia Planum and western Promethei Terra, as well as the two central volcanoes Hadriaca and Tyrrhena Patera and their associated l…
Non-detection of impulsive radio signals from lightning in Martian dust storms using the radar receiver on the Mars Express spacecraft
Gurnett, D. A.; Morgan, D. D.; Farrell, W. M. +3 more
Here we report the results of a nearly five-year search for impulsive radio signals from lightning discharges in Martian dust storms using the radar receiver on the Mars Express spacecraft. The search covered altitudes from 275 km to 1400 km and frequencies from 4.0 to 5.5 MHz with a time resolution of 91.4 µs and a detection threshold of 2.…
Dispelling Illusions of Reflection: A New Analysis of the 2007 May 19 Coronal "Wave" Event
Attrill, Gemma D. R.
A new analysis of the 2007 May 19 coronal wave-coronal mass ejection-dimmings event is offered employing base difference extreme-ultraviolet (EUV) images. Previous work analyzing the coronal wave associated with this event concluded strongly in favor of purely an MHD wave interpretation for the expanding bright front. This conclusion was based to …
An X-ray-selected Galaxy Cluster in the Lockman Hole at Redshift 1.753
Egami, Eiichi; Finoguenov, Alexis; Salvato, Mara +12 more
We have discovered an X-ray-selected galaxy cluster with a spectroscopic redshift of 1.753. The redshift is of the brightest cluster galaxy (BCG), which is coincident with the peak of the X-ray surface brightness. We also have concordant photometric redshifts for seven additional candidate cluster members. The X-ray luminosity of the cluster is (3…
Discovery of a Luminous Blue Variable with an Ejection Nebula Near the Quintuplet Cluster
Glass, I. S.; Morris, M. R.; Wang, Q. D. +5 more
We report on the discovery of a luminous blue variable (LBV) lying ≈7 pc in projection from the Quintuplet cluster. This source, which we call LBV G0.120 - 0.048, was selected for spectroscopy owing to its detection as a strong source of Paschen-α (Pα) excess in a recent narrowband imaging survey of the Galactic center region with the Hubble Space…
Quaoar: A Rock in the Kuiper Belt
Fraser, Wesley C.; Brown, Michael E.
Here we report Wide-Field Planetary Camera 2 observations of the Quaoar-Weywot Kuiper Belt binary. From these observations, we find that Weywot is on an elliptical orbit with an eccentricity of 0.14 ± 0.04, a period of 12.438 ± 0.005 days, and a semimajor axis of 1.45 ± 0.08 × 104 km. The orbit reveals a surprisingly high-Quaoar-Weywot …
An All-Sky Atlas of Radio/X-ray Associations
Flesch, E.
An all-sky comprehensive catalogue of calculated radio and X-ray associations to optical objects is presented. Included are X-ray sources from XMM-Newton, Chandra and ROSAT catalogues, radio sources from NVSS, FIRST and SUMSS catalogues, and optical data, identifications and redshifts from the APM, USNO-A, SDSS-DR7 and the extant literature. This …
The Planetary Laboratory for Image Analysis (PLIA)
Sánchez-Lavega, A.; Rojas, J. F.; Pérez-Hoyos, S. +4 more
The observation, characterization, and understanding of planetary atmospheres are key components of Solar System exploration. Their study requires, among other observations, the use of image data acquired from spacecrafts. The basic tasks that are generally used to work with planetary image data are: image navigation, projection, image processing,…