Search Publications
Diurnal observations of HCl altitude variation in the 70-100 km mesosphere of Venus
Todd Clancy, R.; Sandor, Brad J.
First submm spectroscopic observations of the 625.9 GHz H35Cl absorption lines of the Venus dayside atmosphere were obtained with the James Clerk Maxwell Telescope (JCMT) on March 2, 2013. These data, which support retrieval of HCl altitude distributions in the Venus mesosphere (70-100 km), are presented here and compared with previousl…
Chandra X-ray observations of the hyper-luminous infrared galaxy IRAS F15307+3252
Iwasawa, K.; Fabian, A. C.; Gandhi, P. +6 more
Hyper-luminous infrared galaxies (HyLIRGs) lie at the extreme luminosity end of the IR galaxy population with LIR > 1013 L⊙. They are thought to be closer counterparts of the more distant sub-millimeter galaxies, and should therefore be optimal targets to study the most massive systems in formation. We present d…
Surface thermophysical properties on the potentially hazardous asteroid (99942) Apophis
Ip, Wing-Huen; Yu, Liang-Liang; Ji, Jianghui
We investigate the surface thermophysical properties (thermal emissivity, thermal inertia, roughness fraction and geometric albedo) of asteroid (99942) Apophis, using the currently available mid-infrared observations from CanariCam on Gran Telescopio CANARIAS and far-infrared data from PACS on Herschel, based on the Advanced Thermophysical Model. …
Testing for Shock-heated X-Ray Gas around Compact Steep Spectrum Radio Galaxies
Worrall, D. M.; O'Dea, C. P.; Clarke, T. E. +7 more
We present Chandra and XMM-Newton X-ray, Very Large Array (VLA) radio, and optical observations of three candidate compact steep spectrum (CSS) radio galaxies. CSS sources are of a galactic scale and are presumably driving a shock through the interstellar medium (ISM) of their host galaxy. B3 1445+410 is a low-excitation emission line CSS radio ga…
Spectral Evidence for an Inner Carbon-rich Circumstellar Belt in the Young HD 36546 A-star System
Melis, C.; Sitko, M. L.; Marengo, M. +5 more
Using the NASA/IRTF SpeX and BASS spectrometers we have obtained 0.7-13 µm observations of the newly imaged 3-10 Myr old HD 36546 disk system. The SpeX spectrum is most consistent with the photospheric emission expected from an L * ∼ 20 L ⊙, solar abundance A1.5V star with little to no extinction, and excess emission fr…
Clastic patterned ground in Lomonosov crater, Mars: examining fracture controlled formation mechanisms
Balme, Matthew R.; Patel, Manish R.; Hagermann, Axel +1 more
The area surrounding Lomonosov crater on Mars has a high density of seemingly organised boulder patterns. These form seemingly sorted polygons and stripes within kilometre scale blockfields, patches of boulder strewn ground which are common across the Martian high latitudes. Several hypotheses have been suggested to explain the formation of clasti…
Observations of Cygnus X-1 in the MeV band by the INTEGRAL imager
Walter, R.; Xu, M.
Context. The spectrum of the MeV tail detected in the black-hole candidate Cygnus X-1 remains controversial as it appeared much harder when observed with the INTEGRAL Imager IBIS than with the INTEGRAL spectrometer SPI or CGRO.
Aims: We present an independent analysis of the spectra of Cygnus X-1 observed by IBIS in the hard and soft states. …
Development and Parameters of a Non-Self-Similar CME Caused by the Eruption of a Quiescent Prominence
Grechnev, V. V.; Kuzmenko, I. V.
The eruption of a large quiescent prominence on 17 August 2013 and an associated coronal mass ejection (CME) were observed from different vantage points by the Solar Dynamics Observatory (SDO), the Solar-Terrestrial Relations Observatory (STEREO), and the Solar and Heliospheric Observatory (SOHO). Screening of the quiet Sun by the prominence produ…
On the lensed blazar B0218+357
Falomo, R.; Treves, A.; Scarpa, R. +2 more
We present an optical spectrum (λλ4000-10 500) of the lensed blazar B0218+357 secured at the 10 m GTC and aimed to investigate and clarify the properties of this intriguing system. We found that the emission line spectrum of the blazar is characterized by only one broad emission line that interpreted as Mg II 2800 Å yields z = 0.95. In addition, w…
Anomalous Surge of the White-Light Corona at the Onset of the Declining Phase of Solar Cycle 24
Lamy, P.; Vibert, D.; Wojak, J. +1 more
In late 2014, when the current Solar Cycle 24 entered its declining phase, the white-light corona as observed by the LASCO-C2 coronagraph underwent an unexpected surge that increased its global radiance by 60%, reaching a peak value comparable to the peak values of the more active Solar Cycle 23. A comparison of the temporal variation of the white…