Search Publications
The temperature of the Venus mesosphere from O 2 ( aΔg1) airglow observations
Bailey, Jeremy; Crisp, D.; Chamberlain, S. +1 more
We have used near-infrared spectroscopic observations of the Venus nightside taken with the Infrared Imager and Spectrograph 2 (IRIS2) on the Anglo-Australian Telescope to derive temperature maps for the Venus mesosphere at an altitude of ∼95 km. The temperatures are derived from the distribution of rotational line intensities in the O 2
Injection and Interplanetary Transport of Near-Relativistic Electrons: Modeling the Impulsive Event on 2000 May 1
Lario, D.; Vainio, R.; Sanahuja, B. +1 more
We present a Monte Carlo method to model the transport of solar near-relativistic electrons in the interplanetary medium, including adiabatic focusing, pitch-angle dependent scattering, and solar wind effects. By taking into account the angular response of the LEFS60 telescope of the EPAM instrument on board the ACE spacecraft, we transform the si…
Multifrequency VLA observations of the FR I radio galaxy 3C 31: morphology, spectrum and magnetic field
Giovannini, G.; Parma, P.; Laing, R. A. +4 more
We present high-quality Very Large Array (VLA) images of the Fanaroff-Riley Class I (FRI) radio galaxy 3C31 in the frequency range 1365-8440MHz with angular resolutions from 0.25 to 40 arcsec. Our new images reveal complex, well resolved filamentary substructure in the radio jets and tails. We also use these images to explore the spectral structur…
Probing the Radio to X-Ray Connection of the Vela X Pulsar Wind Nebula with Fermi LAT and H.E.S.S.
LaMassa, S.; de Jager, O. C.; Slane, P. O.
Morphologically, it appears as if the Vela X pulsar wind nebula (PWN) consists of two emission regions: whereas X-ray (~1 keV) and very high energy (VHE) H.E.S.S. γ-ray observations appear to define a cocoon-type shape south of the pulsar, radio observations reveal an extended area of size 2° × 3° (including the cocoon area), also south of the Vel…
A multi-instrument view of tail reconnection at Saturn
Coates, A. J.; Krupp, N.; Russell, C. T. +8 more
Three instances of tail reconnection events at Saturn involving the ejection of plasmoids downtail have been reported by Jackman et al. (2007) using data from Cassini's magnetometer (MAG). Here we show two newly discovered events, as identified in the MAG data by northward/southward turnings and intensifications of the field. We discuss these even…
Optical Counterpart of the Ultraluminous X-Ray Source IC 342 X-1
Feng, Hua; Kaaret, Philip
We present Chandra and HST observations of the ultraluminous X-ray source (ULX) IC 342 X-1. The Chandra and HST images are aligned using two X-ray-emitting foreground stars. The astrometry-corrected position for X-1 is R .A . = 03h45m55.61s, decl . = + 68°04'55.3'' (J2000.0), with an error circle of 0.2''. One exte…
MOND plus classical neutrinos are not enough for cluster lensing
Natarajan, Priyamvada; Zhao, Hongsheng
Clusters of galaxies offer a robust test bed for probing the nature of dark matter that is insensitive to the assumption of the gravity theories. Both Modified Newtonian Dynamics (MOND) and General Relativity (GR) would require similar amounts of non-baryonic matter in clusters as MOND boosts the gravity only mildly on cluster scales. Gravitationa…
Low-Ionization Emission Regions in Quasars: Gas Properties Probed with Broad O I and Ca II Lines
Kawara, K.; Oyabu, S.; Matsuoka, Y.
We have compiled the emission-line fluxes of O I λ8446, O I λ11287, and the near-infrared (IR) Ca II triplet (λ8579) observed in 11 quasars. These lines are considered to emerge from the same gas as do the Fe II lines in the low-ionized portion of the broad emission line region (BELR). The compiled quasars are distributed over wide ranges of redsh…
New XMM-Newton observations of supernova remnants in the Small Magellanic Cloud
Pietsch, W.; Haberl, F.; Filipović, M. D. +6 more
Context: A complete overview of the supernova remnant (SNR) population is required to investigate their evolution and interaction with the surrounding interstellar medium in the Small Magellanic Cloud (SMC).
Aims: Recent XMM-Newton observations of the SMC cover three known SNRs (DEM S5, SNR B0050-72.8, and SNR B0058-71.8), which are poorly stu…
Cooperative Observation of Ellerman Bombs between the Solar Optical Telescope aboard Hinode and Hida/Domeless Solar Telescope
Matsumoto, Takuma; Shibata, Kazunari; Tsuneta, Saku +13 more
High-resolution CaIIH broad-band filter images of NOAA10933 on 2007 January 5 were obtained by the Solar Optical Telescope aboard the Hinode satellite. Many small-scale (∼1") bright points were observed outside the sunspot and inside the emerging flux region. We identified some of these bright points with Ellerman bombs (EBs) by using Hα images ta…