Search Publications
The Influence of Magnetic Field on Oscillations in the Solar Chromosphere
Mathioudakis, Mihalis; Bloomfield, D. Shaun; McAteer, R. T. James +1 more
Two sequences of solar images obtained by the Transition Region and Coronal Explorer in three UV passbands are studied using wavelet and Fourier analysis and compared to the photospheric magnetic flux measured by the Michelson Doppler Interferometer on the Solar Heliospheric Observatory to study wave behavior in differing magnetic environments. Wa…
Far-Infrared Excited Hydroxyl Lines from Orion KL Outflows
Cernicharo, José; Viti, Serena; Barlow, Michael J. +6 more
As part of the first far-IR line survey toward Orion KL, we present the detection of seven new rotationally excited OH Λ-doublets (at ~48, ~65, ~71, ~79, ~98, and ~115 µm). Observations were performed with the Long Wavelength Spectrometer Fabry-Pérot on board the Infrared Space Observatory. In total, more than 20 resolved OH rotational lines…
Discovery of a Candidate Central Compact Object in the Galactic Nonthermal SNR G330.2+1.0
Pavlov, George G.; Kargaltsev, Oleg; Hughes, John P. +5 more
We report on the discovery of a pointlike source (CXOU J160103.1-513353) at the center of the Galactic supernova remnant (SNR) G330.2+1.0 with Chandra X-Ray Observatory. The X-ray spectrum fits a blackbody model with kT~0.49 keV, implying a small emission region of R~0.4 km at the distance of 5 kpc. The estimated X-ray luminosity is LX~…
The XMM-Newton Examination of Energetics in the East Lobe of the Nearby Radio Galaxy Fornax A (NGC 1316)
Isobe, N.; Makishima, K.; Tashiro, M. +4 more
An XMM-Newton observation of the east radio lobe of the nearby radio galaxy Fornax A is reported. The diffuse hard X-ray emission associated with the east lobe, which was initially discovered by ASCA and ROSAT, is confirmed with significant signal statistics, after strictly removing 59 sources detected within the MOS field of view. Its X-ray spect…
INTEGRAL IBIS Census of the Sky Beyond 100 keV
Walter, R.; Bird, A. J.; Fiocchi, M. +8 more
We report on the first census of INTEGRAL IBIS detections (>~4 σ significance) above 100 keV based on the Core Program and public open-time observations up to 2005 April. There are 49 sources detected in the 100-150 keV band, of which 14 are also seen in the 150-300 keV range. The low-energy sample is dominated by X-ray binary systems of both l…
Unravelling Temporal Variability in Saturn's Spiral Density Waves: Results and Predictions
Nicholson, Philip D.; Porco, Carolyn C.; Hedman, Matthew M. +2 more
We describe a model that accounts for the complex morphology of spiral density waves raised in Saturn's rings by the co-orbital satellites, Janus and Epimetheus. Our model may be corroborated by future Cassini observations of these time-variable wave patterns.
Probing the Pulsar Wind Nebula of PSR B0355+54
Cropper, M.; McGowan, K. E.; Kennea, J. A. +3 more
We present XMM-Newton and Chandra X-ray observations of the middle-aged radio pulsar PSR B0355+54. Our X-ray observations reveal emission not only from the pulsar itself, but also from a compact diffuse component extending ~50" in the opposite direction to the pulsar's proper motion. There is also evidence for the presence of fainter diffuse emiss…
On the Lack of a Soft X-Ray Excess from Clusters of Galaxies
Bregman, Joel N.; Lloyd-Davies, Edward J.
A soft X-ray excess has been claimed to exist in and around a number of galaxy clusters, and this emission has been attributed to the warm-hot intergalactic medium that may constitute most of the baryons in the local universe. We have reexamined a study of the XMM-Newton observations on this topic by Kaastra and coworkers and find that the X-ray e…
Carbon Monoxide in Comet 9P/Tempel 1 before and after the Deep Impact Encounter
Weaver, Harold A.; Feldman, Paul D.; A'Hearn, Michael F. +4 more
One of the goals of the Hubble Space Telescope program to observe periodic comet 9P/Tempel 1 in conjunction with NASA's Deep Impact mission was to study the generation and evolution of the gaseous coma resulting from the impact. For this purpose, the Solar Blind Channel of the Advanced Camera for Surveys was used with the F140LP filter, which is s…
Solar Energetic Particles and Radio-silent Fast Coronal Mass Ejections
Klein, K. -L.; Posner, A.; Marqué, C.
Both solar flares and shock waves driven by fast coronal mass ejections (CMEs) can accelerate charged particles in the solar corona and create transient enhancements of solar energetic particle fluxes in interplanetary space (SEP events). Fast CMEs and flares often occur together, which makes it difficult to directly identify the actual source of …