Search Publications
Probing the unified model in NGC 7314
Kaastra, J. S.; Costantini, E.; Ebrero, J. +2 more
Aims: We aim at studying the complex absorbed X-ray spectrum of the Narrow Line Seyfert 1 galaxy NGC 7314.
Methods: We collected available public X-ray data from the archives of XMM-Newton, Suzaku, and ASCA. The spectra were analyzed using the fitting package SPEX.
Results: We find evidence of intrinsic neutral and ionized absorptio…
Model for Cameron-band emission in comets: a case for the EPOXI mission target comet 103P/Hartley 2
Bhardwaj, Anil; Raghuram, Susarla
The CO2 production rate has been derived in comets using Cameron-band (a3Π→X1Σ) emission of CO molecules, assuming that photodissociative excitation of CO2 is the main production mechanism of CO in the a3Π metastable state. We have developed a model for the production and loss of CO(a3
Supersonic Downflows at the Umbra-Penumbra Boundary of Sunspots
Venkatakrishnan, P.; Mathew, Shibu K.; Louis, Rohan E. +1 more
High-resolution spectropolarimetric observations of three sunspots taken with Hinode demonstrate the existence of supersonic downflows at or close to the umbra-penumbra boundary which have not been reported before. These downflows are confined to large patches, usually encompassing bright penumbral filaments, and have lifetimes of more than 14 hr.…
Further Sunyaev-Zel'dovich observations of two Planck ERCSC clusters with the Arcminute Microkelvin Imager
AMI Consortium; Olamaie, Malak; Davies, Matthew L. +16 more
We present follow-up observations of two galaxy clusters detected blindly via the Sunyaev-Zel'dovich (SZ) effect and released in the Planck Early Release Compact Source Catalogue. We use the Arcminute Microkelvin Imager, a dual-array 14-18 GHz radio interferometer. After radio source subtraction, we find a SZ decrement of integrated flux density -…
Detection of X-Ray Emission from the Unidentified TeV Gamma-Ray Source TeV J2032+4130
Kitamoto, Shunji; Murakami, Hiroshi; Nakamori, Takeshi +1 more
We observed the first unidentified TeV
Magnetic helicity balance during a filament eruption that occurred in active region NOAA 9682
Poedts, S.; Romano, P.; Zuccarello, F. P. +1 more
Context. Photospheric shear plasma flows in active regions may be responsible for the magnetic helicity injection in the solar corona not only during the energy storage process before a solar eruption, but also during and after the release of the free magnetic energy caused by the eruption. Indeed, after a filament eruption or expansion the magnet…
Preservation of Late Amazonian Mars ice and water-related deposits in a unique crater environment in Noachis Terra: Age relationships between lobate debris tongues and gullies
Head, James W.; Marchant, David R.; Morgan, Gareth A.
The Amazonian period of Mars has been described as static, cold, and dry. Recent analysis of high-resolution imagery of equatorial and mid-latitude regions has revealed an array of young landforms produced in association with ice and liquid water; because near-surface ice in these regions is currently unstable, these ice-and-water-related landform…
4U 1909+07: a well-hidden pearl
Wilms, J.; Pottschmidt, K.; Fürst, F. +4 more
We present the first detailed spectral and timing analysis of the high mass X-ray binary (HMXB) 4U 1909+07 with INTEGRAL and RXTE. 4U 1909+07 is detected in the ISGRI 20-40 keV energy band with an average countrate of 2.6 cts s-1. The pulse period of ~604 s is not stable, but changing erratically on timescales of years. The pulse profil…
On Titan's Xanadu region
Barnes, Jason W.; Brown, Robert H.; Melosh, H. Jay
A large, circular marking ∼1800 km across is seen in near-infrared images of Titan. The feature is centered at 10°S, 120°W on Titan, encompasses much of Titan's western Xanadu region, and has an off-center, quasi-circular, inner margin about 700 km across, with lobate outer margins extending 200-500 km from the inner margin. On the feature's south…
Actors of the main activity in large complex centres during the 23 solar cycle maximum
Mandrini, C. H.; Schmieder, B.; Molodij, G. +10 more
During the maximum of Solar Cycle 23, large active regions had a long life, spanning several solar rotations, and produced large numbers of X-class flares and CMEs, some of them associated to magnetic clouds (MCs). This is the case for the Halloween active regions in 2003. The most geoeffective MC of the cycle (Dst = -457) had its source during th…