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XMM-Newton view of a hard X-ray transient IGR J17497-2821
Dewangan, Gulab C.; Alam, Md. Shah; Mukherjee, Dipanjan +3 more
We present spectral and energy-dependent timing characteristics of the hard X-ray transient IGR J17497-2821 based on XMM-Newton observations performed five and nine days after its outburst on 2006 September 17. We find that the source spectra can be well described by a hard (Γ ∼ 1.50) power law and a weak multicolour disc blackbody with inner disc…
Influence of the lunar ambience on dynamic surface hydration on sunlit regions of the Moon
Califorrniaa, E.
The accepted paradigm of a dry Moon has been upset by the recent detection of a wet Moon. EPOXI, NASA's extended mission for the Deep Impact spacecraft, observed and quantified dynamic surface hydration on sunlit regions of the Moon by infrared spectrometry in separate flybys. MIP CHACE, released from ISRO's Chandrayaan-1 spacecraft, detected H
Propagating disturbances along a coronal loop from simultaneous EUV imaging and spectroscopic observations
Krishna Prasad, S.; Banerjee, Dipankar; Datta, Ajanta
Propagating disturbances (PDs) were studied along an active region loop using simultaneous imaging and spectroscopy. An image sequence recorded in the Fe IX/Fe X 171Å channel, from TRACE and spectral data in the Si XII 520.6 Å line obtained from CDS/SOHO, are analyzed. A space-time map constructed from the TRACE image sequence shows the presence o…
New temperature and pressure retrieval algorithm for high-resolution infrared solar occultation spectroscopy: analysis and validation against ACE-FTS and COSMIC
Olsen, K. S.; Toon, G. C.; Boone, C. D. +1 more
Motivated by the initial selection of a high-resolution solar occultation Fourier transform spectrometer (FTS) to fly to Mars on the ExoMars Trace Gas Orbiter, we have been developing algorithms for retrieving volume mixing ratio vertical profiles of trace gases, the primary component of which is a new algorithm and software for retrieving vertica…
Comparison of measured and calculated magnetic fields along the Ulysses orbit
Bazilevskaya, G. A.; Svirzhevsky, N. S.; Svirzhevskaya, A. K. +1 more
The existence of close relations between the temperature, density and velocity of the solar plasma and the heliospheric magnetic field (HMF) was shown along the space probe Ulysses orbit. A simple mathematical formula describing a relation between the HMF and the solar plasma temperature and density was introduced and the expected values of the HM…
Study of the star catalogue (epoch AD 1396.0) recorded in ancient Korean astronomical almanac
Jeon, Junhyeok; Lee, Yong Bok; Lee, Yong-Sam
The study of old star catalogues provides important astrometric data. Most of the researches based on the old star catalogues were manuscript published in Europe and from Arabic/Islam. However, the old star catalogues published in East Asia did not get attention. Therefore, among the East Asian star catalogues we focus on a particular catalogue re…
Properties of craters on the Achaia region of Asteroid (21) Lutetia
Jorda, L.; Lamy, P. L.; Groussin, O. +3 more
We report on the physical properties of the craters of Achaia region of the main-belt Asteroid (21) Lutetia, based on images obtained with the OSIRIS instrument during the Rosetta flyby that took place on 10 July 2010. Images of the surface were acquired with its Narrow Angle Camera, from which Digital Terrain Models (DTM) of the surface were cons…
Herschel-HIFI observations of H2O, NH3, and N2H+ toward high-mass starless and protostellar clumps identified by the Hi-GAL survey⋆
Codella, C.; Persson, C. M.; Olmi, L.
Context. Our present understanding of high-mass star formation still remains very schematic. In particular, it is not yet clear how much of the difference between low-mass and high-mass star formation occurs during the earliest star formation phases.
Aims: The chemical characteristics of massive cold clumps, and the comparison with those of t…
On the resolution of the phase space density required to obtain a specified accuracy of the solar wind bulk velocity
Podesta, John J.
Plasma measurements with significantly improved accuracy and time resolution are needed to advance knowledge and understanding of plasma physical process in the magnetosphere and the solar wind. In this study, it is shown how small unresolved features in particle distribution functions can have significant impacts on the measurement of plasma bulk…
An XMM-Newton view of FeKα in High Mass X-rays Binaries
Eikmann, W.; Oskinova, L. M.; Torrejón, J. M. +4 more
We present a comprehensive analysis of the whole sample of available XMM-Newton observations of High Mass X-ray Binaries (HMXBs) until August, 2013, focusing on the FeKα emission line. This line is a key tool to better understand the physical properties of the material surrounding the X-ray source within a few stellar radii (the circumstellar medi…