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Precipitation of highly energetic protons by helium branch electromagnetic ion cyclotron triggered emissions
Omura, Yoshiharu; Shoji, Masafumi
In the equatorial region of the Earth's inner magnetosphere, the electromagnetic ion cyclotron (EMIC) triggered emissions are generated through interaction with energetic protons. We investigate the generation process of the EMIC triggered emissions in the He+branch and associated precipitation of the energetic protons using a one-dimen…
Global mapping of Titan‧s surface using an empirical processing method for the atmospheric and photometric correction of Cassini/VIMS images
Nicholson, Philip D.; Sotin, Christophe; Barnes, Jason W. +8 more
We have processed all images of Titan's surface acquired by the Visual and Infrared Mapping Spectrometer between 2004 and 2010, with the objective of producing seamless global mosaics of the surface in the six infrared atmospheric windows at 1.08, 1.27, 1.59, 2.03, 2.6-2.7 and 5 µm. A systematic study of the photometry at 5 µm, where h…
Variable stars in the Cetus dwarf spheroidal galaxy: population gradients and connections with the star formation history
Stetson, P. B.; Bono, G.; Fiorentino, G. +7 more
We investigate the variable star content of the isolated, Local Group, dwarf spheroidal (dSph) galaxy Cetus. Multi-epoch, wide-field images collected with the Very Large Telescope/Visible Multiobject Spectrograph camera allowed us to detect 638 variable stars (630 RR Lyrae stars and eight anomalous Cepheids), 475 of which are new detections. We pr…
Sub-millimetre spectroscopy of Saturn's trace gases from Herschel/SPIRE
Fletcher, L. N.; Hartogh, P.; Lellouch, E. +15 more
Aims: We provide an extensive new sub-millimetre survey of the trace gas composition of Saturn's atmosphere using the broad spectral range (15-51 cm-1) and high spectral resolution (0.048 cm-1) offered by Fourier transform spectroscopy by the Herschel/SPIRE instrument (Spectral and Photometric Imaging REceiver). Observat…
Testing Nonstandard Cosmological Models with SNLS3 Supernova Data and Other Cosmological Probes
Li, Zhengxiang; Wu, Puxun; Yu, Hongwei
We investigate the implications for some nonstandard cosmological models using data from the first three years of the Supernova Legacy Survey (SNLS3), assuming a spatially flat universe. A comparison between the constraints from the SNLS3 and those from other SN Ia samples, such as the ESSENCE, Union2, SDSS-II, and Constitution samples, is given a…
A New Method to Constrain Supernova Fractions Using X-Ray Observations of Clusters of Galaxies
Bulbul, Esra; Loewenstein, Michael; Smith, Randall K.
Supernova (SN) explosions enrich the intracluster medium (ICM) both by creating and dispersing metals. We introduce a method to measure the number of SNe and relative contribution of Type Ia supernovae (SNe Ia) and core-collapse supernovae (SNe cc) by directly fitting X-ray spectral observations. The method has been implemented as an XSPEC model c…
The Clustered Nature of Star Formation. Pre-main-sequence Clusters in the Star-forming Region NGC 602/N90 in the Small Magellanic Cloud
Gouliermis, Dimitrios A.; Gennaro, Mario; Dolphin, Andrew E. +3 more
Located at the tip of the wing of the Small Magellanic Cloud (SMC), the star-forming region NGC 602/N90 is characterized by the H II nebular ring N90 and the young cluster of pre-main-sequence (PMS) and early-type main-sequence stars NGC 602, located in the central area of the ring. We present a thorough cluster analysis of the stellar sample iden…
Post-Coronal Mass Ejection Plasma Observed by Hinode
Raymond, J. C.; Landi, E.; Hara, H. +1 more
In the present work we study the evolution of an active region after the eruption of a coronal mass ejection (CME) using observations from the EIS and XRT instruments on board Hinode. The field of view includes a post-eruption arcade, a current sheet, and a coronal dimming. The goal of this paper is to provide a comprehensive set of measurements f…
Searching for X-ray emission from AGB stars
Montez, R.; Kastner, J.; Ramstedt, S. +1 more
Context. Magnetic fields have been measured around asymptotic giant branch (AGB) stars of all chemical types using maser polarization observations. If present, a large-scale magnetic field would lead to X-ray emission, which should be observable using current X-ray observatories.
Aims: The aim is to search the archival data for AGB stars that…
X-ray colour-colour selection for heavily absorbed active galactic nuclei
Nandra, Kirpal; Brightman, Murray
We present a method for the identification of heavily absorbed active galactic nuclei (AGN) (NH > 1023 cm-2) from X-ray photometric data. We do this using a set of XMM-Newton reference spectra of local galaxies for which we have accurate NH information, as described in Brightman & Nandra. The tech…