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Lifetimes and Oscillator Strengths for Ultraviolet Transitions in Singly Ionized Lead
Federman, S. R.; Ritchey, A. M.; Irving, R. E. +5 more
We present the results of lifetime measurements made using beam-foil techniques on levels of astrophysical interest in Pb ii producing lines at 1203.6 Å (6s6p2 {}2{D}3/2) and 1433.9 Å (6{s}26d {}2{D}3/2). We also report the first detection of the Pb ii λ 1203 line in the interstella…
The XMM deep survey in the CDF-S. VIII. X-ray properties of the two brightest sources
Brandt, W. N.; Vignali, C.; Gilli, R. +7 more
We present results from the deep XMM-Newton observations of the two brightest X-ray sources in the Chandra Deep Field South (CDFS), PID 203 (z = 0.544) and PID 319 (z = 0.742). The long exposure of 2.5 Ms over a 10 year period (net 4 yr with a 6 yr gap) makes it possible to obtain high quality X-ray spectra of these two Type I AGN with X-ray lumin…
Broad-band X-ray spectra of anomalous X-ray pulsars and soft γ-ray repeaters: pulsars in a weak-accretion regime?
Zezas, A.; Trümper, J. E.; Kylafis, N. D.
We present the results from the analysis of the broad-band X-ray spectra of five anomalous X-ray pulsars (AXPs) and soft γ-ray repeaters (SGRs). We fit their Suzaku and INTEGRAL spectra with models appropriate for the X-ray emission from the accretion flow on to a pulsar. We find that their X-ray spectra can be well described with this model. In p…
The Bottom-light Present Day Mass Function of the Peculiar Globular Cluster NGC 6535
Zaritsky, Dennis; Halford, Melissa
Dynamical mass calculations have suggested that the Milky Way globular cluster NGC 6535 belongs to a population of clusters with high mass-to-light ratios, possibly due to a bottom-heavy stellar initial mass function (IMF). We use published Hubble Space Telescope data to measure the present day stellar mass function of this cluster within its half…
Photochemical response to the variation of temperature in the 2011-2012 stratospheric vortex of Saturn
Fletcher, L. N.; Hartogh, P.; Hue, V. +4 more
Context. A hot vortex formed in the stratosphere of Saturn following the 2010-2011 Northern Storm. Huge temperature increases have been measured in the vortex around the millibar level. Enhancements in hydrocarbon abundances have been observed at the millibar level in 2011-2012 inside this vortex.
Aims: We model the time-dependent photochemis…
Degradation assessment of LYRA after 5 years on orbit - Technology Demonstration -
Gissot, S.; Schühle, U.; Saito, T. +10 more
We present a long-term assessment of the radiometric calibration and degradation of the Large Yield Radiometer (LYRA), which has been on orbit since 2009. LYRA is an ultraviolet (UV) solar radiometer and is the first space experiment using aboard a pioneering diamond detector technology. We show that LYRA has degraded after the commissioning phase…
Oxygen emission in remnants of thermonuclear supernovae as a probe for their progenitor system
Kaastra, J. S.; Kosenko, D.; Blinnikov, S. I. +3 more
Recent progress in numerical simulations of thermonuclear supernova explosions brings up a unique opportunity in studying the progenitors of Type Ia supernovae. Coupling state-of-the-art explosion models with detailed hydrodynamical simulations of the supernova remnant evolution and the most up-to-date atomic data for X-ray emission calculations m…
Discovery of suprathermal Fe+ in Saturn's magnetosphere
Krimigis, S. M.; Mitchell, D. G.; Hamilton, D. C. +3 more
Measurements in Saturn's equatorial magnetosphere from mid-2004 through 2013 made by Cassini's charge-energy-mass ion spectrometer indicate the presence of a rare, suprathermal (83-167 keV/e) ion species at Saturn with mass ~56 amu that is likely Fe+. The abundance of Fe+ is only ~10-4 relative to that of W+
Is HE 0436-4717 Anemic? A deep look at a bare Seyfert 1 galaxy
Gallo, L. C.; Vasudevan, R.; Bonson, K.
A multi-epoch, multi-instrument analysis of the Seyfert 1 galaxy HE 0436-4717 is conducted using optical to X-ray data from XMM-Newton and Swift (including the Burst Alert Telescope). Fitting of the UV-to-X-ray spectral energy distribution shows little evidence of extinction and the X-ray spectral analysis does not confirm previous reports of deep…
Reduced Coronal Emission Above Large Isolated Sunspots
Gary, D. E.; Shibasaki, K.; Peterova, N. G. +2 more
We analysed specific regions of reduced soft X-ray and microwave emission in five large isolated sunspots. The Nobeyama Radioheliograph 17 GHz observations reveal a local depression of microwave brightness in the peripheral area of the sunspots. The depression regions appear light (weak absorption) in the He 10830 Å line in areas with extended (op…