Search Publications
Cassini CIRS update on stratospheric ices at Titan's winter pole
Achterberg, Richard K.; Smith, Michael D.; Samuelson, Robert E. +1 more
A strong, broad spectral emission feature at 85° N latitude centered at 221 cm -1 remains unidentified after candidate ices of H 2O and pure crystalline CH 3CH 2CN are unambiguously ruled out. A much shallower weak emission feature starts at 160 cm -1 and blends into the strong feature at ∼190…
An HI threshold for star cluster formation in tidal debris
Charlton, Jane C.; Maybhate, Aparna; English, Jayanne +4 more
Superstar clusters are young, compact star clusters found in the central regions of interacting galaxies. Recently, they have also been reported to preferentially form in certain tidal tails, but not in others. In this paper, we have used 21-cm HI maps and the Hubble Space Telescope Wide Field Planetary Camera 2 images of eight tidal tail regions …
IRAS 13197-1627 has them all: Compton-thin absorption, photoionized gas, thermal plasmas and a broad Fe line
Cappi, M.; Ponti, G.; Dadina, M. +2 more
We report results from the XMM-Newton observation of IRAS 13197-1627, a luminous infrared (IR) galaxy with a Seyfert 1.8 nucleus. The hard X-ray spectrum is steep (Γ ~ 2.5) and is absorbed by Compton-thin (NH ~ 4 × 1023 cm-2) neutral gas. We detect a Fe Kα emission line at 6.4 keV, consistent with transmission thro…
The stellar content of the XMM-Newton bright serendipitous survey
Braito, V.; Micela, G.; Favata, F. +5 more
Context: The comparison of observed counts in a given sky direction with predictions by Galactic models yields constraints on the spatial distribution and the stellar birthrate of young stellar populations. The XMM-Newton Bright Serendipitous Survey (XBSS) is an unbiased survey that includes a total of 58 stellar sources selected in the 0.5-4.5 ke…
Results from Droxo. I. The variability of fluorescent Fe 6.4 keV emission in the young star Elias 29. High-energy electrons in the star's accretion tubes?
Micela, G.; Favata, F.; Giardino, G. +3 more
Aims:We study the variability of the Fe 6.4 keV emission line from the Class I young stellar object Elias 29 in the ρ Oph cloud.
Methods: We analysed the data from Elias 29 collected by XMM-Newton during a nine-day, nearly continuous observation of the ρ Oph star-forming region (the Deep Rho-Oph X-ray Observation, named droxo). The data were s…
Comparative Study of the Initial Spikes of Soft Gamma-Ray Repeater Giant Flares in 1998 and 2004 Observed with Geotail: Do Magnetospheric Instabilities Trigger Large-Scale Fracturing of a Magnetar's Crust?
Kawai, N.; Tanaka, Y. T.; Yoshikawa, I. +5 more
We present the unsaturated peak profile of the giant flare from SGR 1900+14 on 1998 August 27. This was obtained by the particle counters of the Low Energy Particles instrument on board the Geotail spacecraft. The observed peak profile revealed four characteristic features: an initial steep rise, an intermediate rise to the peak, an exponential de…
Ultraviolet emission from young and middle-aged pulsars: Connecting X-rays with the optical
Kargaltsev, Oleg; Pavlov, George
We present the UV spectroscopy and timing of three nearby pulsars (Vela, B0656+14 and Geminga) recently observed with the Space Telescope Imaging Spectrograph. We also review the optical and X-ray properties of these pulsars and establish their connection with the UV properties. We show that the multiwavelengths properties of neutron stars (NSs) v…
Scattering of field-aligned beam ions upstream of Earth's bow shock
Klecker, B.; Lucek, E. A.; Rème, H. +3 more
Field-aligned beams are known to originate from the quasi-perpendicular side of the Earth's bow shock, while the diffuse ion population consists of accelerated ions at the quasi-parallel side of the bow shock. The two distinct ion populations show typical characteristics in their velocity space distributions. By using particle and magnetic field m…
The AGN Nature of 11 out of 12 Swift/RXTE Unidentified Sources through Optical and X-Ray Spectroscopy
Palazzi, E.; Minniti, D.; Masetti, N. +9 more
The Swift Burst Alert Telescope (BAT) is performing a high Galactic latitude survey in the 14-195 keV band at a flux limit of ~10-11 ergs cm-2 s-1, leading to the discovery of new high-energy sources, most of which have not yet been properly classified. A similar work has also been performed with the RXTE slew surv…
A photometric study of Be stars located in the seismology fields of COROT
Garrido, R.; Floquet, M.; Gutiérrez-Soto, J. +4 more
Context: In preparation for the COROT mission, an exhaustive photometric study of Be stars located in the seismology fields of the mission has been performed. The very precise and long-time-spanned photometric observations gathered by the COROT satellite will give important clues on the origin of the Be phenomenon.
Aims: The aim of this work i…