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Distances of the bulge globular clusters Terzan 5, Liller 1, UKS 1, and Terzan 4 based on HST NICMOS photometry
Zoccali, M.; Bica, E.; Barbuy, B. +2 more
Context: A large number of pulsars and X-rays sources are detected in globular clusters. To understand the structure and content of these clusters, accurate distances are required.
Aims: We derive the distances of Terzan 5, Liller 1 and UKS 1 using as a reference a recent distance determination of NGC 6528, based on HST/NICMOS and NTT/SOFI inf…
Physical parameters of 15 intermediate-age LMC clusters from modelling of HST colour-magnitude diagrams
Santiago, B. X.; Brocato, E.; Kerber, L. O.
Aims:We analyzed HST/WFPC2 colour-magnitude diagrams (CMDs) of 15 populous Large Magellanic Cloud (LMC) stellar clusters with ages between ~0.3 Gyr and ~3 Gyr. These (V, B-V) CMDs are photometrically homogeneous and typically reach V ∼ 22. Accurate and self-consistent physical parameters (age, metallicity, distance modulus and reddening) were extr…
The WEBT Campaign on the Blazar 3C 279 in 2006
Lee, C. -U.; Nishiyama, S.; Mirabal, N. +77 more
The quasar 3C 279 was the target of an extensive multiwavelength monitoring campaign from 2006 January through April. An optical-IR-radio monitoring campaign by the Whole Earth Blazar Telescope (WEBT) collaboration was organized around target-of-opportunity X-ray and soft γ-ray observations with Chandra and INTEGRAL in 2006 mid-January, with addit…
Coronal Dimming Observed with Hinode: Outflows Related to a Coronal Mass Ejection
Harra, Louise K.; Hara, Hirohisa; Young, Peter R. +5 more
Coronal dimming has been a signature used to determine the source of plasma that forms part of a coronal mass ejection (CME) for many years. Generally dimming is detected through imaging instruments such as SOHO EIT by taking difference images. Hinode tracked active region 10930 from which there were a series of flares. We combined dimming observa…
Characterising Saturn's vertical temperature structure from Cassini/CIRS
Fletcher, L. N.; Irwin, P. G. J.; Teanby, N. A. +7 more
Thermal infrared spectra of Saturn from 10-1400 cm -1 at 15 cm -1 spectral resolution and a spatial resolution of 1°-2° latitude have been obtained by the Cassini Composite Infrared Spectrometer [Flasar, F.M., and 44 colleagues, 2004. Space Sci. Rev. 115, 169-297]. Many thousands of spectra, acquired over eighteen-months of o…
Mode Conversion and Anomalous Transport in Kelvin-Helmholtz Vortices and Kinetic Alfvén Waves at the Earth's Magnetopause
Acuna, M.; Fujimoto, M.; Reme, H. +5 more
Observations at the Earth’s magnetopause identify mode conversion from surface to kinetic Alfvén waves at the Alfvén resonance. Kinetic Alfvén waves radiate into the magnetosphere from the resonance with parallel scales up to the order of the geomagnetic field-line length and spectral energy densities obeying a k⊥-2.4 power l…
A Bar Fuels a Supermassive Black Hole?: Host Galaxies of Narrow-Line Seyfert 1 Galaxies
Ohta, Kouji; Kawaguchi, Toshihiro; Aoki, Kentaro +1 more
We present optical images of nearby 50 narrow-line Seyfert 1 galaxies (NLS1s) that cover all the NLS1s at z<0.0666 and δ>=-25deg known in 2001. Among the 50 NLS1s, 40 images are newly obtained by our observations and 10 images are taken from archive data. Motivated by the hypothesis that NLS1s are in an early phase of a supermassi…
Ring current at Saturn: Energetic particle pressure in Saturn's equatorial magnetosphere measured with Cassini/MIMI
Krupp, N.; Krimigis, S. M.; Mitchell, D. G. +5 more
The Magnetospheric Imaging Instrument (MIMI) on the Cassini spacecraft provides measurements of the energetic ion population within the magnetosphere of Saturn. Energetic ion directional intensities, energy spectra and ion composition, are measured by the Charge Energy Mass Spectrometer (CHEMS) over the range ~3 to 236 keV per charge and by the Lo…
Discovery of Pulsations and a Possible Spectral Feature in the X-Ray Emission from Rotating Radio Transient J1819-1458
Camilo, F.; Rea, N.; Chatterjee, S. +7 more
PSR J1819-1458 is a rotating radio transient (RRAT) source with an inferred surface dipole magnetic field strength of 5×1013 G and a 4.26 s spin period. We present XMM-Newton observations of the X-ray counterpart of this source, CXOU J181939.1-145804, in which we identify pulsations and a possible spectral feature. The X-ray pulsations …
On magnetospheric electron impact ionisation and dynamics in Titan's ram-side and polar ionosphere - a Cassini case study
Lewis, G. R.; Coates, A. J.; Dougherty, M. K. +13 more
We present data from the sixth Cassini flyby of Titan (T5), showing that the magnetosphere of Saturn strongly interacts with the moon's ionosphere and exo-ionosphere. A simple electron ionisation model provides a reasonable agreement with the altitude structure of the ionosphere. Furthermore, we suggest that the dense and cold exo-ionosphere (from…