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Solar Radio Spikes in 2.6 - 3.8 GHz during the 13 December 2006 Event
Zhang, Y.; Yan, Y. H.; Liu, Y. Y. +3 more
On 13 December 2006, some unusual radio bursts in the range 2.6 - 3.8 GHz were observed during an X3.4 flare/CME event from 02:30 to 04:30 UT in active region NOAA 10930 (S06W27) with the digital spectrometers of the National Astronomical Observatories of China (NAOC). During this event many spikes were detected with the high temporal resolution o…
The EBIT Calorimeter Spectrometer: A New, Permanent User Facility at the LLNL EBIT
Kilbourne, C. A.; Porter, F. S.; Kelley, R. L. +8 more
The EBIT Calorimeter Spectrometer (ECS) is currently being completed and will be installed at the EBIT facility at the Lawrence Livermore National Laboratory in October 2007. The ECS will replace the smaller XRS/EBIT microcalorimeter spectrometer that has been in almost continuous operation since 2000. The XRS/EBIT was based on a spare laboratory …
Gemini Spectroscopy and HST Imaging of the Stellar Cluster Population in Region B of M82
Bastian, N.; Smith, L. J.; Gallagher, J. S., III +3 more
We present new spectroscopic observations of the stellar cluster population of region B in the prototype starburst galaxy M82 obtained with the Gemini North 8.1 m telescope. By coupling the spectroscopy with UBVI photometry acquired with the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope (HST), we derive ages, extinctions, and rad…
Morphology of galaxies in the Coma cluster region down to M_B = -14.25. I. A catalog of 473 members
Andreon, S.; Michard, R.
This paper presents morphological type, membership, and U{-}V color for a sample of galaxies in the Coma cluster direction, complete down to M_B=-15.00 mag and extending down to M_B=-14.25 mag. We have examined 1155 objects from the GMP 1983 catalog on B and V images of the CFH12K camera, and obtained the Hubble type in most cases. Coma cluster me…
Peering through the stellar wind of IGR J19140+0951 with simultaneous INTEGRAL/RXTE observations
Rodriguez, J.; Shaw, S. E.; Hannikainen, D. C. +1 more
We have used the RXTE and INTEGRAL satellites simultaneously to observe the high-mass X-ray binary (HMXB) IGR J19140+0951. The spectra obtained in the 3-80 keV range have allowed us to perform a precise spectral analysis of the system along its binary orbit. The spectral evolution confirms the supergiant nature of the companion star and the neutro…
The Planetary Nebula NGC 1360: A Test Case of Magnetic Collimation and Evolution after the Fast Wind
López, J. A.; Steffen, W.; García-Segura, G. +2 more
The central star of this nebula has an observed intense magnetic field and the fast wind is no longer present, indicating that a back flow process has probably developed. Long-slit, spatially resolved echelle spectra have been obtained across the main body of NGC 1360 and over its system of bipolar jets. Deep images of the knotty structures of the…
NGC 300 X-1 and IC 10 X-1: a new breed of black hole binary?
Barnard, R.; Clark, J. S.; Kolb, U. C.
Context: IC 10 X-1 has recently been confirmed as a black hole (BH) + Wolf-Rayet (WR) X-ray binary, and NGC 300 X-1 is thought to be. The only other known BH+WR candidate is Cygnus X-3. IC 10 X-1 and NGC 300 X-1 have similar X-ray properties, with 0.3-10 keV luminosities ~1038 erg s-1, and their X-ray lightcurves exhibit orbi…
Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shock
Coates, A. J.; Dougherty, M. K.; Thomsen, M. F. +7 more
The first observations of the kronian equivalent of hot flow anomalies (HFAs) are presented. Using magnetic field and plasma data we discuss two events that were observed upstream of Saturn's bow shock during the first two orbits of the Cassini spacecraft. We suggest that these events result from the interaction between interplanetary current shee…
X-ray absorption in distant type II QSOs
Barcons, X.; Carrera, F. J.; Watson, M. G. +7 more
Aims: We present the results of the X-ray spectral analysis of an XMM-Newton-selected type II QSO sample with z ≥ 0.5 and 0.5-10 keV flux of 0.3-33×10-14 erg/s/cm^2. The distribution of absorbing column densities in type II QSOs is investigated and the dependence of absorption on X-ray luminosity and redshift is studied.
Methods: We…
High-resolution polarimetry of Parsamian 21: revealing the structure of an edge-on FUOri disc
Apai, D.; Ábrahám, P.; Kóspál, Á. +6 more
We present the first high spatial resolution near-infrared direct and polarimetric observations of Parsamian 21, obtained with the Nasmyth Adaptive Optics System-CONICA instrument at the Very Large Telescope (VLT). We complemented these measurements with archival infrared observations, such as Hubble Space Telescope (HST)/Wide Field Planetary Came…