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Oxygen ion response to proton bursty bulk flows
Karlsson, Tomas; Nilsson, Hans; Gunell, Herbert +6 more
We have used Cluster spacecraft data from the years 2001 to 2005 to study how oxygen ions respond to bursty bulk flows (BBFs) as identified from proton data. We here define bursty bulk flows as periods of proton perpendicular velocities more than 100 km/s and a peak perpendicular velocity in the structure of more than 200 km/s, observed in a regio…
Constraining SN feedback: a tug of war between reionization and the Milky Way satellites
Lacey, Cedric G.; Hou, Jun; Frenk, Carlos. S. +1 more
Theoretical models of galaxy formation based on the cold dark matter cosmogony typically require strong feedback from supernova (SN) explosions in order to reproduce the Milky Way satellite galaxy luminosity function and the faint end of the field galaxy luminosity function. However, too strong a SN feedback also leads to the universe reionizing t…
X-ray and optical observations of four polars
Granzer, T.; Schwope, A. D.; Traulsen, I. +3 more
Aims: We investigate the temporal and spectral behaviour of four polar cataclysmic variables from the infrared to X-ray regimes, refine our knowledge of the physical parameters of these systems at different accretion rates, and search for a possible excess of soft X-ray photons.
Methods: We obtained and analysed four XMM-Newton X-ray obs…
Dust in a compact, cold, high-velocity cloud: A new approach to removing foreground emission
Kerp, J.; Lenz, D.; Flöer, L.
Context. Because isolated high-velocity clouds (HVCs) are found at great distances from the Galactic radiation field and because they have subsolar metallicities, there have been no detections of dust in these structures. A key problem in this search is the removal of foreground dust emission.
Aims: Using the Effelsberg-Bonn H I Survey and th…
NuSTAR and XMM-Newton Observations of 1E1743.1-2843: Indications of a Neutron Star LMXB Nature of the Compact Object
Hailey, Charles J.; Mori, Kaya; Zhang, Shuo +13 more
We report on the results of NuSTAR and XMM-Newton observations of the persistent X-ray source 1E1743.1-2843, located in the Galactic Center region. The source was observed between 2012 September and October by NuSTAR and XMM-Newton, providing almost simultaneous observations in the hard and soft X-ray bands. The high X-ray luminosity points to the…
The Kinematics of the Nebular Shells Around Low Mass Progenitors of PNe with Low Metallicity
Richer, Michael G.; López, José Alberto; Pereyra, Margarita
We analyze the internal kinematics of 26 planetary nebulae (PNe) with low metallicity that appear to derive from progenitor stars of the lowest masses, including the halo PN population. Based upon spatially resolved, long-slit, echelle spectroscopy drawn from the San Pedro Mártir Kinematic Catalog of PNe, we characterize the kinematics of these PN…
Stellar classification of CoRoT targets
Deeg, H.; Deleuil, M.; Moutou, C. +4 more
Context. The CoRoT mission was the first dedicated to the search for exoplanets from space. The CoRoT exoplanet channel observed about 163 600 targets to detect transiting planetary companions. In addition to the search for exoplanets, the extremely precise photometric time series provided by CoRoT for this vast number of stars is an invaluable re…
High-angular-resolution stellar imaging with occultations from the Cassini spacecraft - III. Mira
Nicholson, Philip D.; Hedman, Matthew M.; Stewart, Paul N. +1 more
We present an analysis of spectral and spatial data of Mira obtained by the Cassini spacecraft, which not only observed the star's spectra over a broad range of near-infrared wavelengths, but was also able to obtain high-resolution spatial information by watching the star pass behind Saturn's rings. The observed spectral range of 1-5 microns revea…
The VIRUS-P Exploration of Nearby Galaxies (VENGA): Radial Gas Inflow and Shock Excitation in NGC 1042
Blanc, Guillermo A.; Jogee, Shardha; Luo, Rongxin +3 more
NGC 1042 is a late-type bulgeless disk galaxy that hosts low-luminosity active galactic nuclei (AGNs) coincident with a massive nuclear star cluster. In this paper, we present the integral field spectroscopy studies of this galaxy, based on the data obtained with the Mitchell spectrograph on the 2.7 m Harlan J. Smith telescope. In the central 100-…
Contamination in electron observations of the silicon detector on board Cluster/RAPID/IES instrument in Earth's radiation belts and ring current
Daly, P. W.; Klecker, B.; Pierrard, V. +10 more
Since more than 15 years, the Cluster mission passes through Earth's radiation belts at least once every 2 days for several hours, measuring the electron intensity at energies from 30 to 400 keV. These data have previously been considered not usable due to contamination caused by penetrating energetic particles (protons at >100 keV and electron…