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The ESPAS e-infrastructure: Access to data from near-Earth space
Hapgood, Mike; Belehaki, Anna; James, Sarah +9 more
ESPAS, the ;near-Earth space data infrastructure for e-science; is a data e-infrastructure facilitating discovery and access to observations, ground-based and space borne, and to model predictions of the near-Earth space environment, a region extending from the Earth's atmosphere up to the outer radiation belts. ESPAS provides access to metadata a…
The Optical Variability of SDSS Quasars from Multi-epoch Spectroscopy. III. A Sudden UV Cutoff in Quasar SDSS J2317+0005
Prochaska, J. Xavier; Ma, Jingzhe; Malkan, Matthew A. +6 more
We have collected near-infrared to X-ray data of 20 multi-epoch heavily reddened SDSS quasars to investigate the physical mechanism of reddening. Of these, J2317+0005 is found to be a UV cutoff quasar. Its continuum, which usually appears normal, decreases by a factor 3.5 at 3000 Å, compared to its more typical bright state during an interval of 2…
Cross-correlation analysis of CMB with foregrounds for residuals
Rath, Pranati K.; Aluri, Pavan K.
In this paper, we try to probe whether a clean cosmic microwave background (CMB) map obtained from the raw satellite data using a cleaning procedure is sufficiently clean. Specifically, we study if there are any foreground residuals still present in the cleaned data using a cross-correlation statistic. Residual contamination is expected to be pres…
HST STIS Observations of the Mixing Layer in the Cat’s Eye Nebula
Toalá, Jesús A.; Guerrero, Martín A.; Chu, You-Hua +2 more
Planetary nebulae (PNe) are expected to have a ∼105 K interface layer between the ≥slant 106 K inner hot bubble and the ∼104 K optical nebular shell. The PN structure and evolution, and the X-ray emission, depend critically on the efficiency of the mixing of material at this interface layer. However, neither its lo…
Determining the fraction of reddened quasars in COSMOS with multiple selection techniques from X-ray to radio wavelengths
Geier, S.; Milvang-Jensen, B.; Vestergaard, M. +8 more
The sub-population of quasars reddened by intrinsic or intervening clouds of dust are known to be underrepresented in optical quasar surveys. By defining a complete parent sample of the brightest and spatially unresolved quasars in the COSMOS field, we quantify to which extent this sub-population is fundamental to our understanding of the true pop…
Tracking of magnetic flux concentrations over a five-day observation, and an insight into surface magnetic flux transport
Iida, Yusuke
The solar dynamo problem is the question of how the cyclic variation in the solar magnetic field is maintained. One of the important processes is the transport of magnetic flux by surface convection. To reveal this process, the dependence of the squared displacement of magnetic flux concentrations on the elapsed time is investigated in this paper …
Multiple Outflows in the Giant Eruption of a Massive Star
Humphreys, Roberta M.; Jones, Terry J.; Gordon, Michael S. +1 more
The supernova impostor PSN J09132750+7627410 in NGC 2748 reached a maximum luminosity of ≈-14 mag. It was quickly realized that it was not a true supernova, but another example of a nonterminal giant eruption. PSN J09132750+7627410 is distinguished by multiple P Cygni absorption minima in the Balmer emission lines that correspond to outflow veloci…
SZ/X-ray scaling relations using X-ray data and Planck Nominal maps
Atrio-Barandela, F.; De Martino, I.
We determine the relation between the Comptonization parameter predicted using X-ray data YC, Xray and the X-ray luminosity LX, both magnitudes derived from ROSAT data, with the Comptonization parameter YC, SZ measured on Planck 2013 foreground cleaned Nominal maps. The 560 clusters of our sample includes clusters …
Investigating the Circumstellar Disk of the Be Shell Star 48 Librae
Okazaki, A. T.; Carciofi, A. C.; Bednarski, D. +6 more
A global disk oscillation implemented in the viscous decretion disk (VDD) model has been used to reproduce most of the observed properties of the well known Be star ζ Tau. 48 Librae shares several similarities with ζ Tau—they are both early-type Be stars, display shell characteristics in their spectra, and exhibit cyclic V/R variations—but has som…
Challenging Some Contemporary Views of Coronal Mass Ejections. I. The Case for Blast Waves
Pizzo, V. J.; Howard, T. A.
Since the closure of the “solar flare myth” debate in the mid-1990s, a specific narrative of the nature of coronal mass ejections (CMEs) has been widely accepted by the solar physics community. This narrative describes structured magnetic flux ropes at the CME core that drive the surrounding field plasma away from the Sun. This narrative replaced …