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A Solar Flare Disturbing a Light Wall above a Sunspot Light Bridge
Hou, Yijun; Li, Ting; Yang, Shuhong +3 more
With the high-resolution data from the Interface Region Imaging Spectrograph, we detect a light wall above a sunspot light bridge in the NOAA active region (AR) 12403. In the 1330 Å slit-jaw images, the light wall is brighter than the ambient areas while the wall top and base are much brighter than the wall body, and it keeps oscillating above the…
Suzaku X-ray Observations of the Nearest Non-Cool Core Cluster, Antlia: Dynamically Young but with Remarkably Relaxed Outskirts
Sarazin, Craig L.; Reiprich, Thomas H.; Wik, Daniel R. +4 more
We present the results of seven Suzaku mosaic observations (>200 ks in total) of the nearest non-cool core cluster, the Antlia Cluster (or Group), beyond its degree-scale virial radius in its eastern direction. The temperature is consistent with the scaled profiles of many other clusters. Its pressure follows the universal profile. The density …
Testing the theory of colliding winds: the periastron passage of 9 Sagittarii. I. X-ray and optical spectroscopy
Gosset, E.; Blomme, R.; Nazé, Y. +7 more
Context. The long-period, highly eccentric O-star binary 9 Sgr, known for its non-thermal radio emission and its relatively bright X-ray emission, went through its periastron in 2013.
Aims: Such an event can be used to observationally test the predictions of the theory of colliding stellar winds over a broad range of wavelengths.
Methods…
The Supernova Impostor PSN J09132750+7627410 and Its Progenitor
Zaggia, S.; Ochner, P.; Cappellaro, E. +11 more
We report the results of our follow-up campaign of the supernova impostor PSN J09132750+7627410, based on optical data covering ∼250 days. From the beginning, the transient shows prominent narrow Balmer lines with P-Cygni profiles, with a blueshifted absorption component becoming more prominent with time. Along the ∼3 months of the spectroscopic m…
The Shaping of the Multipolar Pre-planetary Nebula CRL 618 by Multidirectional Bullets
Lee, Chin-Fei; Moraghan, Anthony; Smith, Michael +1 more
In order to understand the formation of the multipolar structures of the pre-planetary nebula CRL 618, we perform 3D simulations using a multidirectional bullet model. The optical lobes of CRL 618 and fast molecular outflows at the tips of the lobes have been found to have similar expansion ages of ∼100 yr. Additional fast molecular outflows were …
GW Librae: a unique laboratory for pulsations in an accreting white dwarf
Knigge, C.; Hermes, J. J.; Gänsicke, B. T. +22 more
Non-radial pulsations have been identified in a number of accreting white dwarfs in cataclysmic variables. These stars offer insight into the excitation of pulsation modes in atmospheres with mixed compositions of hydrogen, helium, and metals, and the response of these modes to changes in the white dwarf temperature. Among all pulsating cataclysmi…
The CHARA Array resolves the long-period Wolf-Rayet binaries WR 137 and WR 138
Gies, Douglas R.; Moffat, Anthony F. J.; Richardson, Noel D. +10 more
We report on interferometric observations with the CHARA Array of two classical Wolf-Rayet (WR) stars in suspected binary systems, namely WR 137 and WR 138. In both cases, we resolve the component stars to be separated by a few milliarcseconds. The data were collected in the H band, and provide a measure of the fractional flux for both stars in ea…
Modeling the shock-cloud interaction in SN 1006: Unveiling the origin of nonthermal X-ray and γ-ray emission
Miceli, M.; Decourchelle, A.; Orlando, S. +9 more
Context. The supernova remnant SN 1006 is a source of high-energy particles and its southwestern limb is interacting with a dense ambient cloud, thus is a promising region for γ-ray hadronic emission.
Aims: We aim at describing the physics and the nonthermal emission associated with the shock-cloud interaction to derive the physical parameter…
Chandra Observations of Eight Sources Discovered by INTEGRAL
Rahoui, Farid; Fornasini, Francesca M.; Bodaghee, Arash +5 more
We report on 0.3-10 keV observations with the Chandra X-ray Observatory of eight hard X-ray sources discovered within 8° of the Galactic plane by the International Gamma-ray Astrophysics Laboratory satellite. The short (∼5 ks) Chandra observations of the IGR source fields have yielded very likely identifications of X-ray counterparts for three of …
Characterization of the permittivity of controlled porous water ice-dust mixtures to support the radar exploration of icy bodies
Thomas, N.; Brouet, Y.; Pommerol, A. +6 more
The internal properties of porous and icy bodies in the solar system can be investigated by ground-penetrating radars (GPRs), like the COmet Nucleus Sounding Experiment by Radiowave Transmission instrument on board the Rosetta spacecraft which has sounded the interior of the nucleus of comet 67P/Churyumov-Gerasimenko. Accurate constraints on the p…