Search Publications
Occurrence frequency and location of magnetic islands at the dayside magnetopause
Allen, R. C.; Fuselier, S. A.; Trattner, K. J. +2 more
Simulations of magnetic reconnection often predict the formation of magnetic islands forming and propagating out through the reconnection exhaust region. However, to date, only a few observations of magnetic islands at the Earth's magnetopause have been identified and analyzed. Crossings near reconnection sites at the dayside magnetopause by Clust…
Hubble Space Telescope Imaging of the Ultra-compact High Velocity Cloud AGC 226067: A Stripped Remnant in the Virgo Cluster
Crnojević, D.; Sand, D. J.; Simon, J. D. +10 more
We analyze the optical counterpart to the ultra-compact high velocity cloud AGC 226067, utilizing imaging taken with the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope. The color-magnitude diagram of the main body of AGC 226067 reveals an exclusively young stellar population, with an age of ∼7-50 Myr, and is consistent with a meta…
The Asymmetric Bow Shock/Pulsar Wind Nebula of PSR J2124-3358
Slane, Patrick; Romani, Roger W.; Green, Andrew W.
We describe new measurements of the remarkable Hα/UV/X-ray bow shock and pulsar wind nebula (PWN) of the isolated millisecond pulsar (MSP) PSR J2124-3358. Chandra X-ray Observatory imaging shows a one-sided jet structure with a softer equatorial outflow. KOALA integral field unit spectroscopy shows that non-radiative emission dominates the bow sho…
Solar Tornadoes Triggered by Interaction between Filaments and EUV Jets
Zhang, Jun; Yan, Xiaoli; Xue, Jianchao +2 more
We investigate the formations and evolutions of two successive solar tornadoes in/near AR 12297 during 2015 March 19-20. Recurrent EUV jets close to two filaments were detected along a large-scale coronal loop prior to the appearances of the tornadoes. Under the disturbances from the activities, the filaments continually ascended and finally inter…
Atmospheric Photochemistry
Lefèvre, Franck; Krasnopolsky, Vladimir
Jets of SS 433 on scales of dozens of parsecs
Panferov, Alexander A.
Context. The radio nebula W 50 harbours the relativistic binary system
Comets as a possible source of nanodust in the Solar System cloud and in planetary debris discs
Mann, Ingrid
Comets, comet-like objects and their fragments are the most plausible source for the dust in both the inner heliosphere and planetary debris discs around other stars. The smallest size of dust particles in debris discs is not known and recent observational results suggest that the size distribution of the dust extends down to sizes of a few nanome…
Impact of Radiogenic Heating on the Formation Conditions of Comet 67P/Churyumov-Gerasimenko
Wurz, P.; Altwegg, K.; Balsiger, H. +19 more
Because of the high fraction of refractory material present in comets, the heat produced by the radiogenic decay of elements such as aluminum and iron can be high enough to induce the loss of ultravolatile species such as nitrogen, argon, or carbon monoxide during their accretion phase in the protosolar nebula (PSN). Here, we investigate how heat …
Multifrequency polarimetry of a complete sample of PACO radio sources
Ricci, R.; Bonaldi, A.; Bonavera, L. +16 more
We present high-sensitivity polarimetric observations (σP ≃0.6 mJy) in six bands covering the 5.5-38 GHz range of a complete sample of 53 compact extragalactic radio sources brighter than 200 mJy at 20 GHz. The observations, carried out with the Australia Telescope Compact Array, achieved a 91 per cent detection rate (at 5σ). Within thi…
Spatial distribution of far-infrared rotationally excited CH+ and OH emission lines in the Orion Bar photodissociation region
Abergel, A.; Godard, B.; Gerin, M. +7 more
Context. The methylidyne cation (CH+) and hydroxyl (OH) are key molecules in the warm interstellar chemistry, but their formation and excitation mechanisms are not well understood. Their abundance and excitation are predicted to be enhanced by the presence of vibrationally excited H2 or hot gas ( 500-1000 K) in photodissociat…