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Direct Measurement of Low-Energy Electron Foreshock Beams
Soucek, Jan; Píša, David; Santolík, Ondrej
Electrostatic plasma waves above and below the local electron plasma frequency represent a characteristic feature of the foreshock region. These waves are known to be generated by electron beams originating from the bow shock and their spectrum varies from narrowband intense waves close to foreshock edge to weaker broadband emissions further downs…
Galactic halo age estimated from LAMOST DR4 and Gaia DR1
Yuan, Hai-Bo; Huang, Yang; Chen, Bing-Qiu +8 more
The stellar halo is one of the major components in the Milky Way. Research on its age can provide critical constraints on the origin of the stellar halo and further on the formation of our Galaxy. So far, different approaches and samples have been used to estimate the age of the Galactic halo. In our previous paper, we carefully selected 63 field …
Stellar Occultation by Comet 67P/Churyumov-Gerasimenko Observed with Rosetta's Alice Far-ultraviolet Spectrograph
Parker, Joel Wm.; Bertaux, Jean-Loup; Stern, S. Alan +13 more
Following our previous detection of ubiquitous {{{H}}}2{{O}} and {{{O}}}2 absorption against the far-ultraviolet continuum of stars located near the nucleus of Comet 67P/Churyumov-Gerasimenko, we present a serendipitously observed stellar occultation that occurred on 2015 September 13, approximately one month after the comet’…
A SCUBA-2 selected Herschel-SPIRE dropout and the nature of this population
Andreani, P.; Yun, M. S.; Clements, D. L. +19 more
Dusty star-forming galaxies (DSFGs) detected at z > 4 provide important examples of the first generations of massive galaxies. However, few examples with spectroscopic confirmation are currently known, with Hershel struggling to detect significant numbers of z > 6 DSFGs. NGP6_D1 is a bright 850 µm source (12.3 ± 2.5 mJy) with no counte…
Axisymmetric density waves in Saturn's rings
Nicholson, P. D.; Hedman, M. M.
Density waves in Saturn's rings are usually tightly wrapped spiral patterns generated by resonances with either Saturn's moons or structures inside the planet. However, between the Barnard and Bessel Gaps in the Cassini Division (i.e. between 120 240 and 120 300 km from Saturn's spin axis), there are density variations that appear to form an axisy…
Analysis of a detached eclipsing binary at near the turnoff point of the open cluster NGC 6791 in Kepler field
Çakırlı, Ö.; Dervişoğlu, A.; Yontan, T. +2 more
We analyzed high-precision Kepler photometry and high-resolution UVES and GIRAFFE spectroscopy from ESO Science Archieve for a double-lined eclipsing binary star in the field of the high metallicity old open cluster NGC 6791. Earlier measurements of the masses and radii of the detached system were not accurate enough for photometric and spectrosco…
IGR J17503-2636: a candidate supergiant fast X-ray transient
Sanna, A.; Ferrigno, C.; Di Salvo, T. +4 more
The object IGR J17503-2636 is a hard X-ray transient discovered by INTEGRAL on 2018 August 11. This was the first ever reported X-ray emission from this source. Following the discovery, follow-up observations were carried out with Swift, Chandra, NICER, and NuSTAR. Here we report on the analysis of all of these X-ray data and the results obtained.…
The First Candidate Colliding-wind Binary in M33
Williams, Benjamin F.; Massey, Philip; Levesque, Emily M. +1 more
We present the detection of the first candidate colliding-wind binary (CWB) in M33, located in the giant H II region NGC 604. The source was first identified in archival Chandra imaging as a relatively soft X-ray point source, with the likely primary star determined from precise astrometric alignment between archival Hubble Space Telescope and Cha…
A real-time, high-accuracy, hardware-based integrated parameter estimator for deep space navigation and planetary radio science experiments
Liu, Wei; Wang, Zhen; Jian, Nianchuan +9 more
Real-time, high-accuracy frequency-phase estimation is the critical mission of Doppler tracking, which is a primary technique for deep space spacecraft navigation and planetary radio science experiments. Usually, the analog intermediate frequency signal is digitalized and converted to baseband by signal processing hardware platforms called digital…
How Much of the Sediment in Gale Crater's Central Mound Was Fluvially Transported?
Fassett, Caleb I.; Thomson, Bradley J.; Buczkowski, Debra L. +2 more
The origin of the sedimentary mound within Gale crater, the landing site for the Mars Science Laboratory rover Curiosity, remains enigmatic. Here we examine the total potential contribution of fluvial material by conducting a volume-based analysis. On the basis of these results, the mound can be divided into three zones: lower, intermediate, and u…