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De la boule de neige sale au canard en caoutchouc noir, 67P/ Churyumov Gerasimenko, From the dirty snowball to the rubber black duck, 67P/ Churyumov Gerasimenko
Borg, Janet
Rosetta has ended its mission on 30 September 2016 with a controlled impact in the Ma'at region on the small lobe of comet 67P/ Churyumov Gerasimenko. Since its arrival in the vicinity of the comet in august 2014, Rosetta has spent more than two years living with the comet, investigating its nucleus and its environment. It has witnessed how a come…
II Zwicky 23 and Family: A Group in Interaction
Rudie, Gwen C.; Gallagher, John S., III; Cigan, Phillip J. +1 more
II Zw 23 (UGC 3179) is a luminous (M B ∼ -21) nearby compact narrow emission line starburst galaxy with blue optical colors and strong emission lines. We present a photometric and morphological study of II Zw 23 and its interacting companion, KPG103a, using data obtained with the WIYN 3.5 m telescope in combination with a WFPC2 image …
Nonlinear effects related to circularly polarized dispersive Alfvén waves
Sharma, R. P.; Gaur, Nidhi; Sharma, Swati
In situ measurements of solar wind have strongly implicated its turbulent behavior. The observed power spectra report a breakpoint around length scales of the order of ion scales. As one of the responsible mechanisms for the observed steepening in power spectrum, our approach includes a right circularly polarized dispersive Alfvén wave (DAW) with …
Behind the Scenes of the Discovery Channel's Rosetta Mission Documentary Special
Ayres, S.
On the evening of 12 November 2014, the Discovery Channel documentary Landing on a Comet: Rosetta Mission was broadcast around the world. This was the culmination of months of preparation and behind-the-scenes lming. Shelley Ayres, the producer, director and writer of the one-hour special recounts how this came about and re ects on her experience.
First Search for an X-Ray-Optical Reverberation Signal in an Ultraluminous X-Ray Source
Cenko, S. Bradley; Gandhi, Poshak; Mushotzky, Richard F. +3 more
Using simultaneous optical (VLT/FORS2) and X-ray (XMM-Newton) data of NGC 5408, we present the first ever attempt to search for a reverberation signal in an ultraluminous X-ray source (NGC 5408 X-1). The idea is similar to active galactic nucleus broad line reverberation mapping where a lag measurement between the X-ray and the optical flux combin…
Peculiar Velocity Effects on the CMB
Quartin, Miguel
The aberration effect due to our peculiar velocity <math xmlns:xlink="http://www.w3.org/1999/xlink"> <mi>β</mi> boldsymbol{β } with respect to the CMB induces mixing among multipoles and off-diagonal correlations at all scales which can be used as a measurement of <math xmlns:xlink="http://www.w3.org/1999/xlink"> <mi>…
Modeling Rosetta's final descent
Blanco, Philip
Using Competitions to Engage the Public: Lessons Learnt from Rosetta
Bauer, M.; McCaughrean, M.; O'Flaherty, K. S. +9 more
The year 2014 was an historic and challenging time for the Rosetta mission. On 20 January the spacecraft awoke from a 957-day hibernation; by August, it had arrived at Comet 67P/Churyumov-Gerasimenko; and in November, the lander Philae was deployed to the comet's surface. These milestones were communicated by traditional outreach channels -- on we…
Assessing the contribution of centaur impacts to ice giant luminosities
Dodson-Robinson, Sarah E.
Voyager 2 observations revealed that Neptune's internal luminosity is an order of magnitude higher than that of Uranus. If the two planets have similar interior structures and cooling histories, Neptune's luminosity can only be explained by invoking some energy source beyond gravitational contraction. This paper investigates whether centaur impact…