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Modelling the size of the very dynamic diamagnetic cavity of comet 67P/Churyumov-Gerasimenko
Szego, K.; Goetz, C.; Richter, I. +5 more
After the first detection of the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko, it became apparent that the boundary of this plasma region is very dynamic. To date hundreds of short cavity crossing events were detected, none lasting longer than an hour. This intermittent set of short events is very different from the classical cavity obser…
Herschel Spectroscopy of Early-type Galaxies
Young, Lisa M.; Crocker, Alison; Lapham, Ryen Carl
We present Herschel spectroscopy of atomic lines arising in photodissociation regions as well as ionization regions of nearby early-type galaxies (ETGs), focusing on the volume-limited Atlas3D sample. Our data include the [C II], [O I], and [N II] 122 and 205 µm lines, along with ancillary data including CO and H I maps. We find that ETGs ha…
Redetection of the Ionospheric H3+ Signature of Saturn's "Ring Rain"
Baines, Kevin H.; O'Donoghue, James; Moore, Luke +4 more
In April 2011 Saturn's midlatitude ionospheric H3+ emissions were detected, exhibiting anomalous (nonsolar) H3+ latitudinal variations consistent with the transport of water from specific locations in Saturn's rings, known as "ring rain". These products, transported to the planet along the magnetic field, may help to explain the unusual pattern of…
Precise CCD positions of Triton in 2014-2016 using the newest Gaia DR1 star catalogue
Wang, N.; Peng, Q. Y.; Xie, H. J. +3 more
755 new CCD observations during the years 2014-2016 have been reduced to derive the precise positions of Triton, the first satellite of Neptune. The observations were made by the 1-m telescope at Yunnan Observatory over 15 nights. The positions of Triton are measured with respect to the stars in Gaia DR1 star catalogue. The theoretical position of…
Ultracool dwarf benchmarks with Gaia primaries
Gromadzki, M.; Caballero, J. A.; Montes, D. +14 more
We explore the potential of Gaia for the field of benchmark ultracool/brown dwarf companions, and present the results of an initial search for metal-rich/metal-poor systems. A simulated population of resolved ultracool dwarf companions to Gaia primary stars is generated and assessed. Of the order of ∼24 000 companions should be identifiable outsid…
The VLT-FLAMES Tarantula Survey. XXVII. Physical parameters of B-type main-sequence binary systems in the Tarantula nebula
Howarth, I. D.; Crowther, P. A.; Dufton, P. L. +14 more
A spectroscopic analysis has been undertaken for the B-type multiple systems (excluding those with supergiant primaries) in the VLT-FLAMES Tarantula Survey (VFTS). Projected rotational velocities, vesini, for the primaries have been estimated using a Fourier Transform technique and confirmed by fitting rotationally broadened profiles. A…
SXP 15.6: X-ray spectral and temporal properties of a newly discovered pulsar in the Small Magellanic Cloud
Haberl, F.; Zezas, A.; Antoniou, V. +1 more
We report on the X-ray spectral and temporal properties of the Be/X-ray binary system XMMU J004855.5-734946 located in the Small Magellanic Cloud. The system was monitored by Swift/XRT during a moderate outburst in 2016 July, while an unanticipated Chandra target of opportunity observation was triggered when the luminosity of the system was greate…
Follow-up of isolated neutron star candidates from the eROSITA survey
Motch, C.; Pires, A. M.; Schwope, A. D.
Peculiar groups of X-ray emitting isolated neutron stars, which include magnetars, the "magnificent seven", and central compact objects in supernova remnants, escape detection in standard pulsar surveys. Yet, they constitute a key element in understanding the neutron star evolution and phenomenology. Their use in population studies in the galactic…
The Local Spiral Arm in the LAMOST-Gaia Common Stars?
Zhang, Yong; Wu, Yue; Liu, Chao +7 more
Using the LAMOST-Gaia common stars, we demonstrate that the in-plane velocity fields for the nearby young stars are significantly different from those for the old ones. For the young stars, the probably perturbed velocities that are similar to the old population are mostly removed from the velocity maps in the X-Y plane. The residual velocity fiel…
A Very Large (θ E ≳ 40″) Strong Gravitational Lens Selected with the Sunyaev-Zel’dovich Effect: PLCK G287.0+32.9 (z = 0.38)
Koekemoer, Anton M.; Zitrin, Adi; Nonino, Mario +7 more
Since galaxy clusters sit at the high end of the mass function, the number of galaxy clusters both massive and concentrated enough to yield particularly large Einstein radii poses useful constraints on cosmological and structure formation models. To date, less than a handful of clusters are known to have Einstein radii exceeding ∼ 40\prime\pr…