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Joining X-Ray to Lensing: An Accurate Combined Analysis of MACS J0416.1-2403
Grillo, C.; Balestra, I.; Rosati, P. +6 more
We present a novel approach for a combined analysis of X-ray and gravitational lensing data and apply this technique to the merging galaxy cluster MACS J0416.1-2403. The method exploits the information on the intracluster gas distribution that comes from a fit of the X-ray surface brightness and then includes the hot gas as a fixed mass component …
Lower hybrid waves at comet 67P/Churyumov-Gerasimenko
André, M.; Karlsson, T.; Henri, P. +9 more
We investigate the generation of waves in the lower hybrid frequency range by density gradients in the near plasma environment of comet 67P/Churyumov-Gerasimenko. When the plasma is dominated by water ions from the comet, a situation with magnetized electrons and unmagnetized ions is favourable for the generation of lower hybrid waves. These waves…
Revisiting the extremely fast disc wind in a gravitationally lensed quasar APM 08279+5255
Done, Chris; Takahashi, Tadayuki; Hagino, Kouichi +2 more
The gravitationally lensed quasar APM 08279+5255 has the fastest claimed wind from any active galactic nucleus, with velocities of 0.6-0.7c, requiring magnetic acceleration as special relativistic effects limit all radiatively driven winds to v < 0.3-0.5c. However, this extreme velocity derives from interpreting both the narrow and broad absorp…
Structure and density of Callisto's atmosphere from a fluid-kinetic model of its ionosphere: Comparison with Hubble Space Telescope and Galileo observations
Saur, Joachim; Strobel, Darrell F.; Hartkorn, Oliver
We develop a model of the ionospheric electron population of Jupiter's moon Callisto using a prescribed neutral atmosphere composed of O2, CO2 and H2O. A kinetic description of ionospheric suprathermal electrons coupled with a fluid description of ionospheric thermal electrons is well suited to jointly analyze and …
Asteroid-comet continuum objects in the solar system
Hsieh, Henry H.
In this review presented at the Royal Society meeting, `Cometary science after Rosetta', I present an overview of studies of small solar system objects that exhibit properties of both asteroids and comets (with a focus on so-called active asteroids). Sometimes referred to as `transition objects', these bodies are perhaps more appropriately describ…
Binary companions of nearby supernova remnants found with Gaia
Evans, N. W.; Fraser, M.; Izzard, R. G. +2 more
Aims: We search for runaway former companions of the progenitors of nearby Galactic core-collapse supernova remnants (SNRs) in the Tycho-Gaia astrometric solution (TGAS).
Methods: We look for candidates among a sample of ten SNRs with distances ≲2kpc, taking astrometry and G magnitude from TGAS and B,V magnitudes from the AAVSO Photometr…
Statistical Study of Solar Dimmings Using CoDiT
Krista, Larisza D.; Reinard, Alysha A.
We present the results from analyzing the physical and morphological properties of 154 dimmings (transient coronal holes) and the associated flares and coronal mass ejections (CMEs). Each dimming in our 2013 catalog was processed with the semi-automated Coronal Dimming Tracker using Solar Dynamics Observatory AIA 193 Å observations and HMI magneto…
A close encounter of the massive kind
Maíz Apellániz, J.; Sana, H.; Barbá, R. H. +2 more
We have used (I) Hubble Space Telescope Advanced Camera for Surveys imaging and Space Telescope Imaging Spectrograph spectroscopy, (II) ground-based Precision Integrated-Optics Near-infrared Imaging ExpeRiment/Very Large Telescope long-baseline interferometry, and (III) ground-based spectroscopy from different instruments to study the orbit of the…
Powerful CMD: a tool for color-magnitude diagram studies
Fan, Zhou; Chen, Li; Li, Zhong-Mu +5 more
We present a new tool for color-magnitude diagram (CMD) studies, Powerful CMD. This tool is built based on the advanced stellar population synthesis (ASPS) model, in which single stars, binary stars, rotating stars and star formation history have been taken into account. Via Powerful CMD, the distance modulus, color excess, metallicity, age, binar…
Multi-wavelength campaign on NGC 7469. I. The rich 640 ks RGS spectrum
Kaspi, Shai; Kriss, Gerard A.; Mehdipour, Missagh +15 more
Aims: Outflows in active galaxies (AGNs) are common, although their launching mechanism, location, and physical impact on the host galaxy remain controversial. We conducted a multi-wavelength six-month campaign to observe the nearby Seyfert galaxy NGC 7469 with several observatories in order to better understand and quantify the outflow in th…