Search Publications
Feedback factory: multiple faint radio jets detected in a cluster at z = 2
Daddi, Emanuele; Finoguenov, Alexis; Elbaz, David +8 more
We report the detection of multiple faint radio sources, that we identify as active galactic nucleus (AGN) jets, within CLJ1449+0856 at z = 2 using 3 GHz Very Large Array observations. We study the effects of radio-jet-based kinetic feedback at high redshifts, which has been found to be crucial in low-redshift clusters to explain the observed ther…
Photometric follow-up observations and transit timing analysis of HAT-P-37b
Li, Kai; Liu, Yuan; Yang, Jia-Mei +1 more
We performed follow-up photometric observations on exoplanetary system HAT-P-37 from 2011 February to 2019 September. The nine new transit light curves of the R and V bands are presented in this work. Based on the new light curves and published literature data, the physical and orbital parameters of HAT-P-37 are refined. In addition, mid-transit t…
Detailed Structure of Very High-β Earth Bow Shock
Petrukovich, A. A.; Chugunova, O. M.
Observations of Earth's bow shock with high β≥10 (ratio of thermal to magnetic pressure) are rare. However, such shocks are supposed to be ubiquitous in astrophysical plasmas. We present statistics of several tens crossings with β>10 for MMS, Cluster and Geotail, 30 of which have β>30. For the latter subset, most of the crossings reveal upst…
Bayesian decomposition of the Galactic multi-frequency sky using probabilistic autoencoders
Enßlin, Torsten A.; Frank, Philipp; Müller, Ancla +2 more
Context. All-sky observations show both Galactic and non-Galactic diffuse emission, for example from interstellar matter or the cosmic microwave background (CMB). The decomposition of the emission into different underlying radiative components is an important signal reconstruction problem.
Aims: We aim to reconstruct radiative all-sky compone…
SDSS J1059+4251, a Highly Magnified z 2.8 Star-forming Galaxy: ESI Observations of the Rest-frame UV Spectrum
Pettini, Max; Erb, Dawn K.; James, Bethan L. +3 more
Detailed analyses of high-redshift galaxies are challenging because these galaxies are faint, but this difficulty can be overcome with gravitational lensing, in which the magnification of the flux enables spectroscopy with a high signal-to-noise ratio (S/N). We present the rest-frame ultraviolet (UV) Keck Echellette Spectrograph and Imager (ESI) s…
The Complex Nature of Magnetic Element Transport in the Quiet Sun: The Multiscaling Character
Consolini, Giuseppe; Giannattasio, Fabio
In recent studies the dynamic properties of small-scale magnetic fields (magnetic elements [MEs]) in the quiet Sun were used to investigate peculiar features of turbulent convection and get insights on the characteristic spatial and temporal scales of evolution of magnetic fields, from granular to supergranular. The aim of this work is to extend p…
Tropopause and lower stratosphere winds and eddy fluxes on Saturn as seen by Cassini imaging
Del Genio, Anthony D.; Barbara, John M.
An automated cloud feature tracking algorithm is applied to 2004 Cassini Imaging Science Subsystem images of Saturn's southern hemisphere and equatorial region (5°N-70°S) in continuum, methane band, and ultraviolet filters to derive zonal wind profiles and eddy momentum fluxes from the middle troposphere cloud tops to the lower stratosphere. Zonal…
Thermophysical Characterization of Cyclic Frost Formation in the Subsurface and Nominal Water Activity on Comets: Case Study of 67P/Churyumov-Gerasimenko
Shi, Xian; Hu, Xuanyu
We use a generic thermophysical model to study in detail the formation of water-ice frost in the near-surface layers of comet 67P/Churyumov-Gerasimenko. We show that nightly frost formation is a common phenomenon. In particular, while abrupt landscapes may be conducive to frost formation, they are not a requisite condition. We show that the proces…
Sustaining Star Formation in the Galactic Star Cluster M 36?
Chen, Wen Ping; Gao, Yu; Sun, Yan +3 more
We present comprehensive characterization of the Galactic open cluster M 36. Some 200 member candidates, with an estimated contamination rate of ∼8%, have been identified on the basis of proper motion and parallax measured by the Gaia DR2. The cluster has a proper motion grouping around ( ${\mu }_{\alpha }\cos \delta =-0.15\pm 0.01$ <!-- -->…
Saturn's Nightside Ring Current During Cassini's Grand Finale
Roussos, E.; Cowley, S. W. H.; Bunce, E. J. +7 more
During Cassini's Grand Finale proximal orbits, the spacecraft traversed the nightside magnetotail to ∼21 Saturn radii. Clear signatures of Saturn's equatorial current sheet are observed in the magnetic field data. An axisymmetric model of the ring current is fitted to these data, amended to take into account the tilt of the current layer by solar …