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Spatial Variation in Temperature and Density in the IC 63 PDR from H2 Spectroscopy
Karoly, Janik; Soam, Archana; Andersson, B. -G. +2 more
We have measured the gas temperature in the IC 63 photodissociation region (PDR) using the S(1) and S(5) pure rotation lines of molecular hydrogen with SOFIA/EXES. We divide the PDR into three regions for analysis based on the illumination from γ Cas: sunny, ridge, and shady. Constructing rotation diagrams for the different regions, we obtain temp…
Processes in the Current Disruption Region: From Turbulence to Dispersion Relation
Daly, P. W.; Lui, A. T. Y.; Kronberg, E. A. +2 more
Using measurements from Cluster II space mission, we compared the characteristics of the fluctuations of the magnetic field magnitude and the Bz component in the current disruption (CD) regions. We used fast Fourier transform, statistical, and wavelet analysis, and wave surveyor technique on the multispacecraft measurements. Among the obtained res…
Constraining Soft and Hard X-Ray Irradiation in Ultraluminous X-Ray Sources
Feng, Hua; Qiu, Yanli
Most ultraluminous X-ray sources (ULXs) are argued to be powered by supercritical accretion onto compact objects. One of the key questions regarding these objects is whether or not the hard X-rays are geometrically beamed toward the symmetric axis. We propose testing the scenario using disk irradiation to see how much the outer accretion disk sees…
The flare-activity of 2MASS J16111534-1757214 in the upper Scorpius association
Guenther, E. W.; Chaturvedi, P.; Muheki, P. +3 more
Flares are known to play an important role for the evolution of the atmospheres of young planets. In order to understand the evolution of planets, it is thus important to study the flare-activity of young stars. This is particularly the case for young M‑stars, because they are very active. We study photometrically and spectroscopically the highly …
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…