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Inferring the Galactic Potential with GAIA and Friends: Synergies with Other Surveys
Sanderson, Robyn E.
In the coming decade, the Gaia satellite will precisely measure the positions and velocities of millions of stars in the Galactic halo, including stars in many tidal streams. These streams, the products of hierarchical accretion of satellite galaxies by the Milky Way (MW), can be used to infer the Galactic gravitational potential thanks to their i…
Tidal bridge and tidal dwarf candidates in the interacting system Arp194
Egorov, Oleg V.; Zasov, Anatoly V.; Saburova, Anna S. +1 more
Arp194 is a system of recently collided galaxies, where the southern galaxy (S) passed through the gaseous disc of the northern galaxy (N) which in turn consists of two close components. This system is of special interest due to the presence of regions of active star formation in the bridge between galaxies, the brightest of which (the region A) h…
Chromospheric evaporation flows and density changes deduced from Hinode/EIS during an M1.6 flare
Temmer, M.; Veronig, A. M.; Gömöry, P. +2 more
Aims: We study the response of the solar atmosphere during a GOES M1.6 flare using spectroscopic and imaging observations. In particular, we examine the evolution of the mass flows and electron density together with the energy input derived from hard X-ray (HXR) in the context of chromospheric evaporation.
Methods: We analyzed high-caden…
Dependence of Occurrence Rates of Solar Flares and Coronal Mass Ejections on the Solar Cycle Phase and the Importance of Large-scale Connectivity
Moon, Y. -J.; Nakariakov, V. M.; Lee, Kangjin
We investigate the dependence of the occurrence rates of major solar flares (M- and X-class) and front-side halo coronal mass ejections (FHCMEs), observed from 1996 to 2013, on the solar cycle (SC) phase for six active McIntosh sunspot group classes: Fkc, Ekc, Dkc, Fki, Eki, and Dki. We classify SC phases as follows: (1) ascending phase of SC 23 (…
Feature-tailored spectroscopic analysis of the supernova remnant Puppis A in X-rays
Luna, G. J. M.; Giacani, E.; Smith, M. J. S. +2 more
We introduce a distinct method for performing spatially resolved spectral analysis of astronomical sources with highly structured X-ray emission. The method measures the surface brightness of neighboring pixels to adaptively size and shape each region, thus the spectra from the bright and faint filamentary structures evident in the broadband image…
Rotational Dynamics and Star Formation in the Nearby Dwarf Galaxy NGC 5238
Cannon, John M.; Teich, Yaron G.; McNichols, Andrew T. +10 more
We present new H I spectral-line images of the nearby low-mass galaxy NGC 5238, acquired with the Karl G. Jansky Very Large Array. Located at a distance of 4.51 ± 0.04 Mpc, NGC 5238 is an actively star-forming galaxy with widespread Hα and ultraviolet (UV) continuum emission. The source is included in many ongoing and recent nearby galaxy surveys,…
Philae locating and science support by robotic vision techniques
Remetean, E.; Souvannavong, F.; Dolives, B. +4 more
The ROLIS, CIVA-P and OSIRIS instruments on-board the Philae lander and the Rosetta orbiter acquired high-resolution images during the lander's descent towards the targeted landing site Agilkia, during its unexpected rebounds and at the final landing site Abydos on comet 67P/Churyumov-Gerasimenko. We, exploited these images, using robotic vision t…
Star-formation Activity in the Neighborhood of W-R 1503-160L Star in the Mid-infrared Bubble N46
Dewangan, L. K.; Ojha, D. K.; Zinchenko, I. +4 more
In order to investigate star-formation (SF) processes in extreme environments, we have carried out a multi-wavelength analysis of the mid-infrared bubble N46, which hosts a WN7 Wolf-Rayet (W-R) star. We have used 13CO line data to trace an expanding shell surrounding the W-R star containing about five condensations within the molecular …
Proton and heavy ion acceleration by stochastic fluctuations in the Earth's magnetotail
Zimbardo, Gaetano; Greco, Antonella; Artemyev, Anton V. +2 more
Spacecraft observations show that energetic ions are found in the Earth's magnetotail, with energies ranging from tens of keV to a few hundreds of keV. In this paper we carry out test particle simulations in which protons and other ion species are injected in the Vlasov magnetic field configurations obtained by Catapano et al. (2015). These config…
CMB all-scale blackbody distortions induced by linearizing temperature
Notari, Alessio; Quartin, Miguel
Cosmic microwave background (CMB) experiments, such as WMAP and Planck, measure intensity anisotropies and build maps using a linearized formula for relating them to the temperature blackbody fluctuations. However, this procedure also generates a signal in the maps in the form of y -type distortions which is degenerate with the thermal Sunyaev Zel…