Search Publications
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…
The young nuclear stellar disc in the SB0 galaxy NGC 1023
Morelli, L.; Dalla Bontà, E.; Corsini, E. M. +3 more
Small kinematically decoupled stellar discs with scalelengths of a few tens of parsec are known to reside in the centre of galaxies. Different mechanisms have been proposed to explain how they form, including gas dissipation and merging of globular clusters. Using archival Hubble Space Telescope imaging and ground-based integral-field spectroscopy…
Partitioning of integrated energy fluxes in four tail reconnection events observed by Cluster
Goldstein, Melvyn; Gurgiolo, Chris; Thaller, Scott +4 more
We present the partitioning of integrated energy flux from four tail reconnection events observed by Cluster, focusing on the relative contributions of Poynting flux, electron, H+ and O+ enthalpy, and kinetic energy flux in the tailward and earthward directions in order to study temporal and spatial features of each event. We further subdivide the…
Studying the Interstellar Medium and the Inner Region of NPS/LOOP 1 with Shadow Observations toward MBM36
Liu, W.; Galeazzi, M.; Ursino, E.
We analyzed data from a shadow observation of the high density molecular cloud MBM36 (l ∼ 4°, b ∼ 35°) with Suzaku. MBM36 is located in a region that emits relatively weakly in the 3/4 keV band compared to the surrounding North Polar Spur (NPS)/Loop 1 structure and the Galactic Bulge (GB). The contrast between high and low density targets in the M…
A Multi-instrument Analysis of a C4.1 Flare Occurring in a δ Sunspot
Guglielmino, S. L.; Romano, P.; Zuccarello, F. P. +5 more
We present an analysis of multi-instrument space- and ground-based observations relevant to a C4.1 solar flare that occurred in the active region (AR) NOAA 11267 on 2011 August 6. Solar Dynamics Observatory observations indicate that at the flare’s beginning, it was localized in the preceding sunspot of the AR, which exhibits a δ configuration. Al…