Search Publications
The multiphase environment in the centre of Centaurus A
De Marco, B.; Migliori, G.; Różańska, A. +6 more
We study the multiphase medium in the vicinity of the active galactic nucleus Centaurus A (Cen A). Combined high-resolution observations with the Atacama Large Millimeter/submillimeter Array (ALMA) and Chandra X-ray Observatory indicate that the hot X-ray emitting plasma coexists with the warm and cold media in Cen A. This complex environment is a…
The bi-modal 7Li distribution of the Milky Way's thin-disk dwarf stars. The role of Galactic-scale events and stellar evolution
Cifuentes, C.; Roca-Fàbrega, S.; Llorente de Andrés, F. +2 more
Context. The lithium abundance, A(Li), in stellar atmospheres suffers from various enhancement and depletion processes during the star's lifetime. While several studies have demonstrated that these processes are linked to the physics of stellar formation and evolution, the role that Galactic-scale events play in the galactic A(Li) evolution is not…
Magnetohydrodynamic Turbulence in the Earth's Magnetotail from Observations and Global MHD Simulations
Lapenta, Giovanni; Goldstein, Melvyn L.; El-Alaoui, Mostafa +2 more
Magnetohydrodynamic (MHD) turbulent flows are found in the solar wind, the magnetosheath and the magnetotail plasma sheet. In this paper, we review both observational and theoretical evidence for turbulent flow in the magnetotail. MHD simulations of the global magnetosphere for southward interplanetary magnetic field (IMF) exhibit nested vortices …
Catalogue of in situ observed solar energetic electrons from ACE/EPAM instrument
Miteva, Rositsa; Samwel, Susan W.
We present the first comprehensive catalogue of in situ observed solar energetic electron (SEE) events that covers solar cycles [SCs] 23 and 24 in the energy range 103-315 keV. The electron enhancements are detected by the Electron, Proton, and Alpha Monitor - Deflected Electrons instrument [EPAM-DE] aboard the ACE spacecraft. Onset time, peak tim…
Multi-wavelength observations and modelling of a quiescent cloud LDN1512
Ysard, Nathalie; Juvela, Mika; Saajasto, Mika +2 more
Context. Light scattering at near-infrared (NIR) wavelengths has been used to study the optical properties of the interstellar dust grains, but these studies are limited by the assumptions on the strength of the radiation field. On the other hand, thermal dust emission can be used to constrain the properties of the radiation field, although this i…
Active Boulder Falls in Terra Sirenum, Mars: Constraints on Timing and Causes
Conway, Susan J.; Grindrod, Peter M.; Davis, Joel M. +1 more
We use time series images to identify significant active boulder falls in an impact crater on Mars. Evidence for active boulder falls include boulder trails with impact marks from bouncing and rolling, and dark patches from boulder impacts away from the base of the crater walls. We were able to define three time periods with active boulder falls a…
From downtown to the outskirts: a radio survey of the Orion Nebula Cluster
Bally, J.; Forbrich, J.; Dzib, S. A. +1 more
We present a newly enlarged census of the compact radio population towards the Orion Nebula Cluster (ONC) using high-sensitivity continuum maps (3-10 $\mu$Jy beam-1) from a total of ~30-h centimetre-wavelength observations over an area of ~20 × 20 arcmin2 obtained in the C-band (4-8 GHz) with the Karl G. Jansky Very Large Arr…
Towards a larger sample of radio jets from quiescent black hole X-ray binaries
Maccarone, T. J.; Gandhi, P.; Miller-Jones, J. C. A. +5 more
Quiescent black hole X-ray binaries (X-ray luminosities ${\lesssim} 10^{34}\,{\rm erg}\, {\rm s}^{-1}$) are believed to be fed by hot accretion flows that launch compact, relativistic jets. However, due to their low luminosities, quiescent jets have been detected in the radio waveband from only five systems so far. Here, we present radio observati…
A new method for detecting solar atmospheric gravity waves
Fleck, Bernhard; Berrilli, Francesco; Calchetti, Daniele +2 more
Internal gravity waves have been observed in the Earth's atmosphere and oceans, on Mars and Jupiter, and in the Sun's atmosphere. Despite ample evidence for the existence of propagating gravity waves in the Sun's atmosphere, we still do not have a full understanding of their characteristics and overall role for the dynamics and energetics of the s…
Quest for the Upcoming Periastron Passage of an Episodic Dust Maker and Particle-accelerating Colliding-wind Binary: WR 125
Pandey, J. C.; Pandey, S. B.; Sharma, Saurabh +4 more
We have carried out a long-term infrared and X-ray investigation of the colliding-wind binary WR 125 (WC7 + O9III). The source was monitored using AstroSat Soft X-ray Telescope and the Tata Institute of Fundamental Research Near Infrared Imaging Camera-II mounted at the back of 3.6 m Devasthal Optical Telescope. WR 125 appeared brighter in the nea…