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A new parameterization of the reionisation history
Aghanim, N.; Douspis, M.; Ilić, S. +1 more
Motivated by the current constraints on the epoch of reionisation from recent cosmic microwave background observations, ionising background measurements of star-forming galaxies, and low redshifts line-of-sight probes, we propose a new data-motivated parameterisation of the history of the average ionisation fraction. This parameterisation describe…
HSIM: a simulation pipeline for the HARMONI integral field spectrograph on the European ELT
Swinbank, A. M.; Fusco, T.; Kendrew, S. +5 more
We present HSIM: a dedicated pipeline for simulating observations with the High Angular Resolution Monolithic Optical and Near-infrared Integral field spectrograph (HARMONI) on the European Extremely Large Telescope. HSIM takes high spectral and spatial resolution input data cubes, encoding physical descriptions of astrophysical sources, and gener…
Broadband X-Ray Properties of the Gamma-Ray Binary 1FGL J1018.6-5856
An, Hongjun; Hailey, Charles J.; Kaspi, Victoria M. +11 more
We report on NuSTAR, XMM-Newton, and Swift observations of the gamma-ray binary 1FGL J1018.6-5856. We measure the orbital period to be 16.544 ± 0.008 days using Swift data spanning 1900 days. The orbital period is different from the 2011 gamma-ray measurement which was used in the previous X-ray study of An et al. using ∼400 days of Swift data, bu…
High Energy Spectral Evolution of V404 Cygni during the 2015 June Outburst as Observed by INTEGRAL
Ubertini, Pietro; Bazzano, Angela; Jourdain, Elisabeth +3 more
The black hole binary GS 2023+338 exhibited an unprecedently bright outburst in 2015 June. On 2015 June 17, the high energy instruments on board INTEGRAL detected an extremely variable emission during both bright and low luminosity phases, with dramatic variations of the hardness ratio on timescales of approximately seconds. The analysis of the IB…
An Off-nucleus Nonstellar Black Hole in the Seyfert Galaxy NGC 5252
Ho, Luis C.; Kim, Minjin; Bianchi, Stefano +6 more
We report the discovery of an ultraluminous X-ray source (ULX; CXO J133815.6+043255) in NGC 5252. This ULX is an off-nuclear point source, which is 22″ away from the center of NGC 5252, and has an X-ray luminosity of 1.5 × 1040 erg s-1. It is one of the rare examples of a ULX, which exhibits clear counterparts in radio, optic…
Responsibility of a Filament Eruption for the Initiation of a Flare, CME, and Blast Wave, and its Possible Transformation into a Bow Shock
Grechnev, V. V.; Chertok, I. M.; Kochanov, A. A. +3 more
Multi-instrument observations of two filament eruptions on 24 February and 11 May 2011 suggest the following updated scenario for eruptive flare, coronal mass ejection (CME), and shock wave evolution. An initial destabilization of a filament results in stretching out of the magnetic threads belonging to its body that are rooted in the photosphere …
Objective Image-Quality Assessment for High-Resolution Photospheric Images by Median Filter-Gradient Similarity
Cao, Wenda; Ji, Kaifan; Wang, Feng +6 more
All next-generation ground-based and space-based solar telescopes require a good quality-assessment metric to evaluate their imaging performance. In this paper, a new image quality metric, the median filter-gradient similarity (MFGS) is proposed for photospheric images. MFGS is a no-reference/blind objective image-quality metric (IQM) by a measure…
A method to derive maps of ionospheric conductances, currents, and convection from the Swarm multisatellite mission
Escoubet, C. P.; Kauristie, K.; Amm, O. +7 more
The European Space Agency (ESA) Swarm spacecraft mission is the first multisatellite ionospheric mission with two low-orbiting spacecraft that are flying in parallel at a distance of ~100-140 km, thus allowing derivation of spatial gradients of ionospheric parameters not only along the orbits but also in the direction perpendicular to them. A thir…
Self-consistent Castaing Distribution of Solar Wind Turbulent Fluctuations
Perri, S.; Carbone, V.; Sorriso-Valvo, L. +2 more
The intermittent behavior of solar wind turbulent fluctuations has often been investigated through the modeling of their probability distribution functions (PDFs). Among others, the Castaing model has successfully been used in the past. In this paper, the energy dissipation field of solar wind turbulence has been studied for fast, slow, and polar …
Can we trace very cold dust from its emission alone?
Juvela, M.; Pagani, L.; Pelkonen, V. -M. +2 more
Context. Dust is a good tracer of cold dark clouds but its column density is difficult to quantify.
Aims: We want to check whether the far-infrared and submillimeter high-resolution data from Herschel PACS and SPIRE and cameras combined with ground-based telescope bolometers allow us to retrieve the whole dust content of cold dark clouds.