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A Systematic Study of the Dust of Galactic Supernova Remnants. I. The Distance and the Extinction
Jiang, Biwei; Chen, Bingqiu; Zhao, He +3 more
By combining the photometric, spectroscopic, and astrometric information of the stars in the sightline of supernova remnants (SNRs), the distances to and the extinctions of 32 Galactic SNRs are investigated. The stellar atmospheric parameters are from the Sloan Digital Sky Survey-DR14/Apache Point Observatory Galaxy Evolution Experiment and Large …
Magnetic reconnection in partially ionized plasmas
Ni, Lei; Murphy, Nicholas A.; Ji, Hantao +1 more
Magnetic reconnection has been intensively studied in fully ionized plasmas. However, plasmas are often partially ionized in astrophysical environments. The interactions between the neutral particles and ionized plasmas might strongly affect the reconnection mechanisms. We review magnetic reconnection in partially ionized plasmas in different envi…
Aluminium oxide in the atmosphere of hot Jupiter WASP-43b
Helling, Christiane; Chubb, Katy L.; Min, Michiel +2 more
We have conducted a re-analysis of publicly available Hubble Space Telescope Wide Field Camera 3 (HST WFC3) transmission data for the hot-Jupiter exoplanet WASP-43b, using the Bayesian retrieval package Tau-REx. We report evidence of AlO in transmission to a high level of statistical significance (>5σ in comparison to a flat model, and 3.4σ in …
On the black hole content and initial mass function of 47 Tuc
Balbinot, E.; Hénault-Brunet, V.; Gieles, M. +3 more
The globular cluster (GC) 47 Tuc has recently been proposed to host an intermediate-mass black hole (IMBH) or a population of stellar mass black holes (BHs). To shed light on its dark content, we present an application of self-consistent multimass models with a varying mass function and content of stellar remnants, which we fit to various observat…
Strong chemical tagging with APOGEE: 21 candidate star clusters that have dissolved across the Milky Way disc
Cohen, Roger E.; Bovy, Jo; Brownstein, Joel R. +12 more
Chemically tagging groups of stars born in the same birth cluster is a major goal of spectroscopic surveys. To investigate the feasibility of such strong chemical tagging, we perform a blind chemical tagging experiment on abundances measured from APOGEE survey spectra. We apply a density-based clustering algorithm to the 8D chemical space defined …
Neutrino clustering in the Milky Way and beyond
Lesgourgues, J.; de Salas, P. F.; Gariazzo, S. +3 more
The standard cosmological model predicts the existence of a Cosmic Neutrino Background, which has not yet been observed directly. Some experiments aiming at its detection are currently under development, despite the tiny kinetic energy of the cosmological relic neutrinos, which makes this task incredibly challenging. Since massive neutrinos are at…
Deciphering the Lyman α blob 1 with deep MUSE observations
Scarlata, Claudia; Hayes, Matthew; Herenz, Edmund Christian
Context. Lyman α blobs (LABs) are large-scale radio-quiet Lyman α (Lyα) nebula at high-z that occur predominantly in overdense proto-cluster regions. In particular, there is the prototypical SSA22a-LAB1 at z = 3.1, which has become an observational reference for LABs across the electromagnetic spectrum.
Aims: We want to understand the powerin…
Decoding the radial velocity variations of HD 41248 with ESPRESSO
Adibekyan, V.; Sousa, S. G.; Barros, S. C. C. +13 more
Context. Twenty-four years after the discoveries of the first exoplanets, the radial-velocity (RV) method is still one of the most productive techniques to detect and confirm exoplanets. But stellar magnetic activity can induce RV variations large enough to make it difficult to disentangle planet signals from the stellar noise. In this context, HD…
The WISSH quasars project. VII. The impact of extreme radiative field in the accretion disc and X-ray corona interplay
Fiore, F.; Marconi, A.; Vignali, C. +14 more
Hyper-luminous quasars (Lbol ≳ 1047 erg s-1) are ideal laboratories to study the interaction and impact of the extreme radiative field and the most powerful winds in the active galactic nuclei (AGN) nuclear regions. They typically exhibit low coronal X-ray luminosity (LX) compared to the ultraviolet (UV)…
The Influence of Spacecraft Charging on Low-Energy Ion Measurements Made by RPC-ICA on Rosetta
Stenberg Wieser, Gabriella; Wieser, Martin; Eriksson, Anders +2 more
Spacecraft charging is problematic for low-energy plasma measurements. The charged particles are attracted to or repelled from the charged spacecraft, affecting both the energy and direction of travel of the particles. The Ion Composition Analyzer (RPC-ICA) on board the Rosetta spacecraft is suffering from this effect. RPC-ICA was measuring positi…