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Disentangling the X-ray variability in the Lyman continuum emitter Haro 11
Östlin, G.; Herenz, E. C.; Silich, S. +1 more
Context. Lyman break analogs in the local Universe serve as counterparts to Lyman break galaxies (LBGs) at high redshifts, which are widely regarded as major contributors to cosmic reionization in the early stages of the Universe. Aims. We studied XMM-Newton and Chandra observations of the nearby LBG analog Haro 11, which contains two X-ray-bright…
CURLING - I. The influence of point-like image approximation on the outcomes of cluster strong lens modelling
Li, Jiadong; Kneib, Jean-Paul; Acebron, Ana +11 more
Cluster-scale strong lensing is a powerful tool for exploring the properties of dark matter and constraining cosmological models. However, due to the complex parameter space, pixelized strong lens modelling in galaxy clusters is computationally expensive, leading to the point-source approximation of strongly lensed extended images, potentially int…
The MUSE eXtremely Deep Field: Detections of circumgalactic Si II* emission at z ≳ 2
Ouchi, Masami; Blaizot, Jérémy; Garel, Thibault +17 more
Context. The circumgalactic medium (CGM) serves as a baryon reservoir that connects galaxies to the intergalactic medium and fuels star formation. The spatial distribution of the metal-enriched cool CGM has not yet been directly revealed at cosmic noon (z ≃ 2–4), as bright emission lines at these redshifts are not covered by optical integral field…
A high-energy study of the supernova remnant G296.5+10.0
Combi, J. A.; García, F.; Luque-Escamilla, P. L. +6 more
We report a detailed multi-wavelength study of the supernova remnant G296.5+10.0 using archival data from XMM-Newton and Fermi-LAT complemented with ATCA observations. In the X-ray band, we performed an adaptive smoothing on the double background subtracted images to construct an X-ray mosaic map with six individual observations. Below 2.0 keV, G2…
Efficiency of solar microflares in accelerating electrons when rooted in a sunspot
Krucker, Säm; Veronig, Astrid M.; Dickson, Ewan C. M. +3 more
Context. The spectral shape of the X-ray emission in solar flares varies with the event size, with small flares generally exhibiting softer spectra than large events, indicative of a relatively lower number of accelerated electrons at higher energies.
Aims: We investigate two microflares of GOES classes A9 and C1 (after background subtraction…
HR-GO: I. Comprehensive NLTE abundance analysis of the Cetus stream
Sestito, F.; Sitnova, T. M.; Mashonkina, L. I. +8 more
Context. Dwarf galaxy streams encode vast amounts of information essential to understanding early galaxy formation and nucleosynthesis channels. Due to the variation in the timescales of star formation history in their progenitors, stellar streams serve as 'snapshots' that record different stages of galactic chemical evolution. Aims. This study fo…
Exsolution process in white dwarf stars
Rebassa-Mansergas, Alberto; Torres, Santiago; Camisassa, Maria +1 more
Context. White dwarf stars are considered to be suitable cosmic laboratories for studying the physics of dense plasma. Furthermore, the use of white dwarf stars as cosmic clocks to date stellar populations and main sequence companions demands an appropriate understanding of the physics of white dwarfs in order to provide precise ages for these sta…
A massive multiphase plume of gas in Abell 2390's brightest cluster galaxy
Fabian, A. C.; Combes, F.; Salomé, P. +6 more
We present new ALMA CO(2-1) observations tracing $2.2 \times 10^{10}\, \textnormal {M}_{\odot }$ of molecular gas in Abell 2390's brightest cluster galaxy, where half the gas is located in a one-sided plume extending 15 kpc out from the galaxy centre. This molecular gas has a smooth and positive velocity gradient, and is receding 250 km s-1
Periodic variable A-F spectral type stars in the southern TESS continuous viewing zone. I. Identification and classification
Skarka, M.; Henzl, Z.
Aims: Our primary objective is to accurately identify and classify the variability of A-F stars in the southern continuous viewing zone of the TESS satellite. The brightness limit was set to 10 mag to ensure the utmost reliability of our results and allow for spectroscopic follow-up observations using small telescopes. We aim to compare our f…
Sublimation and infrared spectral properties of ammonium cyanide
Gerakines, Perry A.; Yarnall, Yukiko Y.; Hudson, Reggie L.
The ammonium ion (NH4+) has been suggested to be present in interstellar ices and has been observed on the surfaces of planetary bodies using infrared (IR) spectroscopy as the primary means of identification. Evidence for several ammonium salts has also been found in the dust and surface ices of comet 67P/Churyumov-Gerasimenk…