Search Publications
Losing a minute every two years: SRG X-ray view of the rapidly accelerating X-ray pulsar SXP 1323
Tsygankov, S. S.; Lutovinov, A. A.; Mereminskiy, I. A. +4 more
The source SXP 1323 is a peculiar high-mass X-ray binary located in the Small Magellanic Cloud. It is renowned for its rapid spin-up. We investigate for the first time broadband X-ray properties of SXP 1323 as observed by the Mikhail Pavlinsky ART-XC and eROSITA telescopes on board the Spectrum-Roentgen-Gamma observatory. Using ART-XC and eROSITA …
The strange case of Na I in the atmosphere of HD 209458 b. Reconciling low- and high-resolution spectroscopic observations
Pallé, E.; Casasayas-Barris, N.; Micela, G. +3 more
Aims: We aim to investigate the origin of the discrepant results reported in the literature about the presence of Na I in the atmosphere of HD 209458 b, based on low- and high-resolution transmission spectroscopy.
Methods: We generated synthetic planetary atmosphere models and we compared them with the transmission light curves and spect…
The resolved jet of 3C 273 at 150 MHz. Sub-arcsecond imaging with the LOFAR international baselines
Quinn, J.; Morabito, L. K.; Sweijen, F. +6 more
Context. Since its discovery in 1963, 3C 273 has become one of the most widely studied quasars with investigations spanning the electromagnetic spectrum. While much has therefore been discovered about this historically notable source, its low-frequency emission is far less well understood. Observations in the megahertz (MHz) regime have traditiona…
Towards a fully consistent Milky Way disk model. V. The disk model for 4-14 kpc
Just, A.; Sysoliatina, K.
Context. The semi-analytic Just-Jahreiß (JJ) model of the Galactic disk is a flexible tool for stellar population synthesis with a fine age resolution of 25 Myr. The model has recently been calibrated in the solar neighbourhood against the Gaia DR2 stars. We have identified two star-formation bursts within the last ∼4 Gyr of the local star-formati…
Radiative losses in the chromosphere during a C-class flare
Leenaarts, J.; de la Cruz Rodríguez, J.; Díaz Baso, C. J. +2 more
Context. Solar flares release an enormous amount of energy (∼1032 erg) into the corona. A substantial fraction of this energy is transported to the lower atmosphere, which results in chromospheric heating. The mechanisms that transport energy to the lower solar atmosphere during a flare are still not fully understood.
Aims: We aim …
MUSE spectroscopic observations of the young massive cluster NGC 1850
Bragaglia, A.; D'Orazi, V.; Carretta, E. +4 more
Context. The double cluster NGC 1850 in the Large Magellanic Cloud is the nearest young massive cluster of the Local Group with a mass similar to those of Galactic globular clusters. Recent studies have revealed an extended morphology of its main-sequence turn-off (MSTO), which can be interpreted as a spread in either age or internal rotation. In …
The miniJPAS Survey: Detection of the double-core Lyα morphology for two high-redshift QSOs
Diego, J. M.; Hernán-Caballero, A.; Mendes de Oliveira, C. +30 more
Context. The Lyα emission is an important tracer of neutral gas in a circum-galactic medium (CGM) around high-z quasi-stellar objects (QSOs). The origin of Lyα emission around QSOs is still under debate, bringing on significant implications for galaxy formation and evolution.
Aims: In this paper, we study Lyα nebulae around two high redshift …
X-ray spectral-timing variability of 1A 0535+262 during the 2020 giant outburst
Zhang, S.; Reig, P.; Ma, R. C. +3 more
Context. The Be/X-ray binary 1A 0535+262 underwent a giant X-ray outburst in November 2020, peaking at ∼1 × 1038 erg s−1 (1-100 keV, 1.8 kpc), the brightest outburst recorded for this source so far. The source was monitored over two orders of magnitude in luminosity with Insight-HXMT, which allowed us to probe the X-ray varia…
Fitting XMM-Newton observations of the AXP 1RXS J170849.0−400910 with four magnetar surface emission models, and predictions for X-ray polarization observations with IXPE
Mereghetti, Sandro; Turolla, Roberto; Rigoselli, Michela +2 more
Context. Phase-resolved spectral and spectropolarimetric X-ray observations of magnetars present us with the opportunity to test models of the origin of the X-ray emission from these objects, and to constrain the properties of the neutron star surface and atmosphere.
Aims: Our first aim is to use archival XMM-Newton observations of the magnet…
Updated orbital monitoring and dynamical masses for nearby M-dwarf binaries
Henning, Thomas; Brandner, Wolfgang; Calissendorff, Per +26 more
Young M-type binaries are particularly useful for precise isochronal dating by taking advantage of their extended pre-main sequence evolution. Orbital monitoring of these low-mass objects becomes essential in constraining their fundamental properties, as dynamical masses can be extracted from their Keplerian motion. Here, we present the combined e…