Search Publications
eROSITA studies of the Carina nebula
Sasaki, Manami; Pühlhofer, Gerd; Tsuge, Kisetsu +4 more
Context. During the first four all-sky surveys eRASS:4, which was carried out from December 2019 to 2021, the extended Roentgen Survey with an Imaging Telescope Array (eROSITA) on board the Spektrum-Roentgen-Gamma (Spektr-RG, SRG) observed the Galactic H II region, the Carina nebula.
Aims: We analysed the eRASS:4 data to study the distributio…
An X-ray high-frequency quasi-periodic oscillation in NGC 1365
Zhang, P.; Chang, Z.; Yan, J. Z. +4 more
This study presents the detection of a high-frequency quasi-periodic oscillation (QPO) in the Seyfert galaxy NGC 1365 based on observational data obtained by XMM-Newton in January 2004. Utilizing the weighted wavelet Z-transform (WWZ) and Lomb-Scargle periodogram (LSP) methods, a QPO signal is identified at a frequency of 2.19 × 10‑4 Hz…
Estimates of (convective core) masses, radii, and relative ages for ∼14 000 Gaia-discovered gravity-mode pulsators monitored by TESS
Aerts, Conny; Van Reeth, Timothy; Hey, Daniel +1 more
Context. Gravito-inertial asteroseismology saw its birth from the 4-year-long light curves of rotating main-sequence stars assembled by the Kepler space telescope. High-precision measurements of internal rotation and mixing are available for about 600 stars of intermediate mass so far that are used to challenge the state-of-the-art stellar structu…
The onset of stellar multiplicity in massive star formation: A search for low-mass companions of massive young stellar objects with L′-band adaptive optics imaging
Pauwels, T.; de Wit, W. -J.; Sana, H. +3 more
Context. Given the high incidence of binaries among mature field massive stars, it is clear that multiplicity is an inevitable outcome of high-mass star formation. Understanding how massive multiples form requires the study of the birth environments of massive stars, covering the innermost to outermost regions.
Aims: We aim to detect and char…
First measurement of the triaxiality of the inner dark matter halo of the Milky Way
Helmi, Amina; Woudenberg, Hanneke C.
Context. Stellar streams are particularly sensitive probes of the mass distribution of galaxies. Aims. In this work, we focus on the Helmi streams (HS), the remnants of an accreted dwarf galaxy orbiting the inner Milky Way. We examined their peculiar dynamical properties in depth, and used these to provide tight constraints on the Galactic potenti…
Wolf 327b: A new member of the pack of ultra-short-period super-Earths around M dwarfs
Nagel, E.; Amado, P. J.; Caballero, J. A. +52 more
Planets with orbital periods shorter than 1 day are rare and have formation histories that are not completely understood. Small (Rp < 2 R⊕) ultra-short-period (USP) planets are highly irradiated, probably have rocky compositions with high bulk densities, and are often found in multi-planet systems. Additionally, USP planet…
CHEX-MATE: CLUster Multi-Probes in Three Dimensions (CLUMP-3D). I. Gas analysis method using X-ray and Sunyaev-Zel'dovich effect data
Lovisari, Lorenzo; Umetsu, Keiichi; Okabe, Nobuhiro +23 more
Galaxy clusters are the products of structure formation through myriad physical processes that affect their growth and evolution throughout cosmic history. As a result, the matter distribution within galaxy clusters, or their shape, is influenced by cosmology and astrophysical processes, in particular the accretion of new material due to gravity. …
Supermassive Black Hole Winds in X-rays: SUBWAYS. III. A population study on ultra-fast outflows
Maiolino, R.; Merloni, A.; Fiore, F. +44 more
The detection of blueshifted absorption lines likely associated with ionized iron K-shell transitions in the X-ray spectra of many active galactic nuclei (AGNs) suggests the presence of a highly ionized gas outflowing with mildly relativistic velocities (0.03c-0.6c) named ultra-fast outflow (UFO). Within the SUBWAYS project, we characterized these…
Observed seasonal changes in Martian hydrogen chloride explained by heterogeneous chemistry
Montmessin, Franck; Trokhimovskiy, Alexander; Korablev, Oleg +7 more
Aims: The aim of this work is to show that the seasonal changes and vertical distribution profiles of hydrogen chloride (HCl) on Mars, as observed by the ExoMars Trace Gas Orbiter, are consistent with the production of gas-phase chlorine atoms from airborne dust and a subsequent rapid uptake of HCl onto water ice particles.
Methods: A 1D…
Numerous bidirectionally propagating plasma blobs near the reconnection site of a solar eruption
Chen, Wei; Tian, Hui; Su, Yang +7 more
A current sheet is a common structure involved in solar eruptions. However, it is observed in a minority of the events, and the physical properties of its fine structures during a solar eruption are rarely investigated. Here, we report an on-disk observation that displays 108 compact, circular, or elliptic bright structures, presumably plasma blob…