Search Publications
Assessment of the near-Sun magnetic field of the 10 March 2022 coronal mass ejection observed by Solar Orbiter
Patsourakos, S.; Georgoulis, M. K.; Nindos, A. +1 more
Aims. We estimate the near-Sun axial magnetic field of a coronal mass ejection (CME) on 10 March 2022. Solar Orbiter's in situ measurements, 7.8 degrees east of the Sun-Earth line at 0.43 AU, provided a unique vantage point, along with the WIND measurements at 0.99 AU. We determine a single power-law index from near-Sun to L1, including in situ me…
Magnetic properties of the umbral boundary during sunspot decay: Comparative study of multiple datasets
Jurčák, J.; Bello González, N.; García-Rivas, M.
Context. In recent years, the magnetic properties of the umbra-penumbra boundary of sunspots and the boundary of pores at various evolutionary stages have been characterised using datasets from different instruments. Aims. We aim to study the intrinsic differences between the intensity and vector magnetic field properties derived from Hinode/SP an…
Effects of ultrafast outflows on X-ray time lags in active galactic nuclei
Bianchi, Stefano; Kara, Erin; Tombesi, Francesco +3 more
Context. The time lag between soft (e.g., 0.3–1 keV) and hard (e.g., 1–4 keV) X-ray photons has been observed in many active galactic nuclei (AGNs) and can reveal the accretion process and geometry around supermassive black holes. High-frequency Fe K and soft lags are considered to originate from the light-travel distances between the corona and t…
Validation of the Bond et al. (2010) SDSS-derived kinematic models for the Milky Way's disk and halo stars with Gaia Data Release 3 proper motion and radial velocity data
Ivezić, Željko; Domínguez, Bruno; Chaini, Siddharth +2 more
We validate the Bond et al. (2010, ApJ, 716, 1) kinematic models for the Milky Way's disk and halo stars with Gaia Data Release 3 data. Bond et al. constructed models for stellar velocity distributions using stellar radial velocities measured by the Sloan Digital Sky Survey (SDSS) and stellar proper motions derived from SDSS and the Palomar Observ…
Investigating the nuclear properties of highly accreting active galactic nuclei with XMM-Newton
Guainazzi, M.; Vignali, C.; Piconcelli, E. +7 more
Highly accreting active galactic nuclei (AGNs) have unique features that make them ideal laboratories for studying black hole accretion physics under extreme conditions. However, our understanding of the nuclear properties of these sources is hampered by the lack of a complete systematic investigation of this AGN class in terms of their main spect…
Probing the emission mechanism and nature of the pulsating compact object in the X-ray binary SAX J1324.4−6200
Santangelo, A.; Serim, M. M.; Ducci, L. +6 more
Recently, there has been renewed interest in the Be X-ray binary (Be/XRB) SAX J1324.4−6200 because of its spatial coincidence with a variable γ-ray source detected by Fermi/LAT. To explore more thoroughly its properties, new X-ray observations were carried out in 2023 by NuSTAR, XMM-Newton, and Swift satellites, jointly covering the energy range f…
The chemical evolution of the Milky Way thin disk using solar twins
Spina, L.; Carraro, G.; Casali, G. +2 more
Aims. In this study we address whether the age-metallicity relation (AMR) deviates from the expected trend of metallicity increasing smoothly with age. We also show the presence (or absence) of two populations, as recently claimed using a relatively small dataset. Moreover, we studied the Milky Way thin disk's chemical evolution using solar twins,…
Hot bubbles of planetary nebulae with hydrogen-deficient winds. III. Formation and evolution in comparison with hydrogen-rich bubbles
Steffen, M.; Schönberner, D.
Aims: We seek to understand the evolution of Wolf-Rayet central stars by comparing the diffuse X-ray emission from their windblown bubbles with that from their hydrogen-rich counterparts with predictions from hydrodynamical models.
Methods: We simulate the dynamical evolution of heat-conducting wind-blown bubbles using our 1D radiation-h…
The Lockman-SpReSO project. Galactic flows in a sample of far-infrared galaxies
Krongold, Yair; Gallego, Jesús; Sánchez-Portal, Miguel +21 more
Context. The Lockman-SpReSO project is an optical spectroscopic survey of 956 far-infrared (FIR) objects within the Lockman Hole field limited by magnitude RC(AB) < 24.5. Fe II and Mg II absorption lines have been detected in 21 out of 456 objects with a determined spectroscopic redshift in the catalogue. The redshifts of these objec…
Spectral aging analysis of the 3C 219 double-double radio galaxy
Jamrozy, M.; Wolnik, K.; Jurusik, W.
Context. Double-double radio galaxies are characterized by intermittent jet-formation activity. The exact reasons for this behavior are not yet fully understood. Studying these objects and their environment allows us to find common characteristics and compare them with the general population of radio galaxies. 3C 219 is a well-known and thoroughly…