Search Publications
Unveiling the origin of XMM-Newton soft proton flares: I. Design and validation of a response matrix for proton spectral analysis
Cappi, M.; Molendi, S.; Gastaldello, F. +8 more
Context. Low-energy (<300 keV) protons entering the field of view of XMM-Newton can scatter with the X-ray mirror surface and reach the focal plane. They are observed in the form of a sudden increase in the background level, the so-called soft proton flares, affecting up to 40% of the mission observing time. Soft protons can hardly be disentang…
Detection of a new sample of Galactic white dwarfs in the direction of the Small Magellanic Cloud
Arun, R.; Stalin, C. S.; Bhattacharyya, S. +7 more
Aims. In this study, we demonstrate the efficacy of the Ultraviolet Imaging Telescope (UVIT) in identifying and characterizing white dwarfs (WDs) within the Milky Way Galaxy. Methods. Leveraging the UVIT point-source catalogue towards the Small Magellanic Cloud and cross-matching it with Gaia DR3 data, we identified 43 single WDs (37 new detection…
Exploring the links between quasar winds and radio emission along the main sequence at high redshift
Marziani, P.; del Olmo, A.; Deconto-Machado, A.
Context. Despite the increasing prevalence of radio-loud (RL) sources at cosmic noon, our understanding of the underlying physics that governs the accretion disc outflows in these particular sources and its dissimilarity with radio-quiet (RQ) quasars remains somewhat limited. Aims. Disentangling the real impact of the radio-loudness and accretion …
TOI-2266 b: A keystone super-Earth at the edge of the M dwarf radius valley
Tamura, M.; Béjar, V. J. S.; Korth, J. +59 more
We validate the Transiting Exoplanet Survey Satellite (TESS) object of interest TOI-2266.01 (TIC 8348911) as a small transiting planet (most likely a super-Earth) orbiting a faint M5 dwarf (V = 16.54) on a 2.33 d orbit. The validation is based on an approach where multicolour transit light curves are used to robustly estimate the upper limit of th…
Relation between the geometric shape and rotation of Galactic globular clusters
Anderson, Richard I.; Cruz Reyes, Mauricio
We homogeneously measured the elliptical shapes of 163 globular clusters (GCs) using the on-sky distribution of their cluster members and the third data release of the ESA mission Gaia (DR3). The astrometry enables the differentiation of stars within clusters from those in the field. This feature is particularly valuable for clusters located in de…
Strong-lensing and kinematic analysis of CASSOWARY 31: Can strong lensing constrain the masses of multi-plane lenses?
Grillo, C.; Wang, H.; Christensen, L. +4 more
We present a mass measurement for the secondary lens along the line of sight (LoS) from the multi-plane strong lens modeling of the group-scale lens CASSOWARY 31 (CSWA 31). The secondary lens at redshift z = 1.49 is a spiral galaxy well aligned along the LoS with the main lens at z = 0.683. Using the MUSE integral-field spectroscopy of this spiral…
Protoplanetary and debris disks in the η Chamaeleontis Association. A submillimeter survey obtained with APEX/LABOCA observations
Wolf, S.; Henning, Th.; Lawson, W. A. +7 more
Context. Nearby associations are ideal regions to study coeval samples of protoplanetary and debris disks down to late M-type stars. Those aged 5-10 Myr, where most of the disk should have already dissipated forming planets, are of particular interest.
Aims: We present the first complete study of both protoplanetary and debris disks in a youn…
Towards a complete census of luminous Compton-thick active galactic nuclei in the Local Universe
Georgantopoulos, I.; Gandhi, P.; Akylas, A. +2 more
X-ray surveys provide the most efficient means for the detection of active galactic nuclei (AGNs). However, they do face difficulties in detecting the most heavily obscured Compton-thick AGNs. The BAT detector on board the Gehrels/Swift mission, operating in the very hard 14–195 keV band, has provided the largest samples of Compton-thick AGN in th…
Three new Galactic globular cluster candidates: FSR1700, Teutsch67, and CWNU4193
Minniti, D.; Alonso-García, J.; Gómez, M. +3 more
The VISTA Variables in the Via Láctea Extended Survey (VVVX) enables exploration of previously uncharted territories within the inner Milky Way (MW), particularly those obscured by stellar crowding and intense extinction. Our objective is to identify and investigate new star clusters to elucidate their intrinsic characteristics. Specifically, we a…
The relation between magnetic field inclination and the apparent motion of penumbral grains
Sobotka, Michal; Jurčák, Jan; Castellanos Durán, Juan Sebastián +1 more
Context. The bright heads of penumbral filaments, penumbral grains (PGs), show apparent horizontal motions inward, toward the umbra, or outward, away from the umbra.
Aims: We aim to ascertain statistically whether the direction of PGs' apparent motion is related to the inclination of the surrounding magnetic field.
Methods: We used spect…