Search Publications
Properties of sunspot light bridges on a geometric height scale
Ruiz Cobo, B.; Asensio Ramos, A.; Esteban Pozuelo, S. +1 more
Context. Investigating light bridges (LBs) helps us comprehend key aspects of sunspots. However, few studies have analyzed the properties of LBs in terms of the geometric height, which is a more realistic perspective given the corrugation of the solar atmosphere. Aims. We aim to shed light on LBs by studying the variation in their physical propert…
CHEX-MATE: The intracluster medium entropy distribution in the gravity-dominated regime
Arnaud, M.; Pointecouteau, E.; Pratt, G. W. +26 more
We characterise the intracluster gas entropy profiles of 32 very high-mass (M500 > 7.75 × 1014 M⊙) Planck SZ-detected galaxy clusters (HIGHMz), selected from the CHEX-MATE sample, allowing us to study the intracluster medium (ICM) entropy distribution in a regime where non-gravitational effects are expected to b…
Chemo-dynamics of the stellar component of the Sculptor dwarf galaxy: I. Observed properties
Tolstoy, Eline; Thomas, Guillaume F.; Battaglia, Giuseppina +3 more
Aims. Recently, both the presence of multiple stellar chemo-kinematic components and rotation in the Sculptor dwarf spheroidal galaxy have been put into question. Therefore, we re-examine the chemo-kinematic properties of this galaxy, making use of the best spectroscopic dataset available containing both the line-of-sight velocities and metallicit…
Unveiling the shape: A multi-wavelength analysis of the galaxy clusters Abell 76 and Abell 1307
Böhringer, H.; Chon, G.; Barrena, R. +1 more
We analyse the dynamical state of the galaxy clusters Abell 76 and Abell 1307 from the optical point of view, presenting a coherent scenario that responds to the X-ray emissions observed in these structures. Our study is based on 231 and 164 spectroscopic redshifts, for the clusters A76 and A1307, respectively, obtained mostly with the Telescopio …
High-resolution X-ray spectra of the compact binary supersoft X-ray source CAL 87
Pei, Songpeng; Li, Qiang; Zhang, Xiaowan +1 more
In this study we present an analysis of the archival X-ray data of the eclipsing supersoft X-ray binary CAL 87 observed with the Chandra Advanced CCD Imaging Spectrometer (ACIS) camera and Low Energy Transmission Grating (LETG) in 2001 August and with XMM-Newton in 2003 April. The high-resolution X-ray spectra are almost unchanged on the two diffe…
Swift X-ray and UV observations of six Gaia binaries supposedly containing a neutron star
Sbarufatti, B.; Mereghetti, S.; Rea, N. +3 more
Recent observations have led to the discovery of numerous optically selected binaries containing an undetected component with mass consistent with a compact object (neutron star (NS) or white dwarf). Using the Neil Gehrels Swift Observatory, we carried out X-ray and UV observations of a small sample of these binaries. Four systems are wide (with a…
H3+ absorption and emission in local (U)LIRGs with JWST/NIRSpec: Evidence for high H2 ionization rates
Perna, Michele; Lamperti, Isabella; González-Alfonso, Eduardo +6 more
We study the 3.4 ‑ 4.4 µm fundamental rovibrational band of H3+, a key tracer of the ionization of the molecular interstellar medium (ISM), in a sample of 12 local (d < 400 Mpc) (ultra)luminous infrared galaxies ((U)LIRGs) observed with JWST/NIRSpec. The P, Q, and R branches of the band are detected in 13 out of 20 a…
Confrontation between modelled solar integrated observables and direct observations. I. Radial velocities and convective blueshift
Meunier, N.; Lagrange, A. -M.; Dumusque, X. +1 more
Context. Stellar variability strongly impacts the search for low-mass exoplanets with radial velocity techniques. Two types of planet-free time series can be used to quantify this impact: models and direct solar observations after a subtraction of the Solar System planetary contribution. Making a comparison among these approaches is necessary to i…
Population of giant planets around B stars from the first part of the BEAST survey
Helled, R.; Henning, Th.; Mayer, L. +23 more
Context. Exoplanets form from circumstellar protoplanetary disks whose fundamental properties (notably their extent, composition, mass, temperature, and lifetime) depend on the host star properties, such as their mass and luminosity. B stars are among the most massive stars and their protoplanetary disks test extreme conditions for exoplanet forma…
Chandra Survey in the AKARI deep field at the North Ecliptic Pole: Optical and near-infrared identifications of X-ray sources
Malkan, M. A.; Ohyama, Y.; Takagi, T. +17 more
Aims. We present a catalog of optical and infrared (NIR) identifications (ID) of X-ray sources in the AKARI North Ecliptic Pole (NEP) deep field detected with Chandra, covering ~0.34 deg2 and with 0.5–2 keV flux limits ranging between ~2–20 × 10‑16 erg s‑1 cm‑2. Methods. The optical/NIR counterparts of t…