Search Publications
INTEGRAL/IBIS polarization detection in the hard and soft intermediate states of Swift J1727.8−1613
Rodriguez, J.; Wilms, J.; Laurent, P. +5 more
Aims: Soft γ-ray emission (100 keV-10 MeV) has previously been detected in the hard state of several microquasars. In some sources, this emission was found to be highly polarized and was suggested to be emitted at the base of the jet. Until now, no γ-ray polarization had been found in any other state.
Methods: Using INTEGRAL/IBIS, we stu…
ViCTORIA project: The LOFAR view of environmental effects in Virgo cluster star-forming galaxies
Boselli, A.; Brüggen, M.; Ignesti, A. +5 more
Context. Environmental effects such as ram pressure stripping (RPS) shape the evolution of galaxies in dense regions.
Aims: We used the nearby Virgo cluster as a laboratory to study the environmental effects on the nonthermal components of star-forming galaxies.
Methods: We constructed a sample of 17 RPS galaxies in the Virgo cluster and…
XLSSC 122 caught in the act of growing up: Spatially resolved SZ observations of a z = 1.98 galaxy cluster
Bond, J. R.; Partridge, B.; Popping, G. +18 more
Context. How protoclusters evolved from sparse galaxy overdensities to mature galaxy clusters is still not well understood. In this context, detecting and characterizing the hot intracluster medium (ICM) at high redshifts (z ∼ 2) is key to understanding how the continuous accretion from the filamentary large-scale structure and the mergers along i…
The SRG/eROSITA All-Sky Survey: X-ray beacons at late cosmic dawn
Salvato, M.; Buchner, J.; Nandra, K. +12 more
Context. The Spektrum-Roentgen-Gamma (SRG)/extended Roentgen Survey with an Imaging Telescope Array (eROSITA) All-Sky Survey (eRASS) is expected to contain ∼100 quasars that emitted their light when the universe was less than a billion years old, that is, at z > 5.6. By selection, these quasars populate the bright end of the active galactic nuc…
Assessing the robustness of the Galactic rotation curve inferred from the Jeans equations using Gaia DR3 and cosmological simulations
Laporte, Chervin F. P.; Helmi, Amina; Antoja, Teresa +2 more
Context. Several authors have recently applied Jeans modelling to Gaia-based datasets to infer the circular velocity curve for the Milky Way. These works have consistently found evidence for a continuous decline in the rotation curve beyond ~15 kpc, which may indicate the existence of a light dark matter (DM) halo. Aims. Using a large sample of Ga…
High-energy spectra of LTT 1445A and GJ 486 reveal flares and activity
France, K.; Buchhave, L. A.; Kreidberg, L. +19 more
The high-energy radiative output, from the X-ray to the ultraviolet, of exoplanet host stars drives photochemical reactions and mass loss in the upper regions of planetary atmospheres. In order to place constraints on the atmospheric properties of the three closest terrestrial exoplanets transiting M dwarfs, we observe the high-energy spectra of t…
Unveiling the 3D structure of nova shells with MUSE: The case of RR Pic
Schmidtobreick, L.; Celedón, L.; Tappert, C. +1 more
Context. Nova eruptions occur in cataclysmic variables when enough material has been accreted onto the surface of the white dwarf primary. As a consequence, the material that has been accumulated until then is expelled into the interstellar medium, forming an expanding nova shell around the system. Understanding the physical process that shapes th…
The AstraLux-TESS high spatial resolution imaging survey. Search for stellar companions of 215 planet candidates from TESS
Montesinos, B.; Mendigutía, I.; Huélamo, N. +6 more
Context. Chance-aligned sources or blended companions can cause false positives in planetary transit detections or simply bias the determination of the candidate properties. In the era of high-precision space-based photometers, the need for high spatial resolution images has been demonstrated to be critical for validating and confirming transit si…
High-speed stars. II. An unbound star, young stars, bulge metal-poor stars, and Aurora candidates
Bonifacio, P.; Caffau, E.; Spite, M. +6 more
Context. The data from the Gaia satellite led us to revise our conception of the Galaxy structure and history. Hitherto unknown components have been discovered and a deep re-thinking of what the Galactic halo is in progress.
Aims: We selected from the Gaia catalogue stars with extreme transverse velocities with respect to the Sun (|VT
Searching for X-ray counterparts of unassociated Fermi-LAT sources and rotation-powered pulsars with SRG/eROSITA
Becker, Werner; Mayer, Martin G. F.
Context. The latest source catalog of the Fermi-LAT telescope contains more than 7000 γ-ray sources at giga-electronvolt energies, with the two dominant source classes thought to be blazars and rotation-powered pulsars. Despite continuous follow-up efforts, around 2600 sources have no known multiwavelength association.
Aims: Our target is the…