Search Publications
The eROSITA Final Equatorial Depth Survey (eFEDS). X-ray catalogue
Finoguenov, A.; Haberl, F.; Schrabback, T. +35 more
Context. The eROSITA X-ray telescope on board the Spectrum-Poentgen-Gamma (SPG) observatory combines a large field of view and a large collecting area in the energy range between ~0.2 and ~8.0 keV. This gives the telescope the capability to perform uniform scanning observations of large sky areas.
Aims: SRG/eROSITA performed scanning observat…
The eROSITA Final Equatorial-Depth Survey (eFEDS). Identification and characterization of the counterparts to point-like sources
Finoguenov, A.; Georgakakis, A.; Salvato, M. +40 more
Context. In November 2019, eROSITA on board of the Spektrum-Roentgen-Gamma (SRG) observatory started to map the entire sky in X-rays. After the four-year survey program, it will reach a flux limit that is about 25 times deeper than ROSAT. During the SRG performance verification phase, eROSITA observed a contiguous 140 deg2 area of the s…
The MeerKAT Galaxy Cluster Legacy Survey. I. Survey Overview and Highlights
Tasse, C.; Heywood, I.; Camilo, F. +148 more
MeerKAT's large number (64) of 13.5 m diameter antennas, spanning 8 km with a densely packed 1 km core, create a powerful instrument for wide-area surveys, with high sensitivity over a wide range of angular scales. The MeerKAT Galaxy Cluster Legacy Survey (MGCLS) is a programme of long-track MeerKAT L-band (900−1670 MHz) observations of 115 galaxy…
The Planck clusters in the LOFAR sky. I. LoTSS-DR2: New detections and sample overview
Simionescu, A.; Zhang, X.; Di Gennaro, G. +23 more
Context. Relativistic electrons and magnetic fields permeate the intra-cluster medium (ICM) and manifest themselves as diffuse sources of synchrotron emission observable at radio wavelengths, namely radio halos and radio relics. Although there is broad consensus that the formation of these sources is connected to turbulence and shocks in the ICM, …
MeerKAT view of the diffuse radio sources in Abell 3667 and their interactions with the thermal plasma
Finoguenov, A.; Brüggen, M.; de Gasperin, F. +11 more
Context. During their lifetimes, galaxy clusters grow through the accretion of matter from the filaments of the large-scale structure and from mergers with other clusters. These mergers release a large amount of energy into the intracluster medium (ICM) through merger shocks and turbulence. These phenomena are associated with the formation of radi…
Hα and He I absorption in HAT-P-32 b observed with CARMENES. Detection of Roche lobe overflow and mass loss
Schmitt, J. H. M. M.; López-Puertas, M.; Nagel, E. +22 more
We analyze two high-resolution spectral transit time series of the hot Jupiter HAT-P-32 b obtained with the CARMENES spectrograph. Our new XMM-Newton X-ray observations of the system show that the fast-rotating F-type host star exhibits a high X-ray luminosity of 2.3 × 1029 erg s−1 (5-100 Å), corresponding to a flux of 6.9 × …
The complex time and energy evolution of quasi-periodic eruptions in eRO-QPE1
Salvato, M.; Buchner, J.; Nandra, K. +8 more
Quasi-periodic eruptions (QPEs) are recurrent X-ray bursts found in the nuclei of low-mass galaxies. Their trigger mechanism is still unknown, but recent models involving one or two stellar-mass companions around the central massive (≈105 − 106 M⊙) black hole have gathered significant attention. While these models …
A tentative detection of He I in the atmosphere of GJ 1214 b
Sánchez-López, A.; López-Puertas, M.; Nagel, E. +27 more
The He I λ10833 Å triplet is a powerful tool for characterising the upper atmosphere of exoplanets and tracing possible mass loss. Here, we analysed one transit of GJ 1214 b observed with the CARMENES high-resolution spectrograph to study its atmosphere via transmission spectroscopy around the He I triplet. Although previous studies using lower re…
Constraints on dark matter self-interaction from the internal density profiles of X-COP galaxy clusters
Pointecouteau, E.; Eckert, D.; Ettori, S. +4 more
The fundamental properties of the postulated dark matter (DM) affect the internal structure of gravitationally bound structures. In the cold dark matter paradigm, DM particles interact only via gravity. Their distribution is well represented by an Einasto profile with shape parameter α ≈ 0.18 in the smallest dwarf galaxies or the most massive gala…
Radio footprints of a minor merger in the Shapley Supercluster: From supercluster down to galactic scales
Di Gennaro, G.; Diego, J. M.; Rossetti, M. +29 more
Context. The Shapley Supercluster (⟨z⟩≈0.048) contains several tens of gravitationally bound clusters and groups, making it an ideal subject for radio studies of cluster mergers.
Aims: We used new high sensitivity radio observations to investigate the less energetic events of mass assembly in the Shapley Supercluster from supercluster down to…