Search Publications
Euclid preparation: LVIII. Detecting extragalactic globular clusters in the Euclid survey
Cimatti, A.; Ilbert, O.; Baccigalupi, C. +270 more
Extragalactic globular clusters (EGCs) are an abundant and powerful tracer of galaxy dynamics and formation, and their own formation and evolution is also a matter of extensive debate. The compact nature of globular clusters means that they are hard to spatially resolve and thus study outside the Local Group. In this work we have examined how well…
Euclid: A complete Einstein ring in NGC 6505
Altieri, B.; Aussel, H.; Cimatti, A. +195 more
We report the discovery of a complete Einstein ring around the elliptical galaxy NGC 6505, at z = 0.042. This is the first strong gravitational lens discovered in Euclid and the first in an NGC object from any survey. The combination of the low redshift of the lens galaxy, the brightness of the source galaxy (IE = 18.1 lensed, IE
LOFAR high-band antenna observations of the Perseus cluster: The discovery of a giant radio halo
Brunetti, G.; Shimwell, T. W.; Gastaldello, F. +13 more
The Perseus cluster is the brightest X-ray cluster in the sky and is known as a cool-core galaxy cluster. Being a very nearby cluster, it has been extensively studied. This has provided a comprehensive view of the physical processes that operate in the intracluster medium (ICM), including feedback from the active galactic nucleus (AGN) 3C 84 and m…
Euclid: High-precision imaging astrometry and photometry from Early Release Observations: I. Internal kinematics of NGC6397 by combining Euclid and Gaia data
Altieri, B.; Cimatti, A.; Baccigalupi, C. +175 more
The instruments at the focus of the Euclid space observatory offer superb, diffraction-limited imaging over an unprecedented (from space) wide field of view of 0.57 deg2. This exquisite image quality has the potential to produce high-precision astrometry for point sources once the undersampling of Euclid's cameras is taken into account …
Euclid: The rb‑M* relation as a function of redshift: I. The 5 × 109 M⊙ black hole in NGC 1272
Cimatti, A.; Baccigalupi, C.; Burigana, C. +148 more
Core ellipticals, which are massive early-type galaxies with almost constant inner surface brightness profiles, are the result of dry mergers. During these events, a binary black hole (BBH) is formed, destroying the original cuspy central regions of the merging objects and scattering stars that are not on tangential orbits. The size of the emergin…