Search Publications
Rapid evolution of the recurrence time in the repeating partial tidal disruption event eRASSt J045650.3−203750
Merloni, A.; Rau, A.; Miller-Jones, J. C. A. +8 more
In this letter, we present the results from subsequent X-ray and UV observations of the nuclear transient eRASSt J045650.3−203750 (hereafter, J0456−20). We detected five repeating X-ray and UV flares from J0456−20, marking it as one of the most promising repeating partial tidal disruption event (pTDE) candidates. More importantly, we also found ra…
Multimessenger search for electrophilic feebly interacting particles from supernovae
Carenza, Pierluca; Balaji, Shyam; Luque, Pedro De la Torre
We study MeV-scale electrophilic feebly interacting particles (FIPs), that may be abundantly produced in supernova explosions, escape the star and decay into electrons and positrons. This exotic injection of leptons in the Milky Way leaves an imprint in both photon and cosmic ray fluxes. Specifically, positrons lose energy and annihilate almost at…
Comparing jet-shaped point symmetry in cluster cooling flows and supernovae
Soker, Noam
I point out similarities between point-symmetric X-ray morphologies in cooling flow groups and clusters of galaxies, which are observed to be shaped by jets, and point-symmetric morphologies of eight core-collapse supernova (CCSN) remnants. I identify these similarities by qualitative eye inspection of multiwavelength images. I use these similarit…
Protoclusters as drivers of stellar mass growth in the early Universe, a case study: Taralay - a massive protocluster at z 4.57
Shen, Lu; Giavalisco, Mauro; Hathi, Nimish +26 more
Simulations predict that the galaxy populations inhabiting protoclusters may contribute considerably to the total amount of stellar mass growth of galaxies in the early universe. In this study, we test these predictions observationally, using the Taralay protocluster (formerly PCl J1001+0220) at z ~ 4.57 in the COSMOS field. With the Charting Clus…
A "MeerKAT-meets-LOFAR" study of the complex multi-component (mini-)halo in the extreme sloshing cluster Abell 2142
Rossetti, M.; Balboni, M.; Botteon, A. +7 more
Context. Clusters of galaxies are known to be turbulent environments, whether they are merging systems where turbulence is injected via the conversion of gravitational potential energy into the intracluster medium (ICM), or whether they are relaxed systems in which small-scale core sloshing is occurring within the potential well. In many such syst…
ASTRODEEP-JWST: NIRCam-HST multi-band photometry and redshifts for half a million sources in six extragalactic deep fields
Kartaltepe, J. S.; Dickinson, M.; Ferguson, H. C. +52 more
Aims. We present a set of photometric catalogues primarily aimed at providing the community with a comprehensive database for the study of galaxy populations in the high-redshift Universe. The set gathers data from eight JWST NIRCam observational programs, targeting the Abell 2744 (GLASS-JWST, UNCOVER, DDT2756, and GO3990), EGS (CEERS), COSMOS and…
The enigmatic origin of two dormant BH binaries: Gaia BH1 and Gaia BH2
Kotko, I.; Belczynski, K.; Banerjee, S.
The two systems, namely, Gaia BH1 and Gaia BH2, that have been confirmed as dormant (i.e. no X-ray emission detected) black hole (BH) - low-mass star binaries in the latest Gaia mission data release are intriguing in the context of their formation and evolution. Both systems consist of
Dust in Little Red Dots
Casey, Caitlin M.; Long, Arianna S.; McKinney, Jed +5 more
JWST has revealed a ubiquitous population of "little red dots" (LRDs) at z ≳ 4, selected via their red rest-frame optical emission and compact morphologies. They are thought to be reddened by dust, whether in tori of active galactic nuclei (AGNs) or the interstellar medium, though none have direct dust detections to date. Informed by the average c…
Properties of the brightest young stellar clumps in extremely lensed galaxies at redshifts 4 to 5
Richard, Johan; Adamo, Angela; Messa, Matteo +2 more
We study the populations of stellar clumps in three high-redshift galaxies, at z = 4.92, 4.88, and 4.03, gravitationally lensed by the foreground galaxy clusters MS1358, RCS0224, and MACS0940, respectively. The lensed galaxies consist of multiple counter-images with large magnifications, mostly above $\mu > 5$ and in some cases reaching $\mu &g…
In This Day and Age: An Empirical Gyrochronology Relation for Partially and Fully Convective Single Field Stars
Angus, Ruth; Foreman-Mackey, Daniel; Lu, Yuxi(Lucy) +1 more
Gyrochronology, the field of age dating stars using mainly their rotation periods and masses, is ideal for inferring the ages of individual main-sequence stars. However, due to the lack of physical understanding of the complex magnetic fields in stars, gyrochronology relies heavily on empirical calibrations that require consistent and reliable ste…