High Energy Astrophysics and Cosmology in the era of all-sky surveys

Session

Promoridial black holes, sky surveys and Cosmology

11 Oct 2024, 10:20

81. BIack Holes and Massive Galaxies in the Early Universe

Felix Mirabel

11/10/2024, 10:20

Invited

Recent observations with the JWST and ALMA identified at z > 10 massive star forming galaxies of up to 1011 solar masses that are already quench at z > 3. This very early formation and rapid evolution of massive galaxies produced great surprise, because it is difficult to reconcile with standard $\Lambda$CDM predictions alone. I will show that BH feedback regulate the formation and evolution...

84. Formation of the first halos, galaxies and magnetic fields

Tatiana Larchenkova

11/10/2024, 11:20

Regular

Cosmic objects with magnetic fields (quasars, AGNs) are observed at redshifts z≥7 and more (for instance, for z=10.073±0.002) indicates the early creation of magnetic fields. The observations of the cosmic telescope JWST show that the first galaxies were formed at redshifts z$\simeq$15 - 20. The early formation of galaxies creates favourable conditions for high impact of the Compton...

51. Primordial Black Holes - Positivist Perspective and Quantum Quiddity

Florian Kühnel

11/10/2024, 11:40

Invited

Primordial black holes are black holes that may have formed in the early Universe. Their masses potentially span a range from as low as the Planck mass up to many orders of magnitude above the solar mass. This, in particular, includes those black holes recently discovered by LIGO/Virgo/KAGRA, and (part of) these may conceivably be of primordial origin. After a general introduction on...

28. The Hubble Tension and Primordial Magnetic Fields

Levon Pogosian

11/10/2024, 12:10

Regular

The Hubble tension hints at a missing ingredient in our model describing the universe around the epoch of recombination. A stochastic magnetic field, if present in the plasma prior to last scattering, would induce baryon inhomogeneities and speed up the recombination process, reducing the sound horizon at last scattering and potentially helping to relieve the Hubble tension. Intriguingly, the...

46. Lower limit on dark matter mass from phase space density in dwarf galaxies

Dmitry Gorbunov (Russian Academy of Sciences (RU))

11/10/2024, 12:30

Regular

Brief overview and new results

32. Change in the brightness of the cosmic X-ray, soft gamma-ray and radio background toward clusters of galaxies

Sergei Grebenev (Space Research Institute)

11/10/2024, 15:00

Regular

We show that Compton scattering by electrons of the hot intergalactic gas in galaxy clusters should lead to peculiar distortions of the cosmic background X-ray and soft gamma-ray radiation - an increase in its brightness at energies smaller than 60-100 keV and a drop at higher energies. In the cluster frame the maximum of the background decrease occurs at ~500-600 keV due to the recoil effect....

58. The halo-galaxy link at high redshift JWST galaxies

Adi Nusser

Solicited

The evolution of massive halos at high redshifts (z>9) is examined using constrained N-body simulations. The simulations are used to establish the relationship between the star formation rate and halo mass. A simple model based on the local (z=0) star formation is shown to account for the mildly elevated star formation rate at high redshifts.