2021/09/17 by N. Cappelluti, Nico Cappelluti, Günther Hasinger +2 · 1 voice
Physics and Astronomy · #Astronomy #Astrophysics #Black hole (networking) #Cold dark matter #Cosmology and Gravitation Theories #Dark matter #Dark matter halo #Galaxies: Formation, Evolution, Phenomena #Galaxy #Halo #Physics #Primordial black hole #Radio Astronomy Observations and Technology #Redshift #Reionization #Solar mass #Spin-flip #Star formation #astro-ph.CO #astro-ph.HE
paper · pdf · doi:10.3847/1538-4357/ac332d
32 pages, 20 figures, accepted by ApJ on 10/22/2021
arxiv published 2021/09/17 · arxiv created 2021/12/21 · openalex publication_date 2022/02/01 · openalex created_date 2022/03/02 · arxiv updated 2022/03/09 · openalex updated_date 2026/08/05
We explore the observational implications of a model in which primordial black holes (PBHs) with a broad birth mass function ranging in mass from a fraction of a solar mass to ∼106 M\odot, consistent with current observational limits, constitute the dark matter component in the Universe. The formation and evolution of dark matter and baryonic matter in this PBH-\LambdaCDM~Universe are presented. In this picture, PBH DM mini-halos collapse earlier than in standard \LambdaCDM, baryons cool to form stars at z∼15-20, and growing PBHs at these early epochs start to accrete through Bondi capture. The volume emissivity of these sources peaks at z∼20 and rapidly fades at lower redshifts. As a consequence, PBH DM could also provide a channel to make early black hole seeds and naturally account for the origin of an underlying dark matter halo - host galaxy and central black hole connection that manifests as the M\rm bh-σ correlation. To estimate the luminosity function and contribution to integrated emission power spectrum from these high-redshift PBH DM halos, we develop a Halo Occupation Distribution (HOD) model. In addition to tracing the star formation and reionizaton history, it permits us to evaluate the Cosmic Infrared and X-ray Backgrounds (CIB and CXB). We find that accretion onto PBHs/AGN successfully accounts for the detected backgrounds and their cross-correlation, with the inclusion of an additional IR stellar emission component. Detection of the deep IR source count distribution by the JWST could reveal the existence of this population of high-redshift star-forming and accreting PBH DM.