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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2023

Seeking the growth of the first black hole seeds with JWST

Alessandro Trinca
  • Fonction : Auteur
Raffaella Schneider
  • Fonction : Auteur
Roberto Maiolino
  • Fonction : Auteur
Rosa Valiante
  • Fonction : Auteur
Luca Graziani
  • Fonction : Auteur
Marta Volonteri

Résumé

Surveys with the James Webb Space Telescope (JWST) will have the sensitivity to explore the assembly history of the first nuclear black holes (BHs), as they grow in mass from the scale of the first heavy BH seeds ($\rm M_{BH}\sim 10^4 - 10^6 M_\odot$), to the supermassive black holes (SMBHs, $\rm M_{BH} > 10^8 M_\odot$) powering luminous quasars out to $z \sim 7.5$. In this paper we provide predictions for the number of accreting BHs that would be observable with planned JWST surveys at $5 \le z < 15$. We base our study on the recently developed Cosmic Archaeology Tool (CAT), which allows us to model BH seeds formation and growth, while being consistent with the general population of AGNs and galaxies observed at $4 \le z \le 7$. We find that JWST planned surveys will provide a complementary view on the active BH population at $z > 5$, with JADES-Medium/-Deep being capable of detecting the numerous BHs that populate the faint-end of the distribution, COSMOS-Web sampling a large enough area to detect the rarest brightest systems, and CEERS/PRIMER bridging the gap between these two regimes. The relatively small field of view of the above surveys preferentially selects BHs with masses $\rm 6 \leq Log(M_{BH}/M_\odot) < 8$ at $7 \le z < 10$, residing in relatively metal poor galaxies ($\rm Log(Z/Z_\odot) \ge -2$). At $z \ge 10$, only JADES-Deep will have the sensitivity to detect growing BHs with masses $\rm 4 \leq Log(M_{BH}/M_\odot) < 6$, hosted in even more metal poor environments ($\rm -3 \leq Log(Z/Z_\odot) < -2$). In our model, the latter population corresponds to heavy BH seeds formed by the direct collapse of super-massive stars in their earliest phases of mass growth. Detecting these systems would provide unvaluable insights on the nature and early growth of the first BH seeds.
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hal-03862320 , version 1 (22-04-2024)

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Alessandro Trinca, Raffaella Schneider, Roberto Maiolino, Rosa Valiante, Luca Graziani, et al.. Seeking the growth of the first black hole seeds with JWST. Monthly Notices of the Royal Astronomical Society, 2023, 519 (3), pp.4753-4764. ⟨10.1093/mnras/stac3768⟩. ⟨hal-03862320⟩
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