H2020Индивидуална стипендия2018–2020

darkBHgrowth · Shedding light on the dark supermassive black hole growth in the early Universe

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2018-10-01 → 2020-09-30
Финансиране от ЕС: 173 076 €
Участници: 1
Схема: MSCA-IF-EF-ST

Линиите свързват координатора с партньорите.

Накратко на български

Свързаността между супермасивните черни дупки и галактиките в ранната Вселена се анализира чрез процеси като сблъсъци между галактики. Това помага да се разбере как активността на черните дупки влияе върху раждането на нови звезди и еволюцията на галактиките.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Shedding light on the dark supermassive black hole growth in the early Universe

The MC project "Shedding light on the dark supermassive black hole growth in the early Universe" aims to investigate the interplay between active supermassive black holes (SMBHs) and galaxies since the very early stages of their growth. The feeding, feedback and cosmic growth of active galactic nuclei (AGN) must have been much more effective in the early Universe than today. However, it is yet unclear if SMBH accretion is primarily triggered by violent galaxy-galaxy mergers or via secular processes. Another open issue is whether AGN and star formation activity proceed in lockstep in all types of galaxies and at all cosmic epochs or not. In addition, no clues on the role of radio (i.e. mechanical) AGN activity in enhancing or suppressing star formation exists at redshift z>1. It is crucial to address these open questions for advancing our understanding of the role played by AGN feedback in shaping the subsequent evolution of galaxies. Previous studies focusing on these issues have selected AGN and galaxies at particular wavelengths, and therefore biased towards a specific population. Tracing all different phases of SMBH-galaxy growth requires to make a step forward and study an unbiased sample of distant galaxies in a truly multi-wavelength approach, which is the main topic of the proposed research project. Another major limitation in previous studies of AGN-galaxy evolution was the poor reliability of star formation rate (SFR) estimates. Until now, the most robust estimates have been obtained from mid- and far-infrared imaging, which can be strongly affected by blending issues due to poor angular resolution, especially at high redshft. For the first time, it is now possible to overcome this roadblock and infer de-blended SFR measurements with unprecedented accuracy, as part of the present project. A novel combination of deep infrared & radio data has been analysed to infer AGN and galaxy properties with unprecedented accuracy. The main objectives of this comprehensive work have been: (i) to explore the incidence and strength of AGN activity among galaxies of different stellar mass, starburstiness (i.e. offset from the star-forming main sequence) and redshift; (ii) to build an empirically-motivated model that tracks SMBH and galaxy growth over time; (iii) to re-calibrate the radio-SFR relation from deepest radio data as a tool to take a census of radio AGN activity.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

Understanding what drives the interplay between active supermassive black holes (SMBHs) and galaxies is one of the most debated issues in modern Astrophysics. The feeding, feedback and cosmic growth of active galactic nuclei (AGN) must have been much more effective in the early Universe than today. Nevertheless, little is known on the high-redshift (z>3) SMBHgrowth, as this early epoch may coincide with intense star formation and obscured SMBH accretion, both unaccessible with current X-ray data. Moreover, no constraints on the role of mechanical AGN feedback in shaping galaxy growth exist at z>1. These issues point to a lack of understanding of the big picture of AGN-galaxy evolution. The proposed project hosted at CEA will clarify the link between SMBH growth, star formation, and AGN feedback since z~5. For this, I will exploit a stellar mass complete sample of 150,000 galaxies with exquisite multi-wavelength data obtained in the COSMOS field. The novel combination of the most sensitive IR-radio data, and state-of-the-art tools for spectral modeling, will allow me to derive dust-unbiased AGN and galaxy properties with unprecedented accuracy. I will push this analysis for the first time to z>3 galaxies and to highly obscured systems at any redshift. The main objectives of this comprehensive work are twofold: (1) to trace the hidden growth of SMBHs since z~5 in star-forming and quiescent galaxies; (2) to constrain the role of the host galaxy in triggering mechanical AGN feedback over cosmic time. These are crucial steps in determining how AGN feedback has shaped today's galaxies and SMBHs. One of the specific strengths of this proposal is that all the core data are already available, ensuring the achievement of the proposed goals.This innovative project will complement the existing expertise of CEA in physics of star formation, distant galaxies and numerical simulations, providing a unique opportunity for knowledge growth.

Оригинален текст от CORDIS (на английски).

Участници

COMMISSARIAT A L ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES · ParisКоординаторФранция