Description du projet
À la découverte des secrets de la formation des trous noirs supermassifs
Certaines galaxies extrêmes de l’Univers ont pu former des trous noirs supermassifs (TNSM) dont la masse dépasse 100 millions de masses solaires au cours des premiers milliards d’années de l’histoire cosmique. Les scientifiques essaient d’appréhender la manière dont ces trous noirs supermassifs ont pu se former si rapidement, ainsi que l’histoire de l’accrétion de la population des trous noirs supermassifs dans les premiers temps de l’Univers. Pour aider à répondre à ces questions, le projet HIZRAD, financé par l’UE, a l’intention de constituer un échantillon de noyaux galactiques actifs dans les premiers instants de l’Univers sélectionnés sur la base de leurs émissions radio, qui atteint de nouvelles zones de l’espace paramétrique et est plus de 100 fois plus vaste que les échantillons actuels. Ces ensembles de données permettront d’obtenir les premières mesures fiables de l’accrétion et de l’histoire de la masse des TNSM dans l’Univers primitif.
Objectif
Every massive galaxy in the Universe has at its heart a super-massive black hole (SMBH), with some extreme galaxies able to build SMBH with masses in excess of 100 million solar masses within only the first few Gyr of cosmic history. How did these individual extreme SMBH form so quickly, and what was the accretion history of the wider SMBH population in the early Universe? As a probe of black-hole accretion that is not subject to dust obscuration, sensitive new radio continuum surveys offer a unique opportunity to study the first few Gyr of SMBH formation in unprecedented detail and answer these fundamental questions. This project will combine two surveys the participant has a leading role in, the Low Frequency Array (LOFAR) Surveys Project and the WEAVE-LOFAR spectroscopic survey, to build a sample of radio selected active galactic nuclei in the early Universe that reaches new and extremely important areas of parameter space and is >100x larger than existing samples. The unprecedented scale and sensitivity of these datasets will result in the first robust measurements of the accretion and mass history of SMBH in the early Universe. This project will also discover the first sample of luminous radio galaxies within the Epoch of Reionization; an important breakthrough that opens an entirely new window onto the process of cosmic reionization - one of the outstanding current cosmological challenges. The University of Edinburgh is a leading centre for the study of galaxy and black-hole formation in the early Universe, both through radio continuum and optical spectroscopy surveys. The researcher is an expert in the optical astronomy techniques required to perform the proposed robust population studies and is uniquely placed to exploit the exquisite WEAVE-LOFAR data. Together, these transformational datasets and the complementary expertise of the host and researcher will result in world-leading research that has extensive impact within the wider astronomical community.
Champ scientifique
Mots‑clés
Programme(s)
Régime de financement
MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)Coordinateur
EH8 9YL Edinburgh
Royaume-Uni