Thursday, March 28, 2024
08:00 AM - 05:00 PM
No Meeting Week
All are encouraged to cancel or reschedule their meetings between 3/25/24 and 3/29/24.
Read more about this event Thursday, March 28, 2024
03:00 PM - 04:00 PM
AGN Seminar (Hybrid)
Painting the Cosmos Red: JWST Insights into Red Super Massive Black Holes
Vasily Korkorev (University of Groningen)
Deep observations with JWST have revealed an emerging population of red point-like sources that could provide a link between the postulated supermassive black hole seeds and observed quasars. In this talk I present a JWST/NIRSpec spectrum from the JWST Cycle 1 UNCOVER Treasury survey, of a massive accreting black hole at z = 8.50, displaying a clear broad-line component as inferred from the Hβ line. Combining the derived black hole mass with the detailed modeling of the spectral energy distribution in the optical and near-infrared, together with constraints from ALMA we find an unprecedented ratio of black hole to host mass of at least ∼ 30%. This is orders of magnitude higher compared to the local QSOs, but is consistent with recent AGN studies at high redshift with JWST. In conjunction with other literature works on high-z quasars this finding suggests that a non-negligible fraction of supermassive black holes either started out from massive seeds and/or grew at a super-Eddington rate at high redshift. It is clear that these objects play an important role in the story of black hole growth at early times, however so far a systematic review of these enigmatic AGN across multiple fields has not been undertaken. To this end, I will present my most recent work which explores deep JWST photometry in blank fields, covering ~0.2 deg^2, to select and study a statistical sample of these enigmatic red compact objects.
Read more about this event Vasily Korkorev (University of Groningen)
Deep observations with JWST have revealed an emerging population of red point-like sources that could provide a link between the postulated supermassive black hole seeds and observed quasars. In this talk I present a JWST/NIRSpec spectrum from the JWST Cycle 1 UNCOVER Treasury survey, of a massive accreting black hole at z = 8.50, displaying a clear broad-line component as inferred from the Hβ line. Combining the derived black hole mass with the detailed modeling of the spectral energy distribution in the optical and near-infrared, together with constraints from ALMA we find an unprecedented ratio of black hole to host mass of at least ∼ 30%. This is orders of magnitude higher compared to the local QSOs, but is consistent with recent AGN studies at high redshift with JWST. In conjunction with other literature works on high-z quasars this finding suggests that a non-negligible fraction of supermassive black holes either started out from massive seeds and/or grew at a super-Eddington rate at high redshift. It is clear that these objects play an important role in the story of black hole growth at early times, however so far a systematic review of these enigmatic AGN across multiple fields has not been undertaken. To this end, I will present my most recent work which explores deep JWST photometry in blank fields, covering ~0.2 deg^2, to select and study a statistical sample of these enigmatic red compact objects.
Friday, March 29, 2024
08:00 AM - 05:00 PM
No Meeting Week
All are encouraged to cancel or reschedule their meetings between 3/25/24 and 3/29/24.
Read more about this event Tuesday, April 02, 2024
03:45 PM - 05:00 PM
ASD Colloquium (Hybrid)
Jordy R. Davelaar (Columbia, CCA/Flatiron)
Read more about this event Wednesday, April 03, 2024
12:00 PM - 01:00 PM
SED Director’s Seminar
Please join us for SED Director's Seminar hosted by the X-ray Astrophysics Laboratory, Code 662!
The first radio investigation of spatially-resolved mid-infrared dual active galactic nuclei
Miranda McCarthy
From the Microscopic to the Macroscopic: Atomic Data in the XRISM Era of High Resolution X-ray Spectra Analysis
Rachel Hemmer
A Closer Look at AGN- and Star Formation-Driven Outflows in a Compton-Thick Edge-on Galaxy
Isabella Carlton
Read more about this event The first radio investigation of spatially-resolved mid-infrared dual active galactic nuclei
Miranda McCarthy
From the Microscopic to the Macroscopic: Atomic Data in the XRISM Era of High Resolution X-ray Spectra Analysis
Rachel Hemmer
A Closer Look at AGN- and Star Formation-Driven Outflows in a Compton-Thick Edge-on Galaxy
Isabella Carlton
Thursday, April 04, 2024
10:00 AM - 10:45 AM
Virtual Chat with the Code 600 Director
Everyone is Welcome!
ACTUAL TIME: 1:10 - 1:55pm
Read more about this event ACTUAL TIME: 1:10 - 1:55pm