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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
An Exploration of AGN and Stellar Feedback Effects in the Intergalactic Medium via the Low-redshift Lyα Forest
Astronomical Journal, Volume 166, No. 6, Article 228, Year 2023
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Description
We explore the role of galactic feedback on the low-redshift Lyα (Lyα) forest (z ≲ 2) statistics and its potential to alter the thermal state of the intergalactic medium. Using the Cosmology and Astrophysics with Machine Learning Simulations (CAMELS) suite, we explore variations of the AGN and stellar feedback models in the IllustrisTNG and Simba subgrid models. We find that both AGN and stellar feedback in Simba play a role in setting the Lyα forest column density distribution function (CDD) and the Doppler width (b-value) distribution. The Simba AGN jet feedback mode is able to efficiently transport energy out to the diffuse IGM, causing changes in the shape and normalization of the CDD and a broadening of the b-value distribution. We find that stellar feedback plays a prominent role in regulating supermassive black hole growth and feedback, highlighting the importance of constraining stellar and AGN feedback simultaneously. In IllustrisTNG, the AGN feedback variations explored in CAMELS do not affect the Lyα forest, but varying the stellar feedback model does produce subtle changes. Our results imply that the low-z Lyα forest can be sensitive to changes in the ultraviolet background, stellar and black hole feedback, and that AGN jet feedback in particular can have a strong effect on the thermal state of the IGM. © 2023. The Author(s). Published by the American Astronomical Society.
Authors & Co-Authors
Tillman, Megan Taylor
United States, New Brunswick
Rutgers University–new Brunswick
Burkhart, Blakesley
United States, New Brunswick
Rutgers University–new Brunswick
United States, New York
Simons Foundation
Tonnesen, Stephanie K.
United States, New York
Simons Foundation
Bird, Simeon
United States, Riverside
University of California, Riverside
Bryan, Greg L.
United States, New York
Simons Foundation
United States, New York
Columbia University
Anglés-Alcázar, Daniel
United States, New York
Simons Foundation
United States, Storrs
University of Connecticut
Hassan, Sultan
United States, New York
Simons Foundation
United States, New York
New York University
South Africa, Bellville
University of the Western Cape
Somerville, Rachel S.
United States, New York
Simons Foundation
Dav́e, Romeel
United Kingdom, Edinburgh
The University of Edinburgh
South Africa, Bellville
University of the Western Cape
Marinacci, Federico
Italy, Bologna
Alma Mater Studiorum Università Di Bologna
Hernquist, Lars E.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Vogelsberger, Mark
United States, Cambridge
Massachusetts Institute of Technology
Statistics
Authors: 12
Affiliations: 11
Identifiers
Doi:
10.3847/1538-3881/ad02f5
ISSN:
00046256