سمینارهای هفتگی

Black Holes as Catalysts

دیدگاه‌تان را بنویسید:

Ali Rostami

Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan

Black Holes as Catalysts: The Far-Reaching Effects of Black Hole Retention in Evolution of Star Clusters 

Abstract: Massive stars, upon exhausting their thermonuclear fuel, undergo gravitational collapse followed by supernova explosions, leaving behind black holes (BHs) as remnants. These explosions aren’t perfectly symmetrical, and the uneven ejection of mass imparts a “natal kick” to the newborn BH. The magnitude of these kicks remains a subject of debate, creating uncertainty about the initial population of BHs retained in star clusters. High natal kicks lead to the immediate ejection of BHs from their host clusters, while gentler kicks allow them to stay put, forming a sub-system of BHs right in the cluster’s heart. This BH sub-system (BHSub) acts like a bustling, dynamic factory at the cluster’s core, pumping energy into its surroundings and dramatically influencing its evolutionary path.

In this talk, I’ll first address the dynamical processes governing clusters harboring a BHSub, followed by an examination of the emergence and evolution of the dark cluster phase. But that’s not all – I’ll demonstrate how assuming low natal kicks for BHs and the subsequent formation of a BHSub in the cluster’s heart can provide explanations for several outstanding open questions regarding globular clusters:

  1. The origin of high dark remnant fractions in Milky Way globular clusters
  2. The dichotomy between metal-rich and metal-poor globular clusters in the Milky Way
  3. The mysterious lack of metal-poor globular clusters in the inner regions of early-type galaxies

By the end, you’ll see just how far-reaching the effects of BH retention can be in the grand story of star cluster evolution.

یکشنبه  20 آبان 1403، ساعت 17:00

Sunday 10 November 2024 – 17:00 Tehran Time

Hybrid Seminar

دانشکده فیزیک – طبقه اول – کلاس فیزیک 3 Physics Department – first floor – Room Physics 3  / 

https://vc.sharif.edu/ch/cosmology

گزینه ورود به صورت مهمان – Enter as a Guest

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