233rd American Astronomical Society

Supermassive black holes in massive galaxies are known to show coeval growth with their hosts, but its unsure what level of coupling they have with low-mass galaxies. Using a state-of-the-art high resolution cosmological simulation, I explore how massive black holes at the centers of dwarf galaxies might grow and couple to the galaxy around them.

Transcript

1. Hungry Heart: Black Holes in Simulated Dwarf Galaxies Ray Sharma (adv. Alyson Brooks)
2. Observed Massive Black Holes 2
3. Observed Massive Black Holes Ubiquitous in massive galaxies 3
4. Observed Massive Black Holes Ubiquitous in massive galaxies Coeval growth in massive galaxies 4
5. Observed Massive Black Holes Ubiquitous in massive galaxies Coeval growth in massive galaxies Feedback in massive galaxies 5
6. Observed Massive Black Holes Ubiquitous in massive galaxies Coeval growth in massive galaxies Feedback in massive galaxies What about smaller galaxies? 6
7. Dwarf galaxies are hard to see 7
8. Dwarf galaxies are hard to see Black holes are hard to see 8
9. Dwarf galaxies are hard to see Black holes are hard to see Black holes in dwarf galaxies are really hard to see 9
10. 10 Reines et al (2013)
11. Do black holes matter to dwarf galaxies? 11
12. The Romulus Simulations Romulus25 25 Mpc Volume Tremmel+ 2017 (gas temp) RomulusC 1014 M sun Galaxy Cluster Tremmel+ 2019 (stars, uvj colors) SMBHs Certified organic, free-range, locally grown supermassive black holes Resolution: 250 pc (grav) 50 pc (hydro) ~1e5 M sun stars Gas Temp 5 kpc 100 kpc ✓ Early Seeding in low mass halos ✓ Self-consistent and physically motivated dynamics, growth, and feedback ✓ Naturally produces large-scale outflows ✓ No unnecessary additives or assumptions
13. Romulus Massive Black Holes Prescriptions for: Dynamical friction Accretion w/ angular momentum support Direct-collapse seeding Thermal feedback 13
14. 14 Fraction of Galaxies w/ BHs Stellar mass
15. 15 Fraction of Galaxies w/ BHs Stellar mass ~ Small Magellanic Cloud
16. Sharma et al, in prep 16 BH Mass Stellar Mass
17. 17 Sharma et al, in prep Central Stellar Density Central Stellar Density Stellar Mass Time
18. In Summary Simulations have pushed below observational limits Dwarf galaxies can have black holes Black holes matter to dwarf galaxies Sharma et al coming soon! 18 rss230@physics.rutgers.edu
19. Sharma et al, in prep 19 BH Mass Stellar Mass