Investigating Warped Disks in NGC 3344: Accretion, Recycling, and Stimulation Mechanisms
This study explores the phenomenon of warped disks in galaxies, specifically focusing on NGC 3344. We analyze mechanisms of accretion, recycling, and stimulation that contribute to the observed warps. Using data from literature, including Sancisi (1976) and Kamphuis & Briggs (1992), we investigate orbital timescales, differential precession, and angular momentum in the context of galaxy formation. Significant attention is given to the roles of cold mode accretion and gas recirculation. This research enhances our understanding of galaxy dynamics and evolution.
Investigating Warped Disks in NGC 3344: Accretion, Recycling, and Stimulation Mechanisms
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Presentation Transcript
Why Warps ?… Accretion, Recycling, Stimulation ? NGC 3344 Sancisi 1976
Why Warps ?… Accretion, Recycling, Stimulation ? NGC 3344 Sancisi 1976
Sky plane Warped disks… NGC 3344
Isolated, face-on, L*, Sc NGC 628 = M74 Kamphuis & Briggs 1992
NGC 628 = M74 Kamphuis & Briggs 1992 Ring Analysis • Lopsided • Lumpy
Edge-on View NGC 628 = M74 Kamphuis & Briggs 1992 Model Velocity Field
NGC 628 = M74 Kamphuis & Briggs 1992 Perpendicular to inner disk plane Perspective View ! Line of Nodes regresses in flattened potential
Which ones ? • Large • Relatively isolated Kim, de Blok, Briggs
Times Scales: • Orbital Times -> 1Gyr • carries imprint/memory of formation/accretion • Differential Precession • (Differential Rotation) Angular momentum: • “Corotation” ! Line of Nodes regresses in flattened potential
Mechanisms: • “Primordial Rain”(Binney ~2000) • from Random Directions… • “Cold Mode Accretion”(Kereš et al. 2005, 2009) • streams… • Recirculation/re-accretion • galaxy-galaxy interactions
Cold Mode of Gas Accretion Kereš et al. 2005, 2009 Simulation m_p ~106 M⊙, resolution ~500pc (at z=2) “Cold” gas only
Kereš et al. 2009 from Simulations Accretion rate vs Redshift Cold
NGC 1512 NGC 1510
NGC 1512 Relatively small perturbers spray gas into orbits that remember angular momentum of interaction… (doesn’t look like smooth warp)
Mechanisms: M83 (Miller et al 2009) • “Cold Mode Accretion” • Recirculation/re-accretion • … need to measure metalicity of gas… • absorption lines against background AGN • HII regions in faint star forming lumps
