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Kagoya/Inoue Optical: Slotnick, Slotnick & Block The Black Hole Accretion Disk in NGC4258: One of...
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Transcript of Kagoya/Inoue Optical: Slotnick, Slotnick & Block The Black Hole Accretion Disk in NGC4258: One of...
![Page 1: Kagoya/Inoue Optical: Slotnick, Slotnick & Block The Black Hole Accretion Disk in NGC4258: One of Nature’s Most Beautiful Dynamical Systems Alice Argon.](https://reader036.fdocuments.us/reader036/viewer/2022070407/56649e245503460f94b12267/html5/thumbnails/1.jpg)
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Optical: Slotnick, Slotnick & Block
The Black Hole Accretion Disk in NGC4258:One of Nature’s Most Beautiful Dynamical Systems
Alice Argon
Lincoln Greenhill
Liz Humphreys
Jim Moran
Mark Reid
Jim Moran
NGC 4258 Group
Student projectsJim HerrnsteinAdam TrotterAnn BraggMaryam Modjaz
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The Archetype: NGC 4258
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Angular resolution = 200 as (0.006 pc at 7.2 Mpc)
Spectral resolution < 1 kms-1
VLBA
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VLBI Monitoring of NGC42581997–2000
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NGC 4258: 18 VLBI Epochs 1997–2000
CfA Maser Group, Argon et al., 2007
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TO OBSERVER
0.1pcObserver’s view
Top View
High
Bowl
Redshiftedmasers
Blueshiftedmasers
SystemicMasers
NGC4258
Inclination warp (flattening of high velocity rotation curve): 8° across reds
Position angle warp (declinations): 9° across reds
Disk obscuring much of central region. black hole mass 38 million M
Systemic masers originate from bowl in front side of side, depth 0.04 pc
0.1pc
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Measurement of the Thickness of the AccretionDisk in the Vicinity of the Systemic Features
CfA Maser Group: Argon et.al., ApJ, 2007. Astroph /0701396
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Search for Zeeman Splitting of Maser Features in NGC 4258 (B < 30 mG)
VLA Spectrum GBT Spectrum
Modjaz, Moran, Kondratko, & Greenhill, ApJ, 2005
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Average spectrum and velocity vs. timeof maser features
Systemic Systemic
RedshiftedRedshifted
Argon et al., 2007, Humphreys et al. (in prep)
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Red shifted Systemic Blue shiftedRed shifted Systemic Blue shifted
NGC4258: Velocities, Positions, and Accelerations
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The Effect of a Spiral Arm on the Velocitiesof Systemic Maser Features
Humphreys et al., in preparation
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y deviation from image – PA warp (mas)
Humphreys et al., in preparation
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Acceleration of the “1306” kms-1 Feature
Humphreys et al., in preparation
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Distance Measurements to NGC 4258• Masers7.2 +/- 0.3 +/-0.4 Mpc Herrnstein et al., Nature 1999
• Cepheid Variables8.1 +/- 0.4 Mpc Maoz et al., 1999, Nature (15 Cepheids)
7.8 +/- 0.3 +/- 0.5 Mpc Newman et al., 2001, Ap.J. (same 15 Cepheids)
7.5 +/- 0.3 Mpc Macri et al., Ap.J. 652,1133 (300 Cepheids)
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Conclusions1. Bowl model well established:
a. 8 deg change in inclination across disk
b. Vertical displacements of HV features predicted by accelerations and inclination warp correlate well with observed vertical positions
2. Molecular disk thickness = 5.1 microarcsecs, T = 600K
3. Trends in accelerations in systemic features:
a. Change in annular radius of 5 percent, or
b. Interaction with spiral arm, or,
c. Confocal eccentric orbits
4. Magnetic field less than 30 mG
5. Evidence for periodic structure in high velocity features