Chandra Observations of the Galactic Center: High Energy Processes at Arcsecond Resolution

2. The nuclear star cluster ……………………………………………………. 7 2.1 The nuclear cluster of cool, old stars 2.2 The disk(s) of young O/WR-stars 2.3 The central S-star cluster and the distribution of B-stars 2.4 Is there an 'equilibrium' central stellar cusp ? 2.5 Stellar mass function 2.6 Chemical abundances 3. Interstellar matter …………………………………………………………. 35 3.1 Ionized gas in Sgr A West 3.2 Neutral gas 3.3 Dust and extinction toward the Galactic Center 3.4 Hot gas and high energy emission 4. Testing the black hole paradigm: is Sgr A* a massive black hole? ………. 43 4.1 Evidence for a central compact mass from gas motions 4.2 Evidence from stellar radial and proper motions 4.3 Constraints from stellar orbits 4.4 Very Long Baseline Interferometry of Sgr A* 4.5 Does Sgr A* have an event horizon? 4.6 Could Sgr A* be a binary ? 4.7 Alternatives to a black hole configuration 5. Mass distribution in the nuclear cluster …………………………………. 57 5.1 Outlier high velocity stars 5.2 Dark matter in the central parsec ? 5.3 Comparison to earlier statistical mass estimates 5.4 Does IRS 13E contain an intermediate mass black hole? 5.5 The distance to the Galactic Center 6. Paradox of youth: how did the young stars get into the central parsec? …. 6.1 Star formation history in the central parsecs 6.2 In situ star formation or in-spiral of clusters ? 6.3 Origin of B-stars in the central cusp: migration or scattering? 6.4 What powers the central parsec ? 7. Accretion and emission close to the central black hole ………………... 93 7.1 Steady emission from Sgr A* across the electromagnetic spectrum 7.2 Variable emission 7.3 Flares 7.4 Accretion onto the black hole 8. Concluding Remarks and Outlook …………………………………….. References …………………………………………………………….... _____________________________________________________________ , with β ranging from 1.5 to 2.3 in the analyses of Paumard et al. (2006), Lu et al. ( 2009) and Bartko et al. (2009Bartko et al. ( , 2010. The inner cutoff of the clockwise system is remarkably sharp. There are six O/WR-stars projected between 0.96" and 1.5" but none inside of 0.96".

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The Galactic Center massive black hole and nuclear star cluster

Genzel

2010

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Chandra Observations of the Galactic Center: High Energy Processes at Arcsecond Resolution

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The Galactic Center massive black hole and nuclear star cluster

The Galactic Center massive black hole and nuclear star cluster

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