HESS camera is huge: 1.5m across (fast photometers)
HESS, VERITAS, MAGIC dominate
Galactic Center
high energy density (100 eV cm^-3)
dense GMCs & starburst activity
HESS CMZ good...
VERITAS CMZ 18-sigma in 46h
HESS, mol clds trace similar areas
Local excess of 10 TeV -> requires local source of CRs
Correlation between mol clds great in Sgr B, Sgr A, but poor in Sgr D
+ no TeV emission at |l|>1 degree
+ Propagation from central source? not enough propagation time
+ Maybe CRs directly accelerated?
Central Source
Could be Sgr A*, Sgr A East SNR, or other
best fit position is 6"rms around Sgr A*
+ Sgr A East ruled out with CCD-guiding based observations
No variability detected
in general, only middle part of SED variable
Pulsar Wind Nebula ruled out with Chandra?
Dark Matter search
exclude central region with diffuse CR-driven emission
search at |b|>0.5
no positive detection; see Friday talks
Testing SFR
TeV detections of M82 (Veritas), NGC 253 (HESS)
NGC 253 approximately pointlike
+ 0.5% crab
+ Linear from gamma ray to TeV
+ hard spectrum
+ 3 orders of magnitude more luminous than CMZ
+ 2x10^38 vs 10^35
M82 VERITAS
+ 0.9% crab
+ more luminous: 2x10^39 ergs