1. L.S.Stark 1, M.Doro 2, H.Bartko 3, A.Biland 1, M.Gaug 2, S.Lombardi 2, M.Mariotti 2, F.Prada 4, M.Sanchez-Conde 4, F.Zandanel 2 (for the MAGIC Collaboration*) Indirect Dark Matter Searches with the MAGIC Telescope The lightest supersymmetric particle, the neutralino , provides an excellent Cold Dark Matter (DM) candidate. In regions where DM is concentrated, a continuum-spectrum gamma radiation from annihilation of neutralinos is expected. Dwarf spheroidal galaxies accompanying the Milky Way are suitable targets for DM searched, having large mass-to-light ratio and vicinity (within 100kpc). We made the exercise to evaluate the expected flux for different DM density profiles and SUSY models. Other promising targets are the Unidentified EGRET Sources, whereas sub-haloes with a cuspy profile or IMBHs with mini-spikes could be bright gamma-ray sources. The MAGIC telescope with good sensitivity at low energy threshold is well-suited for such observations. The IACT Technique and MAGIC High collection area 236m 2 surface 10 5 m 2 effective area Flux sensitivity 2.5% crab/50 hours (10 -11 ph/cm 2 /s) Energy Resolution 30% (100 GeV) 20% (1 TeV) Low Energy Threshold (at zenith) 50 GeV (trigger) 70-100 GeV (analysis) Is the IACT Technique and the MAGIC Telescope suitable for DM searches? MAGIC telescope I MAGIC telescop I+II X 2 END 2007 (1) ETH Zurich, Switzerland (2) INFN-University of Padua, Italy (3) MPI Munich, Germany (4) IAA-CSIC Granada, Spain * for a complete list of MAGIC collaborators and extensive information on the telescope: http://wwwmagic.mppmu.mpg.de/ Physics Scenario mSUGRA models with a common scalar mass m 0 2TeV. Models with a relic density smaller than the lower WMAP bound need to be rescaled. They are indicated as blue points. The gamma-ray FLUX from DM-annihilating object: From the PARTICLE PHYSICS: Unidentified EGRET-IMBH association Such objects (100-1000 according to models of generation) must have the SAME SPECTRAL INDEX and SAME CUT-OFF at DM particle mass, thus constituting a SMOKING GUN OBSERVATION. SCENARIO: In the studies of the evolution of SuperMassive Black Holes (SMBHs), a number of Intermediate Mass Black Holes (IMBHs) is found spherically distributed in the galactic halos. Those objects must not have suffered major merging and barionic accretion during their evolution. This condition allowed a “MINI-SPIKE” of DM to be created onto the IMBH**. It is natural to primarily search for these candidates among the high galactic latitude steady emitters EGRET unidentified sources. MAGIC selected a sample of such sources that can be future observation targets. A small sample of 7 sources survived the criteria. **See Bertone, Zentner, Silk “A New Signature of DM annihilation: Gamma-rays from Intermediate Mass Black Holes”, 2005 for core and cuspy DM profiles and an angular resolution of ∆  =10 -5 sr for Draco. Sensitivity: MAGIC sensitivity for 50 hours of effective observation time. Models above the curves would be detectable. The lines correspond to a core and a cuspy density profile. Dwarf Spheroidal Galaxy Draco Differential spectra from different candidate unidentified EGRET sources extrapolated from EGRET fluxes with typical IMBHs spectrum** (colored lines) reported for two values of DM mass (m=300 GeV and m=1500 GeV). As reference the upper black line is the Crab differential spectrum, while the lower line is 1/20 of the Crab flux. GLAST SYMPOSIUM. STANFORD. FEBRUARY 2007