first 1es1959+650 observations with the magic telescope and comparison with crab nebula at 40 za...
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First 1ES1959+650 observations
with the MAGIC telescopeand comparison with Crab Nebula at 40 ZA
First 1ES1959+650 observations
with the MAGIC telescopeand comparison with Crab Nebula at 40 ZA
IntroductionData analyzedAnalysis methodPreliminary results
IntroductionData analyzedAnalysis methodPreliminary results
Nadia Tonello, Max-Planck-Insitut für Physik, MünchenNadia Tonello, Max-Planck-Insitut für Physik, München
Rencontres de Moriond 2005
Nadia Tonello, MPI MunichNadia Tonello, MPI Munich 22
What is 1ES1959+650?
1998: First detection: Utah Seven Telescope Array
Weak sourceConfirmed in 2002 by WHIPPLE and HEGRA
Most interesting aspect: orphan flare in June 2002. Candidate source for south neutrino telescopes
Elliptical galaxyElliptical galaxy Active Galactic NucleusActive Galactic Nucleus z = 0.047z = 0.047 RA =19h59m59.8sRA =19h59m59.8s Dec = +65Dec = +6508'54''08'54''
Observability from La Palma:Observability from La Palma: May-October 35May-October 35-54-54 z.a. z.a.
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The MAGIC Telescope
Canary Island La Palma2200 m asl
Largest ImagingAir CherenkovTelescope for -ray astronomy
17 m mirror dish3.5 field of view576 high-QE PMTs
Design optimized for: low energy thresholdE = 30 GeV
fast repositioning tR<30 sec
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Imaging Air Cherenkov Telescopes
~ 10 kmParticleshower
~ 1o
Ch
eren
kov
ligh
t
~ 120 m
Gammaray Cherenkov light Image of
particle shower in telescope camera
reconstruct: arrival direction, energyreject hadron background
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Standard Analysis
hadron shower (background)
gamma shower
raw image cleaned image
Shower reconstructionand background rejection based on image shapeanalysis
Hillas parameters:Length, width, distance,alpha
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MAGIC raw dataSource Days Obs. Time ZA range Azimuth
1ES1959+650
September 06, 07October 07, 10,14,15,16,17
6 h 55 m4.4 M events
min = 35max = 47
min = -26max = 2
Crab Nebula
September13, 14, 15, 16,21,22,23
2 h 17 m1.7 M events
min = 35max = 46(selected)
min= 85max = 94
Off data September 8, 10, 11, 12, 13, 14, 16, 17
2 h 49 m2.3 M events
min = 35max = 46(selected)
min= 85max = 94
Cuts optimized on Crab Nebula and applied to 1ES1959 and Off dataCuts optimized on Crab Nebula and applied to 1ES1959 and Off data
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Signal above 2000 ph.
1ES 1959 + 650: Size >2000 phSignificance: 7.0 Excess events: 165
Crab Nebula: Size >2000 phSignificance: 26.4 Excess events: 529 ± 20
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Time analysis
Binning in about 2 h dataNo substantial variation of activity
Days Obs time Significance Excess Rate(phot/min)
September6,7
121 min 3.6 42.8 ± 11.8 0.35 ± 0.09
October 7,10,15
110 min 4.0 49.5 ± 12.3 0.45 ±0.11
October 16, 17
137 min 5.0 64.0 ± 12.8 0.46 ± 0.09
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X-ray light curve
Activity not particularly high
5 - 7 Sept
7 -17 Oct
RXTE mission day
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Optical light curve
Tuorla Observatory Blazar Monitoring Program
Quiescent state
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Crab-1ES1959 comparison
Same cuts applied to Crab and 1ES1959 for each size binSame cuts applied to Crab and 1ES1959 for each size bin
Size (ph) Significance Excess events
1000<S<2000 10.2 296 ± 29
2000<S<4000 18 258 ± 14
4000<S<8000 17.3 166 ± 10
8000<S<16000 4.8 71 ± 15
1000<S<2000 5.0 364 ± 73
2000<S<4000 4.9 87 ± 20
4000<S<8000 4.2 42 ± 10
8000<S<16000 1.5 29 ± 19
CR
AB
1ES
1959
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Crab-1ES1959 comparison
Excess events/(obs. time * size bin width)
43%
12%
9%
14%
Softer spectrum?
HEGRA System Results (2000-2001):94 h obs. Time.Energy threshold: 2TeVSignificance 5.4= 3.3 ±0.78% Crab flux
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1ES1959 has been observed with MAGIC for ~7 h. Crab and OFF data (~ 2h each) have been selected to match ZA range: 40 deg.
Data have been analyzed with cuts optimized on Crab.
We have a signal from 1ES1959+650 when We have a signal from 1ES1959+650 when there was no high activity in X-raysthere was no high activity in X-rays
No variation of state, observations are fragmented in time.
Comparison with Crab in size bins:
1ES1959 ~40% to ~10% of Crab, compatible with HEGRA System flux measurements at high energies.
Work in progress: Energy spectrum.
Conclusions