GW Data Analysis (from an experimentalist’s point of view)

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Presentation transcript:

GW Data Analysis (from an experimentalist’s point of view) Gabriela González Louisiana State University Gravitation: A Decennial Perspective CGPG, Penn State, June 8, 2003

Data Analysis: what data? 3 PDs, 6 signals, 4 DOF AS_Q, or GW signal Distances are controlled by feedback loops: we need to know what was there before we reduced the signals to keep cavities resonant: “calibration”.

Data analysis starts with good data Data analysis starts with good data... that is a lot more than a good spectrum! LLO interferometer S1 S2 (Feb-Apr ’03)

Keeping interferometer locked S1 run: 17days (408 hrs) Seismic Noise in the band

Calibrated spectrum Calibration lines

S1: Calibration stability

(Preliminary) Results from S1 Upper Limits on Burst Sources Upper limit in strain compared to prior (cryogenic bar) results: S1: h < 5 x 10-17 - this result IGEC 2000 : h < 1 x 10-17 Astone et al. 2001: h ~ 2 x 10-18 Upper limit in rate constrained by observation time: S1: 17d, 3x coinc.- this result IGEC - 90d (2X coinc.), 260d (3X coinc.) Astone et al. - 90d Excluded region, 90 % CL

(Preliminary) Results from S1 Upper Limits on Stochastic Background Sources S1 (50 hrs, H2-L1): W0h2100 < 23 Current best upper limits: Inferred: From Big Bang nucleosynthesis: Measured: Garching-Glasgow interferometers: Measured: EXPLORER-NAUTILUS:

(Preliminary) Results from S1 Upper Limits on Periodic Sources S1: upper limits on J1939+2134 (1.284 Hz) amp < 10-22 Previous limits for same system: 40m: ~10-17 Glasgow detector: 10-20 (2nd harm.) At other frequencies, bars have set up limits near 10 -24

(Preliminary) Results from S1 Upper Limits on NS Inspiral Sources Mass distribution and effective distance S1: 289 hrs, 2x: 116 hrs; R< 164/yr in Milky Way Equivalent Galaxy (Expected: ~10-5/yr) Previous searches: LIGO 40m (’94, 25 hrs) 0.5/hr, 25 kpc TAMA300 ’99 ( 6 hrs) 0.6/hr, ~ 1kpc Glasgow-Garching ’89 (100 hrs) no events, ~1kpc IGEC ’00-’01 (2yrs): no events, ~10 kpc

An eventful segment, with stable calibration Loudest inspiral event (but LHO not locked  )

A “good” template match, a “bad” detector time

Statistics of the signal: gaussian, stationary?

Statistics of the signal: gaussian, stationary?

Conclusions Data analysis effort has started succesfully Search methods are very diverse Methods set upper limits, but are ready for detection Data quality aspects are essential Collaboration between theorists (sources), data analysis experts (methods) and experimentalists (data quality) is important.