GWDAW9 - 2004/12/16 - G040548-00-Z1 Report on the First Search for BBH Inspiral Signals on the S2 LIGO Data Eirini Messaritaki University of Wisconsin-Milwaukee.

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Presentation transcript:

GWDAW /12/16 - G Z1 Report on the First Search for BBH Inspiral Signals on the S2 LIGO Data Eirini Messaritaki University of Wisconsin-Milwaukee for the LIGO Scientific Collaboration

GWDAW /12/16 - G Z2 Outline Target Signals and Waveforms Template Family Analysis Pipeline Playground Injection Results Preliminary Background Result Summary

GWDAW /12/16 - G Z3 Target Signals and Waveforms Detection search for binary black hole coalescences » Non-spinning black holes » Component mass: 3 – 20 M SUN » Inspiral phase Low frequency cutoff for s2: 100 Hz Innermost stable circular orbit for the inspiral phase of BH binaries » 800 Hz for a 3 – 3 M SUN binary » 110 Hz for a 20 – 20 M SUN binary Very few cycles in band » Lots of waveforms available: Effective-One-Body, PadeT1, TaylorTx, but … » They disagree with each other in our frequency band

GWDAW /12/16 - G Z4 Template Family Use phenomenological templates BCV templates » Buonanno, Chen, Vallisneri, PRD 67, 2003 » h(f) = f -7/6 (1 – α f 2/3 ) θ( f cut – f) exp{ i ( φ π f t 0 + ψ 0 f -5/3 + ψ 3 f -2/3 ) } » Good match (0.90 – 0.99) with physical waveforms » Good for identifying the signal in the data » Not recommended for parameter estimation (masses, distance etc.)

GWDAW /12/16 - G Z5 Analysis Pipeline Identify coincident data between LLO and LHO » double coincident: L1/H1 (99 hours) and L1/H2 (32 hours) » triple coincident : L1/H1/H2 (242 hours) Analyze L1 data » create template bank (ψ 0, ψ 3, f cut ) » matched filter: we threshold on SNR; no χ 2 – veto Analyze 2 nd (and if necessary 3 rd ) interferometer data » create triggered bank from L1 triggers » matched filter: we threshold on SNR; no χ 2 – veto Apply coincidence criteria » time coincidence between interferometers » template parameter coincidence (ψ 0 and ψ 3 ) The pipeline parameters were tuned on the playground

GWDAW /12/16 - G Z6 Playground Injections Software injections » validate and tune our pipeline » quantify the sensitivity of the instruments » test how well the BCV templates do at recovering different waveforms Inject 2pN waveforms » Effective-One-Body (EOB) » PadeT1 » TaylorT3 “Population” » Uniform in each component mass: 3 – 20 M SUN » Uniform in log 10 (distance): 1 kpc – 20 Mpc

GWDAW /12/16 - G Z7 Playground Injections: Efficiency versus Distance

GWDAW /12/16 - G Z8 Playground Injections: End Time

GWDAW /12/16 - G Z9 Playground Injections: Chirp Mass

GWDAW /12/16 - G Z10 Playground Injections: Effective Distance

GWDAW /12/16 - G Z11 Preliminary Preliminary Background Result Background estimation » time slides PreliminaryPreliminary result » based on 15 time slides » more are in progress Need to finalize our coherent statistic

GWDAW /12/16 - G Z12 Preliminary Preliminary Background vs Injections Very clear distinction between the distribution of background triggers and that of found injections

GWDAW /12/16 - G Z13 Summary We use the BCV templates to search for BBH coalescences We have done playground injections to tune our pipeline Time slides are in progress for background estimate