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LIGO-G030575-00-W Gregory Mendell and Mike Landry LIGO Hanford Observatory The StackSlide Search Summary: November 2003.

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Presentation on theme: "LIGO-G030575-00-W Gregory Mendell and Mike Landry LIGO Hanford Observatory The StackSlide Search Summary: November 2003."— Presentation transcript:

1 LIGO-G030575-00-W Gregory Mendell and Mike Landry LIGO Hanford Observatory The StackSlide Search http://www.ligo-wa.caltech.edu Summary: November 2003 LSC Meeting

2 LIGO-G030575-00-W The StackSlide Search An incoherent search method that stacks and slides power to search for periodic sources. (P. Brady & T. Creighton Phys. Rev. D61 (2000) 082001; gr-qc/9812014.) The periodic search is computationally bound. A hierarchical approach that combines coherent & incoherent methods is needed to optimize sensitivity. Sources like LXMBs with short coherence times (~ 2 weeks) require incoherent methods. Want to add StackSlide to the incoherent toolbag along with Hough transforms. Mike Landry and I proposed that we write a stackslide DSO in June 2003.

3 LIGO-G030575-00-W StackSlide ABCs Blocks A. Input Blocks of data B. Make StacksC. Slide and output Sum Bins with frequency domain data, e.g., from SFTs. PSDs or F-statistic from SFTs (from coherent methods) (incoherent step)

4 LIGO-G030575-00-W Progress to Date Implemented SLIDING since last LSC We have working code that stack & slides PSDs from SFTs on a flat parameter space!

5 LIGO-G030575-00-W StackSlide Basic Statistics For A 2 N <  2 Detection if: PDF for gaussian noise, normalized to mean of 1. One stack: (Ave M stacks) M = number of SFTs. If F-statistic P(x) = Cx 2M-1 e -Mx for mean F = 2. (N samples) For A 2 N >  2

6 LIGO-G030575-00-W Study of E10 Injected Pulsar 0.

7 LIGO-G030575-00-W Study of E10 Injected Pulsar 2.

8 LIGO-G030575-00-W Study of E10 Injected Pulsar 3.

9 LIGO-G030575-00-W Study of E10 Injected Pulsar 4.

10 LIGO-G030575-00-W Big “to do” list still exists… Next major effort is to debug on simple test data and S2/E10/S3 injections. Need to add code that handles thresholds, parameter space metric, stacks F-statistic, runs in parallel, etc…. Need to decide on windowing/overlapping/oversampling of SFTs etc… SET UP PIPELINE THAT LEAD TO DETECTION OR UPPER LIMIT! Set preliminary upper limit on S2/S3 data on same parameter space as Hough code. Goal:

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