LIGO-G070448-01-Z A directed search for gravitational waves from Cassiopeia A Karl Wette for the LIGO Scientific Collaboration Amaldi 2007, Sydney, Australia.

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Presentation transcript:

LIGO-G Z A directed search for gravitational waves from Cassiopeia A Karl Wette for the LIGO Scientific Collaboration Amaldi 2007, Sydney, Australia Credit: X-ray: NASA/CXC/SAO; Optical: NASA/STScI; Infrared: NASA/JPL-Caltech

LIGO-G Z

Directed searches ● Looking for continuous gravitational waves ● Sky position known from photon astronomy ● Frequency and spindown derivatives not known ● Can set indirect upper limit on gravitational waves using distance and age, also known from photon astronomy

LIGO-G Z Indirect upper limit ● Assume all spindown in gravitational waves ● Age determines frequency to spindown ratio

LIGO-G Z ● Is the youngest such object in our Galaxy ● Has one of highest upper limits for a known isolated compact object: ~1.2 x ± 10% ● We will beat indirect limit with initial LIGO over some frequency band ● More info: Ben Owen's poster Cas A is interesting because...

LIGO-G Z ● Search 3-dimensional parameter space: frequency, first and second spindown ● Limits on parameter space:  Frequency: computational cost  Spindowns: age,... ● Optimal filtering algorithm (F statistic)  Coherently combines H1 and L1 data  Computational cost scales as (integration time) 7  Example: ~9 days of H1, L1 data sufficient to beat indirect limit above ~110 Hz Search algorithms

LIGO-G Z Optimal parameter space tiling ● Uses parameter space metric  Improvement: use off-diagonal components ● Body-centered cubic lattice

LIGO-G Z In progress ● Search running on APAC* cluster ● Parameter space divided into frequency bands ● Each jobs computes fixed number of templates ● Clocking up 1000s of CPU hours * Australian Partnership for Advanced Computing,

LIGO-G Z How sensitive? ● Rough estimate based on H1,L1 noise curves