Page 1 PACS NHSC Webinar: New SPIRE Features in HIPE 9.1 28 th Nov 2012, Pasadena Update on SPIRE Photometer Pipeline Kevin Xu NHSC/IPAC on behalf of the

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NHSC Webinar: New SPIRE Features in HIPE 9.1 28th Nov 2012, Pasadena

Update on SPIREPhotometer Pipeline

Kevin Xu

NHSC/IPAC

on behalf of the SPIRE ICC

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What’s New in HIPE 9.1

• Improved map-making, with destriper in standard processing• Electrical crosstalk correction (significant for very bright sources)• NaiveMapper has two options for estimating flux in a sky pixel:

• simple average (the only option before HIPE 9)• inverse variance weighted mean

• “Cooler Burps” correction in user pipeline scripts• New versions of two point source photometry tasks:

• Timeline Fitter• Sussextractor

• Two new “SPIRE Useful scripts”:• Photometer Bolometer Finder• Photometer Calculate Ephemeris SSO Position

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NHSC Webinar: New SPIRE Features in HIPE 9.1 28th Nov 2012, Pasadena Destriper

• Destriper (replacing the median baseline remover as pipeline default):• Minimize map stripes by adjusting the baseline subtraction (median or

polynomial) iteratively using the naïve mapper.

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Median BaselineRemover:

Destriper:

For more information, see the Destriper’s webpage:https://nhscsci.ipac.caltech.edu/sc/index.php/Spire/PhotScanMapDestriper

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NHSC Webinar: New SPIRE Features in HIPE 9.1 28th Nov 2012, Pasadena SPIRE Naïve Mapper

signal samplings

Sky pixelTwo options:(1) No weighting: Flux of a sky pixel is the simple average of all signal samplings (by all detectors)in the pixel:

f3

f1 f2

f4

f5

(2) Inverse variance (of instrument noise) weighted:Flux of a sky pixel is the inverse variance weighted

mean of all signal samplings in the pixel, the variance is calculated using the white noise of the detector with which a given sampling is taken:

,

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Simple Average:mapPsw=naiveScanMapper(scans, array="PSW", method=BinaryWeightStrategy)

Inverse variance (of instrument white noise) weighted:mapPsw=naiveScanMapper(scans, array="PSW", method=WhiteNoiseWeight)

SPIRE Naïve Mapper

HIPE Command Line:

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NHSC Webinar: New SPIRE Features in HIPE 9.1 28th Nov 2012, Pasadena “Cooler Burp”

• Every time when SPIRE is switched on after a cooler recycle, the first ~6 h sees rapid drifts of the temperature and of the bias voltage.• It causes abnormal drifts in detector timelines, which in turn cause stripes in maps observed during the “cooler burp” period.

After cooler recycle 1 (~40 h)

After cooler recycle 2 (~40 h)

“burp” ~ 6h

bias drift ~10σ

Resistor voltage

Bias voltage

An example of stripes causedby cooler burp:

• In user pipeline, there is an optional module for the correction of this effect.

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• Sussextractor• Timeline Fitter


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• Sussextractor (new algorithm): srcList = sourceExtractorSussextractor(image=map,\ detThreshold=detectionThreshold, fwhm=fwhm[array], \ beamArea=area[array])

• Timeline Fitter (old name: timelineSourceFitterTask): result = sourceExtractorTimeline(input=scanContext, array=array, \ sourcePositionEstimate=Double1d([raCentres[i], decCentres[i]]),\ rPeak=rPeak[array])

HIPE Command Line:

• To learn more about these modules, see SPIRE Data Reduction Guide, Section 5.7 “Recipe for SPIRE Photometry”

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• Sussextractor• Timeline Fitter


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• new “SPIRE Useful scripts”:

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Bolometer Finder:

A new (and better) version:https://nhscsci.ipac.caltech.edu/spire/DPsoftware/BoloFinder/Photometer_BolometerFinder_2012oct05.py

See the following web page for details:https://nhscsci.ipac.caltech.edu/sc/index.php/Spire/BoloFinder

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Other News

http://herschel.esac.esa.int/twiki/bin/view/Public/HowToUseImprovedPointingProducts

• Improvement in pointing for data taken between 2010.3.20 – 2011.6.14Because of an error in the pointing model, Herschel data taken between2010.3.20 – 2011.6.14 suffered larger than normal pointing errors (up to 8”). Now new, improved pointing products are available for these observations in:ftp://ftp.sciops.esa.int/pub/msanchez/corrected_pointing_od320_761/.

See the following twiki page on how to use them:

• New values for SPIRE beam profile solid angles (i.e. beam areas):

http://herschel.esac.esa.int/twiki/bin/view/Public/SpirePhotometerBeamProfileAnalysis

New analyses of the SPIRE beam profile data, with background tilt subtraction and background source removal, lead to revised values for beam profile solid angles, which differ from the current official values by up to 6.7%. See the following twiki page for details:

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Anticipated Major Changes in HIPE 10

• Level 1 timelines will be destriped (i.e. baseline removed).• Zero-level correction (i.e. realistic large-scale background level taken from the Planck Survey) will be available.• Level 2 products will include:

• maps in units of Jy/beam (for point sources);• maps in units of MJy/sr (for extended sources);• maps corrected for proper motion (for solar system objects only).

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Page 1 PACS NHSC Webinar: New SPIRE Features in HIPE 9.1 28 th Nov 2012, Pasadena Update on SPIRE Photometer Pipeline Kevin Xu NHSC/IPAC on behalf of the