epic-pn background in deep fields – taking a deep breath before diving finoguenov alexis
Post on 20-Dec-2015
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EPIC-pn background in deep fields – taking a deep breath
before diving
Finoguenov Alexis
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HDFS
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LH
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COSMOSCOSMOS
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COSMOS 9.5-12 keV
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0.5-2 keV
COSMOS Andy Read
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2-4.5 keV
COSMOS Andy Read
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OOTE
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Singles vs doubles
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Spectral Spectral comparicompari
sonson
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After Renormalization
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Clean Andy
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Detector Outskirts: the golden Mile
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.. and renormalized
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The effect of OOTE
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Is there some sky background Is there some sky background in there?in there?
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A msg from Andy Fabian
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Strategy for background Strategy for background subtractionsubtraction
• Observation is filtered for flaresObservation is filtered for flares• We use the Filter wheel closed accumulation of We use the Filter wheel closed accumulation of
Michael Freyberg for pnMichael Freyberg for pn• The above is similar to De Luca & MolendiThe above is similar to De Luca & Molendi• We remove the sources identified by both We remove the sources identified by both
Chandra and XMM (5-10% residual Chandra and XMM (5-10% residual contamination)contamination)
• Two regions are used to test the in-field Two regions are used to test the in-field backgroundbackground
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Components of the residual Components of the residual spectrumspectrum
• Hard X-ray background: 0.9-1.0 slopeHard X-ray background: 0.9-1.0 slope
• Galactic emission of 0.1 and 0.2 keVGalactic emission of 0.1 and 0.2 keV
• Intrumental background: quiescent soft Intrumental background: quiescent soft protonsprotons
background slope 3background slope 3
Flux is similar to total CXBFlux is similar to total CXB
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ConclusionsConclusions
• Background in deep fields appears to be similarBackground in deep fields appears to be similar• Initial problems with use of Andy Read‘s or Initial problems with use of Andy Read‘s or
David Lumb‘s background seems to resolve in David Lumb‘s background seems to resolve in difference in the cleaningdifference in the cleaning
• A consistent answer to 2-10 keV Cosmoc A consistent answer to 2-10 keV Cosmoc background with De Luca&Molendibackground with De Luca&Molendi
• Quiescent soft proton flux is not evolving Quiescent soft proton flux is not evolving during 2002-2004during 2002-2004