PG 1211+143

XMM EPIC/PN observations of PG 1211+143, for exposures longer than 5ks, in reverse chronological order of observation start time are shown below. Clicking each image will show the full size image. Scroll down for details of each observation.

Time (UT)	Duration (s)	ObsID	Image	Light curve	Spectrum
2007-12-23 17:23:46	51,069	0502050201
2007-12-21 13:41:32	64,869	0502050101
2004-06-21 05:31:14	60,033	0208020101
2001-06-15 08:04:19	55,738	0112610101

Analysis of the EPIC/PN data

ObsID: 0502050201

(click to show)

As the background light curve below shows, background flares occur 35.8 ks after start of exposure (in XMM time units this corresponds to 314855466), so we only keep the initial 35.8 ks for further analysis.

The chosen source and background regions are shown below

A sequence of spectra were generated by excising a central circular region of varying radius. The 'epatplot's of these regions, show in the animation below, show that pileup is not significant for this observation. Thus we use the entire circular source region shown in the figure above for further analysis.

Here's the source and background light curve for this observation

and the spectrum

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ObsID: 0502050101

(click to show)

Background flares occur 46.2 ks after start of exposure (in XMM time units this corresponds to 314679731), so we only keep the initial 46.2 ks for further analysis. Moderate pileup is mitigated by excising the central 15 arcseconds. A portion of the EPIC field is shown below, which also shows the selected regions for the source (annular) and the background.

Here is the source light curve (the background is <0.06 cps)

and the spectrum

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ObsID: 0208020101

(click to show)

As seen from the image below, there are background flares between the following times (in ks):
8-13.5, 23.1-27.7, >40.2. These intervals were excluded

Next we extracted annular source regions with varying inner radius (i.e. the exclusion region). As the epatplot results (below) show, there is no appreciable pileup, and we decided not to use an annulus, but just a simple circular source region of radius 35".

The source and background light curves are shown below

and the spectrum

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ObsID: 0112610101

(click to show)

A portion of the EPIC field is shown below, which also shows the selected regions for the source (annular) and the background.

Epatplots with varying inner "excised" radius, which shows that pileup is not an issue here.

Here is the source light curve (the background is <0.1 cps)

and the spectrum

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