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From: Andrea Martocchia <martok@quasar.u-strasbg.fr>
Subject: Re: still on odd spectra from observations affected by telemetry
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Date: Thu, 25 Nov 2004 14:14:55 +0100 (CET)
From: Andrea Martocchia <martok@quasar.u-strasbg.fr>
Subject: Re: still on odd spectra from observations affected by telemetry
To: "Pedro M. Rodriguez Pascual" <xmmhelp@xmm.vilspa.esa.es>
Cc: Andrea Martocchia <martok@quasar.u-strasbg.fr>
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--8323328-201849172-1101388495=:16373
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Hi Pedro,
thank you very much for your help. Some issue are much more clear to me 
now. Just a final note:

On Thu, 25 Nov 2004, Pedro M. Rodriguez Pascual wrote:

> Hello again, 
> 
> The huge relative error bars are very likely due to the small number of
counts
> in low energy bins. 

OK - but, on the other hand, PN registered events up to lower energies, 
yielding spectra with a much better quality below 1 kev (see plot 
attached). I thought RGS were optimized for the lower band; instead, I 
get virtually no information there with RGS.

Sincerely,

Andrea Martocchia






 
> Pedro
> 
> > 
> > Thank you Pedro for the prompt answer. 
> > What actually bothers me is not the strong flux drop (spectral shape)
at 
> > the lowest energies, but rather the fact that most channels around 
> > and below 1 keV show huge error bars. I may perhaps have a look at the
2nd 
> > order spectra.
> > Thank you again,
> > Andrea Martocchia
> > 
> > 
> > On Thu, 25 Nov 2004, Pedro M. Rodriguez Pascual wrote:
> > 
> >> Dear Andrea, 
> >> 
> >> I do not think events below 1keV are bad, but simply noise since
photons
> from
> >> the source are heavily extinguised to the a fairly large absorbing
column
> >> density.
> >> 
> >> Sincerely, 
> >> 
> >> Pedro
> >> 
> >> > 
> >> > 
> >> > Dear XMM-helpdesk colleagues,
> >> > 
> >> > the observation 0144090201 was performed in difficult
telemetry 
> >> > conditions, due to the high flux of the source GRS1915+105.
PN was set in 
> >> > Burst Mode, MOS in Timing. 
> >> > Is it possible that these difficulties with telemetry are
also the reason 
> >> > for the RGS1 and RGS2 to yield virtually all bad events below
\sim 1 keV ?
> >> > I am attaching here a plot of RGS data, for illustration. 
> >> > 
> >> > Thanks in advance,
> >> > Andrea Martocchia
> >> > 
> >> 
> > 
> > 
> 

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Reply 1

Resend
From: Pedro M. Rodriguez Pascual <xmmhelp@xmm.vilspa.esa.es>
To: martok@quasar.u-strasbg.fr
Subject: Re: still on odd spectra from observations affected by telemetry (PR#16648)
Date: Thu Nov 25 14:01:36 2004
Dear Andrea, 

The "signal" you see in PN below 1keV is most likely a redistribution effect,
i.e., due to the non-negligible probability that a high energy input photon is
registered as one (or more) low energy events. Since RGS energy/wavelength scale
is determined geometrically, redistribution effects are almost negligible in the
spectrographs.

RGS is optimized for the lower energy band, but its effective area at 0.75keV is
still ~10x smaller than the effective area of PN at 0.75keV

Sincerely, 

Pedro


>   This message is in MIME format.  The first part should be readable text,
>   while the remaining parts are likely unreadable without MIME-aware
tools.
>   Send mail to mime@docserver.cac.washington.edu for more info.
> 
> --8323328-201849172-1101388495=:16373
> Content-Type: TEXT/PLAIN; charset=US-ASCII
> 
> 
> Hi Pedro,
> thank you very much for your help. Some issue are much more clear to me 
> now. Just a final note:
> 
> On Thu, 25 Nov 2004, Pedro M. Rodriguez Pascual wrote:
> 
>> Hello again, 
>> 
>> The huge relative error bars are very likely due to the small number of
counts
>> in low energy bins. 
> 
> OK - but, on the other hand, PN registered events up to lower energies, 
> yielding spectra with a much better quality below 1 kev (see plot 
> attached). I thought RGS were optimized for the lower band; instead, I 
> get virtually no information there with RGS.
> 
> Sincerely,
> 
> Andrea Martocchia
> 
> 
> 
> 
> 
> 
>  
>> Pedro
>> 
>> > 
>> > Thank you Pedro for the prompt answer. 
>> > What actually bothers me is not the strong flux drop (spectral
shape) at 
>> > the lowest energies, but rather the fact that most channels around

>> > and below 1 keV show huge error bars. I may perhaps have a look at
the 2nd

>> > order spectra.
>> > Thank you again,
>> > Andrea Martocchia
>> > 
>> > 
>> > On Thu, 25 Nov 2004, Pedro M. Rodriguez Pascual wrote:
>> > 
>> >> Dear Andrea, 
>> >> 
>> >> I do not think events below 1keV are bad, but simply noise
since photons
>> from
>> >> the source are heavily extinguised to the a fairly large
absorbing column
>> >> density.
>> >> 
>> >> Sincerely, 
>> >> 
>> >> Pedro
>> >> 
>> >> > 
>> >> > 
>> >> > Dear XMM-helpdesk colleagues,
>> >> > 
>> >> > the observation 0144090201 was performed in difficult
telemetry 
>> >> > conditions, due to the high flux of the source
GRS1915+105. PN was set
in
> 
>> >> > Burst Mode, MOS in Timing. 
>> >> > Is it possible that these difficulties with telemetry are
also the
reason
> 
>> >> > for the RGS1 and RGS2 to yield virtually all bad events
below \sim 1
keV
> ?
>> >> > I am attaching here a plot of RGS data, for illustration.

>> >> > 
>> >> > Thanks in advance,
>> >> > Andrea Martocchia
>> >> > 
>> >> 
>> > 
>> > 
>> 

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