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From: Matthew Worsley <maw43@hermes.cam.ac.uk>
Subject: Query regarding XMM HEW
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3 replies: 1 2 3
2 followups: 1 2

Private message: yes  no

Notes:

Notification:


Date: Mon, 07 Jun 2004 14:10:32 +0100 (BST)
From: Matthew Worsley <maw43@hermes.cam.ac.uk>
Subject: Query regarding XMM HEW
To: xmmhelp@xmm.vilspa.esa.es
I'm confused as to the Half Energy Widths quoted in different
documentation:

The XMM Users Guide 2.1 table 2 gives the 1.5 keV pn in-orbit HEW to be
15.2" (very close to the ground measurement of 15.1 arcsec).

On the other hand, the in-flight pn calibration (EPIC-MCT-TN-012) table 3
(p20) quotes a radius of 10.37" (also for 1.5 keV) as the 50% encircled
energy fraction radius. This would surely imply a HEW of 20.74"?

I'm not sure if I've misunderstood the definitions here, or if there is a
discrepency - please could someone help!

Matt

----------------------------------------------------
Matthew Worsley

Downing College              Institute of Astronomy
Regent Street                Madingley Road
Cambridge                    Cambridge
CB2 1DQ                      CB3 0HA
Mobile +44 (0)7714 092027    Work +44 (0)1223 337511
----------------------------------------------------


Reply 1

Resend
From: Michel G. Breitfellner <xmmhelp@xmm.vilspa.esa.es>
To: maw43@hermes.cam.ac.uk
Subject: Re: Query regarding XMM HEW (PR#13056)
Date: Tue Jun  8 17:35:24 2004
Dear Matt,

Our calibration people are currently investigating your
observation. We will come back to you as soon as possible.

With best regards,
Michel G. Breitfellner
XMM-newton User Support Group


Followup 1

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Date: Tue, 08 Jun 2004 20:43:14 +0100 (BST)
From: Matthew Worsley <maw43@hermes.cam.ac.uk>
Subject: Re: Query regarding XMM HEW (PR#13056)
To: "Michel G. Breitfellner" <xmmhelp@xmm.vilspa.esa.es>
Thanks for letting me know. I realise you must be very busy but I'd
appreciate a response as soon as possible.

Many thanks

Matt

----------------------------------------------------
Matthew Worsley

Downing College              Institute of Astronomy
Regent Street                Madingley Road
Cambridge                    Cambridge
CB2 1DQ                      CB3 0HA
Mobile +44 (0)7714 092027    Work +44 (0)1223 337511
----------------------------------------------------

On Tue, 8 Jun 2004, Michel G. Breitfellner wrote:

> Dear Matt,
>
> Our calibration people are currently investigating your
> observation. We will come back to you as soon as possible.
>
> With best regards,
> Michel G. Breitfellner
> XMM-newton User Support Group
>
>



Followup 2

Compose reply
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Date: Wed, 30 Jun 2004 13:36:20 +0100 (BST)
From: Matthew Worsley <maw43@hermes.cam.ac.uk>
Subject: Re: Query regarding XMM HEW (PR#13056)
To: "Michel G. Breitfellner" <xmmhelp@xmm.vilspa.esa.es>
I was wondering if there had been any progress on my query?

Matt Worsley

----------------------------------------------------
Matthew Worsley

Downing College              Institute of Astronomy
Regent Street                Madingley Road
Cambridge                    Cambridge
CB2 1DQ                      CB3 0HA
Mobile +44 (0)7714 092027    Work +44 (0)1223 337511
----------------------------------------------------

On Tue, 8 Jun 2004, Matthew Worsley wrote:

> Thanks for letting me know. I realise you must be very busy but I'd
> appreciate a response as soon as possible.
>
> Many thanks
>
> Matt
>
> ----------------------------------------------------
> Matthew Worsley
>
> Downing College              Institute of Astronomy
> Regent Street                Madingley Road
> Cambridge                    Cambridge
> CB2 1DQ                      CB3 0HA
> Mobile +44 (0)7714 092027    Work +44 (0)1223 337511
> ----------------------------------------------------
>
> On Tue, 8 Jun 2004, Michel G. Breitfellner wrote:
>
>> Dear Matt,
>>
>> Our calibration people are currently investigating your
>> observation. We will come back to you as soon as possible.
>>
>> With best regards,
>> Michel G. Breitfellner
>> XMM-newton User Support Group
>>
>>
>



Reply 2

Resend
From: Michel G. Breitfellner <xmmhelp@xmm.vilspa.esa.es>
To: maw43@hermes.cam.ac.uk
Subject: Re: Query regarding XMM HEW (PR#13056)
Date: Wed Jun 30 17:08:21 2004
Dear Matt,

Sorry for the late answer!

We are still investigating a possible discrepancy.
I hope to give you an answer tomorrow!

With best regards,
Michel G. Breitfellner
XMM-newton User Support Group


Reply 3

Resend
From: Michel G. Breitfellner <xmmhelp@xmm.vilspa.esa.es>
To: maw43@hermes.cam.ac.uk
Subject: Re: Query regarding XMM HEW (PR#13056)
Date: Thu Jul  1 10:28:39 2004
Dear Matt,

After several discussions with our calibration people I
think you are right:

> I'm confused as to the Half Energy Widths quoted in different
> documentation:

> The XMM Users Guide 2.1 table 2 gives the 1.5 keV pn in-orbit HEW to be
> 15.2" (very close to the ground measurement of 15.1 arcsec).

This is the best reference document. The values stated here are used in
the calibration files.

> On the other hand, the in-flight pn calibration (EPIC-MCT-TN-012) table 3
> (p20) quotes a radius of 10.37" (also for 1.5 keV) as the 50% encircled
> energy fraction radius. This would surely imply a HEW of 20.74"?

This is correct! THe document EPIC-MCT-TN-012 is less reliable than
the XMM Users Guide 2.1.

> I'm not sure if I've misunderstood the definitions here, or if there is a
> discrepency - please could someone help!

There is a discrepancy, which has to be resolved. For the moment,
please use the XMM Users Guide 2.1

With best regards,
Michel G. Breitfellner
XMM-newton User Support Group

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