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From: ranalli@bo.astro.it
Subject: extended source spectroscopy?
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Date: Wed, 3 Sep 2003 17:52:16 GMT
From: ranalli@bo.astro.it
To: xmmhelp@xmm.vilspa.esa.es
CC: ranalli@bo.astro.it
Subject: extended source spectroscopy?
Full_Name: Piero Ranalli
Submission from: (NULL) (137.204.65.127)


Hi OM experts!

Is it possible to observe an extended source with the OM grisms?
(I've checked in the UHB but I found nothing related to extended sources).

This is problem I'm working on:
I'm currently the phase2 of AO3 proposal submission. I'm planning an
observation of M82, a rather extended galaxy. It will be observed with a fixed
position angle, so that the source will measure circa 45" (arcsecs) in the DETX
direction and 3' (arcprimes) in the DETY direction.
Do you think it will be feasible to get an UV spectrum of this galaxy, or the
source extent will blur every spectral feature?

Thank you in advance!

Piero Ranalli
Universita' di Bologna


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From: Pedro M. Rodriguez Pascual <xmmhelp@xmm.vilspa.esa.es>
To: ranalli@bo.astro.it
Subject: Re: extended source spectroscopy? (PR#9084)
Date: Thu Sep  4 11:54:26 2003
Dear Piero, 


> 
> Is it possible to observe an extended source with the OM grisms?
> (I've checked in the UHB but I found nothing related to extended sources).

It is possible but there is no especific SAS task to extract spectra for
extended sources. Even for point-like sources, such a task is not available,
though it will be ready in next SAS release.

> 
> This is problem I'm working on:
> I'm currently the phase2 of AO3 proposal submission. I'm planning an
> observation of M82, a rather extended galaxy. It will be observed with a
fixed
> position angle, so that the source will measure circa 45" (arcsecs) in the
DETX
> direction and 3' (arcprimes) in the DETY direction.
> Do you think it will be feasible to get an UV spectrum of this galaxy, or
the
> source extent will blur every spectral feature?
> 

This is a particulary extreme case; the spatial extent of the source is
comparable to the full spectral range provided by the grisms. Therefore, the
spectrum of the diffuse emission will be very difficult to obtain.

Sincerely, 

Pedro

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