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From: bbonsa1@umbc.edu
Subject: Flux too high
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Date: Fri, 8 Nov 2013 12:41:45 GMT
From: bbonsa1@umbc.edu
To: xmmhelp@sciops.esa.int
CC: bbonsa1@umbc.edu
Subject: Flux too high
Full_Name: Brittany Bonsall
Submission from: (NULL) (98.204.82.57)


Hello-

I am working with the Epic PN data. I have used XMM clean to create a cleaned
image, and then made an annular region, and extracted a spectrum of the region
and the background using xselect. When using xspec to try to fit this data, the
flux seems too high for that size region. Over the energy range 0.5 - 12.0 keV,
there seems to be data points which are generally above the fit that I was
having a hard time fitting. I was wondering if you had any suggestions for what
could be causing the flux to be so high?

Thank you,
Brittany


Reply 1

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From: Pedro M. Rodriguez Pascual <xmmhelp@sciops.esa.int>
To: bbonsa1@umbc.edu
Subject: Re: Flux too high (PR#73190)
Date: Mon Nov 11 08:47:13 2013
Hello, 

Unfortunately we cannot get a clear idea of the actual problem with the
information provided. 

Will you please send to us the spectrum, background, response matrix and
effective area files used in xspec as well as the model to fit (ideally with all
xspec commands)?

Thanks,

Pedro



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Date: Mon, 11 Nov 2013 21:32:32 -0500
Subject: Re: Flux too high (PR#73190)
From: Brittany Bonsall <bbonsa1@umbc.edu>
To: "Pedro M. Rodriguez Pascual" <xmmhelp@sciops.esa.int>
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Hello,

I have attached the necessary files. To clarify which files are which--
spectrum : reg4_clean.pha
background : back.pha
response matrix : reg3_clean.rmf
effective area : reg3_clean.arf

I am using the wabs(Raymond) model to fit the data, after ignoring the bad
pixels. The model parameters are as follows:

nH = 0.03
kT = 7
Abundance = 0.001
Redshift = 0.05
Norm = 0.001

The nH and redshift should be frozen, all other parameters are free. I have
attached an xspec log of the commands used for the fitting as well. I hope
this is helpful, please let me know if there is any more that you need.

Thank you,
Brittany


On Mon, Nov 11, 2013 at 3:47 AM, Pedro M. Rodriguez Pascual <
xmmhelp@sciops.esa.int> wrote:

> Hello,
>
> Unfortunately we cannot get a clear idea of the actual problem with the
> information provided.
>
> Will you please send to us the spectrum, background, response matrix and
> effective area files used in xspec as well as the model to fit (ideally
> with all
> xspec commands)?
>
> Thanks,
>
> Pedro
>
>
>
> This message and any attachments are intended for the use of the addressee
> or addressees only. The unauthorised disclosure, use, dissemination or
> copying (either in whole or in part) of its content is not permitted. If
> you received this message in error, please notify the sender and delete it
> from your system. Emails can be altered and their integrity cannot be
> guaranteed by the sender.
>
> Please consider the environment before printing this email.
>
>

--001a1132efd03b328204eaf1a92a
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hello,</div><div><br></div>I
have attached the necess=
ary files. To clarify which files are which--<div><div>spectrum :
reg4_clea=
n.pha</div><div>background : back.pha</div><div>response
matrix : reg3_clea=
n.rmf</div>
<div>effective area :
reg3_clean.arf</div><div><br></div><div>I am using
th=
e wabs(Raymond) model to fit the data, after ignoring the bad pixels. The m=
odel parameters are as
follows:</div><div><br></div><div>nH =3D
0.03</div>
<div>kT =3D 7</div><div>Abundance =3D
0.001</div><div>Redshift =3D 0.05</di=
v><div>Norm =3D
0.001</div><div><br></div><div>The nH and redshift
should b=
e frozen, all other parameters are free. I have attached an xspec log of th=
e commands used for the fitting as well. I hope this is helpful, please let=
 me know if there is any more that you need.</div>
</div><div><br></div><div>Thank
you,</div><div>Brittany</div></div><div cla=
ss=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On
Mon, Nov 11, 2013 =
at 3:47 AM, Pedro M. Rodriguez Pascual <span dir=3D"ltr">&lt;<a
href=3D"mai=
lto:xmmhelp@sciops.esa.int"
target=3D"_blank">xmmhelp@sciops.esa.int</a>&gt=
;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Hello,<br>
<br>
Unfortunately we cannot get a clear idea of the actual problem with
the<br>
information provided.<br>
<br>
Will you please send to us the spectrum, background, response matrix and<br=
>
effective area files used in xspec as well as the model to fit (ideally wit=
h all<br>
xspec commands)?<br>
<br>
Thanks,<br>
<br>
Pedro<br>
<div class=3D"HOEnZb"><div class=3D"h5"><br>
<br>
<br>
This message and any attachments are intended for the use of the addressee =
or addressees only. The unauthorised disclosure, use, dissemination or copy=
ing (either in whole or in part) of its content is not permitted. If you re=
ceived this message in error, please notify the sender and delete it from y=
our system. Emails can be altered and their integrity cannot be guaranteed =
by the sender.<br>

<br>
Please consider the environment before printing this email.<br>
<br>
</div></div></blockquote></div><br></div>

--001a1132efd03b328204eaf1a92a--
--001a1132efd03b328604eaf1a92c
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UyBzdGFuZGFyZCAgICAgICAgICAgICBCSVRQSVggID0gICAgICAgICAgICAgICAgICAtMzIgLyBu
dW

Message of length 5929920 truncated


Reply 2

Resend
From: Pedro M. Rodriguez Pascual <xmmhelp@sciops.esa.int>
To: bbonsa1@umbc.edu
Subject: Re: Flux too high (PR#73190)
Date: Tue Nov 12 10:08:01 2013
Hi,

thanks for the files. Unfortunately, I am afraid we cannot be of much help: 

-) from the xspec log, apparently you are fitting the model to a binned spectrum
which is not included in your last email. Anyway, if you think that the bad
quality of the fit is due to calibration issues, please send us a detailed
report with your reasons.

-) as the source and background spectra have not been created with specific SAS
tools evselect/xmmselect/especget , we cannot guarantee the reliability of these
spectra and other files (rmf, arf) based on them.

With our apologies, 

Pedro

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