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From: kikuchi@astro.isas.jaxa.jp
Subject: Making a region FITS file from FITS image
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Date: Wed, 9 May 2018 12:09:33 GMT
From: kikuchi@astro.isas.jaxa.jp
To: xmmhelp@sciops.esa.int
CC: kikuchi@astro.isas.jaxa.jp
Subject: Making a region FITS file from FITS image
Full_Name: Takahiro Kikuchi
Submission from: (NULL) (133.56.195.32)


Hello, help desk.

Could you tell me answer for following question. I want to make a FITS  region
from FITS image, pixel by pixel. Actually, the FITS image is 1 or 0 map in
(IM_X, IM_Y) image pixel.
#Now, I use 900x900 and 2.5 arcsec/pixel

When more than ten thousand pixels are converted to (X, Y) in 0.05 arcsec pixel
FITS region, I'm going to do following conversion, (IM_X, IM_Y) -> (X, Y)
with
using header keywords. And making a FITS region listing more than ten thousand
pixels to apply my event file.

1. How do I convert (IM_X, IM_Y) in degrees to (X, Y) in 0.05 arcsec pixel?
Please tell me equation with using FITS header keywords. Note that I already
know equation for converting (IM_X, IM_Y) -> (RA, DEC) in degree.

2.  How do I create FITS region file which have list row for more than ten
thousand pixel BOX? 
If you have any different idea, please tell me.

Actually, I created a new FITS region file by using tool of "region" with given
source list, however, NAXIS2 doesn't have more than 1028. So I can not overwrite
all pixels in the FITS region. 


Reply 1

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From: Jacobo Ebrero <xmmhelp@sciops.esa.int>
To: kikuchi@astro.isas.jaxa.jp
Subject: Re: Making a region FITS file from FITS image (PR#83312)
Date: Thu May 10 08:21:58 2018
Dear Takahiro,

If it helps, we describe how to select regions in a FITS image in our SAS
Threads:

https://www.cosmos.esa.int/web/xmm-newton/sas-threads

For example in the following thread in steps #5 and #6:

https://www.cosmos.esa.int/web/xmm-newton/sas-thread-timing

If your questions are about a more general use of ds9 we cannot, unfortunately,
provide support for that, as it is a tool not maintained by us. In that case
please check the ds9 reference manual and user guide that you may find here:

http://ds9.si.edu/site/Documentation.html

Best regards,
Jacobo
----------------------
Dr. Jacobo Ebrero
XMM-Newton SOC
User Support Group

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