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From: kikuchi@astro.isas.jaxa.jp
Subject: Question about evselect and arfgen
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Date: Tue, 17 Jul 2018 11:38:59 GMT
From: kikuchi@astro.isas.jaxa.jp
To: xmmhelp@sciops.esa.int
CC: kikuchi@astro.isas.jaxa.jp
Subject: Question about evselect and arfgen
Full_Name: Takahiro Kikuchi
Submission from: (NULL) (193.147.152.102)


Hello, help desk.

A. Question about event select, evselect.
A-1.
In case of setting circle where given center and radii, how does evselect
extract events from event file ? I guess whether distances from given center to
events are lower than given radii or not. If it is lower, evselect extract the
event.   

B. Question about arfgen.

B-1.
If user set parameters of sourcex, sourcey, xoffset, yoffset, xbinsize and
ybinsizet to make a box and cell(mesh), how does arfgen make a cell of initial
box? (Note cell size=2offset/binsize.)
Although the sourcex and sourcey is a center coordinates of the box, it is also
center of a cell ? or edge ?

B-2.
About pixel list. Arfgen can output pixel list. When given same detector space,
same cell size and two times large offset we got same number of rows of pixel
list. However, spatial distribution is slightly different. We want to know how
to make a pixel list.

I guess arfgen employ some kind of probability distribution... 

Please reply as soon as possible. Best regards.
 
Takahiro 


Reply 1

Resend
From: Jacobo Ebrero <xmmhelp@sciops.esa.int>
To: kikuchi@astro.isas.jaxa.jp
Subject: Re: Question about evselect and arfgen (PR#83694)
Date: Wed Jul 18 09:45:22 2018
Dear Takahiro,

Please see below the answers to your questions:

> A. Question about event select, evselect.
> A-1.
> In case of setting circle where given center and radii, how does evselect
> extract events from event file ? I guess whether distances from given
center
to
> events are lower than given radii or not. If it is lower, evselect extract
the
> event.   
> 

Yes, that is right. It will extract events whose distance from the circle centre
is not greater than the radius.

> B. Question about arfgen.
> 
> B-1.
> If user set parameters of sourcex, sourcey, xoffset, yoffset, xbinsize and
> ybinsizet to make a box and cell(mesh), how does arfgen make a cell of
initial
> box? (Note cell size=2offset/binsize.)
> Although the sourcex and sourcey is a center coordinates of the box, it is
also
> center of a cell ? or edge ?
> 

The detector map covers the region (sourcex - detxoffset ->
sourcex+detxoffset),
 (sourcey - detyoffset -> sourcey+detyoffset). This map has detxbins x
detybins
pixels. There are no parameters called xbinsize, ybinsize. If the number of bins
is odd then sourcex, sourcey will lie at the position of the central pixel. If
even then it will lie on the intersection of the four central pixels.

> B-2.
> About pixel list. Arfgen can output pixel list. When given same detector
space,
> same cell size and two times large offset we got same number of rows of
pixel
> list. However, spatial distribution is slightly different. We want to know
how
> to make a pixel list.
> 
> I guess arfgen employ some kind of probability distribution... 
> 

The pixel list gives each pixel in the detector map. If detmaptype=flat then all
the pixels have the same value. If detmaptype=psf then their values are weighted
by the point spread function. In your example then there should be the same
number of pixels but each one will have 4x the size.

You may find further information on arfgen in the SAS User Guide here:

https://xmm-tools.cosmos.esa.int/external/sas/current/doc/arfgen/index.html

Best regards,
Jacobo

----------------------
Dr. Jacobo Ebrero
XMM-Newton SOC
User Support Group


Followup 1

Compose reply
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Subject: Re: Question about evselect and arfgen (PR#83694)
From: Takahiro Kikuchi <kikuchi@astro.isas.jaxa.jp>
Date: Wed, 18 Jul 2018 21:13:14 +0900
To: Jacobo Ebrero <xmmhelp@sciops.esa.int>
Dear Help desk,

Thanks for your answer. I have a simple additional question below.

>> A. Question about event select, evselect.
>> A-1.
>> In case of setting circle where given center and radii, how does
evselect
>> extract events from event file ? I guess whether distances from given
center to
>> events are lower than given radii or not. If it is lower, evselect
extract the event.   
>> 
> Yes, that is right. It will extract events whose distance from the circle
centre
> is not greater than the radius.

An attributes of (X, Y) coordinates for event file is center of pixel or edge of
pixel ?

Takahiro


> 2018/07/18 18:45...Jacobo Ebrero <xmmhelp@sciops.esa.int>
...............
> 
> Dear Takahiro,
> 
> Please see below the answers to your questions:
> 
>> A. Question about event select, evselect.
>> A-1.
>> In case of setting circle where given center and radii, how does
evselect
>> extract events from event file ? I guess whether distances from given
center
> to
>> events are lower than given radii or not. If it is lower, evselect
extract
> the
>> event.   
>> 
> 
> Yes, that is right. It will extract events whose distance from the circle
centre
> is not greater than the radius.
> 
>> B. Question about arfgen.
>> 
>> B-1.
>> If user set parameters of sourcex, sourcey, xoffset, yoffset, xbinsize
and
>> ybinsizet to make a box and cell(mesh), how does arfgen make a cell of
> initial
>> box? (Note cell size=2offset/binsize.)
>> Although the sourcex and sourcey is a center coordinates of the box, it
is
> also
>> center of a cell ? or edge ?
>> 
> 
> The detector map covers the region (sourcex - detxoffset ->
> sourcex+detxoffset),
> (sourcey - detyoffset -> sourcey+detyoffset). This map has detxbins x
detybins
> pixels. There are no parameters called xbinsize, ybinsize. If the number of
bins
> is odd then sourcex, sourcey will lie at the position of the central pixel.
If
> even then it will lie on the intersection of the four central pixels.
> 
>> B-2.
>> About pixel list. Arfgen can output pixel list. When given same
detector
> space,
>> same cell size and two times large offset we got same number of rows of
pixel
>> list. However, spatial distribution is slightly different. We want to
know
> how
>> to make a pixel list.
>> 
>> I guess arfgen employ some kind of probability distribution... 
>> 
> 
> The pixel list gives each pixel in the detector map. If detmaptype=flat
then all
> the pixels have the same value. If detmaptype=psf then their values are
weighted
> by the point spread function. In your example then there should be the same
> number of pixels but each one will have 4x the size.
> 
> You may find further information on arfgen in the SAS User Guide here:
> 
> https://xmm-tools.cosmos.esa.int/external/sas/current/doc/arfgen/index.html
> 
> Best regards,
> Jacobo
> 
> ----------------------
> Dr. Jacobo Ebrero
> XMM-Newton SOC
> User Support Group
> 
> This message is intended only for the recipient(s) named above. It may
contain proprietary information and/or
> protected content. Any unauthorised disclosure, use, retention or
dissemination is prohibited. If you have received
> this e-mail in error, please notify the sender immediately. ESA applies
appropriate organisational measures to protect
> personal data, in case of data privacy queries, please contact the ESA Data
Protection Officer (dpo@esa.int).
> 
> 




Reply 2

Resend
From: Jacobo Ebrero <xmmhelp@sciops.esa.int>
To: kikuchi@astro.isas.jaxa.jp
Subject: Re: Question about evselect and arfgen (PR#83694)
Date: Wed Jul 18 12:18:38 2018
Dear Takahiro,

At the center of the pixel.

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


Followup 2

Compose reply
Download message
Subject: Re: Question about evselect and arfgen (PR#83694)
From: Takahiro Kikuchi <kikuchi@astro.isas.jaxa.jp>
Date: Wed, 18 Jul 2018 21:23:12 +0900
To: Jacobo Ebrero <xmmhelp@sciops.esa.int>
Dear help desk

Thanks a lot !

Takahiro

> 2018/07/18 21:18...Jacobo Ebrero <xmmhelp@sciops.esa.int>
...............
> 
> Dear Takahiro,
> 
> At the center of the pixel.
> 
> Regards,
> Jacobo
> ----------------------
> Dr. Jacobo Ebrero
> XMM-Newton SOC
> User Support Group
> 
> This message is intended only for the recipient(s) named above. It may
contain proprietary information and/or
> protected content. Any unauthorised disclosure, use, retention or
dissemination is prohibited. If you have received
> this e-mail in error, please notify the sender immediately. ESA applies
appropriate organisational measures to protect
> personal data, in case of data privacy queries, please contact the ESA Data
Protection Officer (dpo@esa.int).
> 
> 



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