Generating exposure maps along eRASS DE:IKI boundaries

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DTurner
Posts: 2
Joined: Mon Apr 07, 2025 3:34 am

Generating exposure maps along eRASS DE:IKI boundaries

Post by DTurner »

Hi!

I wondered if there was any way to zero the non-DR1 parts of the exposure maps of skytiles along the DE-IKI divide when generating them?

XGA (https://github.com/DavidT3/XGA) uses exposure maps to judge how much of a user specified source region is covered by a particular telescope, and unfortunately with the eRASS exposure maps we generate at the moment that can lead to some false positives - is there any way to force the exposure map generation to zero out the part of the tile we don't have events for?

Cheers,
David
Dr David Turner
Staff Scientist - High Energy Astrophysics Science Archive Research Center (HEASARC)
Assistant Research Scientist - University of Maryland, Baltimore County (UMBC)
GitHub - https://github.com/DavidT3
Website - https://davidt3.github.io/
MiriamRamos
Posts: 35
Joined: Wed Jun 23, 2021 11:46 am

Re: Generating exposure maps along eRASS DE:IKI boundaries

Post by MiriamRamos »

Hi David,

Unfortunately, there is no such option on the eSASS4DR1. You could use Python to cut the exposure maps using these boundaries:

sel_de = (g_l > 179.94423568) & (g_l <= 359.94423568)

This will be corrected in future eSASS releases.

Best wishes,

Miriam Ramos-Ceja
DTurner
Posts: 2
Joined: Mon Apr 07, 2025 3:34 am

Re: Generating exposure maps along eRASS DE:IKI boundaries

Post by DTurner »

Hi Miriam,

That is a very good point, thanks very for a good stop-gap solution!

Cheers,
David
Dr David Turner
Staff Scientist - High Energy Astrophysics Science Archive Research Center (HEASARC)
Assistant Research Scientist - University of Maryland, Baltimore County (UMBC)
GitHub - https://github.com/DavidT3
Website - https://davidt3.github.io/
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