Hi Matteo
If you're making merged exposure maps, the exposure time is the equivalent exposure for the *on-axis* combined eROSITA effective area.
You can take the effective area at a particular energy from the ARF file here: https://erosita.mpe.mpg.de/dr1/eSASS4DR ... R1_arfrmf/
Cheers
Jeremy
Search found 28 matches
- Fri May 03, 2024 12:50 pm
- Forum: Data analysis
- Topic: Effective area for flux estimate
- Replies: 1
- Views: 26
- Thu Apr 25, 2024 1:55 pm
- Forum: srctool
- Topic: Radial Profiles with srctool
- Replies: 2
- Views: 48
Re: Radial Profiles with srctool
Dear Joe I would need to see a more complete description of how you are using srctool to understand the problem better. However, I can give some comments: The exposure time given by srctool isn't the same as in exposure maps - it is more of an on-time. See the docs. I would not use the rates from sp...
- Wed Apr 03, 2024 2:45 pm
- Forum: Data products files
- Topic: Are the Half-Sky maps available in fits format?
- Replies: 7
- Views: 1564
Re: Are the Half-Sky maps available in fits format?
Hi Erwin
I'm glad you've managed. However, remember that there's light leak in the soft band that's present in the pipeline-produced maps. There's also some (relatively mild) flaring in the harder band (see Merloni et al. 2.3-5.0 keV map).
Jeremy
I'm glad you've managed. However, remember that there's light leak in the soft band that's present in the pipeline-produced maps. There's also some (relatively mild) flaring in the harder band (see Merloni et al. 2.3-5.0 keV map).
Jeremy
- Thu Mar 21, 2024 8:04 am
- Forum: Data products files
- Topic: Are the Half-Sky maps available in fits format?
- Replies: 7
- Views: 1564
Re: Are the Half-Sky maps available in fits format?
We've put some half sky maps here from Zheng et al.: https://erosita.mpe.mpg.de/dr1/AllSkySu ... yMaps_dr1/
However, they are projected maps and are not in Healpix format.
However, they are projected maps and are not in Healpix format.
- Mon Mar 18, 2024 8:37 am
- Forum: expmap
- Topic: Generating expmap takes very long time
- Replies: 1
- Views: 214
Re: Generating expmap takes very long time
Hi - expmap can be slow for large maps or polar regions. If it's still printing messages, it's likely working. Probably the easiest way to speed it up is by enabling OpenMP parallelisation. You can try setting the OMP_NUM_THREADS environment variable to a value >1 to run on more than one core. Jeremy
- Mon Mar 18, 2024 8:02 am
- Forum: srctool
- Topic: questions about srctool
- Replies: 3
- Views: 228
Re: questions about srctool
There is still one question. When I extract the spectra from a large area, the photon counts given by *srctool* do not match the value I directly count from the event file. The total number of photon counts in the spectrum file is about 6,000 and when I consider the same region, I count to ~38,000 ...
- Mon Mar 11, 2024 7:58 am
- Forum: srctool
- Topic: questions about srctool
- Replies: 3
- Views: 228
Re: questions about srctool
Hi Ziqian Hua 1)I find that the photon counts given by the *srctool* are less than the value which I directly count. The question is how *srctool* calculate the GTI and where to find the GTI information? B.T.W. It seems that *srctool* cannot correctly calculate the exposure? For my region, the EXPOS...
- Tue Mar 05, 2024 3:01 pm
- Forum: Calibration
- Topic: PSF Kernels for Convolution
- Replies: 4
- Views: 237
Re: PSF Kernels for Convolution
Hi I would like to plot a PSF radial profile in the 0.2--2.3 keV range and compare it with the profile of a real source. However, I have some questions: Firstly, there are many different types of PSF files in the caldb, and I am not sure which one to choose. For a source in the survey, tm1_2dpsf_190...
- Mon Mar 04, 2024 3:42 pm
- Forum: Calibration
- Topic: PSF Kernels for Convolution
- Replies: 4
- Views: 237
Re: PSF Kernels for Convolution
Hi Joseph * Are these 2D images appropriate to be used as image convolution kernels? Yes, that is how srctool does its PSF correction, and what ermldet uses in image mode source detection. They are derived from PANTER ground-based measurements. Each HDU is a different energy. You may want to make th...
- Mon Feb 12, 2024 8:30 am
- Forum: Data products files
- Topic: access to eRASS1 sky maps using Aladin-lite or ESASKY
- Replies: 1
- Views: 154
Re: access to eRASS1 sky maps using Aladin-lite or ESASKY
Dear Hui We plan to publish these in the standard way so they are listed in Aladin, etc. Hopefully we will do this in the next few weeks. Until then, they can be loaded into the desktop Aladin tool by the URLs on https://erosita.mpe.mpg.de/dr1/AllSkySurveyData_dr1/HalfSkyMaps_dr1/ Best wishes Jeremy