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  Establishing the X-ray source detection strategy for eROSITA with simulations

Liu, T., Merloni, A., Comparat, J., Nandra, K., Sanders, J., Lamer, G., et al. (2022). Establishing the X-ray source detection strategy for eROSITA with simulations. Astronomy and Astrophysics, 661: A27. doi:10.1051/0004-6361/202141178.

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 Creators:
Liu, Teng1, Author           
Merloni, Andrea1, Author           
Comparat, Johan1, Author           
Nandra, Kirpal1, Author           
Sanders, Jeremy1, Author           
Lamer, Georg, Author
Buchner, Johannes1, Author           
Dwelly, Tom1, Author           
Freyberg, Michael1, Author           
Malyali, Adam1, Author           
Georgakakis, Antonis, Author
Salvato, Mara1, Author           
Brunner, Hermann1, Author           
Brusa, Marcella1, Author           
Klein, Matthias, Author
Ghirardini, Vittorio1, Author           
Clerc, Nicolas, Author
Pacaud, Florian, Author
Bulbul, Esra1, Author           
Liu, Ang1, Author           
Schwope, Axel, AuthorRobrade, Jan, AuthorWilms, Jörn, AuthorDauser, Thomas, AuthorMiriam, E. Ramos-Ceja1, Author           Reiprich, Thomas H., AuthorBoller, Thomas1, Author           Wolf, Julien1, Author            more..
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: Context. The eROSITA X-ray telescope on board the Spectrum-Roentgen-Gamma satellite has started to detect new X-ray sources over the full sky at an unprecedented rate. Understanding the performance and selection function of the source detection is important for the subsequent scientific analysis of the eROSITA catalogs.

Aims. Through simulations, we test and optimize the eROSITA source detection procedures, and we characterize the detected catalog quantitatively.

Methods. Taking the eROSITA Final Equatorial-Depth Survey (eFEDS) as an example, we ran extensive photon-event simulations based on our best knowledge of the instrument characteristics, the background spectrum, and the population of astronomical X-ray sources. We introduce a method of analyzing source detection completeness, purity, and efficiency based on the origin of each photon. Results. According to the source detection efficiency measured in the simulation, we chose a two-pronged strategy to build eROSITA X-ray catalogs, creating a main catalog using only the most sensitive band (0.2–2.3 keV) and an independent hard-band-selected catalog using multiband detection in a range up to 5 keV. Because our mock data are highly representative of the real eFEDS data, we used the mock catalogs to measure the completeness and purity of the eFEDS catalogs as a function of multiple parameters, such as detection likelihood, flux, and luminosity. These measurements provide a basis for choosing the eFEDS catalog selection thresholds. The mock catalogs (available with this paper) can be used to construct the selection function of active galactic nuclei and galaxy clusters. A direct comparison of the output and input mock catalogs also gives rise to a correction curve that converts the raw point-source flux distribution into the intrinsic number counts distribution.

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Language(s): eng - English
 Dates: 2022-05-18
 Publication Status: Published online
 Pages: -
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 Rev. Type: Peer
 Identifiers: DOI: 10.1051/0004-6361/202141178
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: - Volume / Issue: 661 Sequence Number: A27 Start / End Page: - Identifier: ISSN: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1