Abstract
Cross-matching of various information sources is a powerful tool in astronomy that helps to not only enrich and augment the contents of individual ones, but also to discover new and unique objects. In astronomy, cross-matching of catalogues is a standard tool for getting broader information on the objects by combining their data from the surveys performed at different wavelengths, and it allows to solve number of tasks like studying various populations of astronomical objects or investigating the properties of interstellar medium. However, the analysis of objects present in just one catalogue and missing the counterparts in all others is also a promising method that may lead to the discovery of both transients and objects with extreme color characteristics. Here we report on our preliminary search for objects that manifest only in ultraviolet observations by comparing the data from GALEX catalogue with several other surveys in different wavelength ranges. We describe the selection of representative sky surveys for this task and give the details on the process of their cross-matching and filtering of the results. We also discuss the possible nature of several outstanding objects detected during the analysis. We have been able to detect some of faint UV-luminous-only candidates, and a single transient event corresponding to the flare on a cool sdM subdwarf. Additionally, we discuss the potential output of a larger-scale investigation we are planning based on the experience gained during this initial study.
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Notes
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We leave the thorough investigation of this point and selection of a proper threshold that optimally separates spurious and real detections to a larger-scale follow-up work what will be based on the cross-match of a whole GALEX catalogue.
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Acknowledgement
S.K. was supported by European Structural and Investment Fund and the Czech Ministry of Education, Youth and Sports (Project CoGraDS – CZ.02.1.01/0.0/0.0/15 003/0000437). The work is partially performed according to the Russian Government Program of Competitive Growth of Kazan Federal University. O. M. thanks the CAS President’s International Fellowship Initiative (PIFI). Part of this work was supported by the National Natural Science Foundation of China under grant Nos. 11988101, 11890694 and the Chinese-Russian NSFC-RFBR project number 20-52-53009. This research has made use of NASA’s Astrophysics Data System, and use of the VizieR catalogue access tool, CDS, Strasbourg, France.
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Avdeeva, A.S., Karpov, S.V., Malkov, O.Y., Zhao, G. (2022). Cross-Matching of Large Sky Surveys and Study of Astronomical Objects Apparent in Ultraviolet Band Only. In: Pozanenko, A., Stupnikov, S., Thalheim, B., Mendez, E., Kiselyova, N. (eds) Data Analytics and Management in Data Intensive Domains. DAMDID/RCDL 2021. Communications in Computer and Information Science, vol 1620. Springer, Cham. https://doi.org/10.1007/978-3-031-12285-9_4
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