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Population-based identification of H α-excess sources in the Gaia DR2 and IPHAS catalogues
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Fratta, M., Scaringi, S., Drew, J. E., Monguió, M., Knigge, C., Maccarone, T. J., Court, J. M. C., Iłkiewicz, K. A., Pala, A F., Gandhi, P. and Gänsicke, B. T. (Boris T.) (2021) Population-based identification of H α-excess sources in the Gaia DR2 and IPHAS catalogues. Monthly Notices of the Royal Astronomical Society, 505 (1). pp. 1135-1152. doi:10.1093/mnras/stab1258 ISSN 1365-2966.
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Official URL: https://doi.org/10.1093/mnras/stab1258
Abstract
We present a catalogue of point-like H α-excess sources in the Northern Galactic Plane. Our catalogue is created using a new technique that leverages astrometric and photomeric information from Gaia to select H α-bright outliers in the INT Photometric H α Survey of the Northern Galactic Plane (IPHAS), across the colour–absolute magnitude diagram. To mitigate the selection biases due to stellar population mixing and to extinction, the investigated objects are first partitioned with respect to their positions in the Gaia colour–absolute magnitude space, and Galactic coordinates space, respectively. The selection is then performed on both partition types independently. Two significance parameters are assigned to each target, one for each partition type. These represent a quantitative degree of confidence that the given source is a reliable H α-excess candidate, with reference to the other objects in the corresponding partition. Our catalogue provides two flags for each source, both indicating the significance level of the H α-excess. By analysing their intensity in the H α narrow band, 28 496 objects out of 7474 835 are identified as H α-excess candidates with a significance higher than 3. The completeness fraction of the H α outliers selection is between 3 and 5 per cent. The suggested 5σ conservative cut yields a purity fraction of 81.9 per cent.
| Item Type: | Journal Article | |||||||||
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| Subjects: | Q Science > QB Astronomy | |||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
| SWORD Depositor: | Library Publications Router | |||||||||
| Library of Congress Subject Headings (LCSH): | Stars -- Catalogs, Astronomical photometry, HR diagrams | |||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||
| Publisher: | Oxford University Press (OUP) | |||||||||
| ISSN: | 1365-2966 | |||||||||
| Official Date: | July 2021 | |||||||||
| Dates: |
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| Volume: | 505 | |||||||||
| Number: | 1 | |||||||||
| Page Range: | pp. 1135-1152 | |||||||||
| DOI: | 10.1093/mnras/stab1258 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Access rights to Published version: | Open Access (Creative Commons) | |||||||||
| Date of first compliant deposit: | 18 May 2022 | |||||||||
| Date of first compliant Open Access: | 18 May 2022 | |||||||||
| RIOXX Funder/Project Grant: |
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| Is Part Of: | 1 | |||||||||
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