Population-based identification of H α-excess sources in the Gaia DR2 and IPHAS catalogues

Author:

Fratta M12,Scaringi S12ORCID,Drew J E3ORCID,Monguió M45ORCID,Knigge C6,Maccarone T J2,Court J M C2ORCID,Iłkiewicz K A12ORCID,Pala A F7,Gandhi P6ORCID,Gänsicke B8ORCID

Affiliation:

1. Centre for Extragalactic Astronomy, Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK

2. Department of Physics and Astronomy, Texas Tech University, Lubbock, TX 79409-1051, USA

3. Department of Physics and Astronomy, Faculty of Maths and Physical Sciences, University College London, Gower Street, London WC1E 6BT, UK

4. Institut d’Estudis Espacials de Catalunya, Universitat de Barcelona (ICC-UB), Martí i Franquès 1, E-08028, Spain

5. Universitat politècnica de Catalunya, Departament de Física, c/Esteve Terrades 5, E-08860 Castelldefels, Spain

6. School of Physics and Astronomy, University of Southampton, University Road, Southampton SO17 1BJ, UK

7. European Southern Observatory, Karl Schwarzschild Strasse 2, Garching bei Munchen, D-85748, Germany

8. Astronomy and Astrophysics Group, Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK

Abstract

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.

Funder

FEDER

ICCUB

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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1. The enigma of Gaia18cjb: A possible rare hybrid of FUor and EXor properties;Astronomy & Astrophysics;2024-06

2. Seventeen 2 Micron All Sky Survey (2MASS) Hypervelocity Stars (HVS) from Gaia DR3;Research Notes of the AAS;2024-01-18

3. XGAPS: a sub-arcsec cross-match of galactic plane surveys;Monthly Notices of the Royal Astronomical Society;2022-11-17

4. Spectroscopic follow-up of a subset of the Gaia/IPHAS catalogue of Hα-excess sources;Monthly Notices of the Royal Astronomical Society;2022-11-09

5. Hot white dwarf candidates from the IGAPS-GALEX cross-match;Monthly Notices of the Royal Astronomical Society;2022-05-20

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