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

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

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.

Astrophysics - Astrophysics of Galaxies, Astrophysics - Solar and Stellar Astrophysics
0035-8711
1135–1152
Fratta, M.
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Scaringi, S.
88701970-a1b9-41fe-bf55-886716ee3374
Drew, J. E.
40d903d7-edb5-479c-beef-462dced47ce7
Monguio, M.
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Knigge, C.
ac320eec-631a-426e-b2db-717c8bf7857e
Maccarone, T. J.
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Court, J. M. C.
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Ilkiewicz, K. A.
0791e0ee-eaf2-4fa6-8156-a65a5a58672c
Pala, A. F.
eb0ada06-3456-4ee0-a2c6-6144f95b33de
Gandhi, P.
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Gaensicke, B.
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Fratta, M.
5dcc23b2-0d86-44df-9cbc-059a578f235d
Scaringi, S.
88701970-a1b9-41fe-bf55-886716ee3374
Drew, J. E.
40d903d7-edb5-479c-beef-462dced47ce7
Monguio, M.
e2e4310a-4ed4-41a4-97a6-a48cb5702eda
Knigge, C.
ac320eec-631a-426e-b2db-717c8bf7857e
Maccarone, T. J.
c2f1d87b-e2ef-4e33-b09f-a2861d917ea8
Court, J. M. C.
6e39b3e2-c269-49eb-9e06-cc47981117f1
Ilkiewicz, K. A.
0791e0ee-eaf2-4fa6-8156-a65a5a58672c
Pala, A. F.
eb0ada06-3456-4ee0-a2c6-6144f95b33de
Gandhi, P.
5bc3b5af-42b0-4dd8-8f1f-f74048d4d4a9
Gaensicke, B.
9e3833c5-638c-40ef-847b-db28f316b77c

Fratta, M., Scaringi, S., Drew, J. E., Monguio, M., Knigge, C., Maccarone, T. J., Court, J. M. C., Ilkiewicz, K. A., Pala, A. F., Gandhi, P. and Gaensicke, B. (2021) Population-based identification of Hα-excess sources in the Gaia DR2 and IPHAS catalogues. Monthly Notices of the Royal Astronomical Society, 505 (1), 1135–1152. (doi:10.1093/mnras/stab1258).

Record type: Article

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.

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2105.00749v2 - Accepted Manuscript
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Accepted/In Press date: 27 April 2021
Published date: 1 July 2021
Additional Information: Funding Information: The cross-matches, as well as some of the figures used for this paper, were produced with the use of the astronomy-oriented software 'TOPCAT' (Taylor 2005). MM acknowledges the support by the Spanish Ministry of Science, Innovation and University (MICIU/FEDER, UE) through grant RTI2018-095076-B-C21, and the Institute of Cosmos Sciences University of Barcelona (ICCUB, Unidad de Excelencia 'Maria de Maeztu') through grant CEX2019- 000918-M. Publisher Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.
Keywords: Astrophysics - Astrophysics of Galaxies, Astrophysics - Solar and Stellar Astrophysics

Identifiers

Local EPrints ID: 449584
URI: http://eprints.soton.ac.uk/id/eprint/449584
ISSN: 0035-8711
PURE UUID: e53ff65e-6ef3-4107-970f-94c5653523d6
ORCID for P. Gandhi: ORCID iD orcid.org/0000-0003-3105-2615

Catalogue record

Date deposited: 08 Jun 2021 16:32
Last modified: 26 Nov 2021 03:03

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Contributors

Author: M. Fratta
Author: S. Scaringi
Author: J. E. Drew
Author: M. Monguio
Author: C. Knigge
Author: T. J. Maccarone
Author: J. M. C. Court
Author: K. A. Ilkiewicz
Author: A. F. Pala
Author: P. Gandhi ORCID iD
Author: B. Gaensicke

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