Spectroscopic follow-up of a subset of the Gaia/IPHAS catalogue of Hα-excess sources.

Autor: Fratta, M, Scaringi, S, Monguió, M, Pala, A F, Drew, J E, Knigge, C, Iłkiewicz, K A, Gandhi, P
Předmět:
Zdroj: Monthly Notices of the Royal Astronomical Society; 1/22/2023, Vol. 518 Issue 3, p3301-3311, 11p
Abstrakt: State-of-the-art techniques to identify Hα emission-line sources in narrow-band photometric surveys consist of searching for  Hα excess with reference to nearby objects in the sky (position-based selection). However, while this approach usually yields very few spurious detections, it may fail to select intrinsically faint and/or rare Hα-excess sources. In order to obtain a more complete representation of the heterogeneous emission-line populations, we recently developed a technique to find outliers relative to nearby objects in the colour–magnitude diagram (CMD-based selection). By combining position-based and CMD-based selections, we built an updated catalogue of Hα-excess candidates in the Northern Galactic Plane. Here, we present spectroscopic follow-up observations and classification of 114 objects from this catalogue that enables us to test our novel selection method. Out of the 70 spectroscopically confirmed Hα-emitters in our sample, 15 were identified only by the CMD-based selection, and would have been thus missed by the classic position-based technique. In addition, we explore the distribution of our spectroscopically confirmed emitters in the Gaia CMD. This information can support the classification of emission-line sources in large surveys such as the upcoming WEAVE and 4-m Multi-Object Spectroscopic Telescope , especially if augmented with the introduction of other colours. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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