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Ultraviolet-excess sources with a red/infrared counterpart : low-mass companions, debris discs and QSO selection
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Verbeek, K. , Groot, P. J., Scaringi, S., Casares, J., Corral-Santana, J. M., Deacon, N., Drew, J. E., Gänsicke, B. T. (Boris T.), Gonzalez-Solares, E., Greimel, R., Heber, U., Napiwotzki, R., Ostensen, R. H., Steeghs, D., Wright, N. J. and Zijlstra, A. (2013) Ultraviolet-excess sources with a red/infrared counterpart : low-mass companions, debris discs and QSO selection. Monthly Notices of the Royal Astronomical Society , Volume 438 (Number 1). pp. 2-13. doi:10.1093/mnras/stt1492 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stt1492
Abstract
We present the result of the cross-matching between ultraviolet (UV)-excess sources selected from the UV-Excess Survey of the Northern Galactic Plane (UVEX) and several infrared (IR) surveys (2MASS, UKIDSS and WISE). From the position in the (J − H) versus (H − K) colour–colour diagram, we select UV-excess candidate white dwarfs with an M-dwarf type companion, candidates that might have a lower mass, brown-dwarf type companion and candidates showing an IR-excess only in the K band, which might be due to a debris disc. Grids of reddened DA+dM and sdO+MS/sdB+MS model spectra are fitted to the U, g, r, i, z, J, H, K photometry in order to determine spectral types and estimate temperatures and reddening. From a sample of 964 hot candidate white dwarfs with (g − r) < 0.2, the spectral energy distribution fitting shows that ∼2–4 per cent of the white dwarfs have an M-dwarf companion, ∼2 per cent have a lower-mass companion, and no clear candidates for having a debris disc are found. Additionally, from WISE six UV-excess sources are selected as candidate quasi-stellar objects (QSOs). Two UV-excess sources have a WISE IR-excess showing up only in the mid-IR W3 band of WISE, making them candidate luminous infrared galaxies (LIRGs) or Sbc starburst galaxies.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||
| Publisher: | Oxford University Press | ||||||||
| ISSN: | 0035-8711 | ||||||||
| Official Date: | 6 August 2013 | ||||||||
| Dates: |
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| Volume: | Volume 438 | ||||||||
| Number: | Number 1 | ||||||||
| Page Range: | pp. 2-13 | ||||||||
| DOI: | 10.1093/mnras/stt1492 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access |
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