Ultraviolet-excess sources with a red/infrared counterpart: low-mass companions, debris discs and QSO selection

Zijlstra, Albert; Wright, Nicholas J.; Steeghs, Danny; Østensen, Roy H.; Napiwotzki, Ralf; Heber, Ulrich; Greimel, Robert; González-Solares, Eduardo; Gänsicke, Boris T.; Drew, Janet E.; Deacon, Niall; Corral-Santana, J. M.; Casares, J.; Scaringi, Simone; Groot, Paul J.; Verbeek, K.
Referencia bibliográfica

Monthly Notices of the Royal Astronomical Society, Volume 438, Issue 1, p.2-13

Fecha de publicación:
2
2014
Número de autores
16
Número de autores del IAC
2
Número de citas
10
Número de citas referidas
7
Descripción
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.
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