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

Verbeek K, Groot PJ, Scaringi S, Casares J, Corral-Santana JM, Deacon N, Drew JE, Gaensicke BT, Gonzalez-Solares E, Greimel R, Heber U, Napiwotzki R, Ostensen RH, Steeghs D, Wright NJ, Zijlstra A (2014)

Publication Type: Journal article

Publication year: 2014

Journal

Monthly Notices of the Royal Astronomical Society Oxford University Press

Book Volume: 438

Pages Range: 2-13

Article Number: stt1492

Journal Issue: 1

DOI: 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. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

Authors with CRIS profile

Ulrich Heber Naturwissenschaftliche Fakultät

Involved external institutions

Radboud University Nijmegen NL Netherlands (NL) Instituto de Astrofísica de Canarias (IAC) ES Spain (ES) Max-Planck-Institut für Radioastronomie / Max Planck Institute for Radio Astronomy DE Germany (DE) University of Hertfordshire GB United Kingdom (GB) University of Warwick GB United Kingdom (GB) University of Cambridge GB United Kingdom (GB) Karl-Franzens-Universität Graz AT Austria (AT) Katholieke Universiteit Leuven (KUL) / Catholic University of Leuven BE Belgium (BE) University of Manchester GB United Kingdom (GB)

How to cite

APA:

Verbeek, K., Groot, P.J., Scaringi, S., Casares, J., Corral-Santana, J.M., Deacon, N.,... Zijlstra, A. (2014). Ultraviolet-excess sources with a red/infrared counterpart: Low-mass companions, debris discs and QSO selection. Monthly Notices of the Royal Astronomical Society, 438(1), 2-13. https://doi.org/10.1093/mnras/stt1492

MLA:

Verbeek, Kars, et al. "Ultraviolet-excess sources with a red/infrared counterpart: Low-mass companions, debris discs and QSO selection." Monthly Notices of the Royal Astronomical Society 438.1 (2014): 2-13.

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