A refined QSO selection method using diagnostics

Dae Won Kim, Pavlos Protopapas, Markos Trichas, Michael Rowan-Robinson, Roni Khardon, Charles Alcock, Yong Ik Byun

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

We present 663 QSO candidates in the Large Magellanic Cloud (LMC) that were selected using multiple diagnostics. We started with a set of 2,566 QSO candidates selected using the methodology presented in our previous work based on time variability of the MACHO LMC light curves. We then obtained additional information for the candidates by cross-matching them with the Spitzer SAGE, the 2MASS, the Chandra, the XMM, and an LMC UBVI catalogues. Using that information, we specified diagnostic features based on mid-IR colours, photometric redshifts using SED template fitting, and X-ray luminosities, in order to discriminate more high-confidence QSO candidates in the absence of spectral information. We then trained a one-class Support Vector Machine model using those diagnostics features. We applied the trained model to the original candidates, and finally selected 663 high-confidence QSO candidates. We cross-matched those 663 QSO candidates with 152 newly-confirmed QSOs and 275 non-QSOs in the LMC fields, and found that the false positive rate was less than 1%.

Original languageEnglish
Title of host publicationNew Horizons in Time-Domain Astronomy
EditorsElizabeth Griffin, Robert J. Hanisch, Robert L. Seaman
Pages344-346
Number of pages3
EditionS285
DOIs
Publication statusPublished - 2011 Sep

Publication series

NameProceedings of the International Astronomical Union
NumberS285
Volume7
ISSN (Print)1743-9213
ISSN (Electronic)1743-9221

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'A refined QSO selection method using diagnostics'. Together they form a unique fingerprint.

Cite this