QSO-candidates in OGLE-II Galactic bulge fields (Sumi+, 2005)

Details QSO-candidates in OGLE-II Galactic bulge fields (Sumi+, 2005) QSO-candidates in OGLE-II Galactic bulge fields (Sumi+, 2005)

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ycat..83560331s&link_type=abstract

VizieR On-line Data Catalog: J/MNRAS/356/331. Originally published in: 2005MNRAS.356..331S

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Qsos, Photometry: Ccd

Scientific paper

We present 97 QSO candidates in 48 Galactic bulge fields of the Optical Gravitational Lensing Experiment II (OGLE-II) covering ~11deg2, which are selected via their variability. We extend light curves of variable objects which were detected in a 3-yr baseline in the OGLE-II variable star catalogue to fourth year. We search for objects that are faint (160<18.5) and slowly variable over 4-yr in this catalogue by using the variogram/structure function. Finding the QSOs in such stellar-crowded and high extinction fields is challenging, but should be useful for the astrometric reference frame. Spectroscopic follow-up observations are required to confirm these QSO candidates. Follow-up observations are being prepared for four of these fields (BUL_SC1, 2, 32 and 45). Follow-up observations for other fields are strongly encouraged. The complete list and light curves of all 97 candidates are available in electronic format at http://www.astro.princeton.edu/sumi/QSO-OGLEII/ .
(1 data file).

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