SIMBAD references

2013A&A...551A.104R - Astronomy and Astrophysics, volume 551A, 104-104 (2013/3-1)

Flux and color variations of the doubly imaged quasar UM 673.

RICCI D., ELYIV A., FINET F., WERTZ O., ALSUBAI K., ANGUITA T., BOZZA V., BROWNE P., BURGDORF M., CALCHI NOVATI S., DODDS P., DOMINIK M., DREIZLER S., GERNER T., GLITRUP M., GRUNDAHL F., HARDIS S., HARPSOE K., HINSE T.C., HORNSTRUP A., HUNDERTMARK M., JORGENSEN U.G., KAINS N., KERINS E., LIEBIG C., MAIER G., MANCINI L., MASI G., MATHIASEN M., PENNY M., PROFT S., RAHVAR S., SCARPETTA G., SAHU K., SCHAEFER S., SCHOENEBECK F., SCHMIDT R., SKOTTFELT J., SNODGRASS C., SOUTHWORTH J., THOENE C.C., WAMBSGANSS J., ZIMMER F., ZUB M. and SURDEJ J.

Abstract (from CDS):

With the aim of characterizing the flux and color variations of the multiple components of the gravitationally lensed quasar UM673 as a function of time, we have performed multiepoch and multiband photometric observations with the Danish 1.54m telescope at the La Silla Observatory. The observations were carried out in the VRi spectral bands during four seasons (2008-2011). We reduced the data using the point spread function photometric technique as well as aperture photometry. Our results show for the brightest lensed component some significant decrease in flux between the first two seasons (+0.09/+0.11/+0.05mag) and a subsequent increase during the following ones (-0.11/-0.11/-0.10mag) in the V/R/i spectral bands, respectively. Comparing our results with previous studies, we find smaller color variations between these seasons as compared with previous ones. We also separate the contribution of the lensing galaxy from that of the fainter and close lensed component.

Abstract Copyright: ∼

Journal keyword(s): gravitational lensing: strong - quasars: general - techniques: photometric - quasars: individual: UM673

VizieR on-line data: <Available at CDS (J/A+A/551/A104): tablevri.dat>

CDS comments: The reference stars R, S, T, U, V and field galaxies G1 and G2 (Fig.1) are not in Simbad.

Simbad objects: 9

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