SIMBAD references

2015MNRAS.449.2750L - Mon. Not. R. Astron. Soc., 449, 2750-2758 (2015/May-3)

Colour variation of the BL Lacertae object PKS 0537-441.

LI X., ZHANG L., LUO Y., WANG L. and ZHOU L.

Abstract (from CDS):

We present the colour indices V - R of BL Lacertae object PKS 0537-441 on the basis of the photometric data monitored by the Rapid Eye Mounting (REM) telescope located at the ESO Cerro La Silla observatory (Chile). Nearly 700 quasi-simultaneous data groups were collected during the period from 2004 to 2010. Our colour analysis shows the existence of at least two variability mechanisms: one is the long-term chromatic mechanism in which the variation traces a 0.04±0.01 slope in the V - R versus V plot, the other is the chromatic mechanism implying the spectral changes during the flares and on intraday time-scales. A general bluer-when-brighter trend is confirmed in both ascent and descent states during the flares and in the 2010 February flare interval, while a much stronger bluer-when-brighter chromatism is observed in both faint and bright states on intraday time-scales. The discrete correlation function analysis reveals the existence of a time-lag of 13^+5.8_-1.2 d between colour indices and magnitudes during the period MJD 54404-54453, whereas no measurable time-lag during other periods is found. Our results suggest that geometric effects may be responsible for the long-term achromatic mechanism, while the intrinsic shock-in-jet mechanism may produce the chromatic variability during the flares and on intraday time-scales.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): galaxies: active - BL Lacertae objects: general - BL Lacertae objects: individual: PKS 0537-441 - galaxies: fundamental parameters

VizieR on-line data: <Available at CDS (J/MNRAS/449/2750): table1.dat>

Simbad objects: 9

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2019.09.23-23:03:51

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