Abstract
In this paper, the long-term ( about 20 years) near-infrared data have been compiled from the published literature for BL Lac object PKS 0735+178; The light curve in the infrared (JHK) bands have been presented; The maximum variations of Δ J=2m .47, Δ H=2m .30, and Δ K = 2m.40, and color indices of J- H=0.86 ± 0.11, J- K=1.71 ± 0.16, and H-K = 0.86 ± 0.12 have been obtained from the data. It is found that the spectrum changes with the brightness of the source in the infrared bands; The variations in the optical and infrared bands are found to be correlated suggesting that the emission mechanisms in the two bands are associated.
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Lin, R., Fan, J. Infrared Variation of BL Lacertae Object PKS 0735+178. Astrophysics and Space Science 259, 67–75 (1998). https://doi.org/10.1023/A:1001519210671
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DOI: https://doi.org/10.1023/A:1001519210671