BL Lacertae

BL Lacertae is an active galactic nuclei (AGN). It was discovered by Hoffmeister (1929) in 1929. In 1974, Oke & Gunn (1974) measured the redshift of BL Lacertae as z = 0.07 (∼0.9 Gly ∼ 0.276 Gpc), it is a recession velocity of 21,000 km/s with respect to the Milky Way. It is in the constellation Lacerta, with R. A = 22h 02m 43.3s, Dec. = +42° 16’ 40”, and apparent magnitude (V) var. ∼14 to ∼17 (Miller et al. 1978).

Sloan Digital Sky Survey image of BL Lacertae

The figure shows panels of radio, optical, X-ray, and Gamma-ray light curves, waveforms of the sonification as a function of time, and spectrograms of the blazar BL Lacertae. The light curves are available at: Download Light curves.

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References

Hoffmeister, C. (1929). 354 neue Veränderliche. Astronomische Nachrichten, 236, 233.
Oke, J. B., & Gunn, J. E. (1974). The distance of BL Lacertae. The Astrophysical Journal, 189, L5.
Miller, J. S., French, H. B., & Hawley, S. A. (1978). The spectrum and magnitude of the galaxy associated with BL Lacertae. The Astrophysical Journal, 219, L85-L87.