Other
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.283..746a&link_type=abstract
Nature, vol. 283, Feb. 21, 1980, p. 746, 747.
Other
8
Bl Lacertae Objects, Extragalactic Radio Sources, Infrared Spectra, Periodic Variations, Power Spectra, Spectrum Analysis, Variable Stars, Astronomical Spectroscopy, Calibrating
Scientific paper
Spectral observations intended to clarify the nature of the flat-spectrum variable radio source 0406+121 are reported. A spectrum was obtained between 4950 and 7950 A using a 2.25-m telescope and an intensified Reticon spectrograph. The spectrum obtained is shown to be consistent with a smoothly rising featureless continuum characteristic of BL Lac objects, however the power law index derived for the spectrum reveals it to be redder than any other BL Lac object. The object also appears to lack variability in the optical range, while exhibiting it in the near-IR, indicating an atypical decoupling between the optical and near-IR continua. 0406+121 is observed to be similar to AO 0235+164 and BL Lac in the apparent spectral inflection point between the optical and near-IR, and further observations of the redder object are recommended in order to determine whether 0406+121 represents an extreme example of a BL Lac object or a truly unique category.
Aaronson Marc
Boroson Todd
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