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Published August 1, 1981 | Published
Journal Article Open

Extremely red compact radio sources - The empty field objects


10 μm radiation .has been detected from 1413 + 135, one of the very red objects discovered by Rieke, Lebofsky, and Kinman at near-infrared wavelengths. The spectrum of this object flattens at wavelengths longer than 2.2 μm. Upper limits are also given for the 10 μm emission from 2255 + 14, 0026 + 34, and 0406+ 121. Photometry between 1.25 and 2.2 μm confirms the variability of 1413+135 2255+41, and 0406+121. Five percent resolution spectra of 1413+135 and 0406+ 121 between 1.5 and 2.4 μm. show no emission or absorption lines. The spectral data rule out the possibility that 1413+135 is a quasar with normal line strengths and a redshift 1.3 > z > 4. The lack of features of the 1.5-2.4 μm spectra, the rapid variability, and the overall shape of the radio, infrared, and X-ray energy distributtions are consistent with a BL Lac nature for these objects.

Additional Information

© 1981 American Astronomical Society. Received 1980 November 24; accepted 1981 February 9. We thank the staffs at Mauna Kea, Palomar, and Owens Valley for their assistance, particularly night assistants Ron Koehler, Barbara Schaeffer, and Juan Carrasco. Dr. J. Bregman communicated X-ray data in advance of publication and offered several useful comments. Drs. G. Rieke and M. Lebofsky kindly provided positions for a number of guide stars near the infrared sources. We thank Dr. Rieke for a critical reading of the manuscript and Dave Ennis for useful discussions. Dr. D. Worrall brought the optical properties of X-ray selected BL Lac objects to our attention. D. Garrett and E. Bozyan communicated 85 cm data in advance of publication. The work reported here was supported in part by grants from NASA and NSF.

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Published - 1981ApJ___247__780B.pdf


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August 19, 2023
March 5, 2024