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4U0241+61: a luminous low-redshift QSO

Nature volume 273, pages 450–453 (1978)Cite this article

Abstract

A PRECISE (30″) celestial position for the faint (1.8 µJy, 2–11 keV) X-ray source 4U0241+61 (ref. 1) and its identification at optical and radio wavelengths are reported here. Despite its low galactic latitude (bII = +2.4), the source is extragalactic: a luminous (Mv = −25.8±1.8), low-redshift (z = 0.0438) QSO with relatively intense radio emission (0.2–;0.5 Jy).

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Authors and Affiliations

  1. Tata Institute of Fundamental Research, Bombay, India

    K. M. V. APPARAO

  2. Laboratorio di Fisica Cosmica e Tecnologie Relative, CNR, Milan, Italy

    G. F. BIGNAMI & L. MARASCHI

  3. Harvard/Smithsonian Center for Astrophysics, Cambridge, Massachusetts, 02138

    H. HELMKEN

  4. Department of Astronomy, University of California, Los Angeles, California, 90024

    B. MARGON

  5. National Radio Astronomy Observatory, VLA Project, Socorro, New Mexico, 87801

    R. HJELLMING

  6. Center for Space Research and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139

    H. V. BRADT & R. G. DOWER

Authors
  1. K. M. V. APPARAO
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  2. G. F. BIGNAMI
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  3. L. MARASCHI
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  4. H. HELMKEN
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  6. R. HJELLMING
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  7. H. V. BRADT
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  8. R. G. DOWER
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APPARAO, K., BIGNAMI, G., MARASCHI, L. et al. 4U0241+61: a luminous low-redshift QSO. Nature 273, 450–453 (1978). https://doi.org/10.1038/273450a0

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