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A Hyperluminous Galaxy at Z = 2.8 Found in a Deep Submillimetre Survey by R. J. Ivison; I. Smail; J.- F. Le Borgne; A. W. Blain; J.- P. Kneib; J. Bezecourt; T. H. Kerr; J. K. Davies is a Physics and Astronomy article available to read on EtoBox.

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We present a detailed study of SMM 0239910136, a hyperluminous, active galaxy selected from a submm survey of the distant Universe. This galaxy is the brightest source in the fields of six rich, lensing clusters, with a total area of 0.01 deg 2 , that we have mapped with a sensitivity of ϳ2 mJy beam 11 at 850 m. We identify a compact optical counterpart with an apparent magnitude of B ϳ 23 and a low surface-brightness companion ϳ3 arcsec away. Our spectroscopy shows that both components have the same redshift; z 1⁄4 2:803 Ϯ 0:003. The emission line widths, FWHM Ӎ 1000-1500 km s 11 , and line ratios, along with the compact morphology and high luminosity (M B Ӎ 124:0) of the galaxy, indicate that SMM 0239910136 contains a rare dust-embedded, narrow-line or type-2 active galactic nucleus (AGN). The source is gravitationally lensed by the foreground cluster, amplifying its apparent luminosity by a factor of 2.5, and our detailed lens model allows us to accurately correct for this. Taking the amplification into account, we estimate that SMM 0239910136 is intrinsically a factor of five times more luminous than IRAS F 10214+4724. Its far-infrared (FIR) and Ha luminosities and low surface-

Who reads A Hyperluminous Galaxy at Z = 2.8 Found in a Deep Submillimetre Survey?

Author

R. J. Ivison; I. Smail; J.- F. Le Borgne; A. W. Blain; J.- P. Kneib; J. Bezecourt; T. H. Kerr; J. K. Davies

Publisher

John Wiley and Sons; Oxford University Press; Oxford University Press (OUP) (ISSN 0035-8711)

Published

1998

Language

EN

Field

Physics and Astronomy (Physical Sciences)