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Astron. Astrophys. 331, 853-856 (1998)

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ISO observations of the radio-loud BALQSO 1556+3517 *

J. Clavel

ISO Science Operations Center, Astrophysics Division, ESA Space Science Department, P.O. Box 50727, E-28080 Madrid, Spain

Received 12 September 1997 / Accepted 25 November 1997


To date, the quasar 1556+3517 is the only radio loud Broad Absorption Line QSO (BALQSO; Becker et al. 1997). This prompted narrow band filter imaging observations in the range 4-15 µ with the ISO satellite. The source is clearly detected in all filters and appears point-like and isolated at the resolution of ISO. The overall Spectral Energy Distribution (SED) in [FORMULA] peaks at a rest wavelength [FORMULA] and is reddened by 1.6 visual magnitudes. Correction for reddening brings 1556+3517 within 1.3 sigma from the [FORMULA] dividing line between radio-loud and radio-quiet sources. The mid-IR luminosity integrated over the 1.8-6 µ rest wavelength range is [FORMULA] ([FORMULA]), which requires at least [FORMULA] of dust and [FORMULA] of associated gas. It is unlikely that such a large mass stems from the BAL wind itself.

Key words: quasars: absorption lines – quasars: individual: 1556+3517 – infrared: galaxies

* Based on observations with ISO, an ESA project with Instruments funded by ESA member states (especially the PI countries: France, Germany, The Netherlands and the United Kingdom) with the participation of ISAS and NASA

Send offprint requests to: J. Clavel (jclavel@iso.vilspa.esa.es)

© European Southern Observatory (ESO) 1998

Online publication: March 3, 1998