Letter to the Editor

147 GHz VLBI observations: Detection of 3C 273 and 3C 279 on the 3100 km baseline Metsähovi – Pico Veleta

¹ IRAM, 300 rue de la Piscine, 38406 St. Martin d'Hères, France
² Metsähovi Radio Observatory, Metsähovintie 114, 02540 Kylmälä, Finland
³ Max–Planck–Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
⁴ Tuorla Observatory, Väisäläintie 20, 21500 Piikkiö, Finland
⁵ Onsala Space Observatory, 43920 Onsala, Sweden
⁶ ESO, Casilla 19001, Santiago 19, Chile & Observatorio Cerro Calan, Universidad de Chile, Santiago, Chile
⁷ IRAM, Nucleo Central, Avenida Divina Pastora 7, 18102 Granada, Spain

Corresponding author: A. Greve, greve@iram.fr

Received: 8 April 2002
Accepted: 12 June 2002

Abstract

We report a successful VLBI observation at 147 GHz (2.1 mm) on the 3 100 km long baseline between the telescopes at Metsähovi (Finland) and Pico Veleta (Spain). The sources 3C 273B and 3C 279 were detected with a SNR of . For these sources we estimate that 25–30% of the total flux is detectable as correlated flux on the 3 100 km baseline, which gives at 147 GHz a lower limit of the brightness temperature of the inner VLBI jet region of ~110¹⁰ K.