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Astron. Astrophys. 336, 116-122 (1998)

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The ISOPHOT far-infrared serendipity north ecliptic pole minisurvey *

M. Stickel 1, S. Bogun 1, D. Lemke 1, U. Klaas 1, 2, L.V. Tóth 1, 3, U. Herbstmeier 1, G. Richter 4, R. Assendorp 4, R. Laureijs 2, M.F. Kessler 2, M. Burgdorf , 2, C.A. Beichman 5, M. Rowan-Robinson 6 and A. Efstathiou 6

1 Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
2 ISO Science Operations Centre, Astrophysics Division, Space Science Department of ESA, Villafranca, P.O. Box 50727, E-28080 Madrid, Spain
3 Department of Astronomy of the Loránd Eötvös University, Ludovika tér 2., H-1083 Budapest, Hungary
4 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany
5 Infrared Processing and Analysis Center, JPL, California Institute of Technology, MS 100/22, Pasadena, CA 91125, USA
6 Imperial College of Science, Technology and Medicine, The Blackett Laboratory, Prince Consort Road, London SW7 2BZ, UK

Received 13 February 1998 / Accepted 24 March 1998


The ISOPHOT Serendipity Survey fills the otherwise unused slew time between ISO's fine pointings with measurements in an unexplored wavelength regime near 200 [FORMULA]. In order to test point source extraction software, the completeness of the detected objects as well as the astrophysical content we investigate a [FORMULA] field near the North ecliptic pole, dubbed ISOPHOT Serendipity Minisurvey field. A total of 21 IRAS point sources were detected on the Serendipity slews crossing the field. 19 of these objects are galaxies, one is a planetary nebula and one is an empty field without a bright optical counterpart. The detection completeness is better than 90% for IRAS sources brighter than 2 Jy at 100 [FORMULA] and better than 80% for sources brighter than 1.5 Jy. The source detection frequency is about 1 per [FORMULA] slew length, in agreement with previous estimations based on galaxy number counts. After the end of the ISO mission, about 4000 point sources are expected to be found in the Serendipity slews.

Key words: surveys – infrared: galaxies – infrared: general

* 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) and with the participation of ISAS and NASA. Members of the Consortium on the ISOPHOT Serendipity Survey (CISS) are MPIA Heidelberg, ESA ISO SOC Villafranca, AIP Potsdam, IPAC Pasadena, Imperial College London

Present address: Data Management and Operations Division, ESO, Karl-Schwarzschild-Str. 2, D-85748 Garching bei München

Send offprint requests to: M. Stickel

© European Southern Observatory (ESO) 1998

Online publication: July 7, 1998