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Astron. Astrophys. 328, 702-705

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Search for brightness fluctuations in the zodiacal light at 25 µm with ISO*

Péter Ábrahám1,2, Christoph Leinert1, and Dietrich Lemke1

1Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
2Konkoly Observatory of the Hungarian Academy of Sciences, P.O.Box 67, H-1525 Budapest, Hungary

Received 16 April 1997 / Accepted 5 August 1997


We mapped at 25 µm five $\approx$0.5$^{\circ}$$\times$0.5$^{\circ}$ fields at low, intermediate and high ecliptic latitude with the photometer onboard the Infrared Space Observatory. The goal was to search for potential structures in the zodiacal light. No structures were seen in these five sample fields. For an aperture of 3' diameter we find an upper limit for the underlying rms brightness fluctuations of $\pm$0.2%, which corresponds at high ecliptic latitudes to $\pm$0.04 MJy/sr or $\pm$25mJy in the beam.

Key words: interplanetary medium - infrared: solar system - diffuse radiation

*Based on observations with ISO, an ESA project with instruments funded by ESA member states (especially the P/I countries France, Germany, the Netherlands and the United Kingdom) with participation of ISAS and NASA.

Send offprint requests to: Peter Abraham

© European Southern Observatory (ESO) 1997

Online publication: November 24, 1997
Last change: March 26, 1998