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Fig. 1

image

Intensity map of the entire field around ϵ Eridani observed at λ = 1.2 mm with MAMBO in November 2007 at Pico Veleta (IRAM 30 m radiotelescope). A ring is clearly apparent in the central region of the map centered on the position of ϵ Eridani on 15 November 2007 (α = 3h32m55.32s and δ = −9°27′29.7′′). The point source interior to the ring is within one pixel from the map center coincidental with the photosphere of ϵ Eridani. Within 50′′ from the map center, the noise rms is 0.81 mJy/11′′ beam, and the peak brightness is 3.1 mJy/11′′ beam. Over the whole map, the noise increases with distance from the center because of the scanning law of the telescope. The color code is blue, purple, red, orange, yellow, and white for increasing positive intensity and black for all negative intensities. The pixel size is 3.5′′, and the noise is uncorrelated across pixels.

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