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2.1. Observations

The observations were carried out on September 7 and 8, 2002, with the imager/spectrograph DoLoRes at the 3.52m Italian telescope Telescopio Nazionale Galileo (TNG) in La Palma (Canary Island, Spain). DoLoRes is equipped with a 2048 × 2048 pixel thinned and back-illuminated Loral CCD array with a total field of view of 9'.4 × 9'.4, and a scale of 0.275 "/px. The seeing was remarkably good and stable, ranging between 0.8" and 1.1" FWHM for all the scientific images.

Two fields were imaged along the minor axes in V and I filters. The locations of the fields are shown in Figure 1 and listed in Table 1 along with the date, the filter and the exposure time of all the scientific exposures. A total of 7 V and 6 I 600 s exposures have been acquired for the inner field (Field 1, hereafter F1) and 8 V and 6 I 600 s for the outer field (Field 2, hereafter F2). The distance of the field center from the center of the galaxy is appeq 15' for F1 and appeq 28' for F2.

Table 1. Log of the observations

Field RA (J2000) Dec (J2000) Date Filt. Exp T(s)

F1 01 32 44.85 +30 45 02.5 Sept,7,02 V 3x600
      Sept,7,02 I 3x600
      Sept,8,02 V 4x600
      Sept,8,02 I 3x600
F2 01 31 44.97 +30 45 00.0 Sept,7,02 V 5x600
      Sept,7,02 I 4x600
      Sept,8,02 V 3x600
      Sept,8,02 I 2x600

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