We present first results of recent NIR-observations of dwarf galaxies with the ESO/MPI 2.2 m telescope at La Silla/Chile. The images were obtained in November 1997 with the IRAC2b CCD-camera using J, H and K' filters. With an applied scale of 0.507 arcsec pix^-1 we achieved a field size of 129"×129". Due to the fact that we are dealing with extended sources we use the technique of position-switching to get useful images for sky-subtraction.

In total 14 galaxies were observed which belong to two different dwarf galaxy samples. These were chosen from the catalogues of Feitzinger & Galinski (FG) and Melisse & Israel (MI). From FG we selected galaxies with luminosities in the range of m_b = 12 ... 14, from MI galaxies with IRAS-fluxes >1000 mJy at 100 µm. We observed 4 galaxies belonging to the optical sample (FG) and 11 of the FIR-sample (MI). Typical integration times varied from 900 to 3600 s. Additionally CO-observations of the FIR-sample were made with the SEST (Swedish ESO Submillimeter Telescope) telescope at La Silla (see M. Albrecht in these proceedings).

Here we show J-H and J-B colours by using the scans of Lauberts & Valentijn (1989) for the B photometry.

All galaxies, which were detected by IRAS, present high S/N ratios in the near-infrared, whereas three galaxies of the optically selected FG-sample were undetectable.

Observed galaxies:
UGCA 438, NGC 1602, NGC 7162, ESO 546-34, NGC 7107, NGC 1879, NGC 1427A, NGC 145, NGC 178, NGC 899, NGC 1140, UGCA 106, DDO 230, ESO 245-005

References

• Feitzinger J.V., Galinski Th., 1985, A&AS 61, 503-515
• Lauberts A., Valentijn E.A., 1989, ``The Surface Photometry Catalogue of the ESO-Uppsala Galaxies'', Univ. Minnesota
• Melisse J.P.M., Israel F.P., 1994, A&AS 103, 391-412

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