ar X iv : a st ro - p h / 98 11 40 1 v 1 2 5 N ov 1 99 8 Role of Starbursts in LINERs

We report our preliminary results on the role of starbursts in LINERs by use of WR galaxies as a tool. The essence of this approach lies in the different FIR-radio relation of WR galaxies from the pure AGN's. The energetics of LINERs has been a controversial issue since their definition by Heckman (1980). In recent years, several LINERs have been observed by HST, or large ground-base facilities, and unambiguous evidence has been found for their energetics (see, e.g. Ho 1998; Maoz 1998 and references therein). Ho favours the point of the low-luminosity end of the AGN phenomena for the majority of LINERs, while Maoz argues for the nuclear starbursts on the other hand (see, also Heckman, this Proceedings). We have found that the different FIR-radio relation of WR galaxies from the pure AGN's could serve as a tool to classify the energetics of LINERs, a tight FIR-radio correlation for known WR galaxies implies that both FIR and radio emission for these sources are controlled by ongoing star-formation activities. basically illustrate a same FIR-radio correlation as WR galaxies, with lower radio emission in general (see Fig. 1), and LINERs whose energy sources are composed show a same FIR-radio relation as the majority of Sy1 galaxies, distinct from the FIR-radio correlation for WR galaxies (see Fig. 2). M81 is a source that Ho claims to be an AGN (Ho, 1998), however, Maoz thought that the contribution from massive stars could not be excluded (Maoz, 1998). According to our analysis, M81 is a composite object, consistent with the results obtained from ROSAT data (Colbert & Mushotzky, 1998). NGC6500 was considered as a composite object (Barth et al 1997), though it is located definitely in the AGN regime in Fig 1, in accordance with the new results by Falcke et al (1998). Several kinds of predictions could be given based on this method, e.g. some Sy galaxies may be powered by central black holes and their nuclear starbursts, as well as classification of LINERs' energetics, and further study of the approach we proposed here is underway.