Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...306..267s&link_type=abstract
Astronomy and Astrophysics, v.306, p.267
Astronomy and Astrophysics
Astrophysics
24
Circumstellar Matter, Ism: Molecules, Ism: Individual Objects: Iras 06058+2138, Iras 06061+2151, Radio Lines: Ism
Scientific paper
We have selected 67 objects for observation that are presumably massive young stellar objects. They were from the IRAS Point Source Catalogue based on their infrared flux (Fnu_>=500Jy at 100μm). All objects have been surveyed in the NH_3_(1,1) and (2,2) lines, and a subsample of 53 objects in the rotational line of HCO^+^(J=1-0). 25 objects (37%) were detected in the NH_3_(1,1) line, 18 objects (27%) in the NH_3_(2,2) line, and 38 objects (72%) in the HCO^+^ line. Two objects, IRAS 06058+2138 and IRAS 06061+2151, have been mapped in the two ammonia transitions. From the molecular line data, we have derived the kinetic temperature T_kin_ and the NH_3_ column densities. These data were combined with data from the literature and data derived from the IRAS fluxes (dust colour temperature T_d_, optical depth τ, luminosity). No clear correlations were found; the data are, however, consistent with least square fits found by Wouterloot et al. (1988a). The probability to detect H_2_O maser sources is strongly correlated with the detection of NH_3_ emission: Water maser emission has been seen towards 83% of those objects with clear detections of NH_3_(1,1) and (2,2) lines.
Harjunpaeae P.
Henning Th
Koempe Carsten
Schreyer Katharina
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