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Astron. Astrophys. 324, 263-275 (1997)

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Near-IR imaging of the molecular outflows in HH 24-26, L 1634 (HH 240-241), L 1660 (HH 72) and RNO 15 FIR

C.J. Davis 1, T.P. Ray 1, J. Eislöffel 2 and D. Corcoran 1

1 School of Cosmic Physics, Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland (cdavis@cp.dias.ie, tr@cp.dias.ie)
2 Thüringer Landessternwarte, Karl-Schwarzschild-Observatorium, D-07778 Tautenburg, Germany (eisloeff@tls-tautenburg.de)

Received 17 July 1996 / Accepted 13 January 1997


Narrow-band images in H2 v=1-0 S(1) (2.122 µm) and adjacent continuum (2.104 µm) are presented of a number of outflows that are driven by young, deeply embedded sources. We report the detection of a H2 outflow associated with the Class 0 source in the HH 24-26 region, HH 24-MMS, as well as extensive H2 line emission in the HH 25 and HH 26 CO outflows. In L 1634 a sequence of well-defined molecular bow shocks in the blue-shifted outflow lobe points to variability in the flow velocity, while in L 1660, the poorly aligned H2 knots suggest a wide outflow opening angle and perhaps also a variable flow direction. We also report the discovery of a highly collimated molecular jet associated with the embedded source RNO 15 FIR.

These observations provide evidence that molecular outflows from young stars are driven by collimated jets. Indeed, in H2, we likely observe the molecular shocks which sweep up ambient gas to form the associated CO outflows. We find, however, no obvious correlation between the presumed age of the source of each outflow (based on its IR excess), and the length or luminosity of the flow in H2.

Key words: ISM: jets and outflows – infrared: ISM: lines and bands – ISM: HH 24-26; L 1634 (HH 240-241); L 1660 (HH 72); RNO 15 FIR

Send offprint requests to: C.J. Davis

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© European Southern Observatory (ESO) 1997

Online publication: May 26, 1998