Near-IR imaging of the molecular outflows in HH24-26, L1634(HH240-241), L1660(HH72) and RNO15FIR.

Details Near-IR imaging of the molecular outflows in HH24-26, L1634(HH240-241), L1660(HH72) and RNO15FIR. Near-IR imaging of the molecular outflows in HH24-26, L1634(HH240-241), L1660(HH72) and RNO15FIR.

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...324..263d&link_type=abstract

Astronomy and Astrophysics, v.324, p.263-275

Astronomy and Astrophysics

Astrophysics

62

Ism: Jets And Outflows, Infrared: Ism: Lines And Bands, Ism: Hh 24-26, L 1634 = Ldn 1634 (Hh 240-241), L 1660, Rno 15 Fir (Iras 03245+3002)

Scientific paper

Narrow-band images in H_2_ v=1-0S(1) (2.122μm) and adjacent continuum (2.104μm) are presented of a number of outflows that are driven by young, deeply embedded sources. We report the detection of a H_2_ outflow associated with the Class 0 source in the HH24-26 region, HH24-MMS, as well as extensive H_2_ line emission in the HH25 and HH26 CO outflows. In L1634 a sequence of well-defined molecular bow shocks in the blue-shifted outflow lobe points to variability in the flow velocity, while in L1660, the poorly aligned H_2_ 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 RNO15FIR. These observations provide evidence that molecular outflows from young stars are driven by collimated jets. Indeed, in H_2_, 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 H_2_.

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