Multifrequency study of HH 137 and HH 138: Discovering new knots and molecular outflows with Gemini and APEX

FERRERO, L. V. ; CAPPA, C. E. ; SALDAÑO, H. P.; GOMEZ, M.; RUBIO, M. ; GUNTHARDT, G.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2020 vol. 496 p. 4239 - 4239

0035-8711

e present a multi-wavelength study of two HH objects (137 and 138) that may be associated. We use Gemini H_2 (2.12 micron) and K (2.2 micron) images, as well as APEX molecular line observations and Spitzer image archives. Several H_2 knots, linked to the optical chain of knots of HH 137, are identified in the Gemini and Spitzer 4.5 micron images. New shock excited regions related to the optical knots delineating HH 138 are also reported. In addition, a bright 4.5 micron 0.09 pc-long arc-shaped structure, roughly located mid-way between HH 137 and HH 138, is found to be associated with two Spitzer Class I/II objects, which are likely to be the exciting stars. These sources are almost coincident with a high-density molecular clump detected in 12^CO(3-2), 13^CO(3-2), C18^O(3-2), HCO^+(3-2) and HCN(3-2) molecular lines with an LTE mass of 36 M_Sun. The 12^CO(3-2) emission distribution over the observed region reveals molecular material underlying three molecular outflows. Two of them (out