Cj. Davis et al., NEAR-INFRARED AND OPTICAL OBSERVATIONS OF AN OBLIQUELY VIEWED BOW SHOCK - AS-353A HH-32/, The Astrophysical journal, 463(1), 1996, pp. 246
High-resolution infrared maps and echelle spectroscopy of the emission
from warm molecular hydrogen in the AS 353A/HH 32 outflow are present
ed. H-2 nu = 1-0 S(1) images are compared with high-quality optical [S
II] lambda lambda 6716,6731, H alpha, and I-band images; we find that
H-2 line emission ''envelopes'' the HH 32A bow shock, extending downw
ind beyond its western edge. The H-2 nu = 1-0 S(1) line profiles in HH
32 are all single peaked and Gaussian or triangular in shape. The lin
es are rather narrow, typically 20-30 km s(-1) (including instrumental
smoothing), with peaks that are redshifted by similar to 8-25 km s(-1
) relative to the source radial velocity. Although the H-2 data infer
low velocities, we nevertheless find that the data are consistent with
the high-velocity bow shock models (V similar to 300-350 km s(-1); th
eta similar to 15 degrees-30 degrees to the line of sight) used to int
erpret earlier optical data. We also report the discovery of three new
Herbig-Haro objects. Designated HH 332, these features are evident on
ly in our [S II] and H alpha images and not in our I-band image (they
are not detected in H-2). They are therefore regarded as bona fide HH
objects associated with a previously unknown outflow.