Near-infrared and optical observations of an obliquely viewed bow shock: AS 353A/HH 32

Davis, C.J. and Eisloffel, J. and Smith, M.D. (1996) Near-infrared and optical observations of an obliquely viewed bow shock: AS 353A/HH 32. Astrophysical Journal, 463 (1 P.1). pp. 246-253. ISSN 0004-637X. (doi:https://doi.org/10.1086/177237) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1086/177237

Abstract

High-resolution infrared maps and echelle spectroscopy of the emission from warm molecular hydrogen in the AS 353A/HH 32 outflow are presented. H2 v = 1-0 S(1) images are compared with high-quality optical [S II] ??6716,6731, H?, and I-band images; we find that H2 line emission "envelopes" the HH 32A bow shock, extending downwind beyond its western edge. The H2 v = 1-0 S(1) line profiles in HH 32 are all single peaked and Gaussian or triangular in shape. The lines are rather narrow, typically 20-30 km s-1 (including instrumental smoothing), with peaks that are redshifted by ?8-25 km s-1 relative to the source radial velocity. Although the H2 data infer low velocities, we nevertheless find that the data are consistent with the high-velocity bow shock models (V ? 300-350 km s-1; 0 ? 15°-30° to the line of sight) used to interpret earlier optical data. We also report the discovery of three new Herbig-Haro objects. Designated HH 332, these features are evident only in our [S II] and H? images and not in our I-band image (they are not detected in H2). They are therefore regarded as bona fide HH objects associated with a previously unknown outflow.

Item Type: Article
Uncontrolled keywords: Individual (AS 353A/HH 32) - ISM, ISM, Jets and outflows -ISM, Kinematics and dynamics - Shock waves - Stars, Pre-main-sequence
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Giles Tarver
Date Deposited: 11 Aug 2015 10:39 UTC
Last Modified: 12 Aug 2015 16:21 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50159 (The current URI for this page, for reference purposes)
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