Adaptive-optics-assisted near-infrared spectroscopy of SVS 13 and its jet

Davis, C.J. and Nisini, B. and Takami, M. and Pyo, T.-S. and Smith, M.D. and Whelan, E. and Ray, T.P. and Chrysostomou, A. (2006) Adaptive-optics-assisted near-infrared spectroscopy of SVS 13 and its jet. Astrophysical Journal, 639 (2 I). pp. 969-974. ISSN 0004-637X. (doi:https://doi.org/10.1086/499557) (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/10.1086/499557

Abstract

We present long-slit H- and K-band spectroscopy of the low-mass outflow source SVS 13, obtained with the adaptive-optics-assisted imager-spectrometer NACO on the VLT. With a spatial resolution of <0?25 and a pixel scale of 0?027, we precisely establish the relative offsets of H2, [Fe H], CO, H I, and Na I components from the source continuum. The H 2 and [Fe II] peaks are clearly associated with the jet, while the CO, H I, and Na I peaks are spatially unresolved and coincident with the source, as is expected for emission associated with accretion processes. The H 2 profile along the slit is resolved into multiple components, which increase in size, although they decrease in intensity, with distance from the source. This trend might be consistent with thermal expansion of packets of gas ejected during periods of increased accretion activity. Indeed, for the brightest component nearest the source, proper-motion measurements indicate a tangential velocity of 0?028 yr-1. It therefore seems unlikely that this emission peak is associated with a stationary zone of warm gas at the base of the jet. However, the same cannot be said for the [Fe II] peak, for which we see no evidence for motion downwind, even though radial velocity measurements indicate that the emission is associated with higher jet velocities. We postulate that the [Fe II] could be associated with a collimation shock at the base of the jet.

Item Type: Article
Uncontrolled keywords: ISM: Herbig-Haro objects, ISM: jets and outflows, Stars: individual (SVS 13) 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 09:32 UTC
Last Modified: 12 Aug 2015 13:04 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50108 (The current URI for this page, for reference purposes)
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