Imaging of HH80-81 jet in the NIR shock tracers H${}_2$ and [Fe II]

Abstract

The HH80-81 system is one of the most powerful jets driven by a massive protostar. We present new near-infrared (NIR) line imaging observations of the HH80-81 jet in the H${}_2$ (2.122 $\mu$m) and [Fe II] (1.644 $\mu$m) lines. These lines trace not only the jet close to the exciting source but also the knots located farther away. We have detected nine groups of knot-like structures in the jet including HH80 and HH81 spaced $0.2-0.9$ pc apart. The knots in the northern arm of the jet show only [Fe II] emission closer to the exciting source, a combination of [Fe II] and H${}_2$ at intermediate distances, and solely H${}_2$ emission farther outwards. Towards the southern arm, all the knots exhibit both H${}_2$ and [Fe II] emission. The nature of the shocks is inferred by assimilating the NIR observations with radio and X-ray observations from literature. In the northern arm, we infer the presence of strong dissociative shocks, in the knots located close to the exciting source. The knots in the southern arm that include HH80 and HH81 are explicable as a combination of strong and weak shocks. The mass-loss rates of the knots determined from [Fe II] luminosities are in the range $\sim 3.0\times 10^{-7}-5.2\times 10^{-5}$ M${}_{\odot }$ yr${}^{-1}$, consistent with those from massive protostars. Towards the central region, close to the driving source of the jet, we have observed various arcs in H${}_2$ emission which resemble bow shocks, and strings of H${}_2$ knots which reveal traces of multiple outflows.

20 pages, 5 figures, 3 tables, Accepted for publication in The Astrophysical Journal

References in corpus (18)

• The chemical make-up of the Sun: A 2020 vision
• Recipes for stellar jets: results of combined optical/infrared diagnostics
• Spitzer IRAC and MIPS Imaging of Clusters and Outflows in 9 High-mass Star Forming Regions
• Molecular jets from low-mass young protostellar objects
• Accretion and ejection properties of embedded protostars: the case of HH26, HH34 and HH46 IRS
• A census of molecular hydrogen outflows and their sources along the Orion A molecular ridge: characteristics and overall distribution
• X-rays from jet-driving protostars and T Tauri stars
• The Remarkable Mid-Infrared Jet of Massive Young Stellar Object G35.20-0.74
• A shallow though extensive H2 2.12 micron imaging survey of Taurus-Auriga-Perseus: I. NGC1333, L1455, L1448 and B1
• IR diagnostics of embedded jets: velocity resolved observations of the HH34 and HH1 jets
• POISSON project - III - Investigating the evolution of the mass accretion rate
• Origin of Misalignments: Protostellar Jet, Outflow, Circumstellar Disc, and Magnetic Field
• Modeling the accretion disk around the high-mass protostar GGD 27-MM1
• Detection of non-thermal emission from the massive protostellar jet HH80-81 at low radio frequencies using GMRT
• [Fe II] jets from intermediate-mass protostars in Carina
• Unveiling a cluster of protostellar disks around the massive protostar GGD27 MM1
• UKIRT Widefield Infrared Survey for Fe${}^{+}$
• Multi-epoch Sub-arcsecond [Fe II] Spectroimaging of the DG Tau Outflows with NIFS. II. On the Nature of the Bipolar Outflow Asymmetry

Cited by in corpus (2)

• Research on the Interstellar Medium and Star Formation in the Galaxy: An Indian Perspective
• Diverse stages of star formation in the IRAS 18162-2048 region. Emergence of UV Feedback