HIGH ANGULAR RESOLUTION MULTI-LINE STUDY OF HH 1 AND 2

Journal Article · Thu Oct 15 04:00:00 EDT 2015 · Astronomical Journal (Online)

DOI:https://doi.org/10.1088/0004-6256/150/4/105· OSTI ID:22520138

Raga, A. C.; Castellanos-Ramírez, A. ^[1]; Reipurth, Bo; Chiang, Hsin-Fang ^[2]

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1. Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Ap. 70-543, 04510 D.F., México (Mexico)
2. Institute for Astronomy, University of Hawaii at Manoa, Hilo, HI 96720 (United States)

We present new Hubble Space Telescope (HST) narrow band images of the bright Herbig–Haro (HH) objects HH 1 and 2 in the light of the Hα, Hβ, [O i] 6300, [O ii] 3726+28, [O iii] 5007 and [S ii] 6716+30 emission lines. The resulting emission and line ratio maps give an improved picture of the physical structure of these HH objects, showing the presence of spatially limited, high excitation/ionization ridges. We find that HH 1 has a morphology that could be interpreted in terms of a single, asymmetric bow shock, and that many of the clumps of HH 2 fall in two bow-shaped structures of different excitations. We also construct two-line ratio plots showing clear trends, which are much simpler than the highly complex spatial distributions of the emission, and are therefore interesting for testing shock models of HH objects (we only present a comparison with previously published, steady plane-parallel shock models). We have also used the temperature-sensitive [O i]/[S ii] line ratio to evaluate the temperature range and to obtain temperature maps of HH 1 and 2. We find that this line ratio picks out emitting regions with temperatures ≈10{sup 4} K, except along the leading edges of the HH 1 and 2 bow shocks (in which temperatures of ∼3 → 5 × 10{sup 4} K are obtained)

• OSTI ID: 22520138
• Journal Information: Astronomical Journal (Online), Journal Name: Astronomical Journal (Online) Journal Issue: 4 Vol. 150; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COMPARATIVE EVALUATIONS
EMISSION
EMISSION SPECTRA
EMISSION SPECTROSCOPY
EXCITATION
HERBIG-HARO OBJECTS
IONIZATION
OXYGEN
RESOLUTION
SHOCK WAVES
SILICON
SPACE
SPATIAL DISTRIBUTION
STARS
SULFUR
TELESCOPES
VISIBLE RADIATION