SIMBAD references

2015ApJ...798L...1R - Astrophys. J., 798, L1 (2015/January-1)

Collisionally excited filaments in Hubble Space Telescope Hα and Hβ images of HH 1/2.

RAGA A.C., REIPURTH B., CASTELLANOS-RAMIREZ A., CHIANG H.-F. and BALLY J.

Abstract (from CDS):

We present new Hα and Hβ images of the HH 1/2 system, and we find that the Hα/Hβ ratio has high values in ridges along the leading edges of the HH 1 bow shock and of the brighter condensations of HH 2. These ridges have Hα/Hβ = 4 ⟶ 6, which is consistent with collisional excitation from the n = 1 to the n = 3 and 4 levels of hydrogen in a gas of temperatures T = 1.5 ⟶ 10x104 K. This is therefore the first direct evidence that the collisional excitation/ionization region of hydrogen just behind Herbig-Haro shock fronts is detected.

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Journal keyword(s): Herbig-Haro objects - ISM: individual: HH1/2 - ISM: jets and outflows - shock waves - stars: winds, outflows

Simbad objects: 6

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