The Time-Dependent Wavelet Spectrum of HH 1 and 2
Abstract
We have calculated the wavelet spectra of four epochs (spanning ≈20 yr) of Hα and [S II] HST images of HH 1 and 2. From these spectra we calculated the distribution functions of the (angular) radii of the emission structures. We found that the size distributions have maxima (corresponding to the characteristic sizes of the observed structures) with radii that are logarithmically spaced with factors of ≈2→3 between the successive peaks. The positions of these peaks generally showed small shifts towards larger sizes as a function of time. This result indicates that the structures of HH 1 and 2 have a general expansion (seen at all scales), and/or are the result of a sequence of merging events resulting in the formation of knots with larger characteristic sizes.
- Publication:
-
Revista Mexicana de Astronomia y Astrofisica
- Pub Date:
- April 2018
- Bibcode:
- 2018RMxAA..54..195R
- Keywords:
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- Herbig-Haro objects;
- ISM: individual objects (HH1/2);
- ISM: jets and outflows;
- ISM: kinematics and dynamics;
- shock waves;
- stars: winds;
- outflows