The time-dependent wavelet spectrum of HH 1 and 2
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 char...
| Autores: | , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2018 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Redalyc-UNAM |
| OAI Identifier: | oai:redalyc.org:57171626014 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=57171626014 https://www.redalyc.org/journal/571/57171626014/ https://www.redalyc.org/journal/571/57171626014/html/ https://www.redalyc.org/journal/571/57171626014/57171626014.epub https://www.redalyc.org/journal/571/57171626014/movil |
| Access Level: | acceso abierto |
| Palabra clave: | Física, Astronomía y Matemáticas 2) Herbig outflows shock waves Haro objects |
| Sumario: | 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. |
|---|