Search Publications

Is HH 47 Slowing Down?

Velázquez, P. F.; Raga, A. C.; Noriega-Crespo, A.

We have used three epochs of red [S II] and Hα Hubble Space Telescope (HST) archival images of HH 47 to determine the proper motion velocities of the knots along the jet. With the three available epochs we compute two sets of proper motions (one using the first two epochs, and the second one using the last two epochs). Somewhat surprisingly, we fi…

The Time-Dependent Wavelet Spectrum of HH 1 and 2

Raga, A. C.; Esquivel, A.; Riera, A. +2 more

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) wit…