A Comparison of the Radio and Optical Time-Evolution of HH 1 and 2
Abstract
We present a comparison between the time-evolution over the past ≈20 years of the radio continuum and Hα emission of HH 1 and 2. We find that the radio continuum and the Hα emission of both objects show very similar trends, with HH 1 becoming fainter and HH 2 brightening quite considerably (by about a factor of 2). We also find that the FHα /Fff (Hα to freefree continuum) ratio of HH 1 and 2 has higher values than the ones typically found in planetary nebulae (PNe), which we interpret as an indication that the Hα and free-free emission of HH 1/2 is produced in emitting regions with lower temperatures (≈2000 K) than the emission of PNe (with ≈104 K).
- Publication:
-
Revista Mexicana de Astronomia y Astrofisica
- Pub Date:
- April 2018
- DOI:
- 10.48550/arXiv.1710.09348
- arXiv:
- arXiv:1710.09348
- Bibcode:
- 2018RMxAA..54...57R
- Keywords:
-
- Herbig-Haro objects;
- ISM: individual objects: HH1/2;
- ISM: jets and outflows;
- ISM: kinematics and dynamics;
- shock waves;
- stars: winds;
- outflows;
- Astrophysics - Solar and Stellar Astrophysics;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- To appear in Revista Mexicana de Astronomia y Astrofisica,7 pages, 8 figures