2017/10/25 by L. F. Rodríguez, L. F. Rodriguez, A. C. Raga +8
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Geophysics and Gravity Measurements #Solar and Space Plasma Dynamics #Solar and Stellar Astrophysics (astro-ph.SR) #astro-ph.GA #astro-ph.SR
paper · pdf · doi:10.48550/arxiv.1710.09348
To appear in Revista Mexicana de Astronomia y Astrofisica,7 pages, 8 figures
arxiv created 2017/10/25 · openalex publication_date 2017/10/25 · arxiv updated 2017/10/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 (about a factor of 2). We also find that the F\rm Hα/Fff (Hα to free-free 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).