| Abstract: | A catalog of maser spectra in the 1.35-cm water-vapor line towards the maser source NGC 2071 in a region of massive star formation
is presented for 1994–2010. The observations were carried out using the 22-m antenna of the Pushchino Radio Astronomy Observatory
with a spectral resolution of 0.101 km/s (0.0822 km/s after the end of 2005). Based on the data throughout the monitoring
since 1980, two very different cycles of maser activity were found. The first (1980–1992) is characterized by high activity
within a broad range of radial velocities. Emission at velocities near 7 km/s predominated in 1980–1986, and emission near
14–16 km/s, in 1987–1992. In 1997–2008, the maser intensity was appreciably lower than in the first activity cycle. Numerous
flares of individual emission features were observed. Identifications based on VLA data show that strong flares took place
in both maser sources, IRS1 and IRS3. Both sources demonstrated a low level of maser activity during essentially the same
epochs (1977, 1995–1997, and the close of 2009 through the beginning of 2010), although the sources are separated by at least
2000 AU. |
