Orientation effect on the ligh curve shape of periodic methanol maser sources

TL;DR

This study investigates how the orientation of star-forming regions influences the light curve shapes of periodic methanol masers through millimeter observations and gas kinematics analysis.

Contribution

It provides observational evidence linking maser light curve profiles to the orientation of bipolar outflows in star-forming regions.

Findings

Edge-on sources show bipolar outflows aligned NW-SE.

Face-on sources exhibit co-located blue and red outflows.

Orientation affects the observed light curve characteristics.

Abstract

We report the results of our pilot millimeter observations of periodic maser sources. Using SMA, we carried out 1.3\,mm observations of G22.357$+$0.066 and G25.411$+$0.105, while ALMA 1.3 mm archival data was used in the case of G9.62+0.19E. Two continuum cores (MM1 and MM2) were detected in G22.357$+$0.066, while 3 cores (MM1 -- MM3) detected in G25.411$+$0.105. Assuming dust-to-gas ratio of 100, we derived the masses of the detected cores. Using the $^{12}$CO (2-1) and $^{13}$CO (2-1) line emission, we observed gas kinematics tracing the presence of bipolar outflows in all three star-forming regions. In the cases of G22.357$+$0.066 and G9.62+0.19E, both with similar periodic maser light curve profiles, the outflowing gas is seen in the north-west south-east direction. This suggest edge-on view of the 2 sources. G25.411$+$0.105, with a contrasting light curve profile, show a spatially co-located blue and red outflow lobes, suggesting a face-on view. Our results suggest that orientation effects may play a role in determining the characteristics of the light curves of periodic methanol masers.