Kavli Affiliate: Gregory Herczeg
| First 5 Authors: Zhiwei Chen, Doug Johnstone, Carlos Contreras Peña, Jeong-Eun Lee, Sheng-Yuan Liu
| Summary:
We conducted a comprehensive analysis of young stellar object (YSO)
variability at submillimeter and mid-infrared (mid-IR) wavelengths for the
M,17 ion{H}{2} region, using 3.5 years monitoring data from the JCMT
Transient Survey at $450$ and $850,mu$m and 9 years mid-IR monitoring data
from the NEOWISE mission. Our study encompasses observations of 198 and 164
bright submillimeter peaks identified within the deep JCMT coadded maps at 450
and $850,mu$m, and 66 YSOs seen by NEOWISE W2 that were previously identified
in mid-IR observations. We find one robust linear submillimeter variable, an
intermediate mass protostar, with a $4%$ peak flux change in 3.5 years of JCMT
monitoring that sets a lower limit of $16%$ luminosity increase for the
source. At mid-IR wavelengths, our analysis reveals secular and stochastic
variability in 22 YSOs, with the highest fraction of secular variability
occurring at the earliest evolutionary stage. This mid-IR fractional
variability as a function of evolutionary stage result is similar to what has
previously been found for YSO variability within the Gould Belt and the
intermediate-mass star formation region M17,SWex, though overall less
variability is detected in M,17 in submillimeter and mid-IR. We suspect that
this lower detection of YSO variability is due to both the greater distance to
M,17 and the strong feedback from the ion{H}{2} region. Our findings showcase
the utility of multiwavelength observations to better capture the complex
variability phenomena inherent to star formation processes and demonstrate the
importance of years-long monitoring of a diverse selection of star-forming
environments.
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