ALMA Observations of the IRDC Clump G34.43+00.24 MM3: 278 GHz Class I Methanol Masers

Abstract

We have observed a molecular clump (MM3) associated with the infrared dark cloud G34.43+00.24 in the CH3OH J_K=9_{-1}--8_0 E, 5_0-4_0 E, and 5_{-1}-4_{-1} E lines at sub-arcsecond resolution by using the Atacama Large Millimeter/submillimeter Array. By comparing the CH3OH J_K=9_{-1}-8_0 E emission with the CH3OH 5_0-4_0 E and 5_{-1}-4_{-1} E emission, we have found that the CH3OH J_K=9_{-1}-8_0 E emission is masing. We have clearly shown that the CH3OH J_K=9_{-1}-8_0 masers arise from the post shocked gas in the interacting regions between the outflows and ambient dense gas. Toward the strongest peak of the CH3OH maser emission, SiO J=6-5 emission is very weak. This indicates that the CH3OH maser emission traces relatively old shocks or weak shocks.

15 pages, 4 figures, accepted to ApJL

References in corpus (8)

• A Class I and Class II Methanol Maser Survey of Extended Green Objects (EGOs) from the GLIMPSE Survey
• Parametrization of C-shocks. Evolution of the Sputtering of Grains
• Class I methanol masers in the outflow of IRAS 16547-4247
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• Distributed Low-Mass Star Formation in the IRDC G34.43+00.24
• The First Very Long Baseline Interferometry Image of 44 GHz Methanol Maser with the KVN and VERA Array (KaVA)

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• The ALMA Survey of 70 $\mu$m dark High-mass clumps in Early Stages (ASHES). I. Pilot Survey: Clump Fragmentation
• Abundant Methanol Masers but no New Evidence for Star Formation in GCM0.253+0.016
• Online Database of Class I Methanol Masers
• Magnetic fields in the infrared dark cloud G34.43+0.24
• The ALMA Survey of 70 $\mu$m Dark High-mass Clumps in Early Stages (ASHES). IV. Star formation signatures in G023.477
• A multi-wavelength observation and investigation of six infrared dark clouds
• Similar complex kinematics within two massive, filamentary infrared dark clouds
• ALMA Observations of the IRDC Clump G34.43+00.24 MM3: DNC/HNC Ratio
• IRAS16547-4247: A New Candidate of a Protocluster Unveiled with ALMA
• Multiple outflows in the high-mass cluster forming region, G25.82-0.17
• First detection of the $J_{-1}\to (J-$ 1)${}_0-E$ methanol maser transitions at $J=7$ and $10$