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Formaldehyde and H110α observations towards 6.7 GHz methanol maser sources

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Abstract

Intriguing work on observations of 4.83 GHz formaldehyde (H2CO) absorptions and 4.87 GHz H110α radio recombination lines (RRLs) towards 6.7 GHz methanol (CH3OH) maser sources is presented. Methanol masers provide ideal sites to probe the earliest stages of massive star formation, while 4.8 GHz formaldehyde absorptions are accurate probes of physical conditions in dense (103–105 cm−3) and low temperature molecular clouds towards massive star forming regions. The work is aimed at studying feature similarities between the formaldehyde absorptions and the methanol masers so as to expand knowledge of events and physical conditions in massive star forming regions. A total of 176 methanol maser sources were observed for formaldehyde absorptions, and formaldehyde absorptions were detected 138 of them. 53 of the formaldehyde absorptions were newly detected. We noted a poor correlation between the methanol and formaldehyde intensities, an indication that the signals (though arise from about the same regions) are enhanced by different mechanisms. Our results show higher detection rates of the formaldehyde lines for sources with stronger methanol signals. The strongest formaldehyde absorptions were associated with IRAS sources and IRDCs that have developed HII regions, and that do not have EGOs.

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Acknowledgements

We are immensely grateful to TWAS (the Academy of Science for the Developing World) and CAS (the Chinese Academy of Science) for their generous travel and financial supports during the periods of this research work. The work was also funded by the National Natural Science foundation of China under grant 10778703, and partly supported by the China Ministry of Science and Technology under State Key Development Program for Basic Research (2012CB821800) and The National Natural Science foundation of China under grant 11373062, 11303081 and 10873025.

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Authors and Affiliations

  1. Xinjiang Astronomical Observatory, CAS, Urumqi, 830011, China

    Daniel Okoh, Jarken Esimbek, Jian Jun Zhou & Xin Di Tang

  2. Center for Basic Space Science, University of Nigeria, Nsukka, 410001, Nigeria

    Daniel Okoh & Pius Okeke

  3. Physics & Astronomy Department, University of Nigeria, Nsukka, 410001, Nigeria

    Daniel Okoh, Augustine Chukwude & Johnson Urama

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  1. Daniel Okoh
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Okoh, D., Esimbek, J., Zhou, J.J. et al. Formaldehyde and H110α observations towards 6.7 GHz methanol maser sources. Astrophys Space Sci 350, 657–681 (2014). https://doi.org/10.1007/s10509-014-1779-0

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