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First detection of methyl formate in the hot molecular core IRAS 18566+0408

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Abstract

The studies of the complex molecular emission lines in the millimeter and submillimeter wavelengths towards the hot molecular cores reveal valuable details about the chemical complexity in the interstellar medium (ISM). We presented the first detection of the rotational emission lines of the complex organic molecule methyl formate (CH3OCHO) towards the hot molecular core region IRAS 18566+0408 using the high-resolution Atacama Large Millimeter/Submillimeter Array (ALMA) band 3 observation. The estimated column density of CH3OCHO using the rotational diagram analysis was (4.1±0.1)×1015 cm−2 with a rotational temperature of 102.8±1.2 K. The estimated fractional abundance of CH3OCHO relative to hydrogen (H2) towards the IRAS 18566+0408 was 3.90×10−9. We noted that the estimated fractional abundance of CH3OCHO is fairly consistent with the simulation value predicted by the three-phase warm-up model from Garrod (2013). We also discussed the possible formation mechanism of CH3OCHO towards the IRAS 18566+0408.

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Data Availability

The data that support the plots within this paper and other findings of this study are available from the corresponding author upon reasonable request. The raw ALMA data are publicly available at https://almascience.nao.ac.jp/asax/ (project id: 2015.1.00369.S).

Notes

  1. https://casa.nrao.edu/.

  2. http://cassis.irap.omp.eu/?page=cassis.

  3. https://cdms.astro.uni-koeln.de/cgi-bin/cdmssearch.

  4. https://spec.jpl.nasa.gov/.

  5. http://cassis.irap.omp.eu/docs/help_cassis_fit_intro.pdf.

  6. https://carta.readthedocs.io/en/latest/introduction.html.

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Acknowledgements

We thank the anonymous referee for the helpful comments that improved the manuscript. This paper makes use of the following ALMA data: ADS /JAO.ALMA#2015.1.00369.S (PI: Rosero, Viviana). ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in co-operation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ.

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No funds or grants were received during the preparation of this manuscript.

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Authors and Affiliations

  1. Midnapore City College, Kuturia, Bhadutala, Paschim Medinipur, West Bengal, 721129, India

    Arijit Manna & Sabyasachi Pal

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  1. Arijit Manna
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  2. Sabyasachi Pal
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Contributions

S.P. conceptualize the project. A.M. analyzed the ALMA data and identify the emission lines of methyl formate (CH3OCHO) from the HMC candidate IRAS 18566+0408. A.M analyses the rotational diagram to derive the column density and rotational temperature of CH3OCHO. A.M. and S.P. wrote the main manuscript text. All authors reviewed the manuscript.

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Correspondence to Arijit Manna.

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Manna, A., Pal, S. First detection of methyl formate in the hot molecular core IRAS 18566+0408. Astrophys Space Sci 367, 94 (2022). https://doi.org/10.1007/s10509-022-04132-8

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