Thermal formaldehyde emission in NGC 7538 IRS 1 Article Swipe
Onic I. Shuvo
,
E. D. Araya
,
W. S. Tan
,
P. Höfner
,
S. Kurtz
,
Y. M. Pihlström
,
Ian M. Hoffman
·
YOU?
·
· 2021
· Open Access
·
· DOI: https://doi.org/10.1093/mnras/stab933
YOU?
·
· 2021
· Open Access
·
· DOI: https://doi.org/10.1093/mnras/stab933
Spectral lines from formaldehyde (H2CO) molecules at cm wavelengths are typically detected in absorption and trace a broad range of environments, from diffuse gas to giant molecular clouds. In contrast, thermal emission of formaldehyde lines at cm wavelengths is rare. In previous observations with the 100 m Robert C. Byrd Green Bank Telescope (GBT), we detected 2 cm formaldehyde emission towards NGC 7538 IRS1 – a high-mass protostellar object in a prominent star-forming region of our Galaxy. We present further GBT observations of the 2 and 1 cm H2CO lines to investigate the nature of the 2 cm H2CO emission. We conducted observations to constrain the angular size of the 2 cm emission region based on a East–West and North–South cross-scan map. Gaussian fits of the spatial distribution in the East–West direction show a deconvolved size (at half maximum) of the 2 cm emission of 50 arcsec ± 8 arcsec. The 1 cm H2CO observations revealed emission superimposed on a weak absorption feature. A non-LTE radiative transfer analysis shows that the H2CO emission is consistent with quasi-thermal radiation from dense gas (${\sim}10^5$–$10^6$ cm−3). We also report detection of four transitions of CH3OH (12.2, 26.8, 28.3, 28.9 GHz), the (8,8) transition of NH3 (26.5 GHz), and a cross-scan map of the 13 GHz SO line that shows extended emission (>50 arcsec).
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Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1093/mnras/stab933
- OA Status
- green
- Cited By
- 3
- References
- 51
- Related Works
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- OpenAlex ID
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All OpenAlex metadata
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https://openalex.org/W3144576366Canonical identifier for this work in OpenAlex
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https://doi.org/10.1093/mnras/stab933Digital Object Identifier
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Thermal formaldehyde emission in NGC 7538 IRS 1Work title
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articleOpenAlex work type
- Language
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enPrimary language
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2021Year of publication
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2021-04-01Full publication date if available
- Authors
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Onic I. Shuvo, E. D. Araya, W. S. Tan, P. Höfner, S. Kurtz, Y. M. Pihlström, Ian M. HoffmanList of authors in order
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https://doi.org/10.1093/mnras/stab933Publisher landing page
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YesWhether a free full text is available
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greenOpen access status per OpenAlex
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https://arxiv.org/pdf/2103.14492Direct OA link when available
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Physics, Astrophysics, Galaxy, Formaldehyde, Green Bank Telescope, Emission spectrum, Radiative transfer, Spectral line, Line (geometry), Star formation, Absorption (acoustics), Wavelength, Molecular cloud, Astronomy, Stars, Chemistry, Optics, Organic chemistry, Mathematics, GeometryTop concepts (fields/topics) attached by OpenAlex
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3Total citation count in OpenAlex
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2025: 1, 2024: 1, 2022: 1Per-year citation counts (last 5 years)
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10Other works algorithmically related by OpenAlex
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