The extremely sharp transition between molecular and ionized gas in the Horsehead nebula Article Swipe
Claudio Hernández-Vera
,
Viviana V. Guzmán
,
J. R. Goicoechea
,
Vincent Maillard
,
J. Pety
,
Franck Petit
,
Maryvonne Gérin
,
Émeric Bron
,
E. Roueff
,
Daniel Abergel
,
Thiébaut Schirmer
,
Joseph Carpenter
,
P. Gratier
,
Karl D. Gordon
,
K. A. Misselt
·
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.1051/0004-6361/202347206
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.1051/0004-6361/202347206
Massive stars can determine the evolution of molecular clouds by eroding and photo-evaporating their surfaces with strong ultraviolet (UV) radiation fields. Moreover, UV radiation is relevant in setting the thermal gas pressure in star-forming clouds, whose influence can extend across various spatial scales, from the rims of molecular clouds to entire star-forming galaxies. Probing the fundamental structure of nearby molecular clouds is therefore crucial to understand how massive stars shape their surrounding medium and how fast molecular clouds are destroyed, specifically at their UV-illuminated edges, where models predict an intermediate zone of neutral atomic gas between the molecular cloud and the surrounding ionized gas whose size is directly related to the exposed physical conditions. We present the highest angular resolution (~0.″5, corresponding to 207 au) and velocity-resolved images of the molecular gas emission in the Horsehead nebula, using CO J = 3–2 and HCO + J = 4−3 observations with the Atacama Large Millimeter/submillimeter Array (ALMA). We find that CO and HCO + are present at the edge of the cloud, very close to the ionization (H + /H) and dissociation fronts (H/H 2 ), suggesting a very thin layer of neutral atomic gas ( P th,H II suggesting the gas is slightly compressed. Therefore, dynamical effects cannot be completely ruled out and even higher angular observations will be needed to unveil their role.
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Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1051/0004-6361/202347206
- OA Status
- hybrid
- Cited By
- 10
- References
- 80
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4384823788
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4384823788Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1051/0004-6361/202347206Digital Object Identifier
- Title
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The extremely sharp transition between molecular and ionized gas in the Horsehead nebulaWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2023Year of publication
- Publication date
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2023-07-19Full publication date if available
- Authors
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Claudio Hernández-Vera, Viviana V. Guzmán, J. R. Goicoechea, Vincent Maillard, J. Pety, Franck Petit, Maryvonne Gérin, Émeric Bron, E. Roueff, Daniel Abergel, Thiébaut Schirmer, Joseph Carpenter, P. Gratier, Karl D. Gordon, K. A. MisseltList of authors in order
- Landing page
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https://doi.org/10.1051/0004-6361/202347206Publisher landing page
- Open access
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YesWhether a free full text is available
- OA status
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hybridOpen access status per OpenAlex
- OA URL
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https://doi.org/10.1051/0004-6361/202347206Direct OA link when available
- Concepts
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Physics, Astrophysics, Molecular cloud, Stars, Orion Nebula, Nebula, Milky Way, Galaxy, Millimeter, Star formation, Ionization, Interstellar medium, Submillimeter Array, Astronomy, Ion, Quantum mechanicsTop concepts (fields/topics) attached by OpenAlex
- Cited by
-
10Total citation count in OpenAlex
- Citations by year (recent)
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2025: 5, 2024: 5Per-year citation counts (last 5 years)
- References (count)
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80Number of works referenced by this work
- Related works (count)
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10Other works algorithmically related by OpenAlex
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