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A giant molecular c...
A giant molecular cloud catalogue in the molecular disc of the elliptical galaxy NGC 5128 (Centaurus A)
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- Miura, R.E. (author)
- National Astronomical Observatory of Japan
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- Espada, D. (author)
- Universidad de Granada,SKA Organisation
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- Hirota, A. (author)
- Atacama Large Millimeter-submillimeter Array (ALMA),National Astronomical Observatory of Japan
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- Henkel, C. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),King Abdulaziz University
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- Verley, S. (author)
- Universidad de Granada
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- Kobayashi, Masato I. N. (author)
- Tohoku University,Osaka University
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- Matsushita, Satoki (author)
- Academia Sinica Taiwan
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- Israel, F.P. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Vila-Vilaro, B. (author)
- European Southern Observatory Santiago,Atacama Large Millimeter-submillimeter Array (ALMA)
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- Morokuma-Matsui, K. (author)
- University of Tokyo, Japan
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- Ott, J. (author)
- National Radio Astronomy Observatory Socorro
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- Vlahakis, C. (author)
- National Radio Astronomy Observatory
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- Peck, A. (author)
- Gemini Observatory North
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- Aalto, Susanne, 1964 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Hogerheijde, M. (author)
- Universiteit Leiden (UL),Leiden University (UL),Universiteit Van Amsterdam,University of Amsterdam
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- Neumayer, N. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Iono, D. (author)
- The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan
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- Kohno, K. (author)
- University of Tokyo, Japan
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- Takemura, H. (author)
- National Astronomical Observatory of Japan,The Graduate University for Advanced Studies (SOKENDAI)
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- Komugi, S. (author)
- Kogakuin University of Technology and Engineering
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(creator_code:org_t)
- 2021-04-28
- 2021
- English.
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In: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 504:4, s. 6198-6215
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https://research.cha...
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https://doi.org/10.1...
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Abstract
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- We present the first census of giant molecular clouds (GMCs) complete down to 106 M⊙ and within the inner 4 kpc of the nearest giant elliptical and powerful radio galaxy, Centaurus A. We identified 689 GMCs using CO(1-0) data with 1 arcsec spatial resolution (∼20 pc) and 2 km s-1 velocity resolution obtained with the Atacama Large Millimeter/submillimeter Array. The I(CO)-N(H2) conversion factor based on the virial method is XCO = (2 ± 1) × 1020 cm-2(K km s-1)-1 for the entire molecular disc, consistent with that of the discs of spiral galaxies including the Milky Way, and XCO = (5 ± 2) × 1020 cm-2(K km s-1)-1 for the circumnuclear disc (CND; within a galactocentric radius of 200 pc). We obtained the GMC mass spectrum distribution and find that the best truncated power-law fit for the whole molecular disc, with index γ≃ -2.41 ± 0.02 and upper cut-off mass $\sim \! 1.3\times 10^{7}\, \mathrm{M}_{\odot }$, is also in agreement with that of nearby disc galaxies. A trend is found in the mass spectrum index from steep to shallow as we move to inner radii. Although the GMCs are in an elliptical galaxy, the general GMC properties in the molecular disc are as in spiral galaxies. However, in the CND, large offsets in the line-width-size scaling relations (∼0.3 dex higher than those in the GMCs in the molecular disc), a different XCO factor, and the shallowest GMC mass distribution shape (γ= -1.1 ± 0.2) all suggest that there the GMCs are most strongly affected by the presence of the active galactic nucleus and/or shear motions.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Galaxies: ISM
- Galaxies: elliptical and lenticular, cD
- Galaxies: individual (NGC 5128)
- ISM: clouds
- ISM: molecules
Publication and Content Type
- art (subject category)
- ref (subject category)
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To the university's database
- By the author/editor
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Miura, R.E.
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Espada, D.
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Hirota, A.
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Henkel, C.
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Verley, S.
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Kobayashi, Masat ...
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show more...
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Matsushita, Sato ...
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Israel, F.P.
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Vila-Vilaro, B.
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Morokuma-Matsui, ...
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Ott, J.
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Vlahakis, C.
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Peck, A.
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Aalto, Susanne, ...
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Hogerheijde, M.
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Neumayer, N.
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Iono, D.
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Kohno, K.
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Takemura, H.
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Komugi, S.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Subatomic Physic ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Meteorology and ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
- Articles in the publication
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Monthly Notices ...
- By the university
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Chalmers University of Technology