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  • Izumi, T.University of Tokyo, Japan (author)

ALMA OBSERVATIONS OF THE SUBMILLIMETER DENSE MOLECULAR GAS TRACERS IN THE LUMINOUS TYPE-1 ACTIVE NUCLEUS OF NGC 7469

  • Article/chapterEnglish2015

Publisher, publication year, extent ...

  • 2015-09-16
  • American Astronomical Society,2015
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:50205ade-b8aa-48f7-b016-5456a86bc787
  • https://research.chalmers.se/publication/227470URI
  • https://doi.org/10.1088/0004-637x/811/1/39DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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Classification

  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • We present Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 1 observations of the central kiloparsec region of the luminous type. 1 Seyfert galaxy NGC 7469 with unprecedented high resolution (0.'' 5x0.'' 4 = 165 x 132 pc) at submillimeter wavelengths. Utilizing the wide. bandwidth of ALMA, we simultaneously obtained HCN(4-3), HCO+(4-3), CS(7-6), and partially CO(3-2) line maps, as well as the 860 mu m continuum. The region consists of the central similar to 1 '' component and the surrounding starburst ring with a radius of similar to 1.'' 5-2.'' 5. Several structures connect these components. Except for CO(3-2), these dense gas tracers are significantly concentrated toward the central similar to 1 '', suggesting their suitability to probe the nuclear regions of galaxies. Their spatial distribution resembles well those of centimeter and mid-infrared continuum emissions, but it is anticorrelated with the optical one, indicating the existence of dust-obscured star formation. The integrated intensity ratios of HCN(4-3)/HCO+(4-3) and HCN(4-3)/CS(7-6) are higher at the active galactic nucleus (AGN) position than at the starburst ring, which is consistent with our previous findings (submillimeter-HCN enhancement). However, the HCN(4-3)/HCO+(4-3) ratio at the AGN position of NGC 7469 (1.11 +/- 0.06) is almost half of the corresponding value of the low-luminosity type. 1 Seyfert galaxy NGC 1097 (2.0 +/- 0.2), despite the more than two orders of magnitude higher X-ray luminosity of NGC 7469. But the ratio is comparable to that of the close vicinity of the AGN of NGC 1068 (similar to 1.5). Based on these results, we speculate that some heating mechanisms other than X-ray (e.g., mechanical heating due to an AGN jet) can contribute significantly for shaping the chemical composition in NGC 1097.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Kohno, K.University of Tokyo, Japan (author)
  • Aalto, Susanne,1964Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)saalto (author)
  • Doi, A. (author)
  • Espada, D.The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan,Atacama Large Millimeter-submillimeter Array (ALMA) (author)
  • Fathi, K. (author)
  • Harada, N.Academia Sinica Taiwan (author)
  • Hatsukade, B.National Astronomical Observatory of Japan (author)
  • Hattori, T.National Astronomical Observatory of Japan (author)
  • Hsieh, P. Y.Academia Sinica Taiwan,National Central University (author)
  • Ikarashi, S.University of Tokyo, Japan,European Southern Observatory (ESO) (author)
  • Imanishi, M.National Astronomical Observatory of Japan,The Graduate University for Advanced Studies (SOKENDAI) (author)
  • Iono, D.The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan (author)
  • Ishizuki, S.National Astronomical Observatory of Japan (author)
  • Krips, M.Institut de Radioastronomie Millimétrique (IRAM) (author)
  • Martin, S.Institut de Radioastronomie Millimétrique (IRAM) (author)
  • Matsushita, S.Academia Sinica Taiwan (author)
  • Meier, D. S.New Mexico Institute of Mining and Technology (author)
  • Nagai, H.National Astronomical Observatory of Japan (author)
  • Nakai, N.University of Tsukuba (author)
  • Nakajima, T.Nagoya University (author)
  • Nakanishi, K.National Astronomical Observatory of Japan,Atacama Large Millimeter-submillimeter Array (ALMA),The Graduate University for Advanced Studies (SOKENDAI) (author)
  • Nomura, H.Tokyo Institute of Technology (author)
  • Regan, M. W.Space Telescope Science Institute (STScI) (author)
  • Schinnerer, E.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Sheth, K.National Radio Astronomy Observatory (author)
  • Takano, S.Nihon University (author)
  • Tamura, Y.University of Tokyo, Japan (author)
  • Terashima, Y.Ehime University (author)
  • Tosaki, T.Joetsu University of Education (author)
  • Turner, J. L.University of California (author)
  • Umehata, H.University of Tokyo, Japan (author)
  • Wiklind, Tommy,1957Atacama Large Millimeter-submillimeter Array (ALMA)(Swepub:cth)wiklind (author)
  • University of Tokyo, JapanChalmers tekniska högskola (creator_code:org_t)

Related titles

  • In:Astrophysical Journal: American Astronomical Society811:1, s. Article Number: 39-1538-43570004-637X

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