English  |  正體中文  |  简体中文  |  Items with full text/Total items : 49258/83761 (59%)
Visitors : 7140011      Online Users : 96
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/72734


    Title: Dense gas in nearby galaxies : XI. Interstellar 12C/13C ratios in the central regions of M 82 and IC 342
    Authors: Chin, Y.N.;Henkel, C.;Mauersberger, R.;Whiteoak, J.B.
    Contributors: 淡江大學物理學系
    Keywords: : ISM: abundances – Galaxies: abundances – Radio lines: ISM – Radio lines: galaxies
    Date: 1998-01
    Issue Date: 2013-05-31 11:31:16 (UTC+8)
    Publisher: Les Ulis: EDP Sciences
    Abstract: (12) C / (13) C line intensity ratios have been derived from several carbon-bearing molecules to confine the range of carbon and oxygen isotope abundance ratios toward the nuclear regions of two infrared bright galaxies. The most stringent limits are obtained from CN mm-wave emission lines. Supplementary measurements toward the Galactic center region indicate that overall I(twCN)/I(thCN) line intensity ratios are giving lower limits to the corresponding ISOC abundance ratio. Toward M82 and IC342, we find ISOC > 40 and > 30. Therefore the smaller ISOC ratio of our own Galactic center region (25) may not be typical for central regions of galaxies which are more luminous in the infrared. The ISOC limits and data from various isotopic species of CO also infer ISOA abundance ratios of > 90 and > 125 for M82 and IC342, respectively. From the I(HCfoN) / I(HCfiN) line intensity ratio, ISON > 100 is derived for M82. Based on observations with the IRAM 30-m telescope, Pico Veleta, Spain and the Swedish-ESO Submillimetre Telescope (SEST) at the European Southern Observatory (ESO), La Silla, Chile
    Relation: Astronomy and Astrophysics 329, pp.443-450
    Appears in Collections:[物理學系暨研究所] 期刊論文

    Files in This Item:

    File Description SizeFormat
    9710254.pdf465KbAdobe PDF137View/Open

    All items in 機構典藏 are protected by copyright, with all rights reserved.


    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - Feedback