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HⅠVertical Structure of Nearby Edge-on Galaxies from CHANG-ES

Research in Astronomy and Astrophysics 2022年第8期22卷 49-62页

作者： Yun Zheng Jing Wang Judith Irwin QDaniel Wang Jiangtao Li Jayanne English Qingchuan Ma Ran Wang Ke Wang marita krause Toky H.Randriamampandry Rainer Beck Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China Department of Physics Engineering Physics&AstronomyQueen’s UniversityKingstonONK7L 3N6Canada Astronomy Department University of MassachusettsAmherstMA 01003USA Department of Astronomy University of MichiganAnn ArborMI48109-1107USA Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China Department of Physics and Astronomy University of ManitobaWinnipegManitobaR3T 2N2Canada Max-Planck-Institut für Radioastronomie Auf dem Hügel D-6953121 BonnGermany

We study the vertical distribution of the highly inclined galaxies from the Continuum Halos in Nearby Galaxies—an EVLA Survey(CHANG-ES).We explore the feasibility of photometrically deriving the HⅠdisk scale heights from the moment-0 images of the relatively edge-on galaxies with inclination>80°,by quantifying the systematic broadening effects and thus deriving correction equations for direct *** corrected HⅠdisk scale heights of the relatively edge-on galaxies from the CHANG-ES sample show trends consistent with the quasiequilibrium model of the vertical structure of gas *** procedure provides a convenient way to derive the scale heights and can easily be applied to statistical samples in the future.

关键词： galaxies:ISM galaxies:spiral galaxies:structure

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Low Temperature Growth of SWNTs on a Nickel Catalyst by Thermal Chemical Vapor Deposition

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Nano Research 2011年第4期4卷 334-342页

作者： Maoshuai He Alexander I. Chernov Elena D. Obraztsova Jani Sainio Emma Rikkinen Hua Jiang Zhen Zhu Antti Kaskela Albert G. Nasibulin Esko I. Kauppinen marita Niemela Outi krause Department of Biotechnology and Chemical Technology School of Science and Technology Aalto University P.O. Box 16100 F1-00076 Aalto Finland A.M. Prokhorov General Physics Institute RAS 38 Vavilov Street 119991 Moscow Russia Department of Applied Physics School of Science and Technology Aalto University P.O. Box 11100 FI-00076 Aalto Finland Nanomaterials Group Department of Applied Physics and Center for New Materials School of Science and Technology Aalto UniversityP.O. Box 15100 FI-00076 Aalto Finland VTT Biotechnology EO. Box 1000 FI-02044 Espoo Finland

Single-walled carbon nanotubes （SWNTs） have been grown on a silica-supported monometallic nickel （Ni） catalyst at temperatures ranging from as low as 450℃to 800℃. Different spectroscopic techniques, such as Raman, photoluminescence emission （PLE）, and ultra violet-visible-near infrared （UV-vis-NIR） absorption spectroscopy were used to evaluate file diameter and quality of the SWNTs grown over the Ni catalyst at different temperatures. The analysis revealed that high quality SWNTs with a very narrow diameter distribution were obtained at a growth temperature of 500 ℃. In the PLE and absorption spectra, differences were observed between the SWNTs grown oil Ni and those grown on cobalt （Co）. This result expands the potential of growing a specific （n, m） tube species with relatively high abundance by tuning the catalyst composition. Furthermore, the prerequisites for the low temperature growth of SWNTs over a monometallic transition metal catalyst have been elucidated.

关键词： Single-walled carbon nanotubes synthesis low temperature nickel catalyst

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