The volume densities of giant molecular clouds in M83

被引：13
|
作者：
Heiner, J. S. [1 ,2 ]
Allen, R. J. [2 ]
Wong, O. I. [3 ]
van der Kruit, P. C. [1 ]
机构：
[1] Univ Groningen, Kapteyn Astron Inst, NL-9700 AV Groningen, Netherlands
[2] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[3] Yale Univ, Dept Astron, New Haven, CT 06520 USA
来源：
ASTRONOMY & ASTROPHYSICS | 2008年 / 489卷 / 02期
关键词：
galaxies : individual : M83; galaxies : ISM; ISM : clouds; ISM : molecules; ultraviolet : galaxies; radio lines : galaxies;
D O I：
10.1051/0004-6361:200810430
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Using observed GALEX far-ultraviolet (FUV) fluxes and VLA images of the 21-cm HI column densities, along with estimates of the local dust abundances, we measure the volume densities of a sample of actively star-forming giant molecular clouds (GMCs) in the nearby spiral galaxy M83 on a typical resolution scale of 170 pc. Our approach is based on an equilibrium model for the cycle of molecular hydrogen formation on dust grains and photodissociation under the influence of the FUV radiation on the cloud surfaces of GMCs. We find a range of total volume densities on the surface of GMCs in M83, namely 0.1-400 cm(-3) inside R(25), 0.5-50 cm(-3) outside R(25). Our data include a number of GMCs in the HI ring surrounding this galaxy. Finally, we discuss the effects of observational selection, which may bias our results.
引用
收藏
页码：533 / U28
页数：22
相关论文
共 50 条
  • [1] The volume densities of giant molecular clouds in M81
    Heiner, Jonathan S.
    Allen, Ronald J.
    Emonts, Bjorn H. C.
    van der Kruit, Pieter C.
    ASTROPHYSICAL JOURNAL, 2008, 673 (02) : 798 - 809
  • [2] The varying mass distribution of molecular clouds across M83
    Freeman, Pamela
    Rosolowsky, Erik
    Kruijssen, J. M. Diederik
    Bastian, Nate
    Adamo, Angela
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2017, 468 (02) : 1769 - 1781
  • [3] Search for molecular gas in XUV disk of M83
    Morokuma-Matsui, Kana
    Koda, Jin
    Takekoshi, Tatsuya
    Saito, Masao
    Nakanishi, Hiroyuki
    Boissier, Samuel
    Madore, Barry F.
    Boselli, Alessandro
    Gil de Paz, Armando
    Thilker, David
    Yagi, Masafumi
    Sorai, Kazuo
    Kuno, Nario
    FORMATION AND EVOLUTION OF GALAXY OUTSKIRTS, 2016, 11 (S321): : 268 - 268
  • [4] Hidden trigger for the giant starburst arc in M83?
    Diaz, Ruben J.
    Dottori, Horacio
    Aguero, Maria P.
    Mediavilla, Evencio
    Rodrigues, Irapuan
    Mast, Damian
    ASTROPHYSICAL JOURNAL, 2006, 652 (02) : 1122 - 1128
  • [5] Compact and high excitation molecular clumps in the extended ultraviolet disk of M83
    Koda, Jin
    Combes, Francoise
    Rubio, Monica
    Andersen, Morten
    Bigiel, Frank
    de Paz, Armando Gil
    Junais, Amanda M.
    Lee, Amanda M.
    Meyer, Jennifer Donovan
    Morokuma-Matsui, Kana
    Yagi, Masafumi
    Zavagno, Annie
    ASTRONOMY & ASTROPHYSICS, 2024, 691
  • [6] ALMA 12CO (J=1-0) imaging of the nearby galaxy M83: Variations in the efficiency of star formation in giant molecular clouds
    Hirota, Akihiko
    Egusa, Fumi
    Baba, Junichi
    Kuno, Nario
    Muraoka, Kazuyuki
    Tosaki, Tomoka
    Miura, Rie
    Nakanishi, Hiroyuki
    Kawabe, Ryohei
    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2018, 70 (04)
  • [7] Molecular gas around the double nucleus in M83
    Sakamoto, K
    Matsushita, S
    Peck, AB
    Wiedner, MC
    Iono, D
    ASTROPHYSICAL JOURNAL, 2004, 616 (01) : L59 - L62
  • [8] Molecular Gas Properties in M83 from CO PDFs
    Egusa, Fumi
    Hirota, Akihiko
    Baba, Junichi
    Muraoka, Kazuyuki
    ASTROPHYSICAL JOURNAL, 2018, 854 (02)
  • [9] Giant molecular clouds in M64
    Rosolowsky, E
    Blitz, L
    ASTROPHYSICAL JOURNAL, 2005, 623 (02) : 826 - 845
  • [10] ANGULAR MOMENTUM IN GIANT MOLECULAR CLOUDS. II. M33
    Imara, Nia
    Bigiel, Frank
    Blitz, Leo
    ASTROPHYSICAL JOURNAL, 2011, 732 (02)
12345