The bubbling galactic disk.: II. The inner 20°

被引:186
作者
Churchwell, E.
Watson, D. F.
Povich, M. S.
Taylor, M. G.
Babler, B. L.
Meade, M. R.
Benjamin, R. A.
Indebetouw, R.
Whitney, B. A.
机构
[1] Univ Wisconsin Madison, Dept Astron, Madison, WI 53706 USA
[2] Univ Wisconsin Whitewater, Dept Phys, Whitewater, WI 53190 USA
[3] Univ Virginia, Dept Astron, Charlottesville, VA 22903 USA
[4] Space Sci Inst, Boulder, CO 80301 USA
关键词
HII regions; ISM : bubbles; stars : formation;
D O I
10.1086/521646
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report 269 mid-infrared bubbles within 10 degrees of the Galactic center from visual inspection of the Spitzer GLIMPSE II Legacy Science program images. The surface density of bubbles is similar to 5 deg(-2) or about 3 times that detected in longitudes broken vertical bar l vertical bar = 10 degrees -65 degrees, because the inner 10 degrees of longitude were more thoroughly searched for small bubbles. There is a gradient in the number of bubbles with longitude with an increase of about a factor of 2 from 2 degrees to 10 degrees; this is probably the result of several factors, including decreasing diffuse background brightness, confusion, and opacity with longitude. Bubble eccentricities are typically between 0.6 and 0.8, and > 50% show evidence for blowouts, which we suggest result from local density fluctuations of the ISMand/ or anisotropic stellar winds and radiation fields. The fraction of bubbles identified with H ii regions and clusters is only about half that found at broken vertical bar l vertical bar > 10 degrees. This is largely a result of the much smaller angular diameter of bubbles cataloged in the inner Galaxy than in the outer Galaxy. At least 12% of the bubbles have morphologies suggestive of triggered star formation. Most of the bubbles that show evidence for triggered star formation in the inner Galaxy have not formed secondary bubbles; it is postulated that this may be because they are too young to have had time for this to occur.
引用
收藏
页码:428 / 441
页数:14
相关论文
共 39 条
  • [31] Interpreting spectral energy distributions from young stellar objects. I. A grid of 200,000 YSO model SEDs
    Robitaille, Thomas P.
    Whitney, Barbara A.
    Indebetouw, Remy
    Wood, Kenneth
    Denzmore, Pia
    [J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2006, 167 (02) : 256 - 285
  • [32] Outflows from massive young stellar objects as seen with the infrared array camera
    Smith, Howard A.
    Hora, J. L.
    Marengo, M.
    Pipher, Judith L.
    [J]. ASTROPHYSICAL JOURNAL, 2006, 645 (02) : 1264 - 1271
  • [33] New Galactic Wolf-Rayet stars, and candidates (research note) -: An annex to the VIIth catalogue of Galactic Wolf-Rayet stars
    van der Hucht, K. A.
    [J]. ASTRONOMY & ASTROPHYSICS, 2006, 458 (02): : 453 - 459
  • [34] The VIIth catalogue of galactic Wolf-Rayet stars
    van der Hucht, KA
    [J]. NEW ASTRONOMY REVIEWS, 2001, 45 (03) : 135 - 232
  • [35] VANDERHUCHT KA, 2001, NEWA REV, V458, P135
  • [36] WATSON C, 2007, UNPUB APJ
  • [37] INTERSTELLAR BUBBLES .2. STRUCTURE AND EVOLUTION
    WEAVER, R
    MCCRAY, R
    CASTOR, J
    SHAPIRO, P
    MOORE, R
    [J]. ASTROPHYSICAL JOURNAL, 1977, 218 (02) : 377 - 395
  • [38] THE PREFERENTIAL FORMATION OF HIGH-MASS STARS IN SHOCKED INTERSTELLAR GAS LAYERS
    WHITWORTH, AP
    BHATTAL, AS
    CHAPMAN, SJ
    DISNEY, MJ
    TURNER, JA
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1994, 268 (01) : 291 - 298
  • [39] [No title captured]