HIERARCHICAL STAR FORMATION IN NEARBY LEGUS GALAXIES

被引：43

作者：

Elmegreen, Debra Meloy ^{[1
]}

Elmegreen, Bruce G. ^{[2
]}

Adamo, Angela ^{[3
,4
]}

Aloisi, Alessandra ^{[5
]}

Andrews, Jennifer ^{[6
]}

Annibali, Francesca ^{[7
]}

Bright, Stacey N. ^{[5
]}

Calzetti, Daniela

Cignoni, Michele ^{[5
]}

Evans, Aaron S. ^{[8
,9
]}

Gallagher, John S., III ^{[10
]}

Gouliermis, Dimitrios A. ^{[3
,11
]}

Grebel, Eva K. ^{[12
]}

Hunter, Deidre A. ^{[13
]}

Johnson, Kelsey ^{[8
]}

Kim, Hwihyun ^{[14
]}

Lee, Janice ^{[5
]}

Sabbi, Elena ^{[5
]}

Smith, Linda J. ^{[15
,16
]}

Thilker, David ^{[17
]}

Tosi, Monica ^{[7
]}

Ubeda, Leonardo ^{[5
]}

机构：

[1] Vassar Coll, Dept Phys & Astron, Poughkeepsie, NY 12604 USA

[2] TJ Watson Res Ctr, IBM Res Div, Yorktown Hts, NY 10598 USA

[3] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[4] Stockholm Univ, AlbaNova Univ Ctr, Oskar Klein Ctr, Dept Astron, SE-10691 Stockholm, Sweden

[5] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[6] Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA

[7] Osservatorio Astron Bologna, INAF, I-40127 Bologna, Italy

[8] Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA

[9] Natl Radio Astron Observ, Charlottesville, VA 22903 USA

[10] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA

[11] Heidelberg Univ, Zentrum Astron, Inst Theoret Astrophys, D-69120 Heidelberg, Germany

[12] Heidelberg Univ, Zentrum Astron, Astronom Rechen Inst, D-69120 Heidelberg, Germany

[13] Lowell Observ, Flagstaff, AZ 86001 USA

[14] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA

[15] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[16] European Space Agcy, Baltimore, MD 21218 USA

[17] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2014年 / 787卷 / 01期

关键词：

galaxies: ISM; galaxies: star clusters: general; ISM: structure; stars: formation; SPATIAL-DISTRIBUTION; GLOBULAR-CLUSTERS; MASS FUNCTION; NGC; 5253; STELLAR; METALLICITY; BINARY; ORIGIN; GAS; POPULATIONS;

D O I：

10.1088/2041-8205/787/1/L15

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Hierarchical structure in ultraviolet images of 12 late-type LEGUS galaxies is studied by determining the numbers and fluxes of nested regions as a function of size from similar to 1 to similar to 200 pc, and the number as a function of flux. Two starburst dwarfs, NGC 1705 and NGC 5253, have steeper number-size and flux-size distributions than the others, indicating high fractions of the projected areas filled with star formation. Nine subregions in seven galaxies have similarly steep number-size slopes, even when the whole galaxies have shallower slopes. The results suggest that hierarchically structured star-forming regions several hundred parsecs or larger represent common unit structures. Small galaxies dominated by only a few of these units tend to be starbursts. The self-similarity of young stellar structures down to parsec scales suggests that star clusters form in the densest parts of a turbulent medium that also forms loose stellar groupings on larger scales. The presence of super star clusters in two of our starburst dwarfs would follow from the observed structure if cloud and stellar subregions more readily coalesce when self-gravity in the unit cell contributes more to the total gravitational potential.

引用

页数：7

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