Star-forming Clumps in Local Luminous Infrared Galaxies

被引：29

作者：

Larson, K. L. ^{[1
,2
]}

Diaz-Santos, T. ^{[3
]}

Armus, L. ^{[2
]}

Privon, G. C. ^{[4
]}

Linden, S. T. ^{[5
]}

Evans, A. S. ^{[5
,6
]}

Howell, J. ^{[2
]}

Charmandaris, V. ^{[7
,8
]}

V, U. ^{[9
]}

Sanders, D. B. ^{[10
]}

Stierwalt, S. ^{[2
,11
]}

Barcos-Munoz, L. ^{[6
,12
]}

Rich, J. ^{[13
]}

Medling, A. ^{[1
,14
]}

Cook, D. ^{[2
]}

Oklopcic, A. ^{[1
,15
]}

Murphy, E. J. ^{[6
]}

Bonfini, P. ^{[8
,16
]}

机构：

[1] CALTECH, Dept Astron, 1200 E Calif Blvd, Pasadena, CA 91125 USA

[2] CALTECH, IPAC, 1200 E Calif Blvd, Pasadena, CA 91125 USA

[3] Univ Diego Portales, Nucleo Astron, Fac Ingn, Ave Ejercito Libertador 441, Santiago, Chile

[4] Univ Florida, Dept Astron, 211 Bryant Space Sci Ctr, Gainesville, FL 32611 USA

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

[6] Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA

[7] Univ Crete, Dept Phys, GR-71003 Iraklion, Greece

[8] Fdn Res & Technol Hellas, Inst Astrophys, GR-70013 Iraklion, Greece

[9] Univ Calif Irvine, Dept Phys & Astron, 4129 Frederick Reines Hall, Irvine, CA 92697 USA

[10] Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA

[11] Occidental Coll, Dept Phys, 1600 Campus Rd, Los Angeles, CA 90041 USA

[12] Joint ALMA Observ, Alonso de Cordova 3107, Santiago, Chile

[13] Carnegie Observ, 813 Santa Barbara St, Pasadena, CA 91101 USA

[14] Univ Toledo, Ritter Astrophys Res Ctr, 2801 W Bancroft St, Toledo, OH 43606 USA

[15] Harvard Smithsonian Ctr Astrophys, Inst Theory & Computat, 60 Garden St,MS-51, Cambridge, MA 02138 USA

[16] Natl Observ Athens, Inst Astron Astrophys Space Applicat & Remote Sen, GR-15236 Athens, Greece

来源：

ASTROPHYSICAL JOURNAL | 2020年 / 888卷 / 02期

关键词：

Interacting galaxies; Star-forming regions; Luminous infrared galaxies; GRAVITATIONALLY LENSED GALAXIES; RESOLVED SPECTROSCOPY; MASSIVE GALAXIES; GIANT CLUMPS; EVOLUTION; Z-SIMILAR-TO-2; SCALE; DISKS; FIELD;

D O I：

10.3847/1538-4357/ab5dc3

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present HST narrowband near-infrared imaging of Pa alpha and Pa beta emission of 48 local luminous infrared galaxies (LIRGs) from the Great Observatories All-Sky LIRG Survey. These data allow us to measure the properties of 810 spatially resolved star-forming regions (59 nuclei and 751 extranuclear clumps) and directly compare their properties to those found in both local and high-redshift star-forming galaxies. We find that in LIRGs the star-forming clumps have radii ranging from similar to 90 to 900 pc and star formation rates (SFRs) of similar to 1 x 10(-3) to 10 M yr(-1), with median values for extranuclear clumps of 170 pc and 0.03 M yr(-1). The detected star-forming clumps are young, with a median stellar age of 8.7 Myr, and have a median stellar mass of 5 x 10(5) M. The SFRs span the range of those found in normal local star-forming galaxies to those found in high-redshift star-forming galaxies at z = 1-3. The luminosity function of the LIRG clumps has a flatter slope than found in lower-luminosity, star-forming galaxies, indicating a relative excess of luminous star-forming clumps. In order to predict the possible range of star-forming histories and gas fractions, we compare the star-forming clumps to those measured in the MassiveFIRE high-resolution cosmological simulation. The star-forming clumps in MassiveFIRE cover the same range of SFRs and sizes found in the local LIRGs and have total gas fractions that extend from 10% to 90%. If local LIRGs are similar to these simulated galaxies, we expect that future observations with ALMA will find a large range of gas fractions, and corresponding star formation efficiencies, among the star-forming clumps in LIRGs.

引用

页数：12

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