Spatially Resolved Recent Star Formation History in NGC 6946

被引：2
作者：
Tran, Debby [1 ]
Williams, Benjamin [1 ]
Levesque, Emily [1 ]
Lazzarini, Margaret [2 ]
Dalcanton, Julianne [3 ]
Dolphin, Andrew [4 ,5 ]
Koplitz, Brad [6 ]
Smercina, Adam [1 ]
Telford, O. Grace [7 ]
机构：
[1] Univ Washington, Dept Astron, Box 351580, Seattle, WA 98195 USA
[2] CALTECH, Div Phys Math & Astron, 1200 East Calif Blvd, Pasadena, CA 91125 USA
[3] Flatiron Inst, Ctr Computat Astrophys, 162 Fifth Ave, New York, NY 10010 USA
[4] Raytheon Technol, 1151 East Hermans Rd, Tucson, AZ 85756 USA
[5] Univ Arizona, Steward Observ, 933 North Cherry Ave, Tucson, AZ 85721 USA
[6] Arizona State Univ, Sch Earth & Space Explorat, 781 Terrace Mall, Tempe, AZ 85287 USA
[7] Rutgers State Univ, Dept Phys & Astron, 136 Frelinghuysen Rd, Piscataway, NJ 08854 USA
来源：
ASTROPHYSICAL JOURNAL | 2023年 / 954卷 / 02期
关键词：
FORMATION RATE DIAGNOSTICS; SUPERNOVA PROGENITORS; NEARBY GALAXIES; MILKY-WAY; EVOLUTION; MASS; ASTROPY; MODELS; M31; UNCERTAINTIES;
D O I：
10.3847/1538-4357/aced44
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The nearby face-on star-forming spiral galaxy NGC 6946 is known as the Fireworks Galaxy due to its hosting an unusually large number of supernovae. We analyze its resolved near-ultraviolet stellar photometry measured from images taken with the Hubble Space Telescope's Wide Field Camera 3 with the F275W and F336W filters. We model the color-magnitude diagrams of the UV photometry to derive the spatially resolved star formation history of NGC 6946 over the last 25 Myr. From this analysis, we produce maps of the spatial distribution of the young stellar population and measure the total recent star formation rate (SFR) of nearly the entire young stellar disk. We find the global SFR(age & LE;25 Myr) = 13.17-0.79+0.91M & ODOT;yr-1 . Over this period, the SFR is initially very high ( 23.39-2.11+2.43M & ODOT;yr-1 16-25 Myr ago), then monotonically decreases to 5.31-0.17+0.19M & ODOT;yr-1 in the last 10 Myr. This decrease in global SFR over the last 25 Myr is consistent with measurements made with other SFR indicators. We discuss in detail two of the most active regions of the galaxy, which we find are responsible for 3% and 5% of the total star formation over the past 6.3 Myr.
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页数：14
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