Subaru Suprime-Cam Wide-field BVI Stellar Photometry of the M33 Galaxy

Rima Stonkutė and Vladas Vansevičius
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Abstract

We have surveyed the complete extent of the disk of M33—a gas-rich low-mass dwarf spiral galaxy in the Local Group. The B-, V-, and I-passband (the Johnson–Cousins system) CCD images (typical seeing ∼0.″8) were obtained with the Subaru Telescope equipped with the Suprime-Cam mosaic camera. The wide-field (∼1.°0 × 1.°5) catalog of 803,095 (15 ≤ V ≤ 25) starlike objects, measured using the point-spread function and aperture photometry techniques, is presented. We determined the distance modulus of M33 using the tip of the red giant branch (ITRGB = 20.64 ± 0.02) as a reference point of (m − M)0 = 24.63 ± 0.02stat ± 0.06syst (843 kpc). We found young (≲100 Myr) stellar populations residing up to the deprojected radius of ∼10 kpc. The scale length of the young main-sequence (MS) star surface-number density in the range of radial distances from 7 to 9 kpc is 0.53 ± 0.03 kpc. The youngest MS stars (≲15 Myr) reside up to the radius of ∼8 kpc. This distribution of stellar populations may suggest an outside-in scenario of recent star formation in the disk of M33.
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M33 银河系的 Subaru Suprime-Cam 宽视场 BVI 恒星光度测量法
我们勘测了本星系群中M33--一个富含气体的低质量矮旋涡星系--圆盘的全部范围。B波段、V波段和I波段(约翰逊-考辛斯系统)CCD图像(典型视角∼0.″8)是用配备了Suprime-Cam镶嵌相机的Subaru望远镜获得的。利用点展函数和孔径光度测量技术,得到了包含 803,095 个(15 ≤ V ≤ 25)星状天体的宽视场(∼1.°0 × 1.°5)星表。我们以红巨分支顶端(ITRGB = 20.64 ± 0.02)为参考点,确定了 M33 的距离模数为 (m - M)0 = 24.63 ± 0.02stat ± 0.06syst (843 kpc)。我们发现了年轻的(≲100 Myr)恒星群,其驻留半径可达 ∼10 kpc。在 7 到 9 kpc 的径向距离范围内,年轻主序(MS)恒星表面数密度的尺度长度为 0.53 ± 0.03 kpc。最年轻的主序星(≲15 Myr)的驻留半径可达 ∼ 8 kpc。这种恒星种群的分布可能暗示了M33星盘中最近恒星形成的一种外来情景。
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