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首页> 外文期刊>The Astrophysical journal >THE TIP OF THE RED GIANT BRANCH DISTANCE TO THE PERFECT SPIRAL GALAXY M74 HOSTING THREE CORE-COLLAPSE SUPERNOVAE
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THE TIP OF THE RED GIANT BRANCH DISTANCE TO THE PERFECT SPIRAL GALAXY M74 HOSTING THREE CORE-COLLAPSE SUPERNOVAE

机译:红色巨型分支距离到完美的螺旋银河系M74拥有三个核心折叠超新星的提示

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M74 (NGC?628) is a famous face-on spiral galaxy, hosting three core-collapse supernovae (SNe): SN?Ic 2002ap, SN?II-P 2003gd, and SN?II-P 2013ej. However, its distance is not well known. We present a distance estimation for this galaxy based on the Tip of the Red Giant Branch (TRGB) method. We obtain photometry of the resolved stars in the arm-free region of M74 from F555W and F814W images in the Hubble Space Telescope archive. The color-magnitude diagram of the resolved stars shows a dominant red giant branch (RGB) as well as blue main sequence stars, red helium burning stars, and asymptotic giant branch stars. The I-band luminosity function of the RGB stars shows the TRGB to be at I TRGB = 26.13 ± 0.03?mag, and T RGB = 25.97 ± 0.03. From this, we derive the distance modulus to M74 to be 30.04 ± 0.04 (random) ± 0.12 (systematic) (corresponding to a linear distance of 10.19 ± 0.14 ± 0.56?Mpc). With this distance estimate, we calibrate the standardized candle method for SNe?II-P. From the absolute magnitudes of SN?2003gd, we derive a value of the Hubble constant, H 0 = 72 ± 6 (random)?± 7 (systematic)?km?s–1?Mpc–1. It is similar to recent estimates based on the luminosity calibration of Type?Ia supernovae.
机译:M74(NGC?628)是著名的面对旋星系,拥有三个核心坍缩的超新星(SNe):SN?Ic 2002ap,SN?II-P 2003gd和SN?II-P 2013ej。但是,它的距离不是很清楚。我们基于“红巨星分支”(TRGB)的技巧介绍了该星系的距离估计。我们从哈勃太空望远镜档案库中的F555W和F814W图像中获得M74的无臂区域中分辨出的恒星的光度法。分辨星的色度图显示了一个主要的红色巨星(RGB)以及蓝色主序星,红色氦燃烧星和渐近巨星。 RGB星的I波段发光度函数显示TRGB为I TRGB = 26.13±0.03?mag,T RGB = 25.97±0.03。由此,我们得出到M74的距离模数为30.04±0.04(随机)±0.12(系统性)(对应于10.19±0.14±0.56?Mpc的线性距离)。以此距离估算值,我们可以校准SNe?II-P的标准化烛光法。从SN?2003gd的绝对大小,我们得出哈勃常数的值,H 0 = 72±6(随机)?±7(系统性)?km?s-1?Mpc-1。它类似于基于Iaa型超新星的光度校准的最新估计。

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