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arXiv 1306.2306astro-ph.CO
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红巨星分支的尖端距离Ia型超新星宿主星系。II。狮子座I组中的M66和M96

The Tip of the Red Giant Branch Distances to Type Ia Supernova Host Galaxies. II. M66 and M96 in the Leo I Group

Myung Gyoon Lee, In Sung Jang

摘要:

狮子座I群的M66和M96是附近的螺旋星系,拥有Ia型超新星(SNe Ia)。我们从红巨星分支(TRGB)顶端的光度估计到这些星系的距离。我们获得$VI$测光的$F555W$和$F814W$图像在这些星系中的解决的恒星在{ \it哈勃太空望远镜}档案。从这些红巨星的光度函数中,我们发现TRGB $I$带的星等是M66的$I_{\rm TRGB}=26.20\pm0.03$和M96的$26.21\pm0.03$。这些值产生M66的距离模数$(m-M)_0=30.12\pm0.03 ({\rm random})\pm0.12 ({\rm systematic})$和M96的距离模数$(m-M)_0=30.15\pm0.03 ({\rm random})\pm0.12 ({\rm systematic})$。这些结果表明,他们确实是同一个群体的成员。利用这些结果,我们得到了两个SNe(M66中的SN 1989 B和M96中的SN 1998 bu)的绝对最大星等。这些Ia型超新星的$V$波段星等是$\sim$ 0.2等,比M101中的SN 2011 fe暗,后者是最近的Ia型超新星。我们还推导出SN 1998 bu的近红外星等。三个Ia型超新星(SN 1989 B、SN 1998 bu和SN 2011 fe)的光学星等基于TRGB分析得出哈勃常数,$H_0=67.6\pm1.5 ({\rm random})\pm 3.7({\rm systematic})$ \kmsMpc。该值与最近WMAP 9结果$H_0=69.32\pm0.80$ \kmsMpc得出的值相似。%和来自普朗克的结果,$H_0=67.3\pm1.2$ \kmsMpc,但小于最近基于造父变星对SNe Ia光度的校准的其他测定,$H_0 = 74 \pm3$ km s $^{-1}$ Mpc $^{-1}$。

英文摘要:

M66 and M96 in the Leo I Group are nearby spiral galaxies hosting Type Ia Supernovae (SNe Ia). We estimate the distances to these galaxies from the luminosity of the tip of the red giant branch (TRGB). We obtain $VI$ photometry of resolved stars in these galaxies from $F555W$ and $F814W$ images in the {\it Hubble Space Telescope} archive. From the luminosity function of these red giants we find the TRGB $I$-band magnitude to be $I_{\rm TRGB}=26.20\pm0.03$ for M66 and $26.21\pm0.03$ for M96. These values yield distance modulus $(m-M)_0=30.12\pm0.03 ({\rm random})\pm0.12 ({\rm systematic})$ for M66 and $(m-M)_0=30.15\pm0.03 ({\rm random})\pm0.12 ({\rm systematic})$ for M96. These results show that they are indeed the members of the same group. With these results we derive absolute maximum magnitudes of two SNe (SN 1989B in M66 and SN 1998bu in M96). $V$-band magnitudes of these SNe Ia are $\sim$0.2 mag fainter than SN 2011fe in M101, the nearest recent SN Ia. We also derive near-infrared magnitudes for SN 1998bu. Optical magnitudes of three SNe Ia (SN 1989B, SN 1998bu, and SN 2011fe) based on TRGB analysis yield a Hubble constant, $H_0=67.6\pm1.5 ({\rm random})\pm 3.7({\rm systematic})$ \kmsMpc. This value is similar to the values derived from recent WMAP9 results, $H_0=69.32\pm0.80$ \kmsMpc. % and from Planck results, $H_0=67.3\pm1.2$ \kmsMpc, but smaller than other recent determinations based on Cepheid calibration for SNe Ia luminosity, $H_0 = 74 \pm3$ km s$^{-1}$ Mpc$^{-1}$.

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