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Distance Measurements to Parent Galaxies of SNIa by the Tip of the Red-Giant Branch
Astrophysical Bulletin ( IF 1.2 ) Pub Date : 2020-07-27 , DOI: 10.1134/s1990341320020030
A. V. Antipova , D. I. Makarov , L. N. Makarova

Abstract—We use the archival data obtained with the Hubble space telescope to measure distances by the tip of the red-giant branch (TRGB) method to SNIa parent galaxies. Our sample consists of four galaxies: NGC2841, NGC4496A, NGC4535, and NGC4527. For three of them, we were able to determine only the lower bounds of the distance. For the galaxy NGC4527, we estimated the TRGB distance modulus: (m − M)0 = 30m.56 ± 0m.09. Combining our measurements with the published data, we compared the supernova distance moduli using the MLCS2k2 method and the host galaxies with the TRGB method. SNIa distance moduli show systematically higher value at 0m.15–0m.18 relative to the scale of the TRGB distances. This corresponds to overestimation of the luminosity of supernovae with the MLCS2k2 method. We estimated the luminosity of supernovae at the brightness maximum as MV = −19m.33 ± 0m.03 which allows one to accept the following Hubble constant: H0 = 70.4 ± 1.0 km s−1 Mpc−1.

中文翻译:

红巨星分支提示对SNIa父星系的距离测量

摘要—我们使用哈勃太空望远镜获得的档案数据通过红巨星分支(TRGB)方法的尖端来测量与SNIa母星系的距离。我们的样本由四个星系组成:NGC2841,NGC4496A,NGC4535和NGC4527。对于其中三个,我们只能确定距离的下限。对于星系NGC4527,我们估计了TRGB距离模量:(m  -  M0 = 30 m 56±0 m 09.结合我们的测量结果和已发布的数据,我们比较了使用MLCS2k2方法的超新星距离模量和使用TRGB方法的宿主星系。SNIa距离模量在0 m处系统地显示较高的值15-0 m 相对于TRGB距离的比例为18。这对应于用MLCS2k2方法高估了超新星的发光度。我们估计在亮度最大值为M V = -19 m时超新星的发光度33±0 m 03,它允许人们接受以下哈勃常数:H 0 = 70 4±1 0 km s -1 Mpc -1
更新日期:2020-07-27
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