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DETERMINING THE MOTION OF THE LOCAL GROUP USING TYPE Ia SUPERNOVAE LIGHT CURVE SHAPES

机译:使用Ia型超新星光曲线形状确定局部基团的运动

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We have measured our Galaxy's motion relative to distant galaxies in which Type Ia supernovae (SNe Ia) have been observed. The effective recession velocity of this sample is 7000 km s~(-1), which approaches the depth of the survey of brightest cluster galaxies by Lauer & Postman (1994). We use the light curve shape (LCS) method for deriving distances to SNe Ia, providing relative distance estimates to individual supernovae with a precision of ~5% (Riess, Press, & Kirshner 1995). Analyzing the distribution on the sky of velocity residuals from a pure Hubble flow for 13 recent SNe Ia drawn primarily from the Calan/Tololo survey (Hamuy 1993a, 1994, 1995a, b; Maza et al. 1994), we find the best solution for the motion of the Local Group in this frame is 600 ± 350 km s~(-1) in the direction l = 260°, b = +54°, with a 1 σ error ellipse that measures 90° x 25°. This solution is consistent with the rest frame of the cosmic microwave background (CMB) as determined by the COBE measurement of the dipole temperature anisotropy, and also with many plausible bulk flows expected to accompany observed density variations. It is inconsistent with the velocity observed by Lauer & Postman.
机译:我们已经测量了银河系相对于已观测到Ia型超新星(SNe Ia)的遥远星系的运动。该样本的有效衰退速度为7000 km s〜(-1),接近Lauer&Postman(1994)研究的最亮星团的深度。我们使用光曲线形状(LCS)方法得出到SNe Ia的距离,从而为单个超新星提供相对距离的估计值,精确度约为5%(Riess,Press,&Kirshner 1995)。分析主要来自Calan / Tololo调查(Hamuy 1993a,1994,1995a,b; Maza et al。1994)的13个最近的SNe Ia在纯哈勃流中速度残差在天空中的分布,我们找到了最佳解在该帧中,本地组在l = 260°,b = + 54°方向上的运动为600±350 km s〜(-1),其1σ误差椭圆为90°x 25°。该解决方案与通过偶极温度各向异性的COBE测量确定的宇宙微波背景(CMB)的其余框架一致,并且还与预期的伴随观察到的密度变化的许多可能的体积流量一致。它与Lauer&Postman观察到的速度不一致。

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