论文标题
来自附近Galaxy NGC 4414中的两个兄弟式IA超新星的哈勃常数：SN 1974G和SN 2021J
The Hubble constant from two sibling Type Ia supernovae in the nearby galaxy NGC 4414: SN 1974G and SN 2021J
论文作者
论文摘要
在同一星系中拥有两个“兄弟姐妹”类型的IA Supernovae（Sne IA），在减少估计哈勃常数的各种系统错误方面具有其他优势，$ h_ {0} $。 NGC 4414是Hubble空间望远镜密钥项目中包含的附近星系，可使用头孢虫变量测量其距离。它主持了两个兄弟姐妹：SN 2021J和SN 1974G。这提供了提高$ h_ {0} $的先前估计值的精确度，该估计仅基于SN 1974G。在这里，我们介绍了在内华达州的Sierra de Sierra中获得的新光学$ BVRI $光度法，并与Swift Uvot $ UBV $ DATA补充，该数据涵盖了SN 2021J的发射前70天。首次查看使用Gran Telescopio Canarias（GTC）获得的SN 2021J光谱揭示了典型的SN型IA特征。使用基于模板的光曲线拟合代码Snoopy获得了两个兄弟姐妹SNE的主要SN光度参数。使用分层贝叶斯方法，我们构建了哈勃图，并从红移范围内的Pantheon样本中获得的96 sne IA样本$ z = 0.02-0.075 $，并用Ngc 4414中的两个sibling type-ia sne sne sne sne pmble $ pmble $ pmble $ pmble $ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_ h_h_ pm y okim。 2.32 $（stat。）$ \ pm 3.42 $（syst。）km s $^{ - 1} $ mpc $^{ - 1} $。我们期望使用即将到来的Gaia DR4以及来自HST和JWST的其他头囊对Cepheids周期 - 渗透率关系进行新的分析后，系统误差会减少。
Having two "sibling" Type Ia supernovae (SNe Ia) in the same galaxy offers additional advantages in reducing a variety of systematic errors involved in estimating the Hubble constant, $H_{0}$. NGC 4414 is a nearby galaxy included in the Hubble Space Telescope Key Project to measure its distance using Cepheid variables. It hosts two sibling SNe Ia: SN 2021J and SN 1974G. This provides the opportunity to improve the precision of the previous estimate of $H_{0}$, which was based solely on SN 1974G. Here we present new optical $BVRI$ photometry obtained at the Observatorio de Sierra Nevada and complement it with Swift UVOT $UBV$ data, which cover the first 70 days of emission of SN 2021J. A first look at SN 2021J optical spectra obtained with the Gran Telescopio Canarias (GTC) reveals typical SN type Ia features. The main SN luminosity parameters for the two sibling SNe are obtained by using SNooPy, a light curve fitting code based on templates. Using a hierarchical bayesian approach, we build the Hubble diagram with a sample of 96 SNe Ia obtained from the Combined Pantheon Sample in the redshift range $z = 0.02-0.075$, and calibrate the zero point with the two sibling type-Ia SNe in NGC 4414. We report a value of the Hubble constant $H_{0}$ $= 72.19 \pm 2.32$ (stat.) $\pm 3.42$ (syst.) km s$^{-1}$Mpc$^{-1}$. We expect a reduction of the systematic error after a new analysis of the Cepheids period-luminosity relation using the upcoming Gaia DR4 and additional Cepheids from the HST and JWST.
