近红外波段红巨星支尖端距离测量方法的经验校准。II. JWST NIRCam 宽波段滤光片
An Empirical Calibration of the Tip of the Red Giant Branch Distance Method in the Near Infrared. II. JWST NIRCam Wide Filters
AI总结:
本文利用恒星颜色作为金属丰度/年龄代理,对 JWST NIRCam 六个宽波段滤光片中的 TRGB 光度进行标准化校准,并针对不同精度需求给出推荐滤光片组合,以将 TRGB 测距范围扩展至约 50 Mpc。
摘要:
红巨星支尖端(TRGB)是一种可标准化的烛光,在颜色-星等图(CMD)空间中可识别为红巨星支(RGB)恒星亮端的不连续处。基于 TRGB 的距离方法已利用哈勃空间望远镜(HST)的 I 波段等效 F814W 滤光片进行了校准,并用于测量距离 D≤20 Mpc 的星系,同时也是测量哈勃常数 H0 的距离阶梯中的重要一级。在红外(IR)波段,TRGB 的视星等比光学波段亮 1-2 个星等,如今借助红外詹姆斯·韦布空间望远镜(JWST)观测设备,TRGB 方法的可行距离范围可扩展至约 50 Mpc。然而,在红外波段,TRGB 的光度在不同程度上依赖于恒星的金属丰度和年龄。在本研究中,我们利用恒星颜色作为金属丰度/年龄的代理变量来标准化 TRGB 光度,从而为 JWST 近红外相机(NIRCam)的短波长(SW)滤光片 F090W、F115W、F150W 以及长波长(LW)滤光片 F277W、F356W 和 F444W 推导基于颜色的改正。我们根据所需精度提供了用于距离测量的推荐滤光片组合。对于需要高精度(距离误差≤1%)和稳健性的科学研究,我们推荐在 F090W 对 F090W-F150W 或 F115W 对 F115W-F277W 中测量 TRGB,但需注意即使在 JWST 上,在更远距离处也需要较长的积分时间。如果可以容忍较低精度(距离误差>1.5%),或者希望采用较短的积分时间,我们推荐在 F115W 或 F150W 中测量 TRGB,并与 F356W 配对。由于 F444W 的角分辨率较低,我们不推荐将其用于高精度 TRGB 测量。
英文摘要:
The tip of the red giant (TRGB) is a standardizable candle and is identifiable as the discontinuity at the bright extreme of the red giant branch (RGB) stars in color-magnitude diagram (CMD) space. The TRGB-based distance method has been calibrated and used to measured distances to galaxies out to $D\leq20$ Mpc with the $I$-band equivalent Hubble Space Telescope ($HST$) $F814W$ filter, and as an important rung in the distance ladder to measure the Hubble constant, $H_0$. In the infrared (IR), the TRGB apparent magnitude ranges from $1-2$ magnitudes brighter than in the optical, and now with the IR James Webb Space Telescope ($JWST$) observatory the feasible distance range of the TRGB method can be extended to $\sim50$ Mpc. However, in the IR the TRGB luminosity depends to varying degrees on stellar metallicity and age. In this study we standardize the TRGB luminosity using stellar colors as a proxy for metallicity/age to derive color-based corrections for the $JWST$ Near-Infrared Camera (NIRCam) short wavelength (SW) filters $F090W$, $F115W$, $F150W$ and the long wavelength (LW) filters $F277W$, $F356W,$ and $F444W$. We provide recommended filter combinations for distance measurements depending on the requisite precision. For science requiring high precision ($\leq1\%$ in distance) and robustness we recommend measuring the TRGB in $F090W$ vs $F090W-F150W$ or $F115W$ vs. $F115W-F277W$ with the caveat that even with $JWST$ long integration times will be necessary at further distances. If lower precision ($>1.5\%$ in distance) can be tolerated, or if shorter integration times are desirable, we recommend measuring the TRGB in either $F115W$ or $F150W$ paired with $F356W$. We do not recommend $F444W$ for precision TRGB measurements due to its lower angular resolution.
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