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arXiv 2406.03532astro-ph.CO
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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

Max J. B. Newman, Kristen B. W. McQuinn, Evan D. Skillman, Martha L. Boyer, Roger E. Cohen, Andrew E. Dolphin, O. Grace Telford

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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