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arXiv 1812.00534astro-ph.GA
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校准詹姆斯韦伯太空望远镜过滤器作为恒星形成率指标

Calibrating the James Webb Space Telescope filters as star formation rate indicators

Madhooshi R. Senarath, Michael J. I. Brown, Michelle E. Cluver, John Moustakas, Lee Armus, T. H. Jarrett

摘要:

我们校准了6.5米詹姆斯韦伯太空望远镜(JWST)的中红外滤光片作为恒星形成率指标,使用JWST测光合成的$Spitzer$光谱的49个低红移星系,其中包括一个更广泛的光度范围比大多数以前的研究。我们使用巴尔末衰减校正的$\rm{Hα}$光度和合成的中红外光度学经验校准的$Spitzer$,WISE和JWST过滤器作为恒星形成率指标。我们的$Spitzer$和WISE校准与最近的校准文献中有很好的一致性。对于高光度星系,中红外光度可能与恒星形成率成正比,而对于低光度星系($L_{\rm Hα} \leq 10^{43}~{\rm erg~s^{-1}}$),中红外光度与恒星形成率之间存在幂律关系。我们发现,对于$\rm{Hα}$光度为$\rm{10^{40}}~erg~s^{-1}$(对应恒星形成率为$\sim 0.055~{\rm M_\odot~yr^{-1}}$)的星系,对应的JWST中红外$νL_ν$光度介于$\rm{10^{40.50}}$和$\rm{10^{41.00}}~erg~s^{-1}$之间。JWST光度作为$\rm{Hα}$光度的函数的幂律拟合的指数在1.17和1.32之间。我们发现,在JWST过滤器校准的散射随着波长从0.39到0.20 dex的增加而减少,虽然F1000W是一个例外,散射仅为0.24 dex。

英文摘要:

We have calibrated the 6.5 m James Webb Space Telescope (JWST) mid-infrared filters as star formation rate indicators, using JWST photometry synthesized from $Spitzer$ spectra of 49 low redshift galaxies, which cover a wider luminosity range than most previous studies. We use Balmer decrement corrected $\rm{Hα}$ luminosity and synthesized mid-infrared photometry to empirically calibrate the $Spitzer$, WISE and JWST filters as star formation rate indicators. Our $Spitzer$ and WISE calibrations are in good agreement with recent calibrations from the literature. While mid-infrared luminosity may be directly proportional to star formation rate for high luminosity galaxies, we find a power-law relationship between mid-infrared luminosity and star formation rate for low luminosity galaxies ($L_{\rm Hα} \leq 10^{43}~{\rm erg~s^{-1}}$). We find that for galaxies with a $\rm{Hα}$ luminosity of $\rm{10^{40}}~erg~s^{-1}$ (corresponding to a star formation rate of $\sim 0.055~{\rm M_\odot~yr^{-1}}$), the corresponding JWST mid-infrared $νL_ν$ luminosity is between $\rm{10^{40.50}}$ and $\rm{10^{41.00}}~erg~s^{-1}$. Power-law fits of JWST luminosity as a function of $\rm{Hα}$ luminosity have indices between 1.17 and 1.32. We find that the scatter in the JWST filter calibrations decreases with increasing wavelength from 0.39 to 0.20 dex, although F1000W is an exception where the scatter is just 0.24 dex.

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