1 < z < 9 红移范围内利用空间分辨测光和中带滤光片对总恒星质量测量的系统评估：质光比变化与遮蔽效应的影响
A Systematic Assessment of Total Stellar Mass Measurements with Spatially Resolved Photometry and Medium Bands at 1 < z < 9: The Impact of Mass-to-Light Variations and Outshining
- York University（约克大学）
- University of Colorado（科罗拉多大学）
- Columbia University（哥伦比亚大学）
- Dunlap Institute for Astronomy and Astrophysics（邓拉普天文学与天体物理研究所）
- National Research Council of Canada, Herzberg Astronomy & Astrophysics Research Centre（加拿大国家研究委员会赫茨伯格天文学与天体物理研究中心）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
利用JWST和HST空间分辨测光，系统评估了1<z<9星系恒星质量测量的偏差，发现整体测光低估质量，高sSFR星系偏差达-0.36 dex，且分辨测光可减轻中波段缺失的影响。
AI中文摘要：
JWST NIRCam空间分辨测光使得在亚千秒差距尺度上研究星系恒星种群和恒星质量成为可能。我们利用JWST（CANUCS、Technicolor、JUMPS）和HST数据，覆盖宽波段和中波段紫外-红外滤光片，研究了约3000个位于1 < z_phot < 9的星系在空间分辨测光与整体测光之间的恒星质量偏差。二维参数图揭示了恒星质量和种群的空间变化，表明整体测量系统性地低估了恒星质量。我们发现，对于比恒星形成率sSFR < 10^-9 yr^-1的星系，恒星质量偏差仍然较小，但对于sSFR > 10^-8.5 yr^-1的星系，偏差增大。对于这些高sSFR星系，中值偏移达到Δlog10(M*) ~ -0.36 dex，最大偏差出现在低质量（M* ≤ 10^9.5 M_sun）星系中。这些结果与近期恒星形成对老年种群的遮蔽效应一致。高sSFR星系在其质光比（M*/L_V）上也表现出空间变化：对于10^-8 ≤ sSFR[yr^-1] < 10^-9的星系，恒星质量偏差随σ[log10(M*/L_V)]减小，对于10^-7 ≤ sSFR[yr^-1] < 10^-8的星系趋势最强，由Spearman相关系数ρ_S = -0.37量化。虽然中波段对于从整体测光约束恒星质量很重要，但空间分辨测光降低了其缺失的影响，当仅包含宽波段时，整体测光的弥散偏移为Δlog10(M*) = 0.33 dex，而分辨测光仅为0.15 dex。
英文摘要：
JWST NIRCam spatially resolved photometry enables studies of galaxies' stellar populations and stellar masses on sub-kpc scales. We use JWST (CANUCS, Technicolor, JUMPS) and HST data, covering wide- and medium-band UV-IR filters to study the stellar mass bias between spatially resolved and integrated photometry of $\sim$3000 galaxies at 1 $<z_{\mathrm{phot}}<$ 9. The 2D parameter maps reveal spatial variations in stellar mass and populations, showing that integrated measurements systematically underestimate stellar masses. We find that the stellar mass bias remains small for galaxies with specific star formation rate $\mathrm{sSFR} < 10^{\mathrm{-9}}$ yr$^{\mathrm{-1}}$, but increases for galaxies with $\mathrm{sSFR} > 10^{\mathrm{-8.5}}$ yr$^{\mathrm{-1}}$. For these high-sSFR galaxies, the median offset reaches $Δ\log_{\mathrm{10}} (M_{\ast})$ $\sim$ -0.36 dex with the largest bias occurring in low-mass ($M_{\ast} \leq 10^{\mathrm{ 9.5}} M_{\odot}$) galaxies. These results are consistent with the outshining of older populations by recent star formation. High-sSFR galaxies also show spatial variations in their mass-to-light ratios ($M_{\ast}/L_{V}$): the stellar mass bias decreases with $σ[\log_{\mathrm{10}}(M_{\ast}/L_{V})]$ for galaxies with $10^{\mathrm{-8}} \leq \mathrm{sSFR}[\mathrm{yr}^{\mathrm{-1}}] < 10^{\mathrm{-9}}$, with the strongest trend for $10^{\mathrm{-7}} \leq \mathrm{sSFR}[\mathrm{yr}^{\mathrm{-1}}] < 10^{\mathrm{-8}}$, quantified by the Spearman correlation coefficient $ρ_{\rm S}=-0.37$. While medium bands are important for constraining stellar masses from integrated photometry, spatially resolved photometry reduces the impact of their absence, with dispersion offsets of $Δ\log_{\mathrm{10}} (M_{\ast})$ = 0.33 dex for integrated photometry but 0.15 dex for resolved photometry when only wide-bands are included.
