JWST MIRI Detections of Hα and [O Iii] and a Direct Metallicity Measurement of the Z = 10.17 Lensed Galaxy MACS0647−JD

Tiger Yu-Yang Hsiao,Javier Alvarez-Marquez，Erik Zackrisson,Adi Zitrin

The Astrophysical Journal（2024）SCI 2区SCI 3区

Cited 0|Views63

Abstract

JWST spectroscopy has revolutionized our understanding of galaxies in the early Universe. Covering wavelengths up to 5.3 mu m, NIRSpec can detect rest-frame optical H alpha emission lines out to z = 7 and [O iii] to z = 9.5. Observing these lines in more distant galaxies requires longer wavelength spectroscopy with MIRI. Here we present MIRI Medium Resolution Spectrograph integral field unit observations of the lensed galaxy merger MACS0647-JD at z = 10.165. With exposure times of 4.2 hr in each of two bands (SHORT and LONG), we detect H alpha at 9 sigma, [O iii] lambda 5008 at 11 sigma, and [O iii] lambda 4960 at 3 sigma. Combined with previously reported NIRSpec spectroscopy that yielded seven emission lines including the auroral line [O iii] lambda 4363, we present the first direct metallicity measurement of a z > 10 galaxy: 12+log(O/H)=7.79 +/- 0.09, or 0.13(-0.03)(+0.02)Z(circle dot). This is similar to galaxies at z similar to 4-9 with direct metallicity measurements, though higher than expected given the high specific star formation rate log(sSFR/yr(-1)) = -7.4 +/- 0.3. We further constrain the ionization parameter log(U) = -1.9 +/- 0.1, ionizing photon production efficiency log(xi(ion)) = 25.3 +/- 0.1, and SFR = 5.0 +/- 0.6 M-circle dot yr(-1) within the past 10 Myr. These observations demonstrate the combined power of JWST NIRSpec and MIRI for studying galaxies in the first 500 million years.

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Key words

Galaxies,High-redshift galaxies,Early universe,Strong gravitational lensing,Galaxy spectroscopy,Metallicity

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【要点】：本文利用JWST的NIRSpec和MIRI仪器，首次对红移z=10.165的透镜星系MACS0647-JD进行了直接金属licity测量，发现其金属licity与z∼4-9的星系相似，但高于预期。

【方法】：通过JWST的NIRSpec和MIRI MRS IFU观测，检测到Hα和[O III]发射线，结合NIRSpec的七个发射线数据，计算得到星系的金属licity。

【实验】：对MACS0647-JD星系进行4.2小时曝光的MIRI MRS IFU观测，检测到Hα、[O III]λ5008和[O III]λ4960，结合NIRSpec光谱数据，得到金属licity测量结果为12+ log(O/H)= 7.79±0.09，即0.13^+0.02_-0.03 Z_⊙。

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