The tight correlation between PAH and CO emission from z ∼ 0 to 4

IF 5.4 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Astronomy & Astrophysics Pub Date : 2024-10-25 DOI:10.1051/0004-6361/202451826
Irene Shivaei, Leindert A. Boogaard
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Abstract

Aims. The cold molecular gas mass is one of the crucial, yet challenging, parameters in galaxy evolution studies. Here, we introduce a new calibration and a method for estimating molecular gas masses using mid-infrared (MIR) photometry. This topic is timely as the James Webb Space Telescope (JWST) now allows us to detect the MIR emission of typical main-sequence galaxies across a wide range of masses and star formation rates with modest time investments. Additionally, this Letter highlights the strong synergy between ALMA and JWST for studies of dust and gas at cosmic noon.Methods. We combined a sample of 14 main-sequence galaxies at z = 1 − 3 with robust CO detections and multi-band MIR photometry, along with a literature sample at z = 0 − 4 with CO and polycyclic aromatic hydrocarbon (PAH) spectroscopy, to study the relationship between PAH, CO(1–0), and total IR luminosities. PAH luminosities are derived by modelling a wealth of rest-frame UV to sub-millimetre data. The new z = 1 − 3 sample extends previous high-z studies to PAH and CO luminosities that are about an order of magnitude lower, into the regime of local starbursts, for the first time.Results. The PAH-to-CO luminosity ratio remains constant across a wide range of luminosities, for various galaxy types, and throughout the explored redshift range. In contrast, the PAH-to-IR and CO-to-IR luminosity ratios deviate from a constant value at high IR luminosities. The intrinsic scatter in the L(PAH)–L′(CO) relation is 0.21 dex, with a median of 1.40 and a power-law slope of 1.07 ± 0.04. Both the PAH–IR and CO–IR relations are sub-linear. Given the tight and uniform PAH–CO relation over ∼3 orders of magnitude, we provide a recipe for estimating the cold molecular gas mass of galaxies from PAH luminosities, with a PAH-to-molecular gas conversion factor of αPAH7.7 = (3.08 ± 1.08)(4.3/αCO) M/L. This method opens a new window to explore the gas content of galaxies beyond the local Universe using multi-wavelength JWST/MIRI imaging.
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从 z ∼ 0 到 4,多环芳烃和 CO 辐射之间的紧密相关性
研究目的冷分子气体质量是星系演化研究的关键参数之一,但也是具有挑战性的参数。在这里,我们介绍一种新的校准方法,以及利用中红外(MIR)光度法估算分子气体质量的方法。现在,詹姆斯-韦伯太空望远镜(JWST)可以让我们以适度的时间投入,探测典型主序星系在不同质量和恒星形成率范围内的中红外辐射,因此这一课题非常及时。此外,这封信还强调了 ALMA 和 JWST 在研究宇宙正午的尘埃和气体方面的强大协同作用。我们将z = 1 - 3的14个主序星系样本与z = 0 - 4的一个具有CO和多环芳烃(PAH)光谱的文献样本结合起来,研究PAH、CO(1-0)和红外总光度之间的关系。PAH光度是通过对大量静帧紫外到亚毫米波数据建模得出的。新的 z = 1 - 3 样本将以前的高 z 研究扩展到了 PAH 和 CO 光度,这些光度低了大约一个数量级,首次进入了本地星爆的范围。PAH 与 CO 的光度比在很宽的光度范围内保持恒定,适用于各种类型的星系,并贯穿所探索的红移范围。相比之下,PAH-IR和CO-IR光度比在高红外光度时偏离了恒定值。L(PAH)-L′(CO)关系的内在散度为 0.21 dex,中值为 1.40,幂律斜率为 1.07 ± 0.04。PAH-IR关系和CO-IR关系都是亚线性关系。鉴于PAH-CO关系在∼3个数量级上紧密一致,我们提供了一个从PAH光度估算星系冷分子气体质量的方法,PAH-分子气体转换因子为αPAH7.7 = (3.08 ± 1.08)(4.3/αCO) M⊙/L⊙。这种方法为利用多波长 JWST/MIRI 成像探索本宇宙以外星系的气体含量打开了一扇新窗口。
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来源期刊
Astronomy & Astrophysics
Astronomy & Astrophysics 地学天文-天文与天体物理
CiteScore
10.20
自引率
27.70%
发文量
2105
审稿时长
1-2 weeks
期刊介绍: Astronomy & Astrophysics is an international Journal that publishes papers on all aspects of astronomy and astrophysics (theoretical, observational, and instrumental) independently of the techniques used to obtain the results.
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