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arXiv 2301.12976astro-ph.GA
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z=2-4时发光尘埃恒星形成星系中解析的CO(1-0)发射和气体性质

Resolved CO(1-0) emission and gas properties in luminous dusty star forming galaxies at z=2-4

F. Stanley, B. M. Jones, D. A. Riechers, C. Yang, S. Berta, P. Cox, T. J. L. C. Bakx, A. Cooray, H. Dannerbauer, S. Dye, D. H. Hughes, R. J. Ivison, S. Jin, M. … 展开作者

F. Stanley, B. M. Jones, D. A. Riechers, C. Yang, S. Berta, P. Cox, T. J. L. C. Bakx, A. Cooray, H. Dannerbauer, S. Dye, D. H. Hughes, R. J. Ivison, S. Jin, M. Lehnert, R. Neri, A. Omont, P. van der Werf, A. Weiss

摘要:

利用美国国家科学基金会的Karl G. Jansky甚大阵。所有源都在CO(1-0)中被探测到,角分辨率约为1角秒。七个源显示出扩展和复杂的结构。我们测量了$(μ)L'_{CO(1-0)}=0.4-2.9x10^{11}$ K km s $^{-1}$ pc $^2$的CO光度和($μ$)M $_{H2}$ = 1.3 - 8.6 × 10 $^{11}$ Mo的分子气体质量,其中(μ)是放大因子.导出的分子气体耗尽时间t $_{\rm dep}$ = 40 - 460百万年,涵盖了正常恒星形成星系和恒星爆发的预期范围。与以前观察到的相同源的高J CO跃迁相比,我们发现CO温度亮度比r $_{32/10}$ = 0.4 - 1.4,r $_{43/10}$ = 0.4 - 1.7,r $_{54/10}$ = 0.3 - 1.3。我们发现了广泛的CO谱线能量分布(SLED),与其他高Z DSFG的协议,除了三个来源是最可比的立体式和APM 08279 +5255。基于CO SLEDs的辐射传输模型,我们确定了n $_{H2}$ = 0.3 - 8.5 × 10 ~(-1)$^3$ cm $^{-3}$的密度和T $_K$ = 100 - 200 K的温度。最后,四个源中检测到的连续,三个无线电发射符合其红外衍生恒星形成率,而HerBS-70 E需要一个额外的同步辐射组件从一个活跃的星系核。总的来说,我们发现,即使样品在红外线下也同样发光,通过追踪CO(1-0)发射,揭示了星系和激发特性的多样性,证明了CO(1-0)观测结合高J跃迁的重要性。

英文摘要:

We present the results of a survey of CO(1-0) emission in 14 infrared luminous dusty star forming galaxies (DSFGs) at 2 < z < 4 with the NSF's Karl G. Jansky Very Large Array. All sources are detected in CO(1-0), with an ~1arcsec angular resolution. Seven sources show extended and complex structure. We measure CO luminosities of $(μ)L'_{CO(1-0)}=0.4-2.9x10^{11}$ K km s$^{-1}$ pc$^2$, and molecular gas masses of ($μ$)M$_{H2}$ = 1.3 - 8.6 x 10$^{11}$ Mo, where (μ) is the magnification factor. The derived molecular gas depletion times of t$_{\rm dep}$ = 40 - 460 Myr, cover the expected range of both normal star forming galaxies and starbursts. Comparing to the higher-J CO transitions previously observed for the same sources, we find CO temperature brightness ratios of r$_{32/10}$ = 0.4 - 1.4, r$_{43/10}$ = 0.4 - 1.7, and r$_{54/10}$ = 0.3 - 1.3. We find a wide range of CO spectral line energy distributions (SLEDs), in agreement with other high-z DSFGs, with the exception of three sources that are most comparable to the Cloverleaf and APM08279+5255. Based on radiative transfer modelling of the CO SLEDs we determine densities of n$_{H2}$ = 0.3 - 8.5 x 10$^3$ cm$^{-3}$ and temperatures of T$_K$ = 100 - 200 K. Lastly, four sources are detected in the continuum, three have radio emission consistent with their infrared derived star formation rates, while HerBS-70E requires an additional synchrotron radiation component from an active galactic nucleus. Overall, we find that even though the sample is similarly luminous in the infrared, by tracing the CO(1-0) emission a diversity of galaxy and excitation properties are revealed, demonstrating the importance of CO(1-0) observations in combination to higher-J transitions.

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