SHOCKED POSTSTARBURST GALAXY SURVEY. II. THE MOLECULAR GAS CONTENT AND PROPERTIES OF A SUBSET OF SPOGs

SHOCKED POSTSTARBURST GALAXY SURVEY. II. THE MOLECULAR GAS CONTENT AND PROPERTIES OF A SUBSET OF SPOGs
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令人震惊的星爆后星系调查。

DOI:
10.3847/0004-637x/827/2/106
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发表时间:
2016
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Nrao
Nrao
中科院分区:
--
文献类型:
--
作者:
K. Alatalo;U. Lisenfeld;L. Lanz;P. Appleton;S. Cales;L. Kewley;M. Lacy;A. Medling;K. Nyland;J. Rich;C. Observatories;U. Granada;Ipac;Yale;A. N. University;Nrao

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我们展示了用射电天文学研究所 Millimétrique 30 m 单碟和毫米天文干涉仪研究组合阵列进行的冲击星爆后星系巡天中天体的 CO(1-0) 观测结果。激波后星爆发星系(SPOG)代表了一个过渡星系群,具有深巴尔默吸收,与中龄(A星)恒星群一致,电离气体线比率与纯恒星形成不一致。 CO(1–0) 子样本是从广域红外测量探测器检测到的 SPOG 中选择的,检测到的信噪比 (S/N) > 3 时检测到的 22 μm 通量。在 CO(1–0) 中观察到的 52 个物体中,检测到的 47 个物体的 S/N > 3。我们的 CO-SPOG 样本的很大一部分 (37%–46% ± 7%) 在视觉上被分类为形态破坏。检测到的 H2 质量在 之间,与正常星系中发现的气体质量一致,尽管比星爆发后星系中看到的范围大大约一个数量级。当比较 22 μm 和 CO(1–0) 通量时,SPOG 偏离了正常的恒星形成关系,22 μm 通量超出了该关系的 1 倍,表明存在活动星系核 (AGN)。 CO-SPOG 的 Na i D 特征表明,这些物体中的许多可能存在星际风。 Na i D 增强的物体也倾向于在无线电中发射,这表明 AGN 可能驱动中性风。
We present CO(1–0) observations of objects within the Shocked POststarburst Galaxy Survey taken with the Institut de Radioastronomie Millimétrique 30 m single dish and the Combined Array for Research for Millimeter Astronomy interferometer. Shocked poststarburst galaxies (SPOGs) represent a transitioning population of galaxies, with deep Balmer absorption , consistent with an intermediate-age (A-star) stellar population, and ionized gas line ratios inconsistent with pure star formation. The CO(1–0) subsample was selected from SPOGs detected by the Wide-field Infrared Survey Explorer with 22 μm flux detected at a signal-to-noise ratio (S/N) > 3. Of the 52 objects observed in CO(1–0), 47 are detected with S/N > 3. A large fraction (37%–46% ± 7%) of our CO-SPOG sample were visually classified as morphologically disrupted. The H2 masses detected were between , consistent with the gas masses found in normal galaxies, though approximately an order of magnitude larger than the range seen in poststarburst galaxies. When comparing the 22 μm and CO(1–0) fluxes, SPOGs diverge from the normal star-forming relation, having 22 μm fluxes in excess of the relation by a factor of , suggestive of the presence of active galactic nuclei (AGNs). The Na i D characteristics of CO-SPOGs show that it is likely that many of these objects host interstellar winds. Objects with large Na i D enhancements also tend to emit in the radio, suggesting possible AGN driving of neutral winds.
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