Radio Morphology of Red Geysers
Radio Morphology of Red Geysers
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DOI：
10.3847/1538-4357/ac24a0
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发表时间：
2021-09
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通讯作者：
N. Roy;E. Moravec;K. Bundy;M. Hardcastle;G. Gürkan;Ranieri Diego Baldi;S. Leslie;K. Masters;J. Gelfand;R. Riffel;R. Riffel;Beatriz Mingo Fernandez;A. Drabent
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作者：
N. Roy;E. Moravec;K. Bundy;M. Hardcastle;G. Gürkan;Ranieri Diego Baldi;S. Leslie;K. Masters;J. Gelfand;R. Riffel;R. Riffel;Beatriz Mingo Fernandez;A. Drabent
我们提出了150 MHz，1.4 GHz和3 GHz的无线电成像（LoTSS，FIRST和VLASS）和空间分辨电离气体特性（SDSS IV-MaNGA）的140个本地（z < 0.1）早期型红间歇泉星系。这些星系的星星形成活动较低（星星形成率SFR为0.01 M·yr-1），但在空间分辨的发射线图上显示出独特的扩展模式，这些模式被解释为活动星系核（AGN）驱动的大尺度电离风。在这项工作中，我们确认红色间歇泉拥有低光度射电源（L 1.4GHz ~ 1022 WHz −1）。在42个无线电探测到的红色间歇泉中，有32个在LoTSS和FIRST中得到了空间分辨，其无线电大小在1.5 -25 kpc之间变化。有三个源的无线电大小超过40千秒差距。大多数显示出紧凑的射电形态，与低功率紧凑射电源（FR 0星系）或无线电安静类星体一致。它们可能是由小规模的活动星系核驱动的喷流提供动力的，这些喷流在目前5英寸的无线电数据分辨率下仍然无法解决。扩展射电源不属于“紧凑”形态类，其光谱较陡，平均光谱指数为−0.67，表明叶瓣成分占主导地位。拥有扩展射电源的红色间歇泉也具有最低的特定SFR，这表明它们对周围的星际介质有更大的影响，或者平均在更大质量的晕中发现。电离风锥和射电扩展特征的排列角度为0°或90°，表明星际介质和射电活动星系核之间可能存在相互作用。
We present 150 MHz, 1.4 GHz, and 3 GHz radio imaging (LoTSS, FIRST, and VLASS) and spatially resolved ionized gas characteristics (SDSS IV-MaNGA) for 140 local (z < 0.1) early-type red geyser galaxies. These galaxies have a low star formation activity (with a star formation rate, SFR, ∼ 0.01 M ⊙ yr−1), but show unique extended patterns in spatially resolved emission-line maps that have been interpreted as large-scale ionized winds driven by active galactic nuclei (AGN). In this work, we confirm that red geysers host low-luminosity radio sources (L 1.4GHz ∼ 1022 WHz −1). Out of 42 radio-detected red geysers, 32 are spatially resolved in LoTSS and FIRST, with radio sizes varying between ∼5–25 kpc. Three sources have radio sizes exceeding 40 kpc. A majority display a compact radio morphology and are consistent with either low-power compact radio sources (FR0 galaxies) or radio-quiet quasars. They may be powered by small-scale AGN-driven jets that remain unresolved at the current 5″ resolution of radio data. The extended radio sources, not belonging to the “compact” morphological class, exhibit steeper spectra with a median spectral index of −0.67, indicating the dominance of lobed components. The red geysers hosting extended radio sources also have the lowest specific SFRs, suggesting they either have a greater impact on the surrounding interstellar medium or are found in more massive halos on average. The degree of alignment of the ionized wind cone and the extended radio features are either 0° or 90°, indicating possible interaction between the interstellar medium and the central radio AGN.