Compact Steep Spectrum Radio Sources with Enhanced Star Formation Are Smaller Than 10 kpc
Compact Steep Spectrum Radio Sources with Enhanced Star Formation Are Smaller Than 10 kpc
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DOI：
10.3847/2041-8213/accf0a
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发表时间：
2023-04
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影响因子：
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通讯作者：
Y. Gordon;C. O’Dea;S. Baum;K. Bechtol;C. Duggal;P. Ferguson
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作者：
Y. Gordon;C. O’Dea;S. Baum;K. Bechtol;C. Duggal;P. Ferguson
致密陡谱（CSS）射电源是活动星系核（AGN），其射电喷流仅在星系尺度上传播，定义为投影线性尺寸（LS）高达20 kpc。CSS源通常由大质量的早期型星系托管，几乎没有正在形成的星星;然而，一小部分已知具有增强的星星形成。使用来自20厘米射电天空微弱图像巡天、甚大阵列巡天和斯隆数字巡天的档案数据，我们确定了z 1024 W Hz−1的166个CSS源的体积有限样本。比较这些CSS源的星星形成率和线性尺寸，我们发现，有14%的CSS源的特定星星形成率高于0.01 Gyr−1，LS < 10 kpc。我们讨论了驱动这一结果的可能机制，得出的结论是，它很可能是多余的星星形成在这些来源发生在多次爆发，并停止之前的活动星系核喷流被触发。
Compact steep spectrum (CSS) radio sources are active galactic nuclei (AGN) that have radio jets propagating only on galactic scales, defined as having projected linear size (LS) of up to 20 kpc. CSS sources are generally hosted by massive early-type galaxies with little ongoing star formation; however, a small fraction are known to have enhanced star formation. Using archival data from the Faint Images of the Radio Sky at Twenty cm survey, the Very Large Array Sky Survey, and the Sloan Digital Sky Survey, we identify a volume-limited sample of 166 CSS sources at z 1024 W Hz−1. Comparing the star formation rates and linear sizes of these CSS sources, we find that the ≈14% of CSS sources with specific star formation rates above 0.01 Gyr−1 all have LS < 10 kpc. We discuss the possible mechanisms driving this result, concluding that it is likely the excess star formation in these sources occurred in multiple bursts and ceased prior to the AGN jet being triggered.