arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2201.07349astro-ph.GA
收藏

明亮、重遮蔽WISE-NVSS类星体的射电谱

Radio Spectra of Luminous, Heavily Obscured WISE-NVSS Selected Quasars

Pallavi Patil, Mark Whittle, Kristina Nyland, Carol Lonsdale, Mark Lacy, Amy E. Kimball, Colin Lonsdale, Wendy Peters, Tracy E. Clarke, Andreas Efstathiou, Simo… 展开作者

Pallavi Patil, Mark Whittle, Kristina Nyland, Carol Lonsdale, Mark Lacy, Amy E. Kimball, Colin Lonsdale, Wendy Peters, Tracy E. Clarke, Andreas Efstathiou, Simona Giacintucci, Minjin Kim, Lauranne Lanz, Dipanjan Mukherjee, Emil Polisensky

摘要:

我们提出了无线电频谱跨越$0.1 - 10$ GHz的样本严重模糊的发光类星体,具有极红的中红外光学颜色和紧凑的无线电发射。频谱是根据目标10 GHz观测和档案无线电勘测数据构建的,这些数据共同产生每个物体的$6-11$通量密度测量值。我们用于无线电频谱建模的Python工具套件在Github上公开提供。我们的主要结果是,大多数(61%)的样本有峰值或弯曲的无线电频谱,许多(36%)可以归类为千兆赫兹峰值频谱(GPS)源。这表明致密的发射区可能是由最近触发的射电喷流引起的。假设同步自吸收(SSA)产生的峰值,我们推断紧凑的源大小($3 - 100$ PC)与强磁场($6 - 100$ MG)和年轻的年龄($30 - 10^4$年)。相反,自由-自由吸收(FFA)也可能由于与样品的深度嵌入性质相关的高柱密度而产生峰。然而,我们发现没有相关性之间的存在或频率的峰值和任何参数的MIR发射。高频光谱指数是陡峭的($α\approx -1$)和相关性,弱,与MIR光子能量密度的比率磁能密度,这表明光谱陡峭可能会产生从逆康普顿散射的强烈的MIR光子场。这项研究提供了一个基础,结合多频率和混合分辨率的无线电调查数据,了解年轻的无线电喷流的ISM和恒星形成率的主机星系的影响。

英文摘要:

We present radio spectra spanning $0.1 - 10$ GHz for the sample of heavily obscured luminous quasars with extremely red mid-infrared-optical colors and compact radio emission. The spectra are constructed from targeted 10 GHz observations and archival radio survey data, which together yield $6-11$ flux density measurements for each object. Our suite of Python tools for modeling the radio spectra is publicly available on Github. Our primary result is that most (61%) of the sample have peaked or curved radio spectra and many (36%) could be classified as Gigahertz Peaked Spectrum (GPS) sources. This indicates compact emission regions likely arising from recently triggered radio jets. Assuming synchrotron self-absorption (SSA) generates the peaks, we infer compact source sizes ($3 - 100$ pc) with strong magnetic fields ($6 - 100$ mG) and young ages ($30 - 10^4$ years). Conversely, free-free absorption (FFA) could also create peaks due to the high column densities associated with the deeply embedded nature of the sample. However, we find no correlations between the existence or frequency of the peaks and any parameters of the MIR emission. The high-frequency spectral indices are steep ($α\approx -1$) and correlate, weakly, with the ratio of MIR photon energy density to magnetic energy density, suggesting that the spectral steepening could arise from inverse Compton scattering off the intense MIR photon field. This study provides a foundation for combining multi-frequency and mixed-resolution radio survey data for understanding the impact of young radio jets on the ISM and star formation rates of their host galaxies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑