论文标题
低频无线电连续成像和11个LIRG的SED建模：仅无线电和FUV到无线电频段
Low frequency radio continuum imaging and SED modeling of 11 LIRGs: radio-only and FUV to radio bands
论文作者
论文摘要
我们介绍了从紫外线到广播到无线电（$ \ sim $ 70 MHz至$ \ sim $ 15 GHz）的11个本地发光红外星系（LIRGS）的详细分析。我们通过使用调查星系发射（CIGALE）和超大代码的代码建模来得出天体物理特性（SED）。无线电SED包括GMRT的325和610 MHz的新观察以及公共档案馆的测量结果。 Our main results are (1) radio SEDs show turnovers and bends, (2) the synchrotron spectral index of the fitted radio spectra ranges between $-$0.5 and $-$1.7, and (3) the infrared luminosity, dust mass, dust temperature, stellar mass, star-formation rates (SFRs) and AGN fraction obtained from CIGALE falls in the range exhibited by galaxies of the same class. 60 $ $ M红外的比率和1.4 GHz无线电发光度，1.4 GHz热量分数和发射度量范围在2.1和2.9，0.1％和10％，0.02和269.5 $ \ times $ 10 $^{6} $ cm $ cm $ cm $^{-6} $ PC之间。我们得出的结论是，无线电SED中看到的失误是由于免费吸收而引起的。这是由CIGALE分析得出的低AGN分数支持的。分解的1.4 GHz热和非热无线电亮度使我们能够使用缩放关系计算恒星形成率（SFR）。观察到10 Myr Ago（与100 MYR AGO）获得的SFR $ _ {ir} $之间观察到正相关，因为预计在这些星系中观察到的典型磁场强度（$ \ $ \ $ 50 $ 5 $ g），预计相似的同步寿命是相似的同步寿命。
We present the detailed analysis of 11 local luminous infrared galaxies (LIRGs) from ultraviolet through far-infrared to radio ($\sim$70 MHz to $\sim$15 GHz) bands. We derive the astrophysical properties through spectral energy distribution (SED) modeling using the Code Investigating GALaxy Emission (CIGALE) and UltraNest codes. The radio SEDs include our new observations at 325 and 610 MHz from the GMRT and the measurements from public archives. Our main results are (1) radio SEDs show turnovers and bends, (2) the synchrotron spectral index of the fitted radio spectra ranges between $-$0.5 and $-$1.7, and (3) the infrared luminosity, dust mass, dust temperature, stellar mass, star-formation rates (SFRs) and AGN fraction obtained from CIGALE falls in the range exhibited by galaxies of the same class. The ratio of 60$μ$m infrared and 1.4 GHz radio luminosity, the 1.4 GHz thermal fraction, and emission measure range between 2.1 and 2.9, 0.1% and 10%, 0.02 and 269.5$\times$10$^{6}$ cm$^{-6}$ pc, respectively. We conclude that the turnovers seen in the radio SEDs are due to free-free absorption; this is supported by the low AGN fraction derived from the CIGALE analysis. The decomposed 1.4 GHz thermal and nonthermal radio luminosities allowed us to compute the star formation rate (SFR) using scaling relations. A positive correlation is observed between the SFR$_{IR}$ obtained 10 Myr ago (compared to 100 Myr ago) and 1.4 GHz radio (total and nonthermal) because similar synchrotron lifetimes are expected for typical magnetic field strengths observed in these galaxies ($\approx$50$μ$G).
