We present millimeter observations of the host galaxy of the most distant blazar known, VLASS J041009.05−013919.88 (hereafter J0410–0139) at z = 7, using Atacama Large Millimeter/submillimeter Array (ALMA) and NOrthern Extended Millimeter Array (NOEMA) observations. The ALMA data reveal a (2.02 ± 0.36) × 1042 erg s−1 [C ii] 158 μm emission line at z = 6.9964 with a [C ii]-inferred star formation rate (SFR) of 58 ± 9 M⊙ yr−1. We estimate a dynamical mass of Mdyn,[C ii] = (4.6 ± 2.0) × 109M⊙, implying a black hole mass to host a dynamical mass ratio of . The 238 GHz continuum (rest-frame IR) decreased by ∼33% from the NOEMA to the ALMA observations taken ∼10 months apart. The Very Large Array 3–10 GHz radio flux densities showed a ∼37% decrease in a similar time frame, suggesting a causal connection. At face value, J0410–0139 would have the lowest [C ii]-to-IR luminosity ratio of a z > 5.7 quasar reported to date (∼10−4). However, if only <20% of the measured IR luminosity was due to thermal emission from dust, the [C ii]-to-IR luminosity ratio would be typical of (U)LIRGs, and the SFRs derived from [C ii] and IR luminosities would be consistent. These results provide further evidence that synchrotron emission significantly contributes to the observed rest-frame IR emission of J0410–0139, similar to what has been reported in some radio-loud active galactic nuclei at z < 1.

中文翻译：

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[C ii]z = 7 Blazar 的性质和远红外可变性


我们展示了使用阿塔卡马大型毫米/亚毫米阵列 （ALMA） 和 NOrthern 扩展毫米阵列 （NOEMA） 观测，对已知最遥远的布拉扎星系的宿主星系 VLASS J041009.05-013919.88（以下简称 J0410-0139）在 z = 7 处的毫米观测。ALMA 数据显示，在 z = 6.9964 处有一条 （2.02 ± 0.36） × 1042 erg s−1 [C ii] 158 μm 发射线，[C ii] 推断的恒星形成速率 （SFR） 为 58 ± 9 M⊙ yr-1。我们估计 Mdyn 的动力学质量，[C ii] = （4.6 ± 2.0） × 109M⊙，这意味着黑洞质量承载的动力学质量比为 。从 NOEMA 到 ALMA 观测间隔 ∼10 个月，238 GHz 连续谱（静止帧 IR）下降了 ∼33%。甚大阵列 3-10 GHz 无线电通量密度在类似的时间范围内显示出 ∼37% 的下降，这表明存在因果关系。从表面上看，J0410-0139 将具有迄今为止报道的 z > 5.7 类星体的最低 [C ii] 与 IR 光度比 （∼10-4）。然而，如果测得的红外光度中只有 <20% 是由于尘埃的热发射造成的，则 [C ii] 与 IR 光度之比将是 （U）LIRG 的典型值，并且从 [C ii] 和红外光度得出的 SFR 将是一致的。这些结果提供了进一步的证据，即同步辐射对观察到的 J0410-0139 的静止帧红外发射有显著贡献，类似于在 z < 1 处一些射电响亮的活跃星系核中报道的情况。