论文标题
$ z $ 〜3
Cold Molecular Gas and Free-Free Emission from Hot, Dust-Obscured Galaxies at $z$~3
论文作者
论文摘要
我们报告了RedShifted Co（1-0）线排放的观察结果，并观察到了框架$ \ rm \ sim \ sim $ 30GHz无线电连续性发射，从五个超薄的中ir中IR中的精选热，尘埃刺激的星系（热狗）以$ z \ rm \ rm \ gtrsim $ 3，使用Karl G...jansky $ 3。我们在所有五只热狗中都检测到CO（1-0）线的发射，其中一只处于高信号到噪声。我们分析了Fir-Radio光谱能量分布，包括星系的灰尘，无灰尘和同步加速器发射。我们发现，115 GHz休息框连续体中的大多数主要是由于同步器或无自由发射所致，只有对热发射的潜在贡献可能很小。与高红移相比，与尘土飞扬的星系（DSFGS）和亚毫米级星系（SMG）相比，我们看到其余框架115 GHz连续发射的赤字，这表明热狗与星形星系相比没有相似的冷气储备。一个目标是W2305-0039，在第一次1.4 GHz调查中检测到，并且很可能具有紧凑的无线电飞机。我们与Fir-Radio的相关性进行比较，发现样品中至少有一半的热狗相对于正常星系是放射性的。这些发现表明，与较低的星系星系相比，热狗的冷分子气（$ z \ rm \ sim \ sim $ 2 $ 2红移）相当少，并且以功能强大但可射线优惠的AGN为主导。
We report on observations of redshifted CO(1-0) line emission and observed-frame $\rm\sim$ 30GHz radio continuum emission from five ultra-luminous, mid-IR selected hot, Dust-Obscured Galaxies (Hot DOGs) at $z\rm\gtrsim$ 3 using the Karl G. Jansky Very Large Array. We detect CO(1-0) line emission in all five Hot DOGs, with one of them at high signal to noise. We analyse FIR-radio spectral energy distributions, including dust, free-free and synchrotron emission for the galaxies. We find that most of the 115 GHz rest-frame continuum is mostly due to synchrotron or free-free emission, with only a potentially small contribution from thermal emission. We see a deficit in the rest-frame 115 GHz continuum emission compared to dusty star-forming galaxies (DSFGs) and sub-millimetre galaxies (SMGs) at high redshift, suggesting that Hot DOGs do not have similar cold gas reserves compared with star-forming galaxies. One target, W2305-0039, is detected in the FIRST 1.4 GHz survey, and is likely to possess compact radio jets. We compare to the FIR-radio correlation, and find that at least half of the Hot DOGs in our sample are radio-quiet with respect to normal galaxies. These findings suggest that Hot DOGs have comparably less cold molecular gas than star-forming galaxies at lower, $z\rm\sim$ 2 redshifts, and are dominated by powerful, yet radio-quiet AGN.
