标题： 10的8次方太阳质量黑洞宿主星系在红移6时的恒星形成率和动力学质量 显示英文标题

标题： Star formation rate and dynamical mass of 10^8 solar mass black hole host galaxies at redshift 6

摘要： 我们呈现ALMA对两个中等光度类星体在红移6的观测结果。 这些类星体来自加拿大-法国高红移类星体调查（CFHQS），其黑洞质量约为10^8 M_solar。 这两个类星体均在[CII]线和尘埃连续谱中被探测到。 结合这些数据与我们之前对两个类似CFHQS类星体的研究，我们探讨了群体特性。 我们表明，z>6类星体的远红外光度显著低于低红移处与光度匹配的样本，推断出较低的恒星形成率，这可能与z=6时较低的黑洞质量有关。 CFHQS类星体的[CII]与远红外光度比值与本地宇宙中具有相似恒星形成率的星暴星系相当。 我们根据[CII]数据确定了类星体宿主星系的速度弥散和动力学质量。 我们发现，它们没有显著偏离由具有相似黑洞质量的邻近星系定义的关系。 然而，在z=6时，离散度有明显增加，超出大的观测不确定性。 显示英文摘要

摘要： We present ALMA observations of two moderate luminosity quasars at redshift 6. These quasars from the Canada-France High-z Quasar Survey (CFHQS) have black hole masses of ~10^8 M_solar. Both quasars are detected in the [CII] line and dust continuum. Combining these data with our previous study of two similar CFHQS quasars we investigate the population properties. We show that z>6 quasars have a significantly lower far-infrared luminosity than bolometric-luminosity-matched samples at lower redshift, inferring a lower star formation rate, possibly correlated with the lower black hole masses at z=6. The ratios of [CII] to far-infrared luminosities in the CFHQS quasars are comparable with those of starbursts of similar star formation rate in the local universe. We determine values of velocity dispersion and dynamical mass for the quasar host galaxies based on the [CII] data. We find that there is no significant offset from the relations defined by nearby galaxies with similar black hole masses. There is however a marked increase in the scatter at z=6, beyond the large observational uncertainties.