Limits to Rest-frame Ultraviolet Emission from Far-infrared-luminous z ≃ 6 Quasar Hosts-猫眼课题宝

DOI：

10.3847/1538-4357/abaa4c

发表时间：

2020-07

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

M. Marshall;M. Mechtley;R. Windhorst;S. Cohen;R. Jansen;Linhua Jiang;V. Jones;J. Wyithe;Xiaohui Fan;N. Hathi;K. Jahnke;W. Keel;A. Koekemoer;V. Marian;Keven Ren;J. Robinson;H. Rottgering;R. Ryan;E. Scannapieco;D. Schneider;G. Schneider;Brent M. Smith;Haojing Yan

我们报告了哈勃太空望远镜对5个远红外发光z = 6.6类星体和z = 5.85无热尘类星体SDSS J 0005 -0006的宿主星系的静止帧紫外辐射的搜索。我们使用马尔可夫链蒙特卡罗估计器对每个类星体进行2D表面亮度建模，同时拟合和减去类星体点源，以约束潜在的宿主星系发射。我们测量了mJ > 22.7等和mH > 22.4等的类星体宿主星系的上限，对应于M* < 2 × 1011 M *。这些恒星质量极限与局部MBH − M* 关系相一致。我们的流量限制是一致的预测的紫外线恒星种群的z 106主机星系，但可能在存在显着的尘埃（mag）。我们还探测到总共多达9个潜在的z 6类星体伴星系围绕着6个类星体中的5个，与类星体的距离为1.“4-3.”2，或8. 4 - 19. 4 kpc，它们可能与类星体宿主相互作用。这些邻近的伴星系的紫外绝对星等为−22.1至−19.9等，紫外光谱斜率β为−2.0至−0.2，与z = 6的发光恒星形成星系一致。这些结果表明，类星体是在明亮的z106星系典型的稠密环境中。然而，我们不能排除其中一些同伴是前景闯入者的可能性。詹姆斯·韦伯太空望远镜的红外观测将需要探测z 106类星体的宿主星系，并更好地限制它们的恒星质量和尘埃含量。

We report on a Hubble Space Telescope search for rest-frame ultraviolet emission from the host galaxies of five far-infrared-luminous z ≃ 6 quasars and the z = 5.85 hot-dust-free quasar SDSS J0005–0006. We perform 2D surface brightness modeling for each quasar using a Markov Chain Monte Carlo estimator, to simultaneously fit and subtract the quasar point source in order to constrain the underlying host galaxy emission. We measure upper limits for the quasar host galaxies of mJ > 22.7 mag and mH > 22.4 mag, corresponding to stellar masses of M* < 2 × 1011M⊙. These stellar mass limits are consistent with the local MBH − M* relation. Our flux limits are consistent with those predicted for the UV stellar populations of z ≃ 6 host galaxies, but likely in the presence of significant dust ( mag). We also detect a total of up to nine potential z ≃ 6 quasar companion galaxies surrounding five of the six quasars, separated from the quasars by 1.″4–3.″2, or 8.4–19.4 kpc, which may be interacting with the quasar hosts. These nearby companion galaxies have UV absolute magnitudes of −22.1 to −19.9 mag and UV spectral slopes β of −2.0 to −0.2, consistent with luminous star-forming galaxies at z ≃ 6. These results suggest that the quasars are in dense environments typical of luminous z ≃ 6 galaxies. However, we cannot rule out the possibility that some of these companions are foreground interlopers. Infrared observations with the James Webb Space Telescope will be needed to detect the z ≃ 6 quasar host galaxies and better constrain their stellar mass and dust content.

Limits to Rest-frame Ultraviolet Emission from Far-infrared-luminous z ≃ 6 Quasar Hosts

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