Obscured AGN enhancement in galaxy pairs at cosmic noon: evidence from a probabilistic treatment of photometric redshifts
Obscured AGN enhancement in galaxy pairs at cosmic noon: evidence from a probabilistic treatment of photometric redshifts
复制标题
宇宙正午星系对中模糊的活动星系核增强：光度红移概率处理的证据
DOI：
10.1093/mnras/stad1300
复制
发表时间：
2024
影响因子：
4.8
通讯作者：
Dougherty S
中科院分区：
文献类型：
--
作者：
Dougherty S
Observations of the nearby universe reveal an increasing fraction of active galactic nuclei (AGNs) with decreasing projected separation for close galaxy pairs, relative to control galaxies. This implies galaxy interactions play a role in enhancing AGN activity. However, the picture at higher redshift is less established, partly due to limited spectroscopic redshifts. We combine spectroscopic surveys with photometric redshift probability distribution functions for galaxies in the CANDELS and COSMOS surveys, to produce the largest ever sample of galaxy pairs used in an AGN fraction calculation for cosmic noon (0.5 <z< 3). We present a new technique for assessing galaxy pair probability (based on line-of-sight velocities ±1000 km s−1) from photometric redshift posterior convolutions and use these to produce weighted AGN fractions. Over projected separations 5–100 kpc, we find no evidence for enhancement, relative to isolated control galaxies, of X-ray (LX> 1042erg s−1) or infrared-selected AGN in major (mass ratios up to 4:1) or minor (4:1 to 10:1) galaxy pairs. However, defining the most obscured AGN as those detected in the infrared but not in X-rays, we observe a trend of increasing obscured AGN enhancement at decreasing separations. The peak enhancement, relative to isolated controls, is a factor of 2.08 ± 0.61 for separations <25 kpc. Our simulations with mock data, indicates this could be a lower limit of the true enhancement. If confirmed with improved infrared imaging (e.g. withJWST) and redshifts (e.g. with forthcoming multi-object spectrograph surveys), this would suggest that galaxy interactions play a role in enhancing the most obscured black hole growth at cosmic noon.
伟大天文台起源深度调查（GOODS）验证观测
DOI：
--
发表时间：
2003
期刊：
影响因子：
--
作者：
M. Dickinson;J. Bergeron;S. Casertano;C. Cesarsky;R. Chary;S. Cristiani;P. Eisenhardt;D. Elbaz;R. Elston;S. M. Fall;H. Ferguson;R. Fosbury;R. Giacconi;M. Giavalisco;N. Grogin;M. Hauser;R. Hanisch;R. Hook;Inger JaRgensen;A. Koekemoer;M. Ledlow;M. Livio;B. Mobasher;P. Padovani;C. Papovich;J. Primack;B. Rauscher;W. Reach;A. Renzini;M. Rieke;P. Rosati;K. Roth;E. Schreier;D. Stern;M. Stiavelli;M. Takamiya;E. Tollestrup;C. Urry;Robert E. Williams;C. Winge;E. Wright
通讯作者：
E. Wright