期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 434, 期 4, 页码 3104-3121出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt1228
关键词
surveys - galaxies: evolution; quasars: general
资金
- NASA Chandra grant [G07-8136A]
- Italian Space Agency (ASI) [ASI-INAF I/088/06/0, I/009/10/0]
- German Deutsche Forschungsgemeinschaft, DFG Leibniz Prize [FKZ HA 1850/28-1]
- Swiss National Science Foundation [PP00P2_138979/1]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0908044] Funding Source: National Science Foundation
We define a quasar-galaxy mixing diagram using the slopes of their spectral energy distributions (SEDs) from 1 mu m to 3000 A and from 1 to 3 mu m in the rest frame. The mixing diagram can easily distinguish among quasar-dominated, galaxy-dominated and reddening-dominated SED shapes. By studying the position of the 413 XMM-selected type 1 AGN in the wide-field 'Cosmic Evolution Survey' in the mixing diagram, we find that a combination of the Elvis et al. mean quasar SED with various contributions from galaxy emission and some dust reddening is remarkably effective in describing the SED shape from 0.3 to 3 mu m for large ranges of redshift, luminosity, black hole mass and Eddington ratio of type 1 AGN. In particular, the location in the mixing diagram of the highest luminosity AGN is very close (within 1 Sigma) to that of the Elvis et al. SED template. The mixing diagram can also be used to estimate the host galaxy fraction and reddening in quasar. We also show examples of some outliers which might be AGN in different evolutionary stages compared to the majority of AGN in the quasar-host galaxy co-evolution cycle.
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