http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Storrie-Lombardi, L. J. (검색결과 1 건)
- 무료
- 기관 내 무료
- 유료
-
SPECTROSCOPICALLY SELECTED<i>SPITZER</i>24<i>μm</i>ACTIVE GALACTIC NUCLEI
Choi, P. I.,Yan, Lin,Helou, G.,Storrie-Lombardi, L. J.,Fadda, D.,Im, M.,Shim, H. IOP Publishing 2011 The Astrophysical journal Vol.732 No.1
<P>We investigate the active galactic nucleus (AGN) sub-population of a 24 mu m flux-limited galaxy sample in the Spitzer Extragalactic First Look Survey. Using deep Keck optical spectroscopy and a series of emission-line diagnostics, we identify AGN-dominated systems over broad redshift 0 < z < 3.5 and luminosity 9 < log(L-TIR) < 14 ranges, with sample means of < z > = 0.85 and < log(LTIR)> = 11.5. We find that down to the flux limits of our Spitzer MIPS sample (f(24) > 200 mu Jy), 15%-20% of sources exhibit strong AGN signatures in their optical spectra. At this flux limit, the AGN population accounts for as much as 25%-30% of the integrated 24 mu m flux. This corresponds to an MIR AGN contribution approximate to 2-3x greater than that found in ISOCAM 15 mu m studies that used X-ray AGN identifications. Based on our spectroscopically selected AGN sample, we also investigate the merits of Infrared Array Camera (IRAC) color selection for AGN identification. Our comparison reveals that although there is considerable overlap, a significant fraction of spectroscopic AGNs are not identifiable based on their MIR colors alone. Both the measured completeness and reliability of the IRAC color selections are found to be strongly dependent on the MIR flux limit. Finally, our spectroscopic AGN sample implies as much as a 3x higher AGN surface density at high redshift (z > 1.2) than that of recent optical surveys at comparable optical flux limits, suggestive of a population of heavily obscured, optical/UV reddened AGNs.</P>
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
