Mid-Infrared spectroscopic properties of ultra-luminous infrared quasars

被引:20
作者
Cao, Chen [1 ,2 ,3 ]
Xia, X. Y. [4 ]
Wu, Hong [2 ]
Mao, S. [4 ,5 ]
Hao, C. N. [4 ,6 ]
Deng, Z. G. [2 ,3 ,4 ]
机构
[1] Shandong Univ, Sch Space Sci & Phys, Weihai 264209, Shandong, Peoples R China
[2] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
[3] Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China
[4] Tianjin Normal Univ, Tianjin Astrophys Ctr, Tianjin 300384, Peoples R China
[5] Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England
[6] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
基金
英国科学技术设施理事会;
关键词
galaxies: active; galaxies: evolution; galaxies: interactions; quasars: general; infrared: galaxies;
D O I
10.1111/j.1365-2966.2008.13747.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We analyse mid-infrared (MIR) spectroscopic properties for 19 ultra-luminous infrared quasars (IR QSOs) in the local Universe based on the spectra from the IR Spectrograph on board the Spitzer Space Telescope. The MIR properties of IR QSOs are compared with those of optically selected Palomar-Green QSOs (PG QSOs) and ultra-luminous infrared galaxies (ULIRGs). The average MIR spectral features from similar to 5 to 30 mu m, including the spectral slopes, 6.2 mu m polycyclic aromatic hydrocarbon (PAH) emission strengths and [NeII] 12.81 mu m luminosities of IR QSOs, differ from those of PG QSOs. In contrast, IR QSOs and ULIRGs have comparable PAH and [NeII] luminosities. These results are consistent with IR QSOs being at a transitional stage from ULIRGs to classical QSOs. We also find that the colour index alpha(30, 15) is a good indicator of the relative contribution of starbursts to active galactic nuclei (AGNs) for all QSOs. Correlations between the [NeII] 12.81 mu m and PAH 6.2 mu m luminosities and those between the [NeII], PAH with 60 mu m luminosities for ULIRGs and IR QSOs indicate that both [NeII] and PAH luminosities are approximate star-formation rate indicators for IR QSOs and starburst-dominated galaxies; the scatters are, however, quite large (similar to 0.7-0.8 dex). Finally, the correlation between the equivalent widths (EW; PAH 6.2 mu m) and outflow velocities suggests that star-formation activities are suppressed by feedback from AGNs and/or supernovae.
引用
收藏
页码:336 / 348
页数:13
相关论文
共 67 条
[21]   The nature of associated absorption and the ultraviolet-X-ray connection in 3C 288.1 [J].
Hamann, FW ;
Netzer, H ;
Shields, JC .
ASTROPHYSICAL JOURNAL, 2000, 536 (01) :101-111
[22]   Growth of black holes and their host spheroids in (sub)mm-loud high-redshift QSOs [J].
Hao, Cai-Na ;
Xia, Xiao-Yang ;
Mao, Shu-De ;
Deng, Zu-Gan ;
Wu, Hong .
CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS, 2008, 8 (01) :12-24
[23]   The physical connections among infrared QSOs, palomar-green QSOs, and narrow-line Seyfert 1 galaxies [J].
Hao, CN ;
Xia, XY ;
Mao, SD ;
Wu, H ;
Deng, ZG .
ASTROPHYSICAL JOURNAL, 2005, 625 (01) :78-88
[24]   The detection of silicate emission from quasars at 10 and 18 microns [J].
Hao, L ;
Spoon, HWW ;
Sloan, GC ;
Marshall, JA ;
Armus, L ;
Tielens, AGGM ;
Sargent, B ;
van Bemmel, IM ;
Charmandaris, V ;
Weedman, DW ;
Houck, JR .
ASTROPHYSICAL JOURNAL, 2005, 625 (02) :L75-L78
[25]   The distribution of silicate strength in Spitzer spectra of AGNs and ULIRGs [J].
Hao, Lei ;
Weedman, D. W. ;
Spoon, H. W. W. ;
Marshall, J. A. ;
Levenson, N. A. ;
Elitzur, M. ;
Houck, J. R. .
ASTROPHYSICAL JOURNAL, 2007, 655 (02) :L77-L80
[26]   Present-day growth of black holes and bulges: The Sloan Digital Sky Survey perspective [J].
Heckman, TM ;
Kauffmann, G ;
Brinchmann, J ;
Charlot, P ;
Tremonti, C ;
White, SDM .
ASTROPHYSICAL JOURNAL, 2004, 613 (01) :109-118
[27]   The SMART data analysis package for the infrared spectrograph on the Spitzer Space Telescope [J].
Higdon, SJU ;
Devost, D ;
Higdon, JL ;
Brandl, BR ;
Houck, JR ;
Hall, P ;
Barry, D ;
Charmandaris, V ;
Smith, JDT ;
Sloan, GC ;
Green, J .
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 2004, 116 (824) :975-984
[28]   [O II] emission in quasar host galaxies: Evidence for a suppressed star formation efficiency [J].
Ho, LC .
ASTROPHYSICAL JOURNAL, 2005, 629 (02) :680-685
[29]   The mid-infrared fine-structure lines of neon as an indicator of star formation rate in galaxies [J].
Ho, Luis C. ;
Keto, Eric .
ASTROPHYSICAL JOURNAL, 2007, 658 (01) :314-318
[30]  
Houck JR, 2004, ASTROPHYS J SUPPL S, V154, P18, DOI 10.1086/423134