SPECTRAL VARIABILITY OF FIRST BRIGHT QSOs WITH SLOAN DIGITAL SKY SURVEY OBSERVATIONS

被引：17

作者：

Bian, Wei-Hao ^{[1
,2
,3
]}

Zhang, Li ^{[1
,2
]}

Green, Richard ^{[3
]}

Hu, Chen ^{[4
]}

机构：

[1] Nanjing Normal Univ, Dept Phys, Nanjing 210097, Jiangsu, Peoples R China

[2] Nanjing Normal Univ, Inst Theoret Phys, Nanjing 210097, Jiangsu, Peoples R China

[3] LBT Observ, Tucson, AZ 85721 USA

[4] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100039, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2012年 / 759卷 / 02期

关键词：

galaxies: active; quasars: general; techniques: spectroscopic; EMISSION-LINE PROPERTIES; ACTIVE GALACTIC NUCLEI; BLACK-HOLE MASS; FE II EMISSION; OPTICAL VARIABILITY; X-RAY; DATA RELEASE; QUASARS; LUMINOSITY; REDSHIFT;

D O I：

10.1088/0004-637X/759/2/88

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

For some samples, it has been shown that spectra of QSOs with low redshift are bluer during their brighter phases. For the FIRST bright QSO sample, we assemble their spectra from Sloan Digital Sky Survey Data Release 7 (SDSS DR7) to investigate variability between the spectra from White et al. and from the SDSS for a long rest-frame time lag, up to 10 years. There are 312 radio-loud (RL) QSOs and 232 radio-quiet (RQ) QSOs in this sample, up to z similar to 3.5. With two-epoch variation, it is found that the spectra of half of the QSOs appear redder during their brighter phases. There is no obvious difference in slope variability between subsamples of RQ and RL QSOs. This result implies that the presence of a radio jet does not affect the slope variability on 10 year timescales. The arithmetic composite difference spectrum for variable QSOs is steep blueward of similar to 2500 angstrom. The variability for the region blueward of 2500 angstrom is different to that for the region redward of 2500 angstrom.

引用

页数：9

共 40 条

[1] THE SEVENTH DATA RELEASE OF THE SLOAN DIGITAL SKY SURVEY [J].

Abazajian, Kevork N. ;

Adelman-McCarthy, Jennifer K. ;

Agueros, Marcel A. ;

Allam, Sahar S. ;

Prieto, Carlos Allende ;

An, Deokkeun ;

Anderson, Kurt S. J. ;

Anderson, Scott F. ;

Annis, James ;

Bahcall, Neta A. ;

Bailer-Jones, C. A. L. ;

Barentine, J. C. ;

Bassett, Bruce A. ;

Becker, Andrew C. ;

Beers, Timothy C. ;

Bell, Eric F. ;

Belokurov, Vasily ;

Berlind, Andreas A. ;

Berman, Eileen F. ;

Bernardi, Mariangela ;

Bickerton, Steven J. ;

Bizyaev, Dmitry ;

Blakeslee, John P. ;

Blanton, Michael R. ;

Bochanski, John J. ;

Boroski, William N. ;

Brewington, Howard J. ;

Brinchmann, Jarle ;

Brinkmann, J. ;

Brunner, Robert J. ;

Budavari, Tamas ;

Carey, Larry N. ;

Carliles, Samuel ;

Carr, Michael A. ;

Castander, Francisco J. ;

Cinabro, David ;

Connolly, A. J. ;

Csabai, Istvan ;

Cunha, Carlos E. ;

Czarapata, Paul C. ;

Davenport, James R. A. ;

de Haas, Ernst ;

Dilday, Ben ;

Doi, Mamoru ;

Eisenstein, Daniel J. ;

Evans, Michael L. ;

Evans, N. W. ;

Fan, Xiaohui ;

Friedman, Scott D. ;

Frieman, Joshua A. .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2009, 182 (02) :543-558

[2] DEPENDENCE OF THE OPTICAL/ULTRAVIOLET VARIABILITY ON THE EMISSION-LINE PROPERTIES AND EDDINGTON RATIO IN ACTIVE GALACTIC NUCLEI [J].

Ai, Y. L. ;

Yuan, W. ;

Zhou, H. Y. ;

Wang, T. G. ;

Dong, X. -B. ;

Wang, J. G. ;

Lu, H. L. .

ASTROPHYSICAL JOURNAL LETTERS, 2010, 716 (01) :L31-L35

[3] QUASAR OPTICAL VARIABILITY IN THE PALOMAR-QUEST SURVEY [J].

Bauer, Anne ;

Baltay, Charles ;

Coppi, Paolo ;

Ellman, Nancy ;

Jerke, Jonathan ;

Rabinowitz, David ;

Scalzo, Richard .

ASTROPHYSICAL JOURNAL, 2009, 696 (02) :1241-1256

[4] The ensemble photometric variability of ∼25,000 quasars in the Sloan Digital Sky Survey [J].

Berk, DEV ;

Wilhite, BC ;

Kron, RG ;

Anderson, SF ;

Brunner, RJ ;

Hall, PB ;

Ivezic, Z ;

Richards, GT ;

Schneider, DP ;

York, DG ;

Brinkmann, JV ;

Lamb, DQ ;

Nichol, RC ;

Schlegel, DJ .

ASTROPHYSICAL JOURNAL, 2004, 601 (02) :692-714

[5] Timescales of soft x-ray variability and physical constraints in active galactic nuclei [J].

Bian, W ;

Zhao, Y .

ASTROPHYSICAL JOURNAL, 2003, 591 (02) :733-740

[6] THE VARIABILITY OF OPTICAL Fe II EMISSION IN PG QSO 1700+518 [J].

Bian, Wei-Hao ;

Huang, Kai ;

Hu, Chen ;

Zhang, Li ;

Yuan, Qi-Rong ;

Huang, Ke-Liang ;

Wang, Jian-Min .

ASTROPHYSICAL JOURNAL, 2010, 718 (01) :460-466

[7] Accretion rates and the accretion efficiency in AGNs [J].

Bian, WH ;

Zhao, YH .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2003, 55 (03) :599-603

[8] Twelve years of X-ray and optical variability in the Seyfert galaxy NGC 4051 [J].

Breedt, E. ;

McHardy, I. M. ;

Arevalo, P. ;

Uttley, P. ;

Sergeev, S. G. ;

Minezaki, T. ;

Yoshii, Y. ;

Sakata, Y. ;

Lira, P. ;

Chesnok, N. G. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2010, 403 (02) :605-619

[9] THE RELATIONSHIP BETWEEN INFRARED, OPTICAL, AND ULTRAVIOLET EXTINCTION [J].

CARDELLI, JA ;

CLAYTON, GC ;

MATHIS, JS .

ASTROPHYSICAL JOURNAL, 1989, 345 (01) :245-256

[10] Structure function analysis of long-term quasar variability [J].

De Vries, WH ;

Becker, RH ;

White, RL ;

Loomis, C .

ASTRONOMICAL JOURNAL, 2005, 129 (02) :615-629

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