Extreme BAL quasars from the Sloan Digital Sky Survey

Conference · Sun Jul 01 00:00:00 EDT 2001

OSTI ID:802890

Hall, Patrick B. ^[1]; Gunn, J. E. ^[1]; Knapp, G. R. ^[1]; Narayanan, V. K. ^[1]; Strauss, Michael A.  ^[1]; Anderson, S. F. ^[2]; Vanden Berk, D. E. ^[3]; Heckman, T. M. ^[4]; Krolik, J. H.  ^[4]; Tsvetanov, Z. I. ^[4]; Zheng, W. ^[4]; Richards, G. T.  ^[5]; Schneider, D. P. ^[5]; Fan, X. ^[6]; York, Donald G. ^[7]; Geballe, T. R. ^[8]; Davis, M. ^[9]; Becker, R. H. ^[10]; Brunner, R. J. ^[11]

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1. Princeton U. Observ.
2. Washington U., Seattle, Astron. Dept.
3. Fermilab
4. Johns Hopkins U.
5. Penn State U., Astron. Astrophys.
6. Princeton, Inst. Advanced Study
7. Chicago U., Astron. Astrophys. Ctr.
8. Gemini Observ., Hilo
9. UC, Berkeley, Astron. Dept.
10. LLNL, Livermore
11. Caltech

The Sloan Digital Sky Survey has discovered a population of broad absorption line quasars with various extreme properties. Many show absorption from metastable states of FeII with varying excitations: several objects are almost completely absorbed bluewards of MgII: at least one shows stronger absorption from FeIII than FeII, indicating temperatures T>35000 K in the absorbing region: and one object even seems to have broad H-beta absorption. Many of these extreme BALs are also heavily reddened, though `normal' BALs (particularly LoBALs) from SDSS also show evidence for internal reddening.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: SDSS
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 802890
• Report Number(s): FERMILAB-CONF-01-407-A; arXiv:astro-ph/0107182; oai:inspirehep.net:576033; TRN: US0206418
• Resource Relation: Other Information: PBD: 11 Oct 2002
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ABSORPTION
METASTABLE STATES
NUCLEI
QUASARS