+ Visit NASA.gov + Contact NASA   + Home Collection > NASA  Author > Angelini, L.  Author > George, I. M.  Author > Hill, J.  Author > Mushotzky, R. F.  Author > Padgett, C. A.  NASA Center > Goddard Space Flight Center  Publication Year > 2001-2010 > 2008  Subject > A-C > Astronomy  Availability Options > Order From CASI > CD-ROM, DVD, Print  Item/Media Type > Conference Paper  Note: Start a new navigation search by selecting a link above     Previous Record | Next Record + Back to Results   + Printer Friendly Title: Mini-Survey Of SDSS of [OIII] AGN With Swift Author(s): Angelini, L.; George, I. M.; Hill, J.; Padgett, C. A.; Mushotzky, R. F. Abstract: The number of AGN and their luminosity distribution are crucial parameters for our understanding of the AGN phenomenon. Recent work (e.g. Ferrarese and Merritt 2000) strongly suggests every massive galaxy has a central black hole. However, most of these objects either are not radiating or have been very difficult to detect. We are now in the era of large surveys, and the luminosity function (LF) of AGN has been estimated in various ways. In the X-ray band, Chandra and XMM surveys (e.g., Barger et al. 2005; Hasinger, et al. 2005) have revealed that the LF of Hard X-ray selected AGN shows a strong luminosity-dependent evolution with a dramatic break towards low L(x) (at al z). This is seen for all types of AGN, but is stronger for the broad-line objects (e.g., Steffen et al. 2004). In sharp contrast, the local LF of optically-selected samples shows no such break and no differences between narrow and broad-line objects (Hao et al. 2005). If, as been suggested, hard X-ray and optical emission line can both be fair indicators of AGN activity, it is important to first understand how reliable these characteristics are if we hope to understand the apparent discrepancy in the LFs. NASA Center: Goddard Space Flight Center Publication Date: March 31, 2008 Document Source: CASI No Digital Version Available: Go to Tips On Ordering Document ID: 20080045745 Publication Information: Number of Pages = 1 Price Code: A01 Meeting Information: HEAD 2008, 31 Mar. - 3 Apr. 2008, Los Angeles, CA., United States Keywords: SKY SURVEYS (ASTRONOMY); PULSE COMMUNICATION; GAMMA RAY BURSTS; ACTIVE GALACTIC NUCLEI; SWIFT OBSERVATORY; LUMINOSITY; XMM-NEWTON TELESCOPE; CALIBRATING; X RAY OPTICS; DETECTION; LIGHT EMISSION; Accessibility: Unclassified; Copyright; Unlimited; Publicly available; Updated/Added to NTRS: 2008-12-09 + Back to Top + Sponsored by the NASA Scientific and Technical    Information Program + 2004 Vision for Space Exploration + Freedom of Information Act + NASA Web Privacy Policy and Important Notices + NASA Disclaimers, Copyright Notice,    and Terms and Conditions of Use NASA Official: Calvin Mackey Page Curator: NASA Center for AeroSpace Information (help@sti.nasa.gov) Last Updated: July 5, 2007