Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...19310705w&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #107.05; Bulletin of the American Astronomical Society, Vol. 30, p.1411
Astronomy and Astrophysics
Astronomy
Scientific paper
The UV to soft X-rays of luminous AGNs dominate their bolometric luminosity, driven by an accretion-powered dynamo at the center. These photons illuminate the surrounding gas, providing clues to fueling and exhaust. Two sets of important relationships -- neither of them understood -- link the continuum and gas properties. These are the Baldwin relations between equivalent width and luminosity, and the so-called `Eigenvector 1' relationships linking steeper X-ray spectra with narrower BLR Hβ and stronger Fe II (optical), and weaker NLR [O III]lambda 5007 emission (Boroson & Green 1992, Laor et al. 1994, 1997). These relationships plausibly link the central engine with structure, dynamics and physical conditions in sub-parsec to Kiloparsec scale gas. In order to investigate these relationships further we study the links between optical and ultraviolet emission lines, and the UV and soft-X-ray ionizing continuum. We have obtained HST UV and McDonald ground-based spectra for a unique sample -- a complete sample of PG QSOs chosen for low redshift and low Galactic reddening by Laor et al. (1994) in order to obtain high-quality information on the ionizing continuum. We show that the above eigenvector 1 relationships extend to many properties of the UV spectrum. We present examples of the new set of correlations, and speculate that a starburst origin for a component of QSO gas might explain its geometry, abundances and density. The link with dynamics and UV--X-ray SED suggests that this gas is fueling the accretion-driven central engine.
Brotherton Michael S.
Ferland Gary J.
Laor Ari
Shang Zhaohui
Wilkes Belinda J.
No associations
LandOfFree
The PG X-ray QSO Sample: Ionizing Continuum and Properties of the Fueling Gas does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The PG X-ray QSO Sample: Ionizing Continuum and Properties of the Fueling Gas, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The PG X-ray QSO Sample: Ionizing Continuum and Properties of the Fueling Gas will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-997761