Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8264o&link_type=abstract
HST Proposal ID #8264
Physics
Hst Proposal Id #8264 Agn Physics
Scientific paper
To understand the nature of Active Galactic Nuclei {AGN}, it is important to explore the full range of parameter space occupied by these powerful objects. For 35 years, the most luminous, nearby AGN known was the radio-loud quasar, 3C 273 -- the first quasar ever discovered. Now, we have a newly discovered quasar, PDS 456, which our IR/optical/X-ray data suggests may be the most luminous object in the local Universe. PDS 456 is radio-quiet, and therefore provides a view of the nucleus relatively unaffected by the relativistic jet, which either dominates or contaminates the observed emission from 3C 273. We propose to use one orbit of HST time to obtain a moderate-resolution STIS spectrum of PDS 456 in order to: {a} better elucidate its spectral energy distribution, and in particular its big-blue-bump, thereby constraining AGN accretion disc models; {b} see if the close similarity with 3C 273 in the optical/IR extends into the UV; {c} search for UV absorption lines possibly associated with the strong Fe edge seen in the ASCA data, or with a broad absorption line region; and {d} determine the UV emission-line spectrum, particularly LyAlpha for comparison with the very broad Balmer and Paschen lines.
No associations
LandOfFree
PDS 456: A radio-quiet analogue of 3C 273 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 PDS 456: A radio-quiet analogue of 3C 273, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and PDS 456: A radio-quiet analogue of 3C 273 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-993026