Monitoring of active galactic nuclei. I. The quasars 1302-102 and 1217+023

• Presents the results of a five-month spectroscopic monitoring campaign of two radio-loud quasars PKS 1217+023 and PKS 1302-102. There is a pronounced lack of variability in 1302-102 apart from a possible small change in the continuum level near the end of the monitoring period, but 1217+023 underwent a 20% continuum decrease in the middle of the campaign. No line variability at all was observed. The co-added data represent two of the best spectra yet obtained of any radio-loud quasar other than 3C 273, and the shape of the Hbeta line and the presence underneath it of other contaminating lines are well determined. The Hbeta broad line in 1302-102 is redshifted by 3 Aring with respect to the narrow line region and there is evidence for a separate broad Hbeta feature on top of the main Hbeta emission in both quasars. This feature is stronger in 1217+023 than in 1302-102

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

Experimental/ astronomical spectra

galactic nuclei

quasars

red shift

spectral line breadth

visible astronomical observations/ H beta line relative redshift

AD 1990 01 02 to 06 04

QSOs broad-line regions geometry

Hbeta line profile

optical continuum variations

quasars optical spectra

quasar classification schemes

redshift 0.240

redshift 0.286

active galactic nuclei

spectroscopic monitoring campaign

radio-loud quasars

PKS 1217+023

PKS 1302-102

line variability

Hbeta broad line

narrow line region

separate broad Hbeta feature

main Hbeta emission

200 km/s

486.1 nm

476 to 660 nm/ A9870J Quasars A9580J Photographic region astronomical observations A9850H Red shift

distances

and spatial distribution of galaxies/ velocity 2.0E+05 m/s

wavelength 4.861E-07 m

wavelength 4.76E-07 to 6.6E-07 m

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)