Monitoring of active galactic nuclei. I. The quasars 1302-102 and 1217+023
1992 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 262, no 1, 17-2525 p.Article in journal (Refereed) Published
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
Place, publisher, year, edition, pages
1992. Vol. 262, no 1, 17-2525 p.
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
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:uu:diva-197174ISI: 4249888OAI: oai:DiVA.org:uu-197174DiVA: diva2:611949