Free-free absorber surrounding GHz-peaked spectrum sources

Details Free-free absorber surrounding GHz-peaked spectrum sources Free-free absorber surrounding GHz-peaked spectrum sources

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002newar..46..283s&link_type=abstract

New Astronomy Reviews, Volume 46, Issue 2-7, p. 283-285.

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We present multi-frequency observations towards GHz-Peaked Spectrum (GPS) sources with the VLBA. Recent VSOP observations of a GPS source OQ208 have shown that its convex spectrum is caused by free-free absorption (FFA) due to external ionized gas surrounding the source. The keys are: (1) sharp cut-off at low frequency in the spectrum, and (2) asymmetric peak frequency in double lobe. In order to investigate the nature of FFA in GPS sources, we observed nine objects (five QSOs, two RGs, two Sy2s) selected from GPS catalog. We tried spectral fitting using FFA model for each source. All QSOs show asymmetric FFA opacities like OQ208 does, while the opacity of RGs and Sy2s are symmetric. This supports the unification model between RGs and QSOs.

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