Extended emission-line gas around the quasars 3C 254 and 3C 309.1 - Very massive cooling flows

Details Extended emission-line gas around the quasars 3C 254 and 3C 309.1 - Very massive cooling flows Extended emission-line gas around the quasars 3C 254 and 3C 309.1 - Very massive cooling flows

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.244..680f&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 244, June 15, 1990, p. 680-690. Research supported by B

Astronomy and Astrophysics

Astrophysics

47

Cooling Flows (Astrophysics), Emission Spectra, Interstellar Gas, Light (Visible Radiation), Quasars, Gas Flow, Gas Pressure, Radio Galaxies, Red Shift, Stellar Luminosity

Scientific paper

Optical spectra of the radio-loud quasars 3C 254 (z = 0.734) and 3C 309.1 (z = 0.905) are presented, showing them to be surrounded by extensive emission-line gas. The gas around 3C 254 extends to a radius of at least 80 kpc. The pressure profiles imply that the cooling time of the intracluster gas is so short that both quasars must be surrounded by very massive cooling flows. They are the most extreme examples yet found. The flow around 3C 309.1 exceeds 1000 solar masses/yr within 21 kpc and can easily form the central galaxy within a Hubble time. A trend of increasing gas pressure with redshift suggests that mass deposition rates were stronger in the past and that cooling flows are a significant galaxy formation process. Observations of 3C 254 at different position angles are used to study the degree of anisotropy of the quasar continuum radiation. The extended emission-line gas around quasars has several properties in common with that around powerful radio galaxies.

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