Do Jet-Driven Shocks ionize the Narrow Line Regions of Seyfert Galaxies?

Details Do Jet-Driven Shocks ionize the Narrow Line Regions of Seyfert Galaxies? Do Jet-Driven Shocks ionize the Narrow Line Regions of Seyfert Galaxies?

1999-01-23

arxiv.org/abs/astro-ph/9901329v1

Astronomy and Astrophysics

Astrophysics

Astrophys J. Letters 1999 March 10 issue, Vol. 513

Scientific paper

10.1086/311923

We consider a model in which the narrow line regions (NLRs) of Seyfert galaxies are photoionized ``in situ'' by fast (300 -- 1,000 km/s), radiative shock waves driven into the interstellar medium of the galaxy by radio jets from the active nucleus. Such shocks are powerful sources of soft X-rays. We compute the expected ratio of the count rates in the ROSAT PSPC and Einstein IPC detectors to the [OIII] \lambda 5007 flux as a function of shock velocity, and compare these ratios with observations of type 2 Seyferts. If most of the observed soft X-ray emission from these galaxies originates in the NLR and the absorbing hydrogen column is similar to that inferred from the reddening of the NLR, a photoionizing shock model with shock velocity $\simeq$ 400 -- 500 km/s is compatible with the observed ratios. High angular resolution observations with AXAF are needed to isolate the X-ray emission of the NLR and measure its absorbing column, thus providing a more conclusive test. We also calculate the expected coronal iron line emission from the shocks. For most Seyfert 2s, the [Fe X] \lambda 6374/H \beta$ ratio is a factor of 2 -- 14 lower than the predictions of 300 -- 500 km/s shock models, suggesting that less hot gas is present than required by these models.

Affiliated with

Also associated with

No associations

Rating

Do Jet-Driven Shocks ionize the Narrow Line Regions of Seyfert Galaxies? 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 Do Jet-Driven Shocks ionize the Narrow Line Regions of Seyfert Galaxies?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Do Jet-Driven Shocks ionize the Narrow Line Regions of Seyfert Galaxies? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-652827