1 / 12

Approaching NGC 3079 with VLBI (Are Seyfert Jets Green?)

Approaching NGC 3079 with VLBI (Are Seyfert Jets Green?). Enno Middelberg MPIfR, Bonn. In collaboration with T. P. Krichbaum A. L. Roy A. Witzel J. A. Zensus. Introduction – Motivation. - Radio loud vs radio quiet: Seyfert "jets" intrinsically slow? -Spectra ? -Variability ?

tadhg
Download Presentation

Approaching NGC 3079 with VLBI (Are Seyfert Jets Green?)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Approaching NGC 3079 with VLBI (Are Seyfert Jets Green?) Enno Middelberg MPIfR, Bonn In collaboration with T. P. Krichbaum A. L. Roy A. Witzel J. A. Zensus

  2. Introduction – Motivation -Radio loud vs radio quiet:Seyfert "jets" intrinsically slow? -Spectra? -Variability? -Brightness temperatures?

  3. Introduction – NGC 3079 facts VLBA 5 GHz, Trotter et al. 1998 B-VLA 1.4 GHz, Duric et al. 1983 HST + Chandra, Cecil et al. in prep. / NASA 2 kpc 2 pc Distance 15 Mpc Scale 0.07 pc / mas AGN type Seyfert 2 / LINER Nucleus ~106 M·(H2O maser) Optical Ha filaments "Superbubble" X-Ray aligns with Ha Radio kpcdouble lobes OHabsorption CO circumnuclear disk pc aligned components

  4. Observations Nov 1999 / Apr 2000 / Nov 2000: VLBA+Effelsberg @ 1.7 / 5 / 15 GHz Sep 2002: VLBA @ 1.7 / 2.3 / 5 GHz, -ref, polarimetric Effelsberg at 1.7 GHz for matching resolution

  5. Results X B B N C 15 GHz, Nov 00 5 GHz, j-ref, Sep 02 A A X X N N 2.3 GHz, j-ref, Sep 02 1.7 GHz, j-ref, Sep 02 A

  6. Results 1.7 GHz X B 2.3 GHz N 5.0 GHz C 15 GHz A 1 pc

  7. Discussion – Spectra Spectral variability B A

  8. Discussion – Spectra SN 1979C, Weiler et al. / NRL X Free-free absorption? Fit yields: aintr = -4.59 ne2 L = 57 106pc cm-6 Several absorption mechanisms! Supernova? Possible, but uncertain

  9. Discussion – Proper motion 0.48± 0.02 mas/yr = 0.12± 0.012c

  10. Discussion – Proper motion

  11. Discussion – Statistics Proper motion Spectral indices Proper motion: generally < 0.5c Spectra: 10/13 have flat / inverted VLBI components Misalignment: 8/11 are misaligned by more than 15° Misalignment

  12. Summary NGC 3079 observed during 4 epochs at 4 frequencies Spectral variability Extreme spectra in off-axis component. Supernova? Proper motion of 0.12c – characteristic for Seyferts Core position unclear, later j-ref needed to decide Growing evidence: Seyferts are intrinsically weak, slow and misaligned.

More Related