Skip to main content Accessibility help
×
Home

3C 120. Properties of 4 Condensations Neighbouring the Nucleus and Emitting in the Continuum

  • A. Soubeyran (a1), G. Wlérick (a1), G. Lelièvre (a1), B. Servan (a1), L. Renard (a1), D. Horville (a1), A. Bijaoui (a2) and P. Bouchet (a3)...

Extract

Electronographic plates have been obtained with the ESO 3,6 m telescope and the CFH telescope. One of the plates is reproduced figure 1. We have studied the regions surrounding the nucleus of 3C 120 (r<8″) and emitting in the continuum. The “jet” found by Wlérick et al. (1981) has been resolved into 3 condensations, A, B and D; another condensation C is located 7″ S-E of the nucleus; a filament F leaves the nucleus in the direction of condensation B. The 4 condensations have been measured in colours U B V and V′, this last band excluding the [OIII] emission lines. We have located each condensation with respect to the zones where gaz emission is observed and particularly two regions that we call E1 and E2. We have also located condensation A with respect to the radiojet and we have searched, in B and V colours, for polarization of this condensation. The results are the following:

  1. 1.The 4 condensations are faint: 20,0<B<20,8, corresponding Jo the absolute magnitudes: −16,1 < Mg<−15, 3, using H = 60 km s−1 Mpc−1. Colours of condensations A, B and D are similar: U-B∼−0,20; B-V∼0,87; condensation C is less blue: U-B∼0,30; B-V∼0,90.
  2. 2.The brightest condensation A is elongated nearby North-South, its southern part pointing toward S-E (Fig. 1). It is interesting to place A with respect to the radiojet (cf. Browne et al., 1982, Walker et al., 1987). The maximum of A is located 1″ North of the first knot of the jet but the southern part of A coincides with this knot. The maximum of the emission region E1 is located 1″ West of the maximum of A, but region overlaps a large part of A. Though no significant polarization has been found for A taken globally, we suggest that the flux of A consists of two parts: in the southern region of A, the flux could be synchrotron radiation corresponding to a spectral index radio-visible ∼0,7; the northern part of A would be a zone of star formation triggered by the impact of the jet on region E1; the situation is very similar to the one found with Minkowskis object (Van Breugel et al., 1985; Brodie et al., 1985), concerning the relative position of A and the jet, as well as the variation of polarization of this jet and its change of direction; on the other hand, A is not as blue as Minkowski's object and this is likely due to the fact that the number of young stars is smaller; the change of the polarization in a well localized part of the radio knot (Walker et al., 1987) suggests that the gazeous region E1 is flattened and that the jet crosses it obliquely.
  3. 3.Condensations B and D form a chain with A and they are located in a region where no emission is observed; they are made probably of stars older than the one of condensation A.
  4. 4.Brightness and colours of condensation C are similar to those of the nucleus of a spiral galaxy. We suggest that C is the residue of a galaxy captured by 3C 120; this agrees with the work of Heckman et al. (1986); these authors consider a galaxy merger as the origin of the activity of 3C 120 and, as they do not see any neighbouring galaxy, they state that the merger has nearly reached completion. The bright gazeous region E2 connects possibly C and the nucleus of 3C 120.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      3C 120. Properties of 4 Condensations Neighbouring the Nucleus and Emitting in the Continuum
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      3C 120. Properties of 4 Condensations Neighbouring the Nucleus and Emitting in the Continuum
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      3C 120. Properties of 4 Condensations Neighbouring the Nucleus and Emitting in the Continuum
      Available formats
      ×

Copyright

References

Hide All
Baldwin, J.A. et al.: 1980, Astrophys.J. 236, 388
Brodie, J.P., Bowyer, S., McCarthy, P.: 1985, Astrophys.J. 293, L59
Browne, I. et al.: 1982, Nature 299, pp. 788793
Heckman, T. et al.: 1986, Astrophys. J. 311, pp. 526547
Van Breugel, W. et al.: 1985, Astrophys. J. 293, pp. 8393
Walker, R.C., Benson, J.M., Unwin, S.C.: 1987, Astrophys. J. 316, 546
Wlérick, G., Bouchet, P., Cayatte, V., Michet, D.: 1981, Astron. Astrophys. 102, L17L20

3C 120. Properties of 4 Condensations Neighbouring the Nucleus and Emitting in the Continuum

  • A. Soubeyran (a1), G. Wlérick (a1), G. Lelièvre (a1), B. Servan (a1), L. Renard (a1), D. Horville (a1), A. Bijaoui (a2) and P. Bouchet (a3)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed