Relativistic Kinematics of Bipolar Ejecta from AGN (with Application to NGC 4258)

Details Relativistic Kinematics of Bipolar Ejecta from AGN (with Application to NGC 4258) Relativistic Kinematics of Bipolar Ejecta from AGN (with Application to NGC 4258)

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.1604o&link_type=abstract

American Astronomical Society, 188th AAS Meeting, #16.04; Bulletin of the American Astronomical Society, Vol. 28, p.846

Astronomy and Astrophysics

Astronomy

2

Scientific paper

The kinematical model of jets/blobs ejected from AGN relativistically with equal velocities in the opposite directions(1) is developed to determine the basic parameters of the model if the redshifts of the two jets/blobs, z_1 and z_2(>z_1), can be measured. The bulk Lorentz factor, gamma , and the direction of the ejecta, l= cos icos theta (i being the inclination angle and theta being the angle between the jet/blob direction and the rotational axis), are found to be gamma equiv 1/sqrt {1-beta (2}) =1+{1/ 2} (z_1+z_2right ) and l=(z_2-z_1right )/2gamma beta , respectively. Recently, optical redshifts of two ejecta have been measured (presumably for the first time in an extragalactic object) for the two central blobs in NGC 4258 to be z_1=0.398 and z_2=0.653 (ref.(2) ). The above equations yield beta =0.755, gamma =1.525, l=0.111. Assuming, for simplicity, theta =0, this gives i=83(deg) .6, which should be confronted with the observationally found i=83(deg) +/- 4(deg) (ref.(3) ). The Doppler, and not an intrinsic (such as gravitational), nature of the blob redshifts, as well as the validity of the relativistic model as a whole can be further tested by measuring the following predicted features of a purely relativistic origin: (i) arm length asymmetry Q=(1+beta cos iright )/(1-beta cos iright )= 1.18 and (ii) superluminal flying apart of the blobs with the relative velocity v=2beta csin i/(1-beta (2cos ^2) iright )= 1.49 c. If the blobs observed so far in X-rays and at optical wavelengths also have radio counterparts, VLA observations could reveal their proper motion expected to be as large as 1.3* 10(-2) (D/7 Mpc right )(-1) arc sec/yr, where D is the distance to the galaxy. While a putative central black hole in NGC 4258 with its masing disk offers a general relativity lab, the central blobs turn out to be a special relativity lab (even though i is not small!) Thus the nucleus of this galaxy, as a whole, represents the nearest extragalactic true relativity laboratory. References: (1) Ozernoy, L.M. & Sazonov, V.N. 1968, Nature 219, 467; 1969, Ap. Sp. Sci. 3, 395. (2) Burbidge, E.M. 1995, A&A 298, L1. (3) Miyoshi, M. et al. 1995, Nature 373, 127.

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