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Article overview
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Nature of X-shaped sources | D.V. Lal
; M.J. Hardcastle
; R.P. Kraft
; C.C. Cheung
; A.P. Lobanov
; J.A. Zensus
; S. Bhatnagar
; A.P. Rao
; | Date: |
17 Apr 2009 | Abstract: | The nature of X-shaped sources is a matter of considerable debate: it has
even been proposed that they provide evidence for black hole mergers$ / $spin
reorientation, and therefore constrain the rate of strong gravitational wave
events (Merritt & Ekers 2002). Based on morphological and spectral
characteristics of these sources, currently a strong contender to explain the
nature of these sources is the ’alternative’ model of Lal & Rao (2007), in
which these sources consist of two pairs of jets, which are associated with two
unresolved AGNs. Detailed morphological and spectral results on
milliarcsecond-scales (mas) provide a crucial test of this model, and hence
these sources are excellent candidates to study on mas; {it i.e.}, to detect
he presence/absence of double nuclei/AGNs, signs of helical/disrupted jets,
thereby, to investigate spatially resolved/unresolved binary AGN systems and
providing clues to understanding the physics of merging of AGNs on mas. We
conducted a systematic study of a large sample of known X-shaped, comparison FR
II radio galaxies, and newly discovered X-shaped candidate sources using Giant
Metrewave Radio Telescope and Very Large Array at several radio frequencies. In
our new observations of ’comparison’ FR II radio galaxies we find that almost
all of our targets show standard spectral steepening as a function of distance
from the hotspot. However, one source, 3C 321, has a low-surface-brightness
extension that shows a flatter spectral index than the high-surface-brightness
hotspots$ / $lobes, as found in ’known’ X-shaped sources. | Source: | arXiv, 0904.2725 | Services: | Forum | Review | PDF | Favorites |
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