Mon. Not. R. Astron. Soc., 366, 1391-1398 (2006/March-2)
J0041+3224: a new double-double radio galaxy.
SAIKIA D.J., KONAR C. and KULKARNI V.K.
Abstract (from CDS):
We report the discovery of a double-double radio galaxy (DDRG), J0041+3224, with the Giant Metrewave Radio Telescope (GMRT) and subsequent high-frequency observations with the Very Large Array (VLA). The inner and outer doubles are aligned within ∼4° and are reasonably collinear with the parent optical galaxy. The outer double has a steeper radio spectrum compared to the inner one. Using an estimated redshift of 0.45, the projected linear sizes of the outer and inner doubles are 969 and 171 kpc, respectively. The time-scale of interruption of jet activity has been estimated to be ∼20 Myr, similar to other known DDRGs. We have compiled a sample of known DDRGs, and have re-examined the inverse correlation between the ratio of the luminosities of the outer to the inner double and the size of the inner double, lin. Unlike the other DDRGs with lin≳ 50 kpc, the inner double of J0041+3224 is marginally more luminous than the outer one. The two DDRGs with lin≲ few kpc have a more luminous inner double than the outer one, possibly due to a higher efficiency of conversion of beam energy as the jets propagate through the dense interstellar medium. We have examined the symmetry parameters and found that the inner doubles appear to be more asymmetric in both its armlength and its flux density ratios compared to the outer doubles, although they appear marginally more collinear with the core than the outer double. We discuss briefly the possible implications of these trends.
2006 The Authors. Journal compilation © 2006 RAS
galaxies: active - galaxies: individual: J0041+3224 - galaxies: nuclei - radio continuum: galaxies
Fig.1: [SKK2006] J0041+3224 WN (Nos E1-E2, W1-W2).
View the reference in ADS
To bookmark this query, right click on this link: simbad:2006MNRAS.366.1391S and select 'bookmark this link' or equivalent in the popup menu