科研之友
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摘要
We discovered an X-ray cluster in a Chandra observation of the compact steep spectrum (CSS) radio source 1321+045 (z = 0.263). CSS sources are thought to be young radio objects at the beginning of their evolution and can potentially test the cluster heating process. 1321+045 is a relatively low-luminosity source and its morphology consists of two radio lobes on the opposite sides of a radio core with no evidence for jets or hotspots. The optical emission line ratios are consistent with an interstellar medium dominated by active galactic nucleus photoionization with a small contribution from star formation, and no contributions from shocks. Based on these ratios, we classify 1321+045 as a low excitation galaxy (LEG) and suggest that its radioactivity is in a coasting phase. The X-ray emission associated with the radio source is detected with 36.1 +/- 8.3 counts, but the origin of this emission is highly uncertain. The current X-ray image of the cluster does not show any signatures of a radio source impact on the cluster medium. Chandra detects the cluster emission at >3 sigma level out to similar to 60 '' (240 kpc). We obtain the best-fit beta model parameters of the surface brightness profile of beta = 0.58 +/- 0.2 and a core radius of 9.4(-0.9)(+1.1) arcsec. The average temperature of the cluster is equal to kT = 4.4(-0.3)(+0.5) keV, with a temperature and cooling profile indicative of a cooling core. We measure the cluster luminosity L(0.5-2 keV) = 3 x 10(44) erg s(-1) and mass 1.5 x 10(14) M-circle dot.
- 出版日期2013-7-20
