Intermittent jet activity in the radio galaxy 4C 29.30
Intermittent jet activity in the radio galaxy 4C 29.30
复制标题
射电星系4C 29.30中的间歇性喷流活动
DOI：
10.1111/j.1365-2966.2007.11782.x
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发表时间：
2007
影响因子：
4.8
通讯作者：
Usa
中科院分区：
文献类型：
--
作者：
M. Jamrozy;C. Konar;D. Saikia;L. Stawarz;K. Mack;A. S. O. Astronomiczne;Uniwersytet Jagielloński;P. C. F. P. Astrophysics;Tifr;I. N. C. F. R. Astrophysics;Cosmology;Stanford University;Usa Stanford Linear Accelerator Center;Usa Istituto Nazionale di Astrofisica;Istituto di Radioastronomia;Italy Harvard;Usa
我们利用巨型米波射电望远镜（GMRT）、甚大阵列（VLA）和Effelsberg望远镜对射电星系4C29.30 （J0840+2949）进行了240至8460 MHz频率的射电观测。我们报道了角尺寸为{约}520 arcsec （639 kpc）的弱扩展发射的存在，其中嵌入了一个尺寸为29 arcsec （36 kpc）的紧凑边缘增亮双裂片源。我们确定了从240到8460 MHz的内双频的频谱，并表明它具有单一的幂律频谱，频谱指数为{约}0.8。它的光谱年龄估计为33兆尔。扩展漫射具有陡峭的光谱，光谱指数为{约}1.3，中断频率为240 MHz。光谱年龄为{约}200 Myr，表明扩散发射的延长是由于早期的活动周期。我们重新分析了钱德拉的x射线档案数据，并提出热点地区的x射线辐射由非热和热成分的混合物组成，后者可能是由于气体被宿主星系的喷流加热而产生的激波。
We present radio observations at frequencies ranging from 240 to 8460 MHz of the radio galaxy 4C29.30 (J0840+2949) using the Giant Metrewave Radio Telescope (GMRT), the Very Large Array (VLA) and the Effelsberg telescope. We report the existence of weak extended emission with an angular size of {approx} 520 arcsec (639 kpc) within which a compact edge-brightened double-lobed source with a size of 29 arcsec (36 kpc) is embedded. We determine the spectrum of the inner double from 240 to 8460 MHz and show that it has a single power-law spectrum with a spectral index is {approx} 0.8. Its spectral age is estimated to be 33 Myr. The extended diffuse emission has a steep spectrum with a spectral index of {approx} 1.3 and a break frequency 240 MHz. The spectral age is {approx}>200 Myr, suggesting that the extended diffuse emission is due to an earlier cycle of activity. We reanalyze archival x-ray data from Chandra and suggest that the x-ray emission from the hotspots consists of a mixture of nonthermal and thermal components, the latter being possibly due to gas which is shock heated by the jets from the host galaxy.