Collimated synchrotron threads linking the radio lobes of ESO137-006
M. Ramatsoku, M. Murgia, V. Vacca, P. Serra, S. Makhathini, F. Govoni, O. Smirnov, L. A. L. Andati, E. de Blok, G. I. G. Józsa, P. Kamphuis, D. Kleiner, F. M. M… 展开作者
M. Ramatsoku, M. Murgia, V. Vacca, P. Serra, S. Makhathini, F. Govoni, O. Smirnov, L. A. L. Andati, E. de Blok, G. I. G. Józsa, P. Kamphuis, D. Kleiner, F. M. Maccagni, D. Cs. Molnár, A. J. T. Ramaila, K. Thorat, S. V. White
备注：
5 pages, 4 figures, accepted for publication in A&A letters
We present MeerKAT 1000 MHz and 1400 MHz observations of a bright radio galaxy in the southern hemisphere, ESO~137-006. The galaxy lies at the centre of the massive and merging Norma galaxy cluster. The MeerKAT continuum images (rms ~0.02 mJy/beam at ~10" resolution) reveal new features that have never been seen in a radio galaxy before: collimated synchrotron threads of yet unknown origin, which link the extended and bent radio lobes of ESO~137-006. The most prominent of these threads stretches in projection for about 80 kpc and is about 1 kpc in width. The radio spectrum of the threads is steep, with a spectral index of up to $α\simeq 2$ between 1000 MHz and 1400 MHz.
The nearby elliptical galaxy IC4296 has produced a large (510 kpc) low-luminosity radio source with typical FR I core/jet/lobe morphology. The unprecedented combination of brightness sensitivity, dynamic range, and angular resolution of a new 1.28 GHz MeerKAT continuum image reveals striking new morphological features which we call threads, ribbons, and rings. The threads are faint narrow emission features originating where helical Kelvin-Helmholtz instabilities disrupt the main radio jets. The ribbons are smooth regions between the jets and the lobes, and they appear to be relics of jets powe…
The magnetic mayhem in Abell 2199: discovery of synchrotron threads and homogeneous diffuse radio lobes
Durham University（杜伦大学）；University of Minnesota（明尼苏达大学）；INAF - Instituto di Radioastronomia（意大利国家天体物理研究所射电天文研究所）；National Centre for Radio Astrophysics, Tata Institute of Fundamental Research（塔塔基础研究院国家射电天体物理学中心）
A New Perspective on the Radio Active Zone at The Galactic Center - Feedback from Nuclear Activities
基于我们使用Jansky VLA在6 cm处观察到的宽带数据的Sgr A的深度图像，我们提出了银河系中心无线电亮区的新观点。我们进一步展示了X射线炮弹的无线电探测，一个与银河系中心SNR Sgr A东相关的候选中子星。射电图像与钱德拉X射线图像进行了比较，以显示双极X射线叶的射电对应物的详细结构。双极波瓣可能是由Sgr A West内部活动产生的风产生的，它可能是由CND中气体的惯性或Sgr A* 的动量驱动而准直的;极向磁场可能在准直中起重要作用。与NW波瓣相比，SE波瓣的准直度较低，这可能是由于Sgr A东SN可能局部地将磁场重新配置为朝向负银河纬度。与X射线观测结果相一致，估算的最外层射电环的~ $1\times10^4$年时间尺度似乎与推断的Sgr A East SNR的年龄相当。
We present results from a polarization study of the radio-intermediate quasar, III Zw 2, at a redshift of 0.089, with the upgraded Giant Metrewave Radio Telescope (uGMRT) at 685 MHz and the Karl G. Jansky Very Large Array (VLA) at 5 and 34 GHz. We detect a kpc-scale outflow, exhibiting transverse magnetic (B-) fields. The curved jet terminates in a bow-shock-like radio structure with inferred B-fields aligned with the lobe edges. We suggest that the radio outflow in III Zw 2 is a combination of a collimated jet along with a wind-like component. This "wind" component could be a magnetized accre…
A comparison of the recent LOFAR 144 MHz map of the radio source 3C 223.1 (J094124.028+394441.95) with the VLA maps at 4.9 GHz and 8.3 GHz that we built based on archival data, establishes this X-shaped radio galaxy (XRG) as a singularly robust case where the 'wings' exhibit a distinctly flatter radio spectrum than the primary lobes. The details of its anomalous spectral gradient are unravelled here with unprecedented precision. We also highlight the 'double boomerang' type radio morphology of this XRG. It appears plausible that the peculiar spectral gradient in this XRG is owed to particle ac…
We present the first high-resolution 230-470 MHz map of the Perseus cluster obtained with the Karl G. Jansky Very Large Array. The high dynamic range and resolution achieved has allowed the identification of previously-unknown structures in this nearby galaxy cluster. New hints of sub-structures appear in the inner radio lobes of the brightest cluster galaxy NGC 1275. The spurs of radio emission extending into the outer X-ray cavities, inflated by past nuclear outbursts, are seen for the first time at these frequencies, consistent with spectral aging. Beyond NGC 1275, we also analyze complex r…
Recent observations have revealed interstellar features that apparently connect energetic activity in the central region of our Galaxy to its halo. The nature of these features, however, remains largely uncertain. We present a Chandra mapping of the central 2x4 square degree field of the Galaxy, revealing a complex of X-ray-emitting threads plus plume-like structures emerging from the Galactic center (GC). This mapping shows that the northern plume or fountain is offset from a well-known radio lobe (or the GCL), which however may represent a foreground HII region, and that the southern plume i…
The discovery of faint FR~I radio jets in the nearby elliptical galaxy NGC 5322 is reported here using 144 MHz LOFAR image. The jets have an angular extent of $\sim40$ arcmin or a projected physical extent of $\sim350$ kpc. The faint jets remain well collimated and disappear in the intergalactic medium, without any visible hotspot or radio lobes. The jets detected up to $\sim20$ kpc extent at higher frequencies are relatively bright within the optical extent of the galaxy but become faint abruptly outside, where detection is made only in the LOFAR image. The total radio luminosity of the galax…
