A wide angle tail radio galaxy in the COSMOS field

Image
Minimum credit line: Image courtesy of NRAO/AUI and Vernesa Smolcic, MPIA(for details, see Image Use Policy).

About this Image

Color composite image showing a wide angle tail radio galaxy, CWAT-01, and its environment discovered in the COSMOS field. The 20 cm continuum emission from its radio lobes (which is mainly due to synchrotron radiation of relativistic electrons) was observed with the VLA and is shown in white (bottom left part of the image). The B (blue), V (green) and i+ (red) band images, taken with the Subaru telescope, are shown in the background. These images show light observed in optical wavelengths which comes from foreground stars and stars in distant galaxies. Some of theses galaxies belong to the host cluster of CWAT-01. The X-ray emission of the galaxy clusters is shown in grey to red color gradients. It arises from bremsstrahlung of thermal electrons in the intra-cluster medium and was taken with the XMM-Newton satellite. Wide-angle tail galaxies are a special class of radio galaxies,usually found in galaxy clusters, whose radio jets are bent into a wide "C" shape. Their morphology suggests that they strongly interact with their external environment. Such galaxies are often found in merging cluster systems. The wide angle tail galaxy CWAT-01 is part of a very complex galaxy cluster assembly consisting of at least four X-ray luminous clusters at a redshift of z=0.2. This cluster system is presumably in the process of forming a large cluster having a minimum mass of about 20 percent of the Coma cluster mass.

Investigator(s):  Vernesa Smolcic, MPIA

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Technical Data

    Telescope VLA 
    Type of Observation Continuum Observations 
    Center of Image RA: 10:00:21.10, Dec: 02:23:3.10 (J2000)  
    Field of View 0.1667 x 0.1333 degrees  
    Technical Caption Color composite image showing a wide angle tail radio galaxy, CWAT-01, and its environment discovered in the COSMOS field. The SUBARU B (blue), V (green), and i+ (red) bands are displayed in the background. The diffuse X-ray emission (i.e. the wavelet reconstruction of the 0.5-2 keV band image observed with XMM-Newton) is presented by grey to red color gradients. The 1.4 GHz map (obtained using the VLA) is shown in white. The image encompasses an area of 10'x8' which corresponds to approximately (2.1x1.7) squared Mpc at the galaxy clusters' redshift of z=0.2. North is towards the top of the image and east towards left. CWAT-01 is part of a very complex galaxy cluster assembly consisting of at least four X-ray luminous clusters at the same redshift. This cluster system is presumably in the process of forming a large cluster. Using the total masses of the individual clusters obtained from the X-ray spectral analysis we estimate that the final single cluster after the individual clusters merge will have a minimum mass of about 20 percent of the Coma cluster mass. Details about this radio galaxy and cluster assembly can be found in Smolcic et al. 2006 (accepted for publication in ApJS).  

  • Astronomical database entries for CWAT-01
    • Query NED for images of CWAT-01
    • Query SIMBAD for more CWAT-01 data

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