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A2255 as seen by LOFAR Roberto Pizzo, Annalisa Bonafede, Reinout van Weeren, Giulia Macario

A2255 as seen by LOFAR Roberto Pizzo, Annalisa Bonafede, Reinout van Weeren, Giulia Macario. At 25 cm. At 85 cm. Relic. Halo. Bridge. FWHM ~ 15’’ s ~ 11 m Jy/beam. FWHM ~ 1’ s ~ 0.1 mJy/beam. THE OBSERVATION. L2011_24627: 1-7 am of March 27 th 2011

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A2255 as seen by LOFAR Roberto Pizzo, Annalisa Bonafede, Reinout van Weeren, Giulia Macario

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  1. A2255 as seen by LOFAR Roberto Pizzo, Annalisa Bonafede, Reinout van Weeren, Giulia Macario

  2. At 25 cm At 85 cm Relic Halo Bridge FWHM ~ 15’’ s ~ 11 m Jy/beam FWHM ~ 1’ s ~ 0.1 mJy/beam

  3. THE OBSERVATION • L2011_24627: 1-7 am of March 27th 2011 • The observation was supposed to cover the frequency range between 210-250 • MHz, but due to a problem during scheduling only the frequencies between 225-250 MHz • (SB000-070) could be used for the data reduction. • We performed a few tests to understand what approach to follow for the data reduction

  4. Cas A & Cyg A: subtraction in BBS • Data averaged by a factor of • 6 in frequency • Models for Cas and Cyg extracted • from the 74 MHz maps • Test done on SB000 (225 MHz)

  5. Cas A & Cyg A: demixing Data have not been averaged. Plots refer to SB000

  6. WENSS model • 230 components • Data averaged to 10 sec and 2 channels SB064 Data clipped at 40 Jy dynamic range ~ 350

  7. Pizzo’s model • 750 components • Data averaged to 10 sec and 2 channels Clipping at 40 Jy after calibration SB064 dynamic range ~ 330

  8. Difference between Global solver and single-SB solver No big difference is seen in the noise level but the image with the global calibration looks better (i.e., the huge head-tail to the south of the cluster center is better visible).

  9. The pipeline process SB00-025 excluded from the processing Courtesy of R. Pizzo, R. van Weeren, A. Bonafede & C. Ferrari dynamic range ~ 2.500

  10. Abell 2255 in HBA (225-250 MHz) Courtesy of R. Pizzo, R. van Weeren, A. Bonafede & C. Ferrari 53 SBs, dynamic range ~ 2.500

  11. Abell 2255 in HBA (225-250 MHz) Courtesy of R. Pizzo, R. van Weeren, A. Bonafede & C. Ferrari 53 SBs, dynamic range ~ 2.500

  12. Broad-band low-level RFI SB000

  13. Broad-band low-level RFI SB010

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