Sources at the z declination of Cygnus A Trevor Oxholm July 20, - PowerPoint PPT Presentation

Sources at the z declination of Cygnus A Trevor Oxholm July 20, 2018

z 3 primary sources Cygnus A: 1.6 kJy § Source 2: 22.8 Jy § Source 3: 9.8 Jy § Source map 90 80 70 60 50 40 30 20 10 0 0 50 100 150 200 250 300 350

z Source 2: RA=49.95; dec=41.51 22.8 Jy § 4 sources contribute 98% of total squared flux § Source 2 -- map of sources contributing 99% squared flux 9 sources contribute 99% of total squared flux § 43.5 43 42.5 42 41.5 Source 2 -- Sources contribution to squared flux 41 0.995 40.5 0.99 40 0.985 39.5 0.98 39 0.975 47 48 49 50 51 52 53 0.97 0.965 0 2 4 6 8 10

z Source 3: RA=68.152; dec=41.641 9.8 Jy § Source 3 -- map of sources contributing 98% squared flux 6 sources contribute 95% of total squared flux § 46 44 42 11 sources contribute 98% of total squared flux § 40 38 20 sources contribute 99% of total squared flux § 36 64 66 68 70 72 74 Source 3 -- map of sources Source 3 -- Sources contribution to contributing 99% squared flux squared flux 46 1 45 0.98 44 0.96 43 0.94 42 41 0.92 40 0.9 39 0.88 38 37 0.86 60 62 64 66 68 70 72 74 0 5 10 15 20 25

z Other sources Source 5: (330.68,42.3) Source 4: (250.74,39.8) 9.05 Jy (weaker because of distance § 7.10 Jy § from Cygnus A’s declination) 9 sources contribute 95% of total § 8 sources contribute 95% of total § squared flux squared flux 29 sources contribute 98% of total § 36 sources contribute 98% of total § squared flux squared flux 65 sources contribute 99% of total 83 sources contribute 99% of total § § squared flux squared flux