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Gas Detection in Galaxies and Techniques C omparisons

Gas Detection in Galaxies and Techniques C omparisons. Advisors: David Frayer and Ron Maddalena. Teresa Ashcraft Rich Cosentino Lucas Hunt Karen Lee-Waddell Virginie Montes. Galaxies Selected. IRAS 11257+5850 Interacting galaxy. IRAS 16504+0228 Seyfert 2 galaxy. IRAS 12596-1529.

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Gas Detection in Galaxies and Techniques C omparisons

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  1. Gas Detection in Galaxies and Techniques Comparisons Advisors: David Frayer and Ron Maddalena Teresa Ashcraft Rich Cosentino Lucas Hunt Karen Lee-Waddell Virginie Montes

  2. Galaxies Selected IRAS 11257+5850 Interacting galaxy IRAS 16504+0228 Seyfert 2 galaxy IRAS 12596-1529 Galaxy 1 Galaxy 2 Galaxy 3

  3. Observation Procedure • Two data sets and three techniques: • frequency switching • position switching • “brain-dead” Maddelena Magic!! (freq+position switch) • Observation time: 45 min per galaxy

  4. Methods Comparison:Galaxy 1 Position and Frequency-position switch Three methods RMSps = 7.7x10-3 RMSfsps = 6.6x10-3

  5. Methods Comparison Galaxy 2 Galaxy 3 RMSps = 8.4x10-3 RMSfsps = 7.3x10-3 RMSps = 7.2x10-3 RMSfsps = 5.8x10-3 RMS improvement: expected = 1.6 and observed = 1.2

  6. Baseline Comparison Position switch Frequency-position switch Galaxy 1 Galaxy 1 Galaxy 3 Galaxy 3

  7. Baseline Comparison Position switch Frequency-position switch Galaxy 2 Galaxy 2 NHI = 1.7x1020cm-2 NHI = 1.6x1020cm-2

  8. OH Spectral lineGalaxy 1

  9. OH Spectral lineARP 220 Expected OH1665 : OH1667 = 5:9 (LTE) Observed OH1665 : OH1667 = 1:4(Maser IR pumping)

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