gas detection in galaxies and techniques c omparisons
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
Gas Detection in Galaxies and Techniques Comparisons
Advisors: David Frayer and Ron Maddalena
Teresa AshcraftRich Cosentino
Lucas HuntKaren Lee-Waddell
Virginie Montes
Galaxies SelectedIRAS 16504+0228Seyfert 2 galaxyIRAS 12596-1529
IRAS 11257+5850Interacting galaxy
Galaxy 1 Galaxy 2 Galaxy 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
Methods Comparison:Galaxy 1
Three methods Position and Frequency-position switch
RMSps = 7.7x10-3
RMSfsps = 6.6x10-3
Methods Comparison
RMSps = 7.2x10-3
RMSfsps = 5.8x10-3
RMSps = 8.4x10-3
RMSfsps = 7.3x10-3
Galaxy 2 Galaxy 3
RMS improvement: expected = 1.6 and observed = 1.2
Baseline ComparisonPosition switch Frequency-position switch
Galaxy 1 Galaxy 1
Galaxy 3 Galaxy 3
Baseline Comparison
Position switch Frequency-position switch
Galaxy 2 Galaxy 2
NHI = 1.7x1020cm-2 NHI = 1.6x1020cm-2
OH Spectral lineGalaxy 1
OH Spectral lineARP 220
Expected OH1665 : OH1667 = 5:9 (LTE) Observed OH1665 : OH1667 = 1:4 (Maser IR pumping)