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Luminous Infrared Galaxies ( LIRGs)

Molecular Line Measurements of Luminous Infrared Galaxies (LIRGs ) AO 4 David Cotten Alexandre Roman-Lopes Carol Lonsdale Ximena Fernandez Advisor: Chris Salter. Luminous Infrared Galaxies ( LIRGs). Emit most of the energy in the infrared L ir > 10 11 L 

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Luminous Infrared Galaxies ( LIRGs)

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  1. Molecular Line Measurements of Luminous Infrared Galaxies (LIRGs)AO 4David CottenAlexandre Roman-LopesCarol LonsdaleXimena FernandezAdvisor: Chris Salter

  2. Luminous Infrared Galaxies (LIRGs) • Emit most of the energy in the infrared • Lir> 1011 L • Found in interacting/merging systems • ULIRGs: Lir> 1012 L • Mostly advanced mergers

  3. Arp 220 HCN λ6 cm excited OH transitions Methanimine Methanol Salter et al. 2008

  4. Observing Targets IC 860 z=0.012943 log(Lir)=10.78 Zw049.057 z=0.012999 log(Lir)=10.99

  5. Spectral Line Observations • L-Band Wide Receiver (1.15-1.75 GHz) • Wideband Arecibo Pulsar Processor (WAPP) Spectrometer • HI Line: 1420 Mhz • OH main-line: 1665-MHz • OH main-line: 1667-MHz • OH satellite line: 1612-MHz • OH satellite line: 1720-MHz • OH main-lines: 1637 & 1639 MHz, Formic Acid:1638 MHz • HCN line: 1346 MHz • HCO+ line: 1270 MHz • Observing technique: Double Position Switching (DPS)

  6. IC860 IC860 • OH main-lines: 1665 & 1667-MHz HI Line • OH satellite lines: 1612 & 1720-MHz • OH main-lines: 1637 & 1639 MHz, Formic Acid:1639 MHz • HCN line: 1346 MHz • HCO+ line: 1270 MHz

  7. Zw049.057 • OH main-lines: 1665 & 1667-MHz HI Line • OH satellite lines: 1612 & 1720-MHz • OH main-lines: 1637 & 1639 MHz, Formic Acid:1639 MHz • HCN line: 1346 MHz • HCO+ line: 1270 MHz

  8. New detection of the Satellite Lines in Zw049.057! Both lines have conjugate behavior: two transitions competing for the same pumping photons

  9. Estimates for Column Density

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