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Chemistry Study in IRS1 and Hot Cores Using Spectral Line Data

This study analyzes spectral line data from IRS1 and hot cores, examining species, excitation temperatures, and column densities. Conclusions highlight similarities and differences in chemistry and ionization front velocities.

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Chemistry Study in IRS1 and Hot Cores Using Spectral Line Data

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  1. S 140 PDR reagions and hotcores Group 1: Yunhee Choi, Juan Luis Verbena, Evgenia Koumpia, Karen Olsen, Sara Cuadrado, Gustavo Orellana Under supervision: Asunción Fuente, Christof Buchbender

  2. After baselining and off-position correction: Off-position minus 2nd off-position spectrum: + =

  3. IRS1 : CO, C18O 13CO, CN, N2H+, CN, C34S, CCH, HCO+ HCN, SO, SO2, SiO, CH3OH IF : CO, 13CO, CN, CCH, HCN, HCO+ Line Identification Ta (K) IRS1 Ta (K) IF

  4. Velocity-distributionmaps of the12CO(2-1) gas 12CO(2-1) moment0 map with: Black contours: 12CO(1-0) White contours: SO(2(3)-1(2))

  5. 12CO (1-0) and 13CO (1-0) White contours: 13CO (1-0)

  6. SO (2(3)-1(2)) v=0

  7. Integrated (mean) intensities

  8. Specie: CN Excitation temp: 100 (K) Colum density: 1.5e15 (part/cm^2) Specie: CHO+ Excitation temp: 100 (K) Colum density: 0.85e15 (part/cm^2) Beam size > source size: don’t think of filling factor

  9. Specie: CN Excitation temp: 100 (K) Colum density: 1.5e15 (part/cm^2) Specie: CHO+ Excitation temp: 100 (K) Colum density: 0.85e15 (part/cm^2)

  10. Specie: CCH Excitation temp: 10 (K) Colum density: 1.5e14 (part/cm^2) Specie: HCN Excitation temp: 10 (K) Colum density: 1.2e13 (part/cm^2) Specie: 13CO Excitation temp: 10 (K) Colum density: 3.0e15 (part/cm^2)

  11. Specie: CN Excitation temp: 10 (K) Colum density: 1.5e13 (part/cm^2) • Specie: CHO+ Excitation temp: 100 (K) Colum density: 0.85e15 (part/cm^2) • *Hydrogen column density IRS1: 2.5e23 (part/cm^2) • IF : 3e21 (part/cm^2)

  12. Conclusions • Chemistry in IRS1 more similar to a hot core • Distinct velocities of ionization front and hot core • CN/HCN ratio is similar in the two positions, probably because of the large beam • C2H is more abundant in the IF Gracias!

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