Observations of OH + and H 2 O + Across the Galaxy with Herschel Nick Indriolo 1, David Neufeld 1, Maryvonne Gerin 2, & PRISMAS consortium 1 – Johns Hopkins.

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Presentation transcript:

Observations of OH + and H 2 O + Across the Galaxy with Herschel Nick Indriolo 1, David Neufeld 1, Maryvonne Gerin 2, & PRISMAS consortium 1 – Johns Hopkins University 2 – LERMA, CNRS, Observatoire de Paris & ENS June 20, th International Symposium on Molecular Spectroscopy WH05

What is PRISMAS? PRobing InterStellar Molecules with Absorption line Studies Herschel guaranteed time key program headed by Maryvonne Gerin Uses H II regions as background THz sources to probe intervening clouds for rotational transitions of small moleclues

PRISMAS sight lines

Oxygen Chemistry CR + H  H + + e - + CR' H + + O  O + + H O + + H 2  OH + + H OH + + H 2  H 2 O + + H H 2 O + + H 2  H 3 O + + H OH + + e -  products H 2 O + + e -  products H 3 O + + e -  products O + + H  H + + O H + + e -  H + hν OH + H2H2 H2O+H2O+ H2H2 H3O+H3O+ CR H H+H+ O O+O+ H2H2 H e-e- e-e- e-e- e-e-

H 2 Fraction & Ionization Rate OH + + H 2 H 2 O + + H 2 H 2 O + + e - CR + H OH + + H 2 OH + + e -

OH + Transitions N=0 N=1 J=1 J=2 J=0 F=3/2 F=1/2 F=3/2 F=1/2 F=3/2 F=5/2 909 GHz971 GHz 1033 GHz

OH + Observations

H 2 O + Transitions Schilke et al A&A, 521, L11Bruderer et al 2010 A&A, 521, L44

ortho-H 2 O + Observations

para-H 2 O + toward W51

W49N Profile Fitting Neufeld et al A&A, 521, L10

Determining Column Densities

W49N Results v LSR ΔvΔvN(OH + )N(H 2 O + ) (km/s) (10 13 cm -2 ) f H N(H) (10 21 cm -2 ) εζ H ( s -1 ) Neufeld et al A&A, 521, L10 Assume ε=0.1

Preliminary Ionization Rates ΔvΔvζHζH σ(ζ H ) (km/s)( s -1 ) 30— — — — — — — — — W49N G W51

Distribution of Ionization Rates Probability Density Function Cumulative Distribution Function Indriolo & McCall 2012 ApJ, 745, 91

Future Work Continue analyzing OH +, o-H 2 O +, p-H 2 O +, and H 3 O + spectra from PRISMAS Add OH + and o-H 2 O + observations from the WISH program to our sample Utilize new JVLA observations of H I in inferring ionization rates Map ζ H as a function of position in the Galaxy