What question did this study set out to answer?

To detect and quantify the abundance of interstellar hydrogen chloride (HCl) toward the giant molecular cloud Sagittarius B2.

July 10, 1995The Astrophysical JournalOpen Access

HC[CLC]l[/CLC] Absorption toward Sagittarius B2

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Authors

JŽJ. ŽmuidzinasCalifornia Institute of Technology GBG. A. BlakeCalifornia Institute of Technology JCJ. E. CarlstromArgonne National Laboratory

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Implication

Observational spectroscopic study detects hydrogen chloride absorption toward Sagittarius B2, indicating significant depletion of gas-phase chlorine in interstellar molecular envelopes.

Key Points

To detect and quantify the abundance of interstellar hydrogen chloride (HCl) toward the giant molecular cloud Sagittarius B2.
Observed the 626 GHz J = 1 → 0 transition of H35Cl in absorption against the background dust continuum emission of Sagittarius B2.
Constructed a detailed radiative transfer model incorporating collisional and radiative excitation, dust absorption and emission, and radial temperature and density variations.
Detected the transition with an apparent optical depth of τ ≈ 1, corresponding to a minimum HCl column density of 1.6 × 10¹⁴ cm⁻².
Achieved agreement between observed data and radiative transfer modeling at an abundance ratio of HCl/H₂ ≈ 1.1 × 10⁻⁹.
Determined a gas-phase chlorine depletion factor between 50 and 180 in the molecular envelope surrounding the Sgr B2(N) and Sgr B2(M) dust cores.

Cite This Study

Žmuidzinas et al. (1995) studied this question.

synapsesocial.com/papers/6a99075cdea2d226f518f02f https://doi.org/10.1086/309570

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Implication

Observational spectroscopic study detects hydrogen chloride absorption toward Sagittarius B2, indicating significant depletion of gas-phase chlorine in interstellar molecular envelopes.

HC[CLC]l[/CLC] Absorption toward Sagittarius B2

Discussion

Member takes

Implication

Key Points

Cite This Study

HC[CLC]l[/CLC] Absorption toward Sagittarius B2

Discussion

Member takes

Implication

Key Points

Cite This Study

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