Determination of the gas-to-dust ratio in nearby dense clouds using X-ray absorption measurements

By Myha Vuong, T. Montmerle, N. Grosso, Eric D. Feigelson, L. Verstraete, H. Ozawa. 2003

215 citations recorded by the source corpus.

We present a comparison of the gas and dust properties of the dense interstellar matter in six nearby star forming regions (d 2) than the galactic value, derived using the standard extinction curve (RV = 3:1). This result is consistent with the recent downwards revision of the metallicity of the Sun and stars in the solar vicinity. We find that the Oph dense cloud has the same metallicity than the local ISM when assuming that the galactic gas-to-dust ratio remains unchanged. The dierence between galactic and local values of the gas-to-dust ratio can thus be attributed entirely to a dierence in metallicity.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/67cad446479690d2dc6ed521a80d19fd141c8fdc

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In Astronomy and Astrophysics

Citations in the corpus

Chandra Orion Ultradeep Project: Observations and Source Lists (2004, methodology): “Derive an upper limit to the count rate as LimCt/Exp using Tables 11−12, calculate NH according to the formula NH(cm −2) ∼ AV (mag) × 1.6 × 1021 (Vuong et al. 2003), use PIMMS to compute the – 22 – unabsorbed flux from the count rates assuming an optically thin plasma spectrum with kT ∼ 1 keV.”
Observations of the Icy Universe (2015, unknown): “7 = 0.26AK (Boogert et al., 2013) and NH = 1.54 × 10 22AK (Vuong et al., 2003).”
Stellar Activity on the Young Suns of Orion: COUP Observations of K5-7 Pre-Main-Sequence Stars (2005, background): “In all but four cases, the optically derived visual absorptions AV agree with the X-ray-derived column densities log NH given the conversion NH ¼ 1:6 ; 1021AV cm 2 obtained by Vuong et al. (2003).”
AN IMPROVED DYNAMICAL MODEL FOR THE MICROQUASAR XTE J1550−564 (2011, methodology): “Vuong et al. (2003) have directly measured the relationship between X-ray absorption and NIR extinction using several young stellar objects embedded in the nearby molecular cloud ρ Ophiuchi.”
X-ray emission from T Tauri stars and the role of accretion: inferences from the XMM-Newton extended survey of the Taurus molecular cloud (2006, background): “The NH values found from our spectral fits are roughly consistent with the visual extinctions AV and the infrared extinctions AJ if we assume a standard gas-to-dust ratio (NH/AV = 2×1021 cm−2 mag−1, NH/AJ = 7.1×1021 cm−2 mag−1; Vuong et al. 2003).”