A new H I 21 centimeter absorber associated with the H I deficient interacting galaxies G0248+430

Chorng Yuan Hwang, Shwu Huey Chiou

研究成果: 雜誌貢獻期刊論文同行評審

10 引文 斯高帕斯(Scopus)


We present high-resolution (∼2″) H I 21 cm and CO(1-0) observations of the quasar (QSO) galaxy pair 0248+430. The QSO Q0248+430 (z em = 1.313) has been found to show two metal absorption-line systems at redshifts za ∼ 0.052, which are consistent with the redshift of a foreground luminous infrared galaxy 15″ (∼11 h-1 kpc) away. In our observations, the CO emission of this foreground galaxy, G0248+430, shows broad velocity distribution (∼173 km s-1) but is spatially confined to a small unresolved region less than 1.5 × 1.5 h -1 kpc; the H2 mass based on the traditional conversion factor is ≈1010 M, which is approximately 30 times the H2 mass within a similar region of the Milky Way. On the other hand, no significant H I 21 cm emission is found in the foreground galaxy; the mass of the neutral atomic hydrogen is less than 6 × 10 8 M. Toward the QSO we discover a new H I 21 cm absorber with τdv ∼ 0.26 km s-1 at the redshift of one of the metal absorption components; however, we did not detect significant CO(1-0) absorption toward the QSO. The H I column density is large enough for the absorber to be classified as a damped Lyα system. We also derive the H I mass and spin temperature for this metal-line absorption system. We discuss the relation of this H I absorber and the depletion of the H I in the foreground galaxy. We find that this H I absorber has very high metal abundance and is intrinsically different from the normal damped Lyα- absorption systems, although both have similar spin temperatures and hydrogen column densities.

頁(從 - 到)52-58
期刊Astrophysical Journal
發行號1 I
出版狀態已出版 - 1 1月 2004


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