Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...600...52h&link_type=abstract
The Astrophysical Journal, Volume 600, Issue 1, pp. 52-58.
Astronomy and Astrophysics
Astronomy
2
Galaxies: Interactions, Galaxies: Starburst, Galaxies: Quasars: Absorption Lines, Galaxies: Quasars: Individual: Alphanumeric: Q0248+430, Radio Lines: Galaxies
Scientific paper
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 (zem=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 1.5×1.5h-1kpc the H2 mass based on the traditional conversion factor is ~1010 Msolar, 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 6×108Msolar. 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.
Chiou Shwu-Huey
Hwang Chorng-Yuan
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