SIMBAD references

2014ApJ...785...22M - Astrophys. J., 785, 22 (2014/April-2)

Hydrogen fluoride toward luminous nearby galaxies: NGC 253 and NGC 4945.

MONJE R.R., LORD S., FALGARONE E., LIS D.C., NEUFELD D.A., PHILLIPS T.G. and GUSTEN R.

Abstract (from CDS):

We present the detection of hydrogen fluoride (HF) in two luminous nearby galaxies, NGC 253 and NGC 4945 using the Heterodyne Instrument for the Far-Infrared on board the Herschel Space Observatory. The HF line toward NGC 253 has a P-Cygni profile, while an asymmetric absorption profile is seen toward NGC 4945. The P-Cygni profile in NGC 253 suggests an outflow of molecular gas with a mass of M(H2)out∼ 1x107 M and an outflow rate as large as {dotM} ∼6.4 M/yr. In the case of NGC 4945, the axisymmetric velocity components in the HF line profile are compatible with the interpretation of a fast-rotating nuclear ring surrounding the nucleus and the presence of inflowing gas. The gas falls into the nucleus with an inflow rate of ≤ 1.2 M/yr, inside an inner radius of ≤ 200 pc. The gas accretion rate to the central active galactic nucleus is much smaller, suggesting that the inflow may be triggering a nuclear starburst. From these results, the HF J = 1-0 line is seen to provide an important probe of the kinematics of absorbing material along the sight-line to nearby galaxies with bright dust continuum and a promising new tracer of molecular gas in high-redshift galaxies.

Abstract Copyright:

Journal keyword(s): astrochemistry - submillimeter: ISM - ISM: abundances - ISM: molecules

Simbad objects: 9

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2020.01.18-10:36:06

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