Neutral hydrogen absorption in the nucleus of NGC3079

A. Pedlar; C. G. Mundell; J. F. Gallimore; S. A. Baum; C. P. O'Dea

doi:10.1016/0083-6656(95)00108-5

Neutral hydrogen absorption in the nucleus of NGC3079

A. Pedlar, C. G. Mundell, J. F. Gallimore, S. A. Baum, C. P. O'Dea

Department of Physics

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13 Citations (SciVal)

Abstract

We present subarcsecond MERLIN 21cm neutral hydrogen absorption line measurements of a 4 x 3 arcseconds (300 x 200 pc) region associated with the active nucleus of the Sc galaxy NGC3079. Broad (200-400 km s^-1) and deep (τ ∼ 0.5-1) absorption is seen over much of the region, corresponding to column densities as high as 3 × 10²² atoms cm^-2. The absorption shows a velocity gradient which could be consistent with rotation about a central mass of ∼ 10⁹M_⊙, however significant non-circular motions are also present which may be due to gas motions in a non-axisymetric potential.

Original language	English
Pages (from-to)	91-95
Number of pages	5
Journal	Vistas in Astronomy
Volume	40
Issue number	1
DOIs	https://doi.org/10.1016/0083-6656(95)00108-5
Publication status	Published - 1 Jan 1996

ASJC Scopus subject areas

Astronomy and Astrophysics

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10.1016/0083-6656(95)00108-5

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title = "Neutral hydrogen absorption in the nucleus of NGC3079",

abstract = "We present subarcsecond MERLIN 21cm neutral hydrogen absorption line measurements of a 4 x 3 arcseconds (300 x 200 pc) region associated with the active nucleus of the Sc galaxy NGC3079. Broad (200-400 km s-1) and deep (τ ∼ 0.5-1) absorption is seen over much of the region, corresponding to column densities as high as 3 × 1022 atoms cm-2. The absorption shows a velocity gradient which could be consistent with rotation about a central mass of ∼ 109M⊙, however significant non-circular motions are also present which may be due to gas motions in a non-axisymetric potential.",

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T1 - Neutral hydrogen absorption in the nucleus of NGC3079

AU - Pedlar, A.

AU - Mundell, C. G.

AU - Gallimore, J. F.

AU - Baum, S. A.

AU - O'Dea, C. P.

PY - 1996/1/1

Y1 - 1996/1/1

N2 - We present subarcsecond MERLIN 21cm neutral hydrogen absorption line measurements of a 4 x 3 arcseconds (300 x 200 pc) region associated with the active nucleus of the Sc galaxy NGC3079. Broad (200-400 km s-1) and deep (τ ∼ 0.5-1) absorption is seen over much of the region, corresponding to column densities as high as 3 × 1022 atoms cm-2. The absorption shows a velocity gradient which could be consistent with rotation about a central mass of ∼ 109M⊙, however significant non-circular motions are also present which may be due to gas motions in a non-axisymetric potential.

AB - We present subarcsecond MERLIN 21cm neutral hydrogen absorption line measurements of a 4 x 3 arcseconds (300 x 200 pc) region associated with the active nucleus of the Sc galaxy NGC3079. Broad (200-400 km s-1) and deep (τ ∼ 0.5-1) absorption is seen over much of the region, corresponding to column densities as high as 3 × 1022 atoms cm-2. The absorption shows a velocity gradient which could be consistent with rotation about a central mass of ∼ 109M⊙, however significant non-circular motions are also present which may be due to gas motions in a non-axisymetric potential.

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SP - 91

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Neutral hydrogen absorption in the nucleus of NGC3079

Abstract

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