Neutral hydrogen absorption in NGC 1068 and NGC 3079

Details Neutral hydrogen absorption in NGC 1068 and NGC 3079 Neutral hydrogen absorption in NGC 1068 and NGC 3079

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...422l..13g&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 422, no. 1, p. L13-L16

Astronomy and Astrophysics

Astrophysics

40

Galactic Radiation, Galaxies, Hydrogen, Seyfert Galaxies, Stellar Evolution, Stellar Motions, Absorption Spectra, Galactic Radio Waves, Moment Distribution, Very Large Array (Vla)

Scientific paper

We have used the Very Large Array (VLA) in A configuration to obtain spatially resolved 21 cm absorption spectra of NGC 1068 and NGC 3079. The bulk of the absorbing H I in NGC 1068 appears to be located in the inner disk and is oriented such that the brighter, northeast radio lobe is located in front of the disk and the fainter, southwest radio lobe is located behind. We find evidence for a shock front inside the leading edge of the stellar bar based on the kinematics and column density distribution of the H I. Near the radio nucleus of NGC 1068 the H I appears to be participating in a wind-driven outflow. In NGC 3079 we detect slightly resolved H I absorption against the radio core. This absorption is characterized by strong, multiple components: (1) broad absorption (FWZI approximately greater than 895 km/s) with a deep core near the systemic velocity and a slight blue asymmetry, and (2) red- and blueshifted components which are slightly resolved by the VLA beam. These Doppler-shifted components might arise in a wind-driven outflow or a slightly resolved circumnuclear ring (approximately 90 pc radius). Assuming circular orbits, the virial mass interior to the alleged ring would exceed 108 solar mass.

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