Abstract
DE YOUNG, Roberts and Saslaw1 detected H I absorption in NGC1275 with a velocity of 8,120 km s−1. This is ∼ 3,000 km s−1 larger than the systemic velocity of NGC1275 and is the same as that of the enigmatic system of gas filaments extending 40″ from the nucleus2,3. The observations of De Young et al. were made with a single dish with insufficient angular resolution to determine, which of the various radio continuum sources were being absorbed. They argue that the absorption is probably occurring in the components < 0.2″ rather than in the 5′ halo component, but they were unaware of an intermediate scale 30″ component4. Here we present observations made with sufficient angular resolution to decide unambiguously between these possibilities. Our data can also be used to place a limit on the H I mass of possible foreground objects which could be causing the absorption.
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References
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EKERS, R., VAN DER HULST, J. & MILEY, G. The 21-cm absorption line in NGC1275. Nature 262, 369–370 (1976). https://doi.org/10.1038/262369a0
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DOI: https://doi.org/10.1038/262369a0
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