Broad HI absorption in the candidate binary black-hole 4C37.11 (B2 0402+379)

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The Hi absorption in 4C37.11 is unusual because it is the first case where such broad absorption is found to be centred on the systemic velocity of the host galaxy and not asymmetric and blueshifted as is seen in all other galaxies with broad Hi absorption. Given the large width of the absorption, we suggest that a possible explanation for the extreme properties of the Hi absorption is that it is the kinematic signature of a binary black hole. If this interpretation is correct, the combined black hole mass derived from the absorption profile is consistent with that derived from the luminosity of the spheroid. If the broad absorption is indeed due to a binary black hole, this finding confirms the importance of the gaseous component in the merging process of supermassive black holes.
Originele taal-2English
Aantal pagina's4
TijdschriftAstronomy and astrophysics
Volume496
Nummer van het tijdschrift2
DOI's
StatusPublished - 2009

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