A dust-parallax distance of 19 megaparsecs to the supermassive black hole in NGC 4151

Article

关键词: ACTIVE GALACTIC NUCLEI;    BROAD-LINE REGION;    INNER RADIUS;    NARROW-LINE;    REVERBERATION;    KINEMATICS;    SCALE;    MASS;    CIRCUMNUCLEAR;    EMISSION;   

DOI  :  10.1038/nature13914

来源: SCIE

【 摘 要 】

The active galaxy NGC 4151 has a crucial role as one of only two active galactic nuclei for which black hole mass measurements based on emission line reverberation mapping can be calibrated against other dynamical techniques(1-3). Unfortunately, effective calibration requires accurate knowledge of the distance to NGC 4151, which is not at present available(4). Recently reported distances range from 4 to 29 megaparsecs(5-7). Strong peculiar motions make a redshift-based distance very uncertain, and the geometry of the galaxy and its nucleus prohibit accurate measurements using other techniques. Here we report a dust-parallax distance to NGC 4151 of 19.0+(+2.4)(-2.6) megaparsecs. The measurement is based on an adaptation of a geometric method that uses the emission line regions of active galaxies(8). Because these regions are too small to be imaged with present technology, we use instead the ratio of the physical and angular sizes of the more extended hot-dust emission(9) as determined from time delays(10) and infrared interferometry(11-14). This distance leads to an approximately 1.4-fold increase in the dynamical black hole mass, implying a corresponding correction to emission line reverberation masses of black holes if they are calibrated against the two objects with additional dynamical masses.

【 授权许可】

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