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천문우주과학 연구동향

천문우주과학과 관련된 국내외 상위 학술논문 및 특허 정보를 제공해 드립니다.

NGC 4151 위치한 초거대 블랙홀까지 측정가능한 먼지-시차 거리 측정법

A dust-parallax distance of 19megaparsecs to the supermassive black hole in NGC 4151
  • 작성자 : KASI
  • 작성일 : 2014-12-01
  • 조회수 : 3226
  • 저자Sebastian F. Ho¨nig, Darach Watson et al.
  • Absract

     

    The active galaxyNGC4151 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. Unfortunately, effective calibration requires accurate knowledge of the distance to NGC4151, which is not at present available. Recently reported distances range from4 to 29megaparsecs. Strongpeculiarmotionsmake a redshift-based distance very uncertain, and the geometry of the galaxy and its nucleus prohibit accuratemeasurements using other techniques.Here wereport a dust-parallax distance toNGC4151 of 19:0z2:4{2:6 megaparsecs. The measurement is based on an adaptation of a geometric method that uses the emission line regions of active galaxies. 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 as determined from time delays and infrared interferometry. This distance leads to an approximately 1.4-fold increase in the dynamical black hole mass, implying a corresponding correction toemission line reverberationmasses of black holes if they are calibrated against the two objects with additional dynamical masses.


  • 게재정보Nature(2014.11.27)에 게제된 논문임
  • 첨부파일
  • 원 문http://www.nature.com/nature/journal/v515/n7528/pdf/nature13914.pdf
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