Spectral evolution of an ultraluminous compact X-ray source in NGC 253

Takaaki Tanaka, Masahiko Sugiho, Aya Kubota, Kazuo Makishima, Tadayuki Takahashi

Research output: Contribution to journalArticle


We report an observational result for a ULX in NGC253. We find that the spectral evolution is well consistent with the standard behavior. That is, the source satisfies the relation Ldisk ∝ Tin 4 as established for black hole binaries. By comparing with black hole binaries, we estimate black hole mass of this ULX as 7M⊙.

Original languageEnglish
Pages (from-to)427-428
Number of pages2
JournalProgress of Theoretical Physics Supplement
Publication statusPublished - 2004
Externally publishedYes


ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this