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Scaling of the photon index vs. mass accretion rate correlation and estimate of black hole mass in M101 ULX-1статья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 марта 2016 г.
- Авторы: Titarchuk Lev, Seifina Elena
- Журнал: Astronomy and Astrophysics
- Том: 585
- Год издания: 2016
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Первая страница: A94
- DOI: 10.1051/0004-6361/201526122
- Аннотация: We report the results of Swift and Chandra observations of an ultraluminous X-ray source, ULX-1 in M101. We show strong observational evidence that M101 ULX-1 undergoes spectral transitions from the low/hard state to the high/soft state during these observations. The spectra of M101 ULX-1 are well fitted by the so-called bulk motion Comptonization (BMC) model for all spectral states. We have established the photon index (\Gamma) saturation level, \Gamma_sat=2.8±0.1, in the /Gamma versus mass accretion rate (Ṁ) correlation. This \Gamma-Ṁ correlation allows us to evaluate black hole (BH) mass in M101 ULX-1 to be M_BH~(3.2−4.3)x10^4 Mͽ , assuming the spread in distance to M101 (from 6.4±0.5 Mpc to 7.4±0.6 Mpc). For this BH mass estimate we apply the scaling method, using Galactic BHs XTE J1550-564, H 1743-322 and 4U 1630-472 as reference sources. The \Gamma vs. Ṁ correlation revealed in M101 ULX-1 is similar to that in a number of Galactic BHs and clearly exhibits the correlation along with the strong index saturation at ≈2.8. This is robust observational evidence for the presence of a BH in M101 ULX-1. We also find that the seed (disk) photon temperatures are low, on the order of 40 - 100 eV, which is consistent with high BH mass in M101 ULX-1. Thus, we suggest that the central object in M101 ULX-1 has intermediate BH mass on the order of 10^4 solar masses.
- Добавил в систему: Сейфина Елена Викторовна
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | 26122_am_TS15_Astron_Astrophys.pdf | 26122_am_TS15_Astron_Astrophys.pdf | 892,9 КБ | 31 октября 2015 [seif11] |