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Scaling of X-ray spectral properties of a black hole in the Seyfert 1 galaxy NGC 7469статья
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: 7 декабря 2018 г.
- Авторы: Seifina E., Titarchuk L., Ugolkova L.
- Журнал: Astronomy and Astrophysics
- Том: 619
- Год издания: 2018
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Первая страница: 21
- Последняя страница: 35
- DOI: 10.1051/0004-6361/201833169
- Аннотация: We present our analysis of X-ray spectral properties observed from the Seyfrert 1 galactic nucleus NGC 7469 using the Rossi X-ray Timing Explorer (RXTE) and Advanced Satellite for Cosmology and Astrophysics mission (ASCA) observations. We demonstrate strong observational evidence that NGC 7469 undergoes spectral transitions from the low hard state (LHS) to the intermediate state (IS) during these observations. The RXTE observations (1996–2009) show that the source was in the IS ∼ 75% of the time only ∼ 25% of the time in the LHS. The spectra of NGC 7469 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=2.1±0.1, in the \Gamma versus mass accretion rate, ˙M correlation. This \Gamma−˙M correlation allows us to estimate the black hole (BH) mass in NGC 7469 to be M_BH≥3×10^6 M_⊙ assuming the distance to NGC 7469 of 70 Mpc. For this BH mass estimate, we use the scaling method taking Galactic BHs, GRO J1655–40, Cyg X–1, and an extragalactic BH source, NGC 4051 as reference sources. The \Gamma versus ˙M correlation revealed in NGC 7469 is similar to those in a number of Galactic and extragalactic BHs and it clearly shows the correlation along with the strong \Gamma-saturation at ≈ 2.1. This is robust observational evidence for the presence of a BH in NGC 7469. We also find that the seed (disk) photon temperatures are quite low, of the order of 140−200 eV, which are consistent with a high BH mass in NGC 7469 that is more than 3×10^6 solar masses.
- Добавил в систему: Сейфина Елена Викторовна
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | полный текст | aa33169-18.pdf | 1000,7 КБ | 20 августа 2018 [seif11] |