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Swift J164449.3+573451 and Swift J2058.4+0516: Black hole mass estimates for tidal disruption event sourcesстатья
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: 19 декабря 2017 г.
- Авторы: Seifina Elena, Titarchuk Lev, Virgilli Enrico
- Журнал: Astronomy and Astrophysics
- Том: 607
- Год издания: 2017
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Первая страница: 38
- Последняя страница: 52
- DOI: 10.1051/0004-6361/201730869
- Аннотация: A tidal disruption event (TDE) is an astronomical phenomenon in which a previously dormant black hole (BH) destroys a star passing too close to its central part. We analyzed the flaring episode detected from the TDE sources, Swift J164449.3+573451 and Swift J2058.4+0516 (hereafter Swift J1644+57 and Swift J2058+05, respectively) using RXTE, Swift and Suzaku data. The spectra are well fitted by the so called Bulk Motion Comptonization model for which the best-fit photon index Г varies from 1.1 to 1.8. We have firmly established the saturation of the photon index versus mass accretion rate at Г_sat about 1.7 – 1.8. The saturation of Г is usually identified as a signature of a BH now established in Swift J1644+57 and Swift J2058+05. In Swift J1644+57 we found the relatively low Г_sat values which indicate a high electron (plasma) temperature, kT_e ∼ 30 – 40 keV. This is also consistent with high cutoff energies, E_cut ∼ 60 – 80 keV found using best fits of the RXTE spectra. Swift J2058+05 shows a lower electron temperature, kT_e ∼ 4−10 keV than that for Swift J1644+57. For the BH mass estimate we used the scaling technique taking the Galactic BHs, GRO J1655–40, GX 339–4, Cyg X–1 and 4U 1543–47 as reference sources and found that the BH mass in Swift J1644+57 is MBH ≥ 7 × 10^6 M_⊙ assuming the distance to this source of 1.5 Gpc. For Swift J2058+05 we obtain MBH ≥ 2 × 10^7 M_⊙ assuming the distance to this source of 3.7 Gpc. We have also found that the seed (disk) photon temperatures are quite low, of order of 100 – 400 eV, in both of the sources, which are consistent with the estimated BH masses.
- Добавил в систему: Сейфина Елена Викторовна
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | aa30869-17.pdf | 1,6 МБ | 24 июля 2017 [seif11] |