B2 0954+25A: a typical Fermi blazar or a gamma-loud Narrow Line Seyfert 1

Дата и время публикации : 2012-02-16T21:00:14Z

Авторы публикации и институты :
G. Calderone
G. Ghisellini
M. Colpi
M. Dotti

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: MNRAS accepted. 14 pages, 6 figures
Первичная категория: astro-ph.HE

Все категории : astro-ph.HE, astro-ph.CO

Краткий обзор статьи: B2 0954+25A, detected by the {it Fermi} satellite, is a blazar with interesting observational properties: it has been observed to transit from a jet dominated to a disk dominated state; its radio spectrum appears flat at all observing frequencies (down to 74 MHz); optically, the H$beta$ line profile is asymmetric. The flatness of radio spectrum suggests that the isotropic emission from radio lobes is very weak, despite the large size of its jet ($gtrsim$ 500 kpc). Its broad–band spectral energy distribution is surprisingly similar to that of the prototypical $gamma$–ray, radio loud, Narrow Line Seyfert 1 ($gamma$–NLS1) galaxy PMN J0948+0022. In this work we revisit the mass estimates of B2 0954+25A considering only the symmetric component of the H$beta$ line and find (1–3) $times 10^8$ M$_{sun}$. In light of our composite analysis, we propose to classify the source as a transition object between the class of Flat Spectrum Radio Quasar and $gamma$–ray, radio loud NLS1. A comparison with two members of each class (3C 273 and PMN J0948+0022) is discussed.

Category: Physics