The awakening of the γ-ray narrow-line Seyfert 1 galaxy PKS 1502+036
نویسندگان
چکیده
منابع مشابه
X - ray variability of the Narrow Line Seyfert 1 Galaxy PKS 0558 − 504
We present results from several XMM-Newton observations of the radio loud Narrow-line Seyfert 1 galaxy (NLS1) PKS 0558-504. We find evidence for strong and persistent X-ray variability, both on short and long timescales. On short time scales of > ∼ 2 hours the source varies smoothly by 15−20%; long term variations by a factor > ∼ 2 could not be resolved in the relatively short exposures: we fin...
متن کاملHow the X-ray spectrum of a Narrow-Line Seyfert 1 galaxy may be reflection dominated
A model for the inner regions of accretion flows is presented where, due to disc instabilities, cold and dense material is clumped into deep sheets or rings. Surrounding these density enhancements is hot, tenuous gas where coronal dissipation processes occur. We expect this situation to be most relevant when the accretion rate is close to Eddington and the disc is radiation-pressure dominated, ...
متن کاملX - ray absorption in the strong FeII narrow - line Seyfert 1 galaxy Markarian 507
We present results from spectral analysis of ASCA data on the strong Feii narrow-line Seyfert 1 galaxy Mrk 507. This galaxy was found to have an exceptionally flat ROSAT spectrum among the narrow-line Seyfert 1 galaxies (NLS1s) studied by Boller, Brandt & Fink (1996). The ASCA spectrum however shows a clear absorption feature in the energy band below 2 keV, which partly accounts for the flat sp...
متن کاملDiscovery of a Narrow-Line Seyfert 1 galaxy
We have discovered a Narrow-Line Seyfert 1 (NLS1) galaxy and identified it with an ultrasoft X-ray source (RX 215319-1514) detected with ROSAT . We present its X-ray and optical spectral characteristics. Its redshift is found to be 0.0778±0.0002. Its optical spectrum shows fairly strong Fe II emission lines, and its X-ray spectrum has an extremely steep power-law index of Γ ≥4, making it an ext...
متن کاملSpectacular Narrow - Line Seyfert 1 Galaxy with Young Post - starburst
We analyze the physical properties of post-starburst AGN SDSS J085338.27+033246.1 according to its optical spectrum and discuss its implications on AGN's evolution. The spectra PCA method is developed to extract emission lines and absorption features from the total light spectrum. The emission-line analysis indicates that the object can be classified as a NLS1 with FeII/Hβ B = 2.4 ± 0.2, large ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2016
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stw2325