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- Eötvös Loránd UniversityHU162 papers
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4 papers · 1 filter
Host galaxy magnitude of OJ 287 from its colours at minimum light
Mauri J. Valtonen, Lankeswar Dey, S. Zola +54
OJ 287 is a BL Lacertae type quasar in which the active galactic nucleus (AGN) outshines the host galaxy by an order of magnitude. The only exception to this may be at minimum ligh…
The Transient Ultra-luminous X-ray Source, ULX-4, in M51
S. Allak, A. Akyuz, İ. Akkaya Oralhan +6
We present the results of a temporal and spectral analysis of the transient source ULX-4 in the galaxy M51. The data used were drawn from Chandra, XMM-Newton and Swift-XRT archives…
X-ray Sources in the Dwarf Spheroidal Galaxy Draco
E. Sonbas, B. Rangelov, O. Kargaltsev +3
We present the spectral analysis of an 87~ks \emph{XMM-Newton} observation of Draco, a nearby dwarf spheroidal galaxy. Of the approximately 35 robust X-ray source detections, we fo…
A Search For Supernova Remnants in The Nearby Spiral Galaxy M74 (NGC 628)
E. Sonbas, A. Akyuz, S. Balman +1
We have identified nine new SNR candidates in M74 with [S II]/H 0.4 as the basic criterion. We obtain [S II]/H ratio in the range from 0.40 to 0.91 and H intensitie…