16 citations · 58 across the 8 of their papers we have counts for
8 papers
Exploring the nature of an ultraluminous X-ray source in NGC 628
Hasan Avdan, Senay Avdan
In this work, we study the X-ray spectral and temporal properties of an ultraluminous X-ray source (ULX) in NGC 628 by using multi-epoch archival X-ray data. The physical parameter…
Optical Counterparts of Two Candidate Ultraluminous X-ray Sources in NGC 4536
H. Avdan, E. Sonbas, K. S. Dhuga +7
Archival {\it XMM-Newton}, {\it Chandra} and {\it Hubble Space Telescope (HST)} data have been used to study the X-ray and optical properties of two candidate ultraluminous X-ray s…
Optical Counterparts of an Ultraluminous X-Ray Source X-1 in NGC 2500
N. Aksaker, A. Akyüz, S. Avdan +1
We present the results of a search for optical counterparts of ultraluminous X-ray source (ULX) X-1 in the nearby galaxy NGC 2500 by using archival images taken with the Hubble Spa…
Optical Counterparts of ULXs and Their Host Environments in NGC 4490/4485
Senay Avdan, Aysun Akyuz, Alexander Vinokurov +6
We report the identification of the possible optical counterparts of five out of seven Ultraluminous X-ray Sources (ULXs) in NGC 4490/4485 galaxy pair. Using archival Hubble Space…
X-ray spectral and optical properties of a ULX in NGC 4258 (M106)
Hasan Avdan, Senay Avdan, Aysun Akyuz +3
We study the X-ray and optical properties of the ultraluminous X-ray source (ULX) X-6 in the nearby galaxy NGC 4258 (M106) based on the archival {\it XMM-Newton}, {\it Chandra}, {\…
Optical counterparts of two ULXs in NGC5474 and NGC3627 (M66)
S. Avdan, A. Vinokurov, S. Fabrika +6
We identified two optical counterparts of brightest ultraluminous X-ray Sources (ULXs) in galaxies NGC5474 and NGC3627 (M66). The counterparts in Hubble Space Telescope images are…
A search for periodicities from a ULX in the LINER galaxy NGC 4736
H. Avdan, S. Kayaci Avdan, A. Akyuz +1
We report our findings on a new quasi-periodic oscillation (QPO) and a long period from the ultraluminous X-ray source (ULX) X-2 in nearby galaxy NGC 4736 based on the Chandra and…
XMM-Newton Observations of Luminous Sources in the Nearby Galaxies: NGC 4395, NGC 4736, and NGC 4258
A. Akyuz, S. Kayaci, H. Avdan +3
We present results from a study of the non-nuclear discrete sources in a sample of three nearby spiral galaxies (NGC 4395, NGC 4736, and NGC 4258) based on XMM-Newton archival data…