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Astronomy and Astrophysics
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Monthly Notices of the Royal Astronomical Society
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Effects of the variability of the nucleus of NGC 1275 on X-ray observations of the surrounding intracluster medium
DOI: 10.1093/mnras/stv1134 Bibcode: 2015MNRAS.451.3061F

Fabian, A. C.; Pinto, C.; Russell, H. R. +2 more

The active galaxy NGC 1275 lies at the centre of the Perseus cluster of galaxies, which is the X-ray brightest cluster in the Sky. The nucleus shows large variability over the past few decades. We compile a light curve of its X-ray emission covering about 40 years and show that the bright phase around 1980 explains why the inner X-ray bubbles were…

2015 • Monthly Notices of the Royal Astronomical Society
XMM-Newton Exosat 33
Signature of the presence of a third body orbiting around XB 1916-053
DOI: 10.1051/0004-6361/201526500 Bibcode: 2015A&A...582A..32I

Sanna, A.; Romano, P.; Di Salvo, T. +9 more

Context. The ultra-compact dipping source XB 1916-053 has an orbital period of close to 50 min and a companion star with a very low mass (less than 0.1 M⊙). The orbital period derivative of the source was estimated to be 1.5(3) × 10-11 s/s through analysing the delays associated with the dip arrival times o…

2015 • Astronomy and Astrophysics
XMM-Newton Exosat INTEGRAL 17