Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-19
Astronomy and Astrophysics
Astrophysics
7 pages, 7 figures. Accepted for publication in A&A (Research Note)
Scientific paper
10.1051/0004-6361:20053882
Mrk 705 exhibits optical properties of both narrow- and broad-line Seyfert 1 galaxies. We examine the X-ray properties of this borderline object utilising proprietary and public data from Chandra, ASCA, ROSAT and RXTE, spanning more than twelve years. Though long-term flux variability from the pointed observations appears rather modest (about 3 times), we do find examples of rare large amplitude outbursts in the RXTE monitoring data. There is very little evidence of long-term spectral variability as the low- and high-energy spectra appear constant with time. A 6.4 keV emission line is detected in the ASCA spectra of Mrk 705, but not during the later, higher flux state Chandra observation. However, the upper limit on the equivalent width of a line in the Chandra spectrum is consistent with a constant-flux emission line and a brighter continuum, suggesting that the line is emitted from distant material such as the putative torus. Overall, the X-ray properties of Mrk 705 appear typical of BLS1 activity.
Balestra Italo
Boller Th.
Burwitz Vadim
Costantini Elisa
Ferrero Elisa
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