An X-ray view of Mrk 705: A borderline narrow-line Seyfert 1 galaxy

Abstract

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.

7 pages, 7 figures. Accepted for publication in A&A (Research Note)

References in corpus (4)

• XMM-Newton EPIC observations of 21 low-redshift PG quasars
• An Expanded RXTE Survey of X-ray Variability in Seyfert 1 Galaxies
• Black hole growth by accretion
• Type 2 counterparts of narrow-line Seyfert 1 galaxies

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• Exploring the physics of the accretion and jet in nearby narrow-line Seyfert 1 galaxies