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- Title
Suzaku confirms NGC 3660 is an unabsorbed Seyfert 2.
- Authors
RIVERS, Elizabeth; BRIGHTMAN, Murray; BIANCHI, Stefano; MATT, Giorgio; NANDRA, Kirpal; Yoshihiro UEDA
- Abstract
An enigmatic group of objects, unabsorbed Seyfert 2s may have intrinsically weak broad line regions, obscuration in the line of sight to the BLR but not to the X-ray corona, or so much obscuration that the X-ray continuum is completely suppressed and the observed spectrum is actually scattered into the line of sight from nearby material. NGC 3660 has been shown to have weak broad optical/near-infrared lines, no obscuration in the soft X-ray band, and no indication of "changing look" behavior. The only previous hard X-ray detection of this source by Beppo-SAX seemed to indicate that the source might harbor a heavily obscured nucleus. However, our analysis of a long-look Suzaku observation of this source shows that this is not the case, and that this source has a typical power-law X-ray continuum with normal reflection and no obscuration. We conclude that NGC 3660 is confirmed to have no unidentified obscuration and that the anomolously high Beppo- SAX measurement must be due to source confusion or similar, being inconsistent with our Suzaku measurements as well as non-detections from Swift-Burst Alert Telescope (BAT) and Rossi X-ray Timing Explorer (RXTE).
- Subjects
STELLAR corona; ASTRONOMICAL observations; GALAXIES; GALACTIC nuclei; BLACK holes
- Publication
Publications of the Astronomical Society of Japan, 2016, Vol 68, Issue supp1, pS24-1
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psv137