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Swift/XRT observations confirm the AGN nature of IGR J14175-4641, IGR J14552-5133 and IGR J16351-5806

ATel #990; R. Landi (INAF/IASF Bologna), N. Masetti (INAF/IASF Bologna), N. Gehrels (NASA/GSFC), M. Perri (ASDC), M. Molina (Univ. Southampton), and A. De Rosa (INAF/IASF Rome)
on 7 Feb 2007; 16:04 UT
Credential Certification: Raffaella Landi (landi@iasfbo.inaf.it)

Subjects: X-ray, Gamma Ray, AGN, Star

Three INTEGRAL sources, IGR J14175-4641, IGR J14552-5133 and IGR J16351-5806 have recently been observed and detected with the Swift/XRT X-ray telescope. In all cases, the XRT position confirms a previous association with 3 AGNs (Masetti et al., 2006, A&A, 459, 21; Kuiper et al., 2006, Atel 684). In the following we report the results of these measurements:

IGR J14175-4641
The XRT observation locates the source at RA(J2000) = 14h17m03.8s and Dec(J2000) = -46d41m39.7s, with an error box of 10 arcsec, thus confirming the association with the Seyfert 2 galaxy LEDA 511869 at z = 0.076; the source is too weak to allow spectral analysis, but the 2-10 keV XRT flux of 5.8 x 10-14 erg cm-2 s-1, compared with the 20-100 keV IBIS flux of 3.9 x 10-11 erg cm-2 s-1, suggests that this may be a Compton thick AGN.

IGR J14552-5133
The XRT observation locates the source at RA(J2000) = 14h55m17.93s, Dec(J2000) = -51d34m13.27s, with an error box of 3.32 arcsec, thus confirming the association with the Narrow Line Seyfert 1 galaxy WKK4438 at z = 0.016; the X-ray spectroscopy indicates a mildly absorbed power law spectrum (Gamma = 2.06 and NH = 1.2 x 1021 cm-2) with a 2-10 keV flux of 9 x 10-12 erg cm-2 s-1.

IGR J16351-5806
The XRT observation locates the source at RA(J2000) = 16h35m13.17s, Dec(J2000) = -58d04m49.68s, with an error box of 5.1 arcsec, thus confirming the association with the Seyfert 2 galaxy ESO 137-34 at z = 0.009. The X-ray spectrum (although of low statistical quality) is compatible with an unabsorbed steep (Gamma = 2.3) power law with a 2-10 keV flux of 2.4 x 10-13 erg cm-2 s-1.