Swift/XRT follow-up observations of INTEGRAL/IBIS AGN candidates

ATel #1288; R. Landi, N. Masetti, J. B. Stephen (INAF/IASF Bologna), A. De Rosa, F. Capitanio (INAF/IASF Rome), M. Molina, A. J. Dean (Univ. Southampton), J. Tueller (NASA/GSFC), Perri (ASDC), J. A. Kennea (PSU)
on 19 Nov 2007; 15:01 UT
Credential Certification: Raffaella Landi (landi@iasfbo.inaf.it)

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We report on X-ray follow-up observations performed with Swift/XRT of five INTEGRAL candidate AGNs belonging to the 3rd IBIS Survey Catalogue (Bird et al. 2007, ApJS, 170, 175).

IGR J11366-6002
Within the IBIS uncertainty, we find a source at RA(J2000) = 11h 36m 42.09s and Dec(J2000) = -60d 03m 07.8s (3.7 arcsec uncertainty). This source is associated with the 2MASS extended source 2MASX J11364205-6003070, also detected by XMM-Newton (XMMSL1 J113642.1-600310) and ROSAT (1RXS J113641.2-600238) and classified as a galaxy in NED. The X-ray data are well described with an absorbed (N_H ~10²² cm^-2) power law having photon index ~2 and an observed 2-10 keV flux of 4.6 x 10^-12 erg cm^-2 s^-1.

IGR J16024-6107
Within the IBIS uncertainty, we detect a source located at RA(J2000) = 16h 01m 48.40s and Dec(J2000) = -61d 08m 53.6s (4.5 arcsec uncertainty). This source coincides with the ROSAT Bright Survey object (1RXS J160146.4-610910), associated in NED with the galaxy WKK 5694 at redshift z = 0.0114. The X-ray spectroscopy indicates an unabsorbed steep spectrum (Gamma ~2.5); the 2-10 keV flux is ~1.8 x 10^-12 erg cm^-2 s^-1.

IGR J19405-3016
The XRT observation locates the source at RA(J2000) = 19h 40m 15.15s and Dec(J2000) = -30d 15m 48.5s (3.5 arcsec uncertainty). This source has also counterparts in the ROSAT Bright Survey (1RXS J194015.0-301552) and in the SUMMS survey (SUMSS J194015-301551); it is also associated with the 2MASS extended source 2MASX J19401507-3015522, classified as a galaxy in NED. The X-ray spectrum is well modelled with an unabsorbed power law having photon index ~2.1 and a 2-10 flux of 1.1 x 10^-12 erg cm^-2 s^-1.

IGR J22292+6647
We find, within the IBIS uncertainty, a source located at RA(J2000) = 22h 29m 13.50s and Dec(J2000) = +66d 46m 51.8s (3.6 arcsec uncertainty). This source is associated with a strong radio source, 87GB 222741.2+663124, classified as an asymmetric double in NED; it has already been detected in X-rays by XMM-Newton (XMMSL1 J222914.2+664653) and by ROSAT (1RXS J222915.7+664704). The radio characteristics (strong emission and morphology) together with its location above the galactic plane (l > 7 degrees) suggest an extragalactic nature. The X-ray spectrum is well fitted with a slightly absorbed (N_H ~2 x 10²¹ cm^-2) power law having a photon index ~1.8 and an observed 2-10 keV flux of 5.5 x 10^-12 erg cm^-2 s^-1.

IGR J23308+7120
Within the IBIS error box, a source is located at RA(J2000) = 23h 30m 37.25s and Dec(J2000) = +71d 22m 44.8s (4.1 arcsec uncertainty). This source is associated with the galaxy 2MASX J23303771+7122464 positionally coincident with the radio source NVSS J233038+712246. The X-ray spectrum is best fitted with an absorbed (N_H ~6 x 10²² cm^-2) power law (Gamma = 1.8 fixed) having an observed 2-10 keV flux of 1.4 x 10^-12 erg cm^-2 s^-1.