[ Previous | Next | ADS ]

Swift/XRT follow-up observations of INTEGRAL detected AGN

ATel #1274; R. Landi, A. Malizia, N. Masetti (INAF/IASF Bologna), A. De Rosa, S. Gianni' (INAF/IASF Rome), A. J. Dean, M. Molina (Univ. Southampton), N. Gehrels, J. Tueller (NASA/GSFC), P. Giommi (ASDC), J. A. Kennea (PSU)
on 13 Nov 2007; 14:39 UT
Credential Certification: Raffaella Landi (landi@iasfbo.inaf.it)

Subjects: X-ray, Gamma Ray, AGN

We report on X-ray follow-up observations performed with Swift/XRT of six INTEGRAL detected AGN belonging to the 3rd IBIS Survey Catalogue (Bird et al. 2007, ApJS. 170, 175). In all cases, the XRT position confirms a previously reported association with an active galaxy.

IGR J00040+7020
Within the IBIS uncertainty, we find a source located at RA(J2000) = 00h 04m 01.53s and Dec(J2000) = +70d 19m 16.5s (3.7 arcsec uncertainty). This position confirms the association of IGR J00040+7020 with the galaxy 2MASX J00040192+7019185 classified as a Seyfert 2 (Masetti et al. 2007, Atel 957).The X-ray data analysis provides as best-fit an absorbed (NH ~3 x 1022 cm-2) power law spectrum (Gamma ~1.6) with an observed 2-10 keV flux of ~4.2 x 10-12 erg cm-2 s-1.

IGR J00256+6821
The IBIS error box contains an X-ray source located at RA(J2000) = 00h 25m 31.42s and Dec(J2000) = +68d 21m 41.3s (4.4 arcsec uncertainty). This source coincides with the previously reported counterpart, LEDA 136991, a double nuclei galaxy in which the western nucleus is a Seyfert 2 AGN (Masetti et al. 2006, Atel 941). The X-ray data are best modelled with an absorbed (NH ~4 x 1023 cm-2) power law (Gamma = 1.8 fixed) having an observed 2-10 keV flux of 5 x 10-13 erg cm-2 s-1.

IGR J01528-0326
The IBIS positional uncertainty contains a source at RA(J2000) = 01h 52m 48.9s and Dec(J2000) = -03d 26m 50.96, with an error box of 3.9 arcsec. This source coincides with the edge on spiral galaxy MCG-01-05-047, classified as a Seyfert 2 galaxy by Burenin et al. (2007, Atel 883). The X-ray spectrum is indeed typical of a type 2 AGN being well described by an absorbed (NH ~1.4 x 1023 cm-2) power law (Gamma = 1.8 fixed) having an observed 2-10 keV flux of 4 x 10-12 erg cm-2 s-1.

IGR J02504+5443
Within the IBIS error box, we find an X-ray source located at RA(J2000) = 02h 50m 41.8s and Dec(J2000) = +54d 42m 15.1s (6 arcsec uncertainty). This source coincides with the radio-emitting galaxy LEDA 166445, classified as a Seyfert 2 AGN (Masetti et al. 2007, Atel 957). From the X-ray data we can only infer a 2-10 keV flux of 4.8 x 10-12 erg cm-2 s-1, by adopting a canonical AGN spectrum (Gamma = 1.8).

IGR J16056-6110
Within the IBIS error box an X-ray source is detected at RA(J2000) = 16h 05m 51.44s and Dec(J2000) = -61d 11m 42.9s (4 arcsec uncertainty). This confirms the previous association with the galaxy LEDA 3079933 = WKK 5838 classified as a Seyfert 1.5 (Masetti et al. 2007, Atel 1033). The X-ray spectroscopy indicates an unabsorbed power law spectrum (Gamma ~1.8) with a 2-10 keV flux of 1.4 x 10-12 erg cm-2 s-1.

IGR J16119-6036
An X-ray source is detected within the IBIS error box at the following position: RA(J2000) = 16h 11m 51.36s and Dec(J2000) = -60d 37m 53.1s (3.8 arcsec uncertainty). This position clearly associate the source to the Seyfert 1 galaxy WKK 6092 (Bassani et al. 2006, ApJ, 636, L65, see also Woudt et al. 1998, A&A, 338, 8). The X-ray spectrum is described with an unabsorbed power law having photon index of ~1.9 and a 2-10 keV flux of 3 x 10-12 erg cm-2 s-1.