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IGR J14557-5448 is likely an AGN

ATel #12840; F. Ursini, L. Bassani, A. Malizia, V. Sguera (INAF-OAS Bologna), A. Bazzano, P. Ubertini, M. Fiocchi (INAF-IAPS Rome), A. J. Bird (University of Southampton)
on 5 Jun 2019; 08:47 UT
Credential Certification: Francesco Ursini (francesco.ursini@inaf.it)

Subjects: X-ray, AGN

We use a public XMM-Newton observation (Obs.ID: 0803031501, date: 2018-02-09, net exposure: 8 ks) to search for the X-ray counterpart of IGR J14557-5448, a persistent and still unidentified source seen by INTEGRAL/IBIS (Bird et al. 2016, ApJS 223,15). Within the IBIS positional uncertainty (90% confidence level), we find one hard X-ray source (>10 sigma in the 7.5–12 keV band) at coordinates: RA(J2000) = 14:55:32.400, Dec(J2000) = -54:46:29.640 (90% uncertainty around 4 arcsec). The source has a radio counterpart (MGPS J145532-544629) and an AllWISE counterpart (J145532.03-544628.7), associated to the spiral galaxy 2MASX J14553197-5446291 (also WKK98 4442, Leda 415943, PGC 415943) of still unknown redshift: the radio flux is 33.4+/-1.4 mJy at 36 cm, while the infrared colours are W1-W2=0.81 and W2-W3=3.13, typical of AGNs (Secrest et al. 2015, ApJS 221,12).

Fitting the XMM-Newton spectrum (2–10 keV) jointly with the IBIS spectrum (20–200 keV) yields a hard photon index of 1.10(+/-0.15) and a column density in excess of the Galactic value of 1.0(+/-0.3)x10^23 cm^-2, with Chi^2/dof=24/21. The observed 2–10 keV flux is 6.0(+/-0.7)x10^-13 ergs cm^-2 s^-1. These results suggest that the source could be an X-ray absorbed Seyfert 2.