INTEGRAL detection of hard X-ray emission from the very faint X-ray transient IGR J17494-3030
ATel #14119; L. Ducci (IAAT, Germany; ISDC, Switzerland), J. Chenevez (DTU, Denmark), L. Sidoli, A. Paizis (INAF-IASF Milano, Italy), V. Grinberg (IAAT, Germany), E. Kuulkers (ESA/ESTEC, Netherlands - on behalf of the Galactic bulge monitoring program team), C. Sanchez-Fernandez (ESA/ESAC, Spain), J. Wilms (ECAP/FAU, Germany), C. Ferrigno, E. Bozzo, V. Savchenko (ISDC, Switzerland)
on 26 Oct 2020; 16:06 UT
Credential Certification: Lorenzo Ducci (lorenzo.ducci@unige.ch)
Subjects: X-ray, Black Hole, Neutron Star, Transient
We report the detection by INTEGRAL of a renewed X-ray activity of the
very faint X-ray transient IGR J17494-3030. The previous and only known
outburst of this source was reported at the time of discovery,
in March 2012. The outburst lasted about 3 weeks
(ATel #3984, ATel #3985, ATel #4886, Armas Padilla et al. 2013 MNRAS 436, 89).
IGR J17494-3030 was covered during the INTEGRAL observations of the
Galactic Center region (PIs J. Wilms E. Kuulkers) carried out
from 23 October 2020 at 7:36 to 24 October 2020 at 17:45
(UTC; INTEGRAL revolution 2289; total exposure time 113 ks).
The source is found in the 28-40 keV IBIS/ISGRI mosaic images
(effective exposure time ~14.4 ks) at a flux of 9.4 ± 1.3 mCrab,
and in the energy range 40-80 keV with a flux of 9.6 ± 1.6 mCrab
(uncertainties are at 68% confidence level).
IGR J17494-3030 is detected also in JEM-X mosaics
(effective exposure time ~28.3 ks) with a flux of 6.3 ± 1.6 mCrab
in the energy range 3-10 keV, and with a flux of 8.9 ± 3.2 mCrab in 10-25 keV.
Assuming a distance of 8 kpc (Armas Padilla et al. 2013 MNRAS 436, 89),
the measured flux corresponds to a luminosity of about
2 × 1036 erg/s (3-80 keV),
consistent with the luminosity reached during the previous outburst.
Further observations of the source in soft and hard X-rays,
as well as in other energy domains, are encouraged.
