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Chandra and Optical Identification of INTEGRAL Sources

ATel #572; J. P. Halpern (Columbia U.)
on 1 Aug 2005; 18:34 UT
Credential Certification: Jules Halpern (jules@astro.columbia.edu)

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

Referred to by ATel #: 719, 783, 2594, 2597

Using public Chandra Director's Discretionary Time observations obtained in 2005 June-July of unidentified, high-latitude INTEGRAL sources that were suspected to be obscured AGN (PI: R. Sunyaev), I report their basic properties from the ACIS-I images, and optical counterparts from the Digitized Sky Survey. In each case, the brightest source in the Chandra image is chosen as the likely identification. As was predicted, most (but not all) of these are low-redshift galaxies with hard X-ray counterparts. However, several are also well detected at energies < 2 keV.

An R-band image of the galaxy counterpart to IGR J19473+4452 was obtained on the MDM 2.4m telescope in 1.1" seeing on 2005 July 2. It shows a disk galaxy with a bright, slightly resolved bulge.

Optical spectra are needed to determine the nature of the activity of all these counterparts. Optical finding charts are linked below.

IGR Obs ID Exp Time Chandra Position (J2000) Counts Counts
(s) R.A. (h m s), Decl. (° ' ") (0.2-2 keV)(2-10 keV)
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J05007-7047 6271341505 00 46.09, -70 44 36.1159482
J07563-4137 6272321607 56 19.62, -41 37 42.2186525
J10252-6829 62733633. . .<26<12
J11085-5100 62743630. . .<17<10
J12026-5349 6275322012 02 47.62, -53 50 07.6118650
J12391-1612* 6276321312 39 06.29, -16 10 47.153280
J13091+1137 6277362713 09 05.60, +11 38 03.03103
J19473+4452 6278359219 47 19.36, +44 49 42.313264
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* Probably XSS J1238.9-1614 (RXTE slew survey, Revnivtsev, M., et al. 2004, A&A, 418, 927 )

CXOU Optical and Other Identification
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J050046.0-704436 USNO B1.0 star: B=14.92, R=15.30, I=15.26
J075619.6-413742 IRAS 07545-4129, pair or disturbed galaxy?
J120247.6-535007 IRAS 12002-5333 (z=0.0279)
J123906.2-161047 LEDA 170194 (z=0.0367) = NVSS J123906.3-161046**
J130905.6+113803 NGC 4992 (z=0.0251)
J194719.3+444942 2MASX J19471938+4449425
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** 39.4 mJy @ 21 cm (source correction to Bassani et al. ATEL #537)

Optical Finding Charts