Infrared Counterparts to Chandra X-Ray Sources in the Antennae

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dc.creatorClark, D. M.
dc.creatorEikenberry, S. S.
dc.creatorBrandl, B. R.
dc.creatorWilson, J. C.
dc.creatorCarson, J. C.
dc.creatorHenderson, C. P.
dc.creatorHayward, T. L.
dc.creatorBarry, D. J.
dc.creatorPtak, A. F.
dc.creatorColbert, E. J. M.
dc.date2006-12-06
dc.date.accessioned2026-07-07T12:31:15Z
dc.date.available2026-07-07T12:31:15Z
dc.descriptionWe use deep J and Ks images of the Antennae (NGC 4038/9) obtained with WIRC on the Palomar 200-inch telescope, together with the Chandra X-ray source list of Zezas et al. (2002a), to search for IR counterparts to X-ray point sources. We establish an X-ray/IR astrometric frame tie with 0.5" rms residuals over a \~4.3' field. We find 13 ``strong'' IR counterparts brighter than Ks = 17.8 mag and < 1.0" from X-ray sources, and an additional 6 ``possible'' IR counterparts between 1.0" and 1.5" from X-ray sources. The surface density of IR sources near the X-ray sources suggests only ~2 of the ``strong'' counterparts and ~3 of the ``possible'' counterparts are chance superpositions of unrelated objects. Comparing both strong and possible IR counterparts to our photometric study of ~220 Antennae, IR clusters, we find the IR counterparts to X-ray sources are \~1.2 mag more luminous in Ks than average non-X-ray clusters. We also note that the X-ray/IR matches are concentrated in the spiral arms and ``overlap'' regions of the Antennae. This implies that these X-ray sources lie in the most ``super'' of the Antennae's Super Star Clusters, and thus trace the recent massive star formation history here. Based on the N_H inferred from the X-ray sources without IR counterparts, we determine that the absence of most of the ``missing'' IR counterparts is because they are intrinsically less luminous in the IR, implying that they trace a different (possibly older) stellar population.
dc.description27 pages, 10 Poscript figures, accepted by ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0612169
dc.identifierhttp://arxiv.org/abs/astro-ph/0612169
dc.identifierAstrophys.J.658:319-327,2007
dc.identifierdoi:10.1086/511511
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/216382
dc.subjectAstrophysics
dc.titleInfrared Counterparts to Chandra X-Ray Sources in the Antennae
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