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Chandra Observations of MRK 273: Unveiling the Central AGN and the Extended Hot Gas Halo | | X.Y. Xia
; S.J. Xue
; S. Mao
; Th. Boller
; Z.G. Deng
; H. Wu
; | | Date: |
30 Jul 2001 | | Subject: | astro-ph | | Affiliation: | 1,2), S.J. Xue , S. Mao , Th. Boller , Z.G. Deng (5,2), and H. Wu ( Tjnu, China; Naos, Cas; Jodrell Bank; Mpe; GS, Cas | | Abstract: | We report X-ray observations of the field containing the ultraluminous IRAS galaxy Mrk~273 Using the ACIS-S3 instrument on board Chandra. The high resolution X-ray image, for the first time, reveals a compact hard X-ray nucleus in Mrk~273. Its X-ray energy distribution is well described by a heavily obscured power-law spectrum plus a narrow $Feka$ emission line at 6.4 keV. The neutral hydrogen column density is about $4 imes10^{23}cm^{-2}$, implying an absorption -corrected X-ray luminosity (0.1--10 keV) for the nucleus of $Lxapprox 6.5 imes 10^{43} ergs$. There are also bright soft X-ray clumps and diffuse soft X-ray emissions surrounding the central hard X-ray nucleus within the $10arcsec$ of the nuclear region. Its spectrum can be fitted by a MEKAL thermal model with temperature of about 0.8 keV and high metallicity ($Zsim 1.5Z_odot$) plus emission lines from $alpha$ elements and ions. Further outside the central region, the Chandra observations reveal a very extended hot gas halo with a projected diameter of about $108 kpc imes 68 kpc$ and soft X-ray luminosity of $Lxapprox 1.9 imes 10^{41} ergs$. The temperature of the hot gas is about 0.62 keV with a low metallicity ($Z sim 0.1 Z_odot$). We discuss the nature of the AGN in Mrk~273 and the implications of our results on the origin of X-ray halos in elliptical galaxies. We also discuss the properties of Mrk~273x, a background AGN in the Mrk~273 field. The AGN has an X-ray luminosity of $Lx approx 2.43 imes 10^{44}ergs$ in the 0.5-10 keV band. Its X-ray properties resemble those of Seyfert 1 galaxies while its optical properties are similar to Seyfert 2 galaxies. Such mixed classifications may be a challenge for the unification scheme of AGNs. | | Source: | arXiv, astro-ph/0107559 | | Services: | Forum | Review | PDF | Favorites | |
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