Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-16
Astrophys.J.598:L83-L86,2003
Astronomy and Astrophysics
Astrophysics
4 pages, uses emulateapj.cls, ApJL (accepted)
Scientific paper
10.1086/380775
We observed the Seyfert I active galaxy/broad line radio galaxy 3C120 with the Chandra high energy transmission gratings and present an analysis of the soft X-ray spectrum. We identify the strongest absorption feature (detected at >99.9% confidence) with O VIII Lya (FWHM=1010^{+295}_{-265} km/s), blueshifted by -5500 +/- 140 km/s from systemic velocity. The absorption may be due to missing baryons in warm/hot intergalactic medium (WHIGM) along the line-of-sight to 3C 120 at z=0.0147 +/- 0.0005, or it could be intrinsic to the jet of 3C 120. Assuming metallicities of 0.1 solar, we estimate an ionic column density of N_{O VIII}>3.4 \times 10^{16} cm^{-2} for WHIGM and a filament depth of <19 h^{-1}_{70} Mpc. We find a baryon overdensity >56 relative to the critical density of a $\Lambda$-dominated cold dark matter universe, which is in reasonable agreement with WHIGM simulations. We detect, at marginal significance, absorption of O VIII Lya at z\sim 0 due to a hot medium in the Local Group. We also detect an unidentified absorption feature at \sim 0.71 keV. Absorption features which might be expected along with O VIII Lya, were not significant statistically. Relative abundances of metals in the WHIGM and local absorbers may therefore be considerably different from solar.
George Ian Michael
McKernan Barry
Mushotzky Richard
Turner Tracey Jane
Yaqoob Tahir
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