Chandra Detection of Local Warm-Hot Gas Toward Markarian 279

Abstract

We report the Chandra detection of OVII Kαabsorption at z=0 in the direction of the z=0.03 Seyfert 1 galaxy Mkn 279. The high velocity cloud Complex C lies along this line of sight, with HI 21-cm emission and OVI 1032Åabsorption both observed at velocities of ~ -150 km/s relative to the local standard of rest. We present an improved method for placing limits on the Doppler parameter and column density of a medium when only one unresolved line can be measured; this method is applied to the OVII absorption seen here, indicating that the OVII Doppler parameter is inconsistent with that of any low-velocity (Galactic thick disk) or high-velocity OVI (OVI_HV) component. Direct association of the OVII with the OVI_HV is further ruled out by the high temperatures required to produce the observed OVI_HV/OVII ratio and the significant velocity difference between the OVII and OVI_HV lines. If the OVII absorption is associated with a very broad, undetected OVI component, then the absorption must be broadened by primarily nonthermal processes. The large velocity dispersion and possible slight redshift of the OVII absorption (as well as limits on the absorber's temperature and density) may be indicative of a local intergalactic medium origin, though absorption from a hot, low-density Galactic corona cannot be ruled out.

arXiv comment20 pages including 5 figures, 1 table; minor changes to text/figures, accepted to ApJ

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Cited by in corpus (27)

• Galaxy Formation Theory
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• Do extragalactic cosmic rays induce cycles in fossil diversity?
• XMM-Newton Survey of Local O VII Absorption Lines in the Spectra of Active Galactic Nuclei
• Characterizing the Low-Redshift Intergalactic Medium towards PKS1302-102
• Confirming the Detection of an Intergalactic X-ray Absorber Toward PKS 2155-304
• The Properties of the Galactic Hot Gaseous Halo from X-ray Emission
• Chandra and Far Ultraviolet Spectroscopic Explorer Observations of z~0 Warm-Hot Gas Toward PKS 2155-304
• Super-virial temperature or Neon overabundance?: Suzaku observations of the Milky Way circumgalactic Medium
• Probing the anisotropy of the Milky Way gaseous halo: Sight-lines toward Mrk 421 and PKS2155-304
• The weak absorbing outflow in AGN Mrk 279: evidence of super-solar metal abundances
• Thermal and chemical properties of the eROSITA bubbles from Suzaku observations
• The Surprisingly Constant Strength of O VI Absorbers over Cosmic Time
• XMM-Newton RGS observation of the warm absorber in Mrk 279
• Baryons: What, When and Where?
• XMM-Newton unveils the complex iron K alpha region of Mrk 279
• X-Ray Absorption by the Warm-Hot Intergalactic Medium in the Hercules Supercluster
• On the Origin of Highly Ionized X-ray Absorbers Detected in the Galactic X-ray Binaries
• Effect of the Metallicity on the X-ray Emission from the Warm-Hot Intergalactic Medium
• Probing the Warm-Hot Circumgalactic Medium with broad OVI and X-rays
• A Spitzer-MIPS search for dust in compact high-velocity HI clouds
• On the nature of the z=0 X-ray absorbers: I. Clues from an external group
• The ionic composition of the local absorber towards 3C 273
• Searching for the Missing Baryons in the Warm-Hot Intergalactic Medium
• Lost Baryons at Low Redshift