XMM-Newton View of the z>0 Warm-Hot Intergalactic Medium Toward Markarian 421

Abstract

The recent detection with Chandra of two warm-hot intergalactic medium (WHIM) filaments toward Mrk 421 by Nicastro et al. provides a measurement of the bulk of the "missing baryons" in the nearby universe. Since Mrk 421 is a bright X-ray source, it is also frequently observed by the XMM-Newton Reflection Grating Spectrometer (RGS) for calibration purposes. Using all available archived XMM observations of this source with small pointing offsets (<15"), we construct the highest-quality XMM grating spectrum of Mrk 421 to date with a net exposure time (excluding periods of high background flux) of 437 ks and \~15000 counts per resolution element at 21.6A, more than twice that of the Chandra spectrum. Despite the long exposure time neither of the two intervening absorption systems is seen, though the upper limits derived are consistent with the Chandra equivalent width measurements. This appears to result from (1) the larger number of narrow instrumental features caused by bad detector columns, (2) the degraded resolution of XMM/RGS as compared to the Chandra/LETG, and (3) fixed pattern noise at λ> 29A. The non-detection of the WHIM absorbers by XMM is thus fully consistent with the Chandra measurement.

arXiv comment12 pages, 3 figures; minor changes to text and one figure added, accepted to ApJL

References in corpus (16)

• Where are the Baryons?
• Baryons in the Warm-Hot Intergalactic Medium
• A Lower Bound on the Cosmic Baryon Density
• Chandra Detection of the First X-ray Forest along the Line of Sight To Mkn 421
• Chandra Detection of OVIII Ly-alpha Absorption from an Overdense Region in the Intergalactic Medium
• Tracing the Warm-Hot Intergalactic Medium at Low Redshift: X-ray Forest Observations Towards H1821+643
• Physical Properties and Baryonic Content of Low-Redshift Intergalactic Ly-alpha and O VI Absorption Systems: The PG1116+215 Sight Line
• The X-Ray Forest: A New Prediction of Hierarchical Structure Formation Models
• FUSE and STIS Observations of the Warm-Hot Intergalactic Medium towards PG1259+593
• X-Ray Absorption by the Hot Intergalactic Medium
• Probing the Local Group Medium Toward Mkn 421 with Chandra and FUSE
• The Hot Intergalactic Medium - Galaxy Connection: Two Strong Absorbers in the Sightline Toward PG 1211+143
• Simulating the X-ray Forest
• A warm hot intergalactic medium towards 3C 120?
• High Resolution Spectroscopy of X-ray Quasars: Searching for the X-ray Absorption from the Warm-Hot Intergalactic Medium
• A search for Warm-Hot Intergalactic Medium features in the X-ray spectra of Mkn 421 with the XMM-Newton RGS

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• The O VII X-ray forest toward Markarian 421: Consistency between XMM-Newton and Chandra
• On the Putative Detection of z>0 X-ray Absorption Features in the Spectrum of Markarian 421
• Missing Baryons and the Warm-Hot Intergalactic Medium
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• A Two-Phase Low-velocity Outflow in the Seyfert 1 Galaxy Ark~564
• Discovery of a large-scale galaxy filament near a candidate intergalactic X-ray absorption system
• Detection capabilities of the Athena X-IFU for the warm-hot intergalactic medium using gamma-ray burst X-ray afterglows
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