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Discovery of a large-scale galaxy filament near a candidate intergalactic X-ray absorption system | | Rik J. Williams
; John S. Mulchaey
; Juna A. Kollmeier
; Thomas J. Cox
; | | Date: |
30 Aug 2010 | | Abstract: | We present an analysis of the large-scale galaxy distribution around two
possible warm-hot intergalactic medium (WHIM) absorption systems reported along
the Markarian 421 sightline. Using the Sloan Digital Sky Survey, we find a
prominent galaxy filament at the redshift of the z=0.027 X-ray absorption line
system. The filament exhibits a width of approximately 4 Mpc and length of at
least 20 Mpc, comparable to the size of WHIM filaments seen in cosmological
simulations. No individual galaxies fall within 350 projected kpc so it is
unlikely that the absorption is associated with gas in a galaxy halo or
outflow. Another, lower-significance X-ray absorption system was reported in
the same Chandra spectrum at z=0.011, but the large-scale structure in its
vicinity is far weaker and may be a spurious alignment. By searching for
similar galaxy structures in 140 random smoothed SDSS fields, we estimate a
~5-10% probability of the z=0.027 absorber-filament alignment occurring by
chance. If these two systems are indeed physically associated, this would
represent the first known coincidence between large-scale galaxy structure and
a blind X-ray WHIM detection. | | Source: | arXiv, 1008.5148 | | Services: | Forum | Review | PDF | Favorites | |
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