Papers › Measuring the X-ray luminosities of DESI groups from eROSITA Final Equatorial-Depth...
Measuring the X-ray luminosities of DESI groups from eROSITA Final Equatorial-Depth Survey: I. X-ray luminosity -- halo mass scaling relation
Yunliang Zheng, Xiaohu Yang, Min He, Shi-Yin Shen, Qingyang Li, Xuejie Li
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We use the eROSITA Final Equatorial-Depth Survey (eFEDS) to measure the rest-frame 0.1-2.4 keV band X-ray luminosities of ∼ 600,000 DESI groups using two different algorithms in the overlap region of the two observations. These groups span a large redshift range of 0.0 ≤z_g ≤1.0 and group mass range of 10^(10.76)h⁻¹M_⊙ ≤Mₕ ≤10^(15.0)h⁻¹M_⊙. (1) Using the blind detection pipeline of eFEDS, we find that 10932 X-ray emission peaks can be cross matched with our groups, ∼38 % of which have signal-to-noise ratio S/N ≥3 in X-ray detection. Comparing to the numbers reported in previous studies, this matched sample size is a factor of ∼6 larger. (2) By stacking X-ray maps around groups with similar masses and redshifts, we measure the average X-ray luminosity of groups as a function of halo mass in five redshift bins. We find, in a wide halo mass range, the X-ray luminosity, L_X, is roughly linearly proportional to Mₕ, and is quite independent to the redshift of the groups. (3) We use a Poisson distribution to model the X-ray luminosities obtained using two different algorithms and obtain best-fit L_X=10^(28.46±0.03)Mₕ^(1.024±0.002) and L_X=10^(26.73 ±0.04)Mₕ^(1.140 ±0.003) scaling relations, respectively. The best-fit slopes are flatter than the results previously obtained, but closer to a self-similar prediction.
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