论文标题
deproding Galaxy-Cluster Cold Fronts：散装，磁性螺旋流的证据
Deprojecting galaxy-cluster cold fronts: evidence for bulk, magnetised spiral flows
论文作者
论文摘要
分组（CFS）的切向不连续性在星系的组和簇中很丰富。最初认为轻松的螺旋型CFS是同等级的，但在热压$ p_t $中，$ 10 \％$ - $ 20 \％$跳高$ p_t $，当deprojected cfs堆叠时，被解释为在cfs下方缺少$ p_t $（即在较小的radii $ r $ r $ r $ r $ r）的情况下，因为不属于local $ r $）。 $ p_ {nt} $。我们报告了Centaurus群集中的单个尖锐CF的重要（$ \sim4.3σ$）在$ p_t $中跳跃。在GCS A2029，A2142，A2204和Centaurus中，其他七个CF被发现，所有CF都发现一致（堆叠：$ \sim1.9σ$），并具有类似的压力跳跃。将我们的样本与文献中的高质量DEDODECTED CF相结合，表明压力的显着性水平在$2.7σ$和5.0σ$之间，具体取决于假设。我们的名义结果与$ p_ {nt} \ simeq（0.1 \ mbox { - } 0.3）p_t $在CF下方。我们测试了不同的重题和分析方法，以确认我们的结果是稳健的，并表明如果不仔细的删除，可能会错误地推断出相反的压力趋势。分析所有可用的数据数据，我们还发现：（i）每个GC内的密度和温度的近乎恒定的CF对比度$ Q $ Q $ Q $ q $ Q $ Q $，随着GC质量$ M_ {200} $的单调增加，为$ q \ propto m_ {200}^{0.23 \ pm0.04} $; （ii）静水质量不连续性，表明在所有deprodented CFS以下快速散装切向流动，平均马赫数$ \ sim0.76 $; （iii）新销售的CFS是一致的（堆叠：$ \sim2.9σ$），$ 1.25^{+0.09} _ { - 0.08} $ METALLICITY plosec.这些发现表明，GC通常具有扩展的螺旋流动。
Tangential discontinuities known as cold fronts (CFs) are abundant in groups and clusters of galaxies (GCs). The relaxed, spiral-type CFs were initially thought to be isobaric, but a significant, $10\%$--$20\%$ jump in the thermal pressure $P_t$ was reported when deprojected CFs were stacked, interpreted as missing $P_t$ below the CFs (i.e. at smaller radii $r$) due to a locally-enhanced nonthermal pressure $P_{nt}$. We report a significant ($\sim4.3σ$) deprojected jump in $P_t$ across a single sharp CF in the Centaurus cluster. Additional seven CFs are deprojected in the GCs A2029, A2142, A2204, and Centaurus, all found to be consistent (stacked: $\sim1.9σ$) with similar pressure jumps. Combining our sample with high quality deprojected CFs from the literature indicates pressure jumps at significance levels ranging between $2.7σ$ and $5.0σ$, depending on assumptions. Our nominal results are consistent with $P_{nt}\simeq (0.1\mbox{--}0.3)P_t$ just below the CF. We test different deprojection and analysis methods to confirm that our results are robust, and show that without careful deprojection, an opposite pressure trend may incorrectly be inferred. Analysing all available deprojected data, we also find: (i) a nearly constant CF contrast $q$ of density and temperature within each GC, monotonically increasing with the GC mass $M_{200}$ as $q\propto M_{200}^{0.23\pm0.04}$; (ii) hydrostatic mass discontinuities indicating fast bulk tangential flows below all deprojected CFs, with a mean Mach number $\sim0.76$; and (iii) the newly deprojected CFs are consistent (stacked: $\sim2.9σ$) with a $1.25^{+0.09}_{-0.08}$ metallicity drop across the CF. These findings suggest that GCs quite generally harbor extended spiral flows.
