论文标题
从ZTF和SRG/EFEDS X射线目录中发现了两个Porars
Discovery of Two Polars from a Crossmatch of ZTF and the SRG/eFEDS X-ray Catalog
论文作者
论文摘要
磁性简历是发光的银河系X射线源，但由于缺乏爆发行为，在纯粹的光学调查中很难找到。 SPEKTR-RG（SRG）任务上的Erosita望远镜正在进行全天空的X射线调查，并最近发布了公共Erosita最终赤道深度调查（EFEDS）目录。我们从Zwicky瞬态设施（ZTF）的光度法交叉匹配EFEDS目录，并发现了两个新的磁性灾难变量（CVS）。我们为每个磁性CV候选者获得了高振动光学光度法和相分辨光谱的，并发现它们都是肺孔。在新发现的磁性CVS中是ZTFJ0850+0443，是轨道周期$ p_ \ textrm {orb {orb} = 1.72 $ hr，白色dwarf mass $ m_ \ textrm {wd} = 0.81 10^{ - 11} m_ \ odot $/yr。我们建议ZTFJ0850+0443是低磁场强度极性，其$ b_ \ textrm {wd} \ Lessim 10 $ mg。我们还发现了一个非分配的极性，ZTFJ0926+0105，带有轨道周期$ p_ \ textrm {orb {orb} = 1.48 $ hr，磁场强度$ b_ \ textrm {wd} \ gtrs {
Magnetic CVs are luminous Galactic X-ray sources but have been difficult to find in purely optical surveys due to their lack of outburst behavior. The eROSITA telescope aboard the Spektr-RG (SRG) mission is conducting an all-sky X-ray survey and recently released the public eROSITA Final Equatorial Depth Survey (eFEDS) catalog. We crossmatched the eFEDS catalog with photometry from the Zwicky Transient Facility (ZTF) and discovered two new magnetic cataclysmic variables (CVs). We obtained high-cadence optical photometry and phase-resolved spectroscopy for each magnetic CV candidate and found them both to be polars. Among the newly discovered magnetic CVs is ZTFJ0850+0443, an eclipsing polar with orbital period $P_\textrm{orb} = 1.72$ hr, white dwarf mass $M_\textrm{WD} = 0.81 \pm 0.08 M_\odot$ and accretion rate $\dot{M} \sim 10^{-11} M_\odot$/yr. We suggest that ZTFJ0850+0443 is a low magnetic field strength polar, with $B_\textrm{WD} \lesssim 10$ MG. We also discovered a non-eclipsing polar, ZTFJ0926+0105, with orbital period $P_\textrm{orb} = 1.48$ hr, magnetic field strength $B_\textrm{WD} \gtrsim 26$ MG, and accretion rate $\dot{M} \sim 10^{-12} M_\odot$/yr.
