论文标题
矮星系中中红外变异性的发病率低
A Low Incidence of Mid-Infrared Variability in Dwarf Galaxies
论文作者
论文摘要
使用从共同/新的多上述目录的8。4年的光度法，我们比较了2197个矮星系样本（M_Stellar <2 x 10^9 H^-2 m_sun）样本的中红外变异性能与6591个样本与6591个样本（M_Stellar> 10^10^10^10 h-2 MIND）。我们发现只有2个矮星系具有中红外变异性，比较大的星系少约10倍（P = 6 x 10^-6），与先前使用具有相似基线和cadence的数据的低质量和矮人星系中光学变异性的发现相一致。在更大的控制星系人群中，我们没有看到中红外变异性恒星质量依赖性的证据，这表明可变物体频率的这种明显降低发生在恒星质量下方〜10^10 H^-2 m_sun下方。与更大的星系相比，使用其中红外颜色或光学发射线分类中选择的AGN在矮星系中选择的AGN被可变性选择系统地遗漏了。我们的结果表明，与以前相似的节奏的光学研究一致，除非使用高疗程数据，否则矮星系中AGN的变异性选择是无效的。
Using 8.4 years of photometry from the AllWISE/NEOWISE multi-epoch catalogs, we compare the mid-infrared variability properties of a sample of 2197 dwarf galaxies (M_stellar < 2 x 10^9 h^-2 M_sun) to a sample of 6591 more massive galaxies (M_stellar >= 10^10 h^-2 M_sun) matched in mid-infrared apparent magnitude. We find only 2 dwarf galaxies with mid-infrared variability, a factor of ~10 less frequent than the more massive galaxies (p = 6 x 10^-6), consistent with previous findings of optical variability in low-mass and dwarf galaxies using data with a similar baseline and cadence. Within the more massive control galaxy population, we see no evidence for a stellar mass dependence of mid-infrared variability, suggesting that this apparent reduction in the frequency of variable objects occurs below a stellar mass of ~10^10 h^-2 M_sun. Compared to the more massive galaxies, AGNs selected in dwarf galaxies using either their mid-infrared color or optical emission line classification are systematically missed by variability selection. Our results suggest, in agreement with previous optical studies at similar cadence, that variability selection of AGNs in dwarf galaxies is ineffective unless higher-cadence data is used.
