$\mathrm{L{\small{ITTLE}}}$ $\mathrm{T{\small{HINGS}}}$矮星系的$\textit{Herschel}$测光观测
$\textit{Herschel}$ Photometric Observations of $\mathrm{L{\small{ITTLE}}}$ $\mathrm{T{\small{HINGS}}}$ Dwarf Galaxies
摘要：
我们在这里提出的远红外测光的星系在这些波长的样本是相对未开发的：低金属量矮星系与中等恒星形成率。本文讨论了四个来自$\mathrm{L{\small{ITTLE}}}$ $\mathrm{T{\small{HINGS}}}$巡天的矮不规则星系，它们的深$\textit{Herschel}$ PACS和SPIRE观测值分别为100 $μ$ m，160 $μ$ m，250 $μ$ m，350 $μ$ m和500 $μ$ m。修正黑体拟合的结果表明，这些星系的尘埃质量较低，尘埃温度较低，比更活跃的恒星形成的矮星，占据最低的$L_\mathrm{TIR}$和$M_\mathrm{dust}$制度中看到这些样本。总体而言，$\sim$ 10 $^{-5}$的尘埃与气体质量比低于更大质量和更活跃的星系，但与其他低金属量系统中发现的尘埃与气体比和金属量之间的破幂律关系大致一致。化学演化模型表明，这些矮星系可能通过恒星或颗粒生长形成很少的尘埃，并且具有非常高的尘埃破坏率。
英文摘要：
We present here far-infrared photometry of galaxies in a sample that is relatively unexplored at these wavelengths: low-metallicity dwarf galaxies with moderate star formation rates. Four dwarf irregular galaxies from the $\mathrm{L{\small{ITTLE}}}$ $\mathrm{T{\small{HINGS}}}$ survey are considered, with deep $\textit{Herschel}$ PACS and SPIRE observations at 100 $μ$m, 160 $μ$m, 250 $μ$m, 350 $μ$m, and 500 $μ$m. Results from modified-blackbody fits indicate that these galaxies have low dust masses and cooler dust temperatures than more actively star-forming dwarfs, occupying the lowest $L_\mathrm{TIR}$ and $M_\mathrm{dust}$ regimes seen among these samples. Dust-to-gas mass ratios of $\sim$10$^{-5}$ are lower, overall, than in more massive and active galaxies, but are roughly consistent with the broken power law relation between the dust-to-gas ratio and metallicity found for other low-metallicity systems. Chemical evolution modeling suggests that these dwarf galaxies are likely forming very little dust via stars or grain growth, and have very high dust destruction rates.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
