论文标题
矮星形星系的HI成像：质量，形态和气体缺陷
HI imaging of dwarf star-forming galaxies: Masses, morphologies and gas deficiencies
论文作者
论文摘要
提出了HI 21〜CM线发射的GMRT观测值，从附近的矮星形成星系。样品星系的恒星形成率和恒星质量的范围分别为0.03-1.7〜 $ M_ \ odot〜 {\ rm yr}^{ - 1} $和0.04-22.3〜 $ \ $ \ times 10^8〜m_ m_ \ odot $。此处介绍了HI通道图像，力矩图像，全局曲线和质量表面密度曲线。峰值HI质量表面密度的平均值估计为$ \ sim $ 2.5〜m $ _ {\ odot} $ 〜pc $^{ - 2} $，与大型螺旋星系相比，这要少得多。 $（m_ {stars} + m _ {\ rm h \，i} + m _ {\ rm he}）$ vs $ vs $ m_ {dyn} $，气体分数vs $ m_b $，$ m_b $，$ m _ {质量比vs $ m_ {stars} $，$ m _ {\ rm h \，i} $ vs $ vs $ d _ {\ rm h \，i} $用于样品星系。这些缩放关系可用于限制银河发展模型中的关键参数。这些星系居住在组环境中，星系密度高达8〜Galaxy〜mpc $^{ - 3} $。与野外环境中的星系相比，大多数星系中都注意到大多数星系中的HI质量缺陷（带有$ def _ {\ rm hi}> 0.3 $）。可以使用HI图像推断出这些星系中潮汐相互作用的明确特征。在几个星系的附近看到了没有已知光学对应物的孤立的HI云。发现HI发射信封在几个星系中具有从光学包膜中的偏移。与先前关于小组环境中星系演化的研究一致，潮汐相互作用似乎在触发近期恒星形成中起着重要作用。
The GMRT observations of the HI 21~cm-line emission from 13~nearby dwarf star-forming galaxies are presented. The ranges of star formation rates and stellar masses of the sample galaxies are 0.03 -- 1.7~$M_\odot~{\rm yr}^{-1}$ and 0.04 -- 22.3~$\times 10^8~M_\odot$, respectively. The HI channel images, moment images, global profiles and mass surface density profiles are presented here. The average value of the peak HI mass surface density is estimated to be $\sim$2.5~M$_{\odot}$~pc$^{-2}$, which is significantly less compared to that in massive spiral galaxies. The scaling relations of $(M_{stars} + M_{\rm H\,I} + M_{\rm He})$ vs $M_{dyn}$, gas fraction vs $M_B$, $M_{\rm H\,I}$ vs $M_{stars}$, \ion{H}{i}-to-stellar mass ratio vs $M_{stars}$, and $M_{\rm H\,I}$ vs $D_{\rm H\,I}$ for the sample galaxies are estimated. These scaling relations can be used to constraint the key parameters in the galaxy evolution models. These galaxies are residing in group environment with galaxy density up to 8~galaxy~Mpc$^{-3}$. A HI mass deficiency (with $DEF_{\rm HI} > 0.3$) is noticed in majority of galaxies for their optical diameters as compared to galaxies in field environments. Clear signatures of tidal interactions in these galaxies could be inferred using the HI images. Isolated HI clouds without known optical counterparts are seen in the vicinity of several galaxies. HI emission envelope is found to be having an offset from the optical envelope in several galaxies. Consistent with the previous studies on galaxy evolution in group environments, tidal interactions seem to play an important role in triggering recent star formation.
