arXiv 2008.045282020-08-11astro-ph.GA

矮恒星形成星系的HI成像：质量、形态和气体缺乏

HI imaging of dwarf star-forming galaxies: Masses, morphologies and gas deficiencies

Sumit Jaiswal, Amitesh Omar

备注：: 70 pages, 36 figures, accepted for publication in MNRAS
DOI：: 10.1093/mnras/staa2420

摘要：

本文报道了13个邻近矮恒星形成星系的HI 21 cm线辐射的GMRT观测结果。样本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~ $\times 10^8~M_\odot$。给出了HI通道图像、矩图像、整体轮廓和质量表面密度轮廓。峰值HI质量面密度的平均值估计为$\sim$ 2.5~M $_{\odot}$ ~pc $^{-2}$，与大质量旋涡星系相比明显减小。估算了样本星系的$(M_{stars} + M_{\rm H\,I} + M_{\rm He})$与$M_{dyn}$、气体分数与$M_B$、$M_{\rm H\,I}$与$M_{stars}$、\ion{H}{i}与恒星质量比与$M_{stars}$、$M_{\rm H\,I}$与$D_{\rm H\,I}$的标度关系。这些标度关系可以用来约束星系演化模型中的关键参数。这些星系处于星系群环境中，星系密度高达8~galaxy~Mpc $^{-3}$ .一个HI质量不足（与$DEF_{\rm HI} > 0.3$）注意到在大多数星系的光学直径相比，在现场环境中的星系。在这些星系的潮汐相互作用的清晰签名可以推断使用HI图像。在几个星系附近可以看到孤立的HI云，没有已知的光学对应物。HI发射包络被发现有一个偏移的光学包络在几个星系。与以前对星系群环境演化的研究一致，潮汐相互作用似乎在触发最近的恒星形成中起着重要作用。

英文摘要：

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.

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