论文标题

发现M81附近的红色后挡板星系候选人

Discovery of a red backsplash galaxy candidate near M81

论文作者

Casey, Kirsten J., Greco, Johnny P., Peter, Annika H. G., Davis, A. Bianca

论文摘要

了解低质量星系中的淬火机制对于理解整体星系演化至关重要。尤其是,孤立的星系是帮助解开影响恒星形成的复杂内部和外部过程的重要工具。低质量制度中淬火场与卫星星系之间的比较为发现提供了大量机会,尽管很少有低于$ m _ {\ m _ {\ star} $$ \ SIM $ \ sim $ \ sim $ \ sim $ 10^{9} m _ {\ odot} $的淬火星系在$ m _ {\ star} $ _ {\ sim $ \ sim $ \ sim $ \ sim $ _ {\ odot} $之外,是在病毒radius之外,$ r _ {vir} $ halo。重要的是,模拟和观察结果表明,也存在后挡板星系之间的内在人群,可以补充对环境淬火的解释。后挡板星系(如田间星系)居住在宿主光环的病毒半径之外,但是它们的恒星形成可能会受到先前与更大的系统相互作用的影响。在本文中,我们报告了一个低质量的发现($ m _ {\ star} $$ \ sim $$ 10^{7} m _ {\ odot} $)淬灭星系,大约$ 1 r_ {vir} $ in Introvection the M81组。我们使用表面亮度波动(SBF)来研究新的星系被称为DW0910P7326(昵称为blobby),是后挡板星系或更遥远的田间星系。 $ 3.21 \替换的SBF距离{+0.15 +0.41 \\ -0.15 -0.36} $ MPC表明Blobby可能在$ 1.0 <r_ {vir} <2.7 $之间,<r_ {vir} <2.7 $,在组合M81- -M82系统之外。鉴于其距离和静止,Blobby是后挡板星系的良好候选者,可以提供有关这些有趣对象的形成和演变的提示。

Understanding quenching mechanisms in low-mass galaxies is essential for understanding galaxy evolution overall. In particular, isolated galaxies are important tools to help disentangle the complex internal and external processes that impact star formation. Comparisons between quenched field and satellite galaxies in the low mass regime offer a substantial opportunity for discovery, although very few quenched galaxies with masses below $M_{\star}$$\sim$$10^{9} M_{\odot}$ are known outside the virial radius, $R_{vir}$, of any host halo. Importantly, simulations and observations suggest that an in-between population of backsplash galaxies also exists that may complement interpretations of environmental quenching. Backsplash galaxies -- like field galaxies -- reside outside the virial radius of a host halo, but their star formation can be deeply impacted by previous interactions with more massive systems. In this paper, we report the discovery of a low-mass ($M_{\star}$$\sim$$10^{7} M_{\odot}$) quenched galaxy approximately $1 R_{vir}$ in projection from the M81 group. We use surface brightness fluctuations (SBF) to investigate the possibility that the new galaxy, dubbed dw0910p7326 (nicknamed Blobby), is a backsplash galaxy or a more distant field galaxy. The measured SBF distance of $3.21\substack{+0.15 +0.41 \\ -0.15 -0.36}$ Mpc indicates that Blobby likely lies between $1.0 < R/R_{vir} < 2.7$ outside the combined M81--M82 system. Given its distance and quiescence, Blobby is a good candidate for a backsplash galaxy and could provide hints about the formation and evolution of these interesting objects.

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