论文标题

狮子座中的群体内重子I对vst早期型银河系调查

The intra-group baryons in the LEO I pair from the VST Early-type GAlaxy Survey

论文作者

Ragusa, Rossella, Mirabile, Marco, Spavone, Marilena, Cantiello, Michele, Iodice, Enrichetta, La Marca, Antonio, Paolillo, Maurizio, Schipani, Pietro

论文摘要

在本文中,我们介绍了狮子座的深层,宽场和多频段成像,来自vst早期型星系调查(VEGAS)的NGC〜3379-NGC〜3384。这项研究的主要目的是以弥漫光和球状簇(GC)的形式绘制这对组内重子。 Taking advantage from the large covered area, which extends for $\sim$ 3.9 square degrees around the pair, and the long integration time, we can map the light distribution out to $\sim$ 63 kpc and down to $\sim$ 30 mag/arcsec$^2$ in the $g$ band and $\sim$ 29 mag/arcsec$^2$ in the $r$ band, deeper than previous data available for this target.组内灯(IGL)的地图提出了两个非常微弱的($μ_g\ sim $ 28-29 mag/arcsec $^2 $),它们从最明亮的组成员NGC〜3379伸出,并向西北和南部伸出。我们估计,NGC〜3379附近的恒星光环的比例加上Igl为$ \ sim 17 \ pm 2 \%$ in $ g $和$ r $ $ $ bands,平均颜色$ g $ - $ r $ = $ 0.75 \ $ 0.75 \ pm pm 0.04 $ 〜mag。 GC的颜色分布出现多模式,在(u-r)= 1.8 mag和(u-r)= 2.1 mag上有两个显性峰。 GC人口从东北到西南,从西北到南部的西北部,在最后一个情况下,与IGL的流重叠,以及\ citet {hartke2020}和\ citet {hartke202222arxiv2201087710H}的PNE分布。由于这些结构在附近两个星系M96和NGC〜3338的方向上拉长,因此它们可能是过去与两对的重力相互作用的残余。

In this paper we present the deep, wide-field and multi-band imaging of the LEO I pair NGC~3379-NGC~3384, from the VST Early-type GAlaxy Survey (VEGAS). The main goal of this study is to map the intra-group baryons in the pair, in the form of diffuse light and globular clusters (GCs). Taking advantage from the large covered area, which extends for $\sim$ 3.9 square degrees around the pair, and the long integration time, we can map the light distribution out to $\sim$ 63 kpc and down to $\sim$ 30 mag/arcsec$^2$ in the $g$ band and $\sim$ 29 mag/arcsec$^2$ in the $r$ band, deeper than previous data available for this target. The map of the intra-group light (IGL) presents two very faint ($μ_g \sim$ 28-29 mag/arcsec$^2$) streams protruding from the brightest group member NGC~3379 and elongated toward North-West and South. We estimate that the fraction of the stellar halo around NGC~3379 plus the IGL is $\sim 17 \pm 2\%$ in both $g$ and $r$ bands, with an average color $g$-$r$= $0.75 \pm 0.04$~mag. The color distribution of the GCs appears multi-modal, with two dominant peaks at (u-r) = 1.8 mag and (u-r) = 2.1 mag, respectively. The GC population stretches from North-East to South-West and from North-West to South of the pair, in the last case overlapping with the streams of IGL, as well as the PNe distribution found by \citet{Hartke2020} and \citet{Hartke2022arXiv220108710H}. Since these structures are elongated in the direction of the two nearby galaxies M96 and NGC~3338, they could be the remnant of a past gravitational interactions with the pair.

扫码加入交流群

加入微信交流群

微信交流群二维码

扫码加入学术交流群,获取更多资源