The creation of a massive UCD by tidal threshing from NGC 936

Q1 Earth and Planetary Sciences

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-08-09 DOI:10.1093/mnrasl/slad126

Sanjaya Paudel, Pierre-Alain Duc, Sungsoon Lim, Mélina Poulain, Francine R Marleau, Oliver Müller, Rubén Sánchez-Janssen, Rebecca Habas, Patrick R Durrell, Nick Heesters, Daya Nidhi Chhatkuli, Suk-Jin Yoon

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Abstract

We study a compact nucleus embedded in an early-type dwarf galaxy, MATLAS-167, which is in the process of disruption by the tidal force of the neighboring giant S0 galaxy, NGC 936, in a group environment. Using the imaging data of the MATLAS survey, we analyze the stellar tidal tail of MATLAS-167 and its central compact nucleus, designated as NGC 936_UCD. We find that NGC 936_UCD has a luminosity of M$_{g}$ = $-$11.43$\pm$0.01 mag and a size of 66.5$\pm$17 pc, sharing the global properties of Ultra Compact Dwarf galaxies (UCDs) but significantly larger and brighter compared to the typical UCD populations observed in the Virgo cluster. By integrating the total luminosity of both the tidal stream and MATLAS-167, we estimate that the disrupted dwarf progenitor possesses a luminosity of M$_{g}$ = $-$15.92$\pm$0.06 mag, a typical bright dE luminosity. With the help of the optical spectrum observed by the SDSS survey, we derive the simple stellar population properties of NGC 936_UCD: a light-weighted age of 5.6$\pm$0.7 Gyr and metallicity of [Z/H] = $-$0.83$\pm$0.3 dex. Our findings suggest that tidal threshing is a possible formation mechanism of bright UCD populations in close proximity to giant galaxies.

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ngc936的潮汐脱粒形成了一个巨大的UCD

我们研究了一个嵌在早期矮星系matas -167中的致密核，该星系在群体环境中受到邻近的巨大星系NGC 936的潮汐力的破坏。利用MATLAS巡天的成像数据，我们分析了MATLAS-167的恒星潮尾及其中心致密核NGC 936_UCD。我们发现NGC 936_UCD的光度为M$_{g}$ = $-$11.43$\pm$0.01等，大小为66.5$\pm$17 pc，具有超紧凑矮星系(UCD)的整体特性，但与室女座星系团中观察到的典型UCD群体相比，它们明显更大、更亮。通过积分潮汐流和matas -167的总光度，我们估计被破坏的矮祖先的光度为M$_{g}$ = $-$15.92$\pm$0.06等，是典型的明亮dE光度。利用SDSS巡天观测到的光谱，我们推导出NGC 936_UCD的简单恒星群性质:轻质量年龄为5.6$\pm$0.7 Gyr，金属量为[Z/H] = $-$0.83$\pm$0.3指数。我们的发现表明潮汐脱粒可能是靠近巨大星系的明亮UCD群的形成机制。

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来源期刊

Monthly Notices of the Royal Astronomical Society: Letters Earth and Planetary Sciences-Space and Planetary Science

CiteScore

8.80

自引率

0.00%

发文量

136

期刊介绍： For papers that merit urgent publication, MNRAS Letters, the online section of Monthly Notices of the Royal Astronomical Society, publishes short, topical and significant research in all fields of astronomy. Letters should be self-contained and describe the results of an original study whose rapid publication might be expected to have a significant influence on the subsequent development of research in the associated subject area. The 5-page limit must be respected. Authors are required to state their reasons for seeking publication in the form of a Letter when submitting their manuscript.