Dashing through the cluster: An X-ray to radio view of UGC 10420 undergoing ram-pressure stripping

IF 5.4 3区材料科学 Q2 CHEMISTRY, PHYSICAL

ACS Applied Energy Materials Pub Date : 2023-02-04 DOI:10.1017/pasa.2023.6

S. Mahajan, K. Singh, J. Tiwari, Somak Raychaudhury

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Abstract

Abstract We present multi-wavelength data and analysis, including new FUV AstroSat/UVIT observations of the spiral galaxy UGC 10420 ( $z=0.032$ ), a member of the cluster Abell 2199. UGC 10420 is present on the edge of the X-ray emitting region of the cluster at a distance of ${\sim} 680$ kpc from the centre. The far-ultraviolet (FUV) data obtained by the AstroSat mission show intense knots of star formation on the leading edge of the galaxy, accompanied by a tail of the same on the diametrically opposite side. Our analysis shows that the images of the galaxy disc in the optical and mid-infrared are much smaller in size than that in the FUV. While the broadband optical colours of UGC 10420 are typical of a post-starburst galaxy, the star formation rate (SFR) derived from a UV-to-IR spectral energy distribution is at least a factor of nine higher than that expected for a star-forming field galaxy of similar mass at its redshift. A careful removal of the contribution of the diffuse intracluster gas shows that the significant diffuse X-ray emission associated with the interstellar medium of UGC 10420 has a temperature, $T_X = 0.24^{+0.09}_{-0.06}$ keV (0.4–2.0 keV) and luminosity, $L_X = 1.8\pm{0.9}\times 10^{40}$ erg s $^{-1}$ , which are typical of the X-ray emission from late-type spiral galaxies. Two symmetrically placed X-ray hot spots are observed on either sides of an X-ray weak nucleus. Our analysis favours a scenario where the interaction of a galaxy with the hot intracluster medium of the cluster, perturbs the gas in the galaxy causing starburst in the leading edge of the disc. On the other hand, the turbulence thus developed may also push some of the gas out of the disc. Interactions between the gas ejected from the galaxy and the intracluster medium can then locally trigger star formation in the wake of the galaxy experiencing ram-pressure stripping. Our data however does not rule out the possibility of a flyby encounter with a neighbouring galaxy, although no relevant candidates are observed in the vicinity of UGC 10420.

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冲过星系团:UGC 10420正经历撞击压力剥离的x射线到射电图像

摘要:本文提出了多波长数据和分析，包括对Abell 2199星系团成员UGC 10420 ($z=0.032$)的新的FUV AstroSat/UVIT观测。UGC 10420位于星团x射线发射区域的边缘，距离中心约680 kpc。由AstroSat任务获得的远紫外线(FUV)数据显示，在星系的前缘有强烈的恒星形成结，在星系的完全相反的一侧有一条相同的尾巴。我们的分析表明，星系盘在光学和中红外波段的图像比在FUV波段的图像要小得多。虽然UGC 10420的宽带光学颜色是典型的星暴后星系，但从紫外到红外光谱能量分布得出的恒星形成率(SFR)至少比红移时类似质量的恒星形成场星系的预期高9倍。仔细去除星系团内弥漫性气体的贡献表明，与UGC 10420星际介质相关的显著弥漫性x射线辐射具有温度$T_X = 0.24^{+0.09}_{-0.06}$ keV (0.4-2.0 keV)和光度$L_X = 1.8\pm{0.9}\乘以10^{40}$ erg s $^{-1}$，这是典型的晚型螺旋星系x射线辐射。在x射线弱核的两侧观察到两个对称放置的x射线热点。我们的分析倾向于这样一种情况:星系与星团内热介质的相互作用扰乱了星系内的气体，导致了星盘前缘的星暴。另一方面，由此产生的湍流也可能把一些气体推出圆盘。从星系喷射出的气体和星系团内介质之间的相互作用可以在星系经历撞击压力剥离后局部触发恒星形成。然而，我们的数据并不排除与邻近星系相遇的可能性，尽管在UGC 10420附近没有观测到相关的候选星系。

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来源期刊

ACS Applied Energy Materials Materials Science-Materials Chemistry

CiteScore

10.30

自引率

6.20%

发文量

1368

期刊介绍： ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.