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GOALS-JWST: Revealing the Buried Star Clusters in the Luminous Infrared Galaxy VV 114

GOALS-JWST: Revealing the Buried Star Clusters in the Luminous Infrared Galaxy VV 114

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We present the results of a {\it James Webb Space Telescope} NIRCaminvestigation into the young massive star cluster (YMC) population in theluminous infrared galaxy VV 114. We identify 374 compact YMC candidates with a$S/N \geq 3$, 5, and 5 at F150W, F200W, and F356W respectively. A directcomparison with our {\it HST} cluster catalog reveals that $\sim 20\%$ of thesesources are undetected at optical wavelengths. Based on {\it yggdrasil} stellarpopulation models, we identify 17 YMC candidates in our {\it JWST} imagingalone with F150W-F200W and F200W-F356W colors suggesting they are all veryyoung, dusty ($A_{V} = 5 - 15$), and massive ($10^{5.8} < M_{\odot} <10^{6.1}$). The discovery of these `hidden' sources, many of which are found inthe `overlap' region between the two nuclei, quadruples the number of $t < 3$Myr clusters, and nearly doubles the number of $t < 6$ Myr clusters detected inVV 114. Now extending the cluster age distribution ($dN/d\tau \propto\tau^{\gamma}$) to the youngest ages, we find a slope of $\gamma = -1.30 \pm0.39$ for $10^{6} < \tau (\mathrm{yr}) < 10^{7}$, which is consistent with thepreviously determined value from $10^{7} < \tau (\mathrm{yr}) < 10^{8.5}$, andconfirms that VV 114 has a steep age distribution slope for all massive starclusters across the entire range of cluster ages observed. Finally, theconsistency between our {\it JWST}- and {\it HST}-derived age distributionslopes indicates that the balance between cluster formation and destruction hasnot been significantly altered in VV 114 over the last 0.5 Gyr.

We present the results of a {\it James Webb Space Telescope} NIRCaminvestigation into the young massive star cluster (YMC) population in theluminous infrared galaxy VV 114. We identify 374 compact YMC candidates with a$S/N \geq 3$, 5, and 5 at F150W, F200W, and F356W respectively. A directcomparison with our {\it HST} cluster catalog reveals that $\sim 20\%$ of thesesources are undetected at optical wavelengths. Based on {\it yggdrasil} stellarpopulation models, we identify 17 YMC candidates in our {\it JWST} imagingalone with F150W-F200W and F200W-F356W colors suggesting they are all veryyoung, dusty ($A_{V} = 5 - 15$), and massive ($10^{5.8} < M_{\odot} <10^{6.1}$). The discovery of these `hidden' sources, many of which are found inthe `overlap' region between the two nuclei, quadruples the number of $t < 3$Myr clusters, and nearly doubles the number of $t < 6$ Myr clusters detected inVV 114. Now extending the cluster age distribution ($dN/d\tau \propto\tau^{\gamma}$) to the youngest ages, we find a slope of $\gamma = -1.30 \pm0.39$ for $10^{6} < \tau (\mathrm{yr}) < 10^{7}$, which is consistent with thepreviously determined value from $10^{7} < \tau (\mathrm{yr}) < 10^{8.5}$, andconfirms that VV 114 has a steep age distribution slope for all massive starclusters across the entire range of cluster ages observed. Finally, theconsistency between our {\it JWST}- and {\it HST}-derived age distributionslopes indicates that the balance between cluster formation and destruction hasnot been significantly altered in VV 114 over the last 0.5 Gyr.

Loreto Barcos-Muñoz、Anne M. Medling、Thomas Lai、Philip Appleton、Francisca Kemper、David Sanders、Jeffrey A. Rich、Sabrina Stierwalt、Yiqing Song、Kazushi Iwasawa、Tanio Diaz-Santos、Eric J. Murphy、Justin H. Howell、Vivian U、David Law、Sean T. Linden、Jason Surace、Susanne Aalto、Vassilis Charmandaris、Lee Armus、Hanae Inami、Aaron S. Evans、Jason Marshall、David T. Frayer、Matthew A. Malkan、Thomas Bohn、Christopher C. Hayward、Joseph M. Mazzarella、Torsten Böker、Kirsten L. Larson、Michael J. I. Brown、Paul van der Werf、George C. Privon

天文学

Loreto Barcos-Muñoz,Anne M. Medling,Thomas Lai,Philip Appleton,Francisca Kemper,David Sanders,Jeffrey A. Rich,Sabrina Stierwalt,Yiqing Song,Kazushi Iwasawa,Tanio Diaz-Santos,Eric J. Murphy,Justin H. Howell,Vivian U,David Law,Sean T. Linden,Jason Surace,Susanne Aalto,Vassilis Charmandaris,Lee Armus,Hanae Inami,Aaron S. Evans,Jason Marshall,David T. Frayer,Matthew A. Malkan,Thomas Bohn,Christopher C. Hayward,Joseph M. Mazzarella,Torsten Böker,Kirsten L. Larson,Michael J. I. Brown,Paul van der Werf,George C. Privon.GOALS-JWST: Revealing the Buried Star Clusters in the Luminous Infrared Galaxy VV 114[EB/OL].(2023-02-19)[2025-08-03].https://chinaxiv.org/abs/202303.02411.点此复制

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