GOALS-JWST: Constraining the Emergence Timescale for Massive Star Clusters in NGC 3256
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| Format: | Preprint |
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2024
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| author | Linden, Sean T. Lai, Thomas Evans, Aaron S. Armus, Lee Larson, Kirsten L. Rich, Jeffrey A. U, Vivian Privon, George C. Inami, Hanae Song, Yiqing Bianchin, Marina Bohn, Thomas Buiten, Victorine A. Sanchez-Garcia, Maria Kader, Justin Lenkic, Laura Medling, Anne M. Boeker, Torsten Diaz-Santos, Tanio Charmandaris, Vassilis Barcos-Munoz, Loreto van der Werf, Paul Stierwalt, Sabrina Aalto, Susanne Appleton, Philip Hayward, Christopher C. Howell, Justin H. Malkan, Matthew A. Mazzarella, Joseph M. Murphy, Eric J. Surace, Jason |
| author_facet | Linden, Sean T. Lai, Thomas Evans, Aaron S. Armus, Lee Larson, Kirsten L. Rich, Jeffrey A. U, Vivian Privon, George C. Inami, Hanae Song, Yiqing Bianchin, Marina Bohn, Thomas Buiten, Victorine A. Sanchez-Garcia, Maria Kader, Justin Lenkic, Laura Medling, Anne M. Boeker, Torsten Diaz-Santos, Tanio Charmandaris, Vassilis Barcos-Munoz, Loreto van der Werf, Paul Stierwalt, Sabrina Aalto, Susanne Appleton, Philip Hayward, Christopher C. Howell, Justin H. Malkan, Matthew A. Mazzarella, Joseph M. Murphy, Eric J. Surace, Jason |
| contents | We present the results of a James Webb Space Telescope (JWST) NIRCam and NIRSpec investigation into the young massive star cluster (YMC) population of NGC 3256, the most cluster-rich luminous infrared galaxy (LIRG) in the Great Observatories All Sky LIRG Survey. We detect 3061 compact YMC candidates with a $S/N \geq 3$ at F150W, F200W, and F335M. Based on yggdrasil stellar population models, we identify 116/3061 sources with F150W - F200W $> 0.47$ and F200W - F355M $> -1.37$ colors suggesting they are young (t $\leq 5$ Myr), dusty ($A_{V} = 5 - 15$), and massive ($M_{\odot} > 10^{5}$). This increases the sample of dust-enshrouded YMCs detected in this system by an order of magnitude relative to previous HST studies. With NIRSpec IFU pointings centered on the northern and southern nucleus, we extract the Pa$α$ and 3.3$μ$m PAH equivalent widths for 8 bright and isolated YMCs. Variations in both the F200W - F335M color and 3.3$μ$m PAH emission with the Pa$α$ line strength suggest a rapid dust clearing ($< 3 - 4$ Myr) for the emerging YMCs in the nuclei of NGC 3256. Finally, with both the age and dust emission accurately measured we use yggdrasil to derive the color excess (E(B - V)) for all 8 YMCs. We demonstrate that YMCs with strong 3.3$μ$m PAH emission (F200W - F335M $> 0$) correspond to sources with E(B - V) $> 3$, which are typically missed in UV-optical studies. This underscores the importance of deep near-infrared imaging for finding and characterizing these very young and dust-embedded sources. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_16503 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | GOALS-JWST: Constraining the Emergence Timescale for Massive Star Clusters in NGC 3256 Linden, Sean T. Lai, Thomas Evans, Aaron S. Armus, Lee Larson, Kirsten L. Rich, Jeffrey A. U, Vivian Privon, George C. Inami, Hanae Song, Yiqing Bianchin, Marina Bohn, Thomas Buiten, Victorine A. Sanchez-Garcia, Maria Kader, Justin Lenkic, Laura Medling, Anne M. Boeker, Torsten Diaz-Santos, Tanio Charmandaris, Vassilis Barcos-Munoz, Loreto van der Werf, Paul Stierwalt, Sabrina Aalto, Susanne Appleton, Philip Hayward, Christopher C. Howell, Justin H. Malkan, Matthew A. Mazzarella, Joseph M. Murphy, Eric J. Surace, Jason Astrophysics of Galaxies We present the results of a James Webb Space Telescope (JWST) NIRCam and NIRSpec investigation into the young massive star cluster (YMC) population of NGC 3256, the most cluster-rich luminous infrared galaxy (LIRG) in the Great Observatories All Sky LIRG Survey. We detect 3061 compact YMC candidates with a $S/N \geq 3$ at F150W, F200W, and F335M. Based on yggdrasil stellar population models, we identify 116/3061 sources with F150W - F200W $> 0.47$ and F200W - F355M $> -1.37$ colors suggesting they are young (t $\leq 5$ Myr), dusty ($A_{V} = 5 - 15$), and massive ($M_{\odot} > 10^{5}$). This increases the sample of dust-enshrouded YMCs detected in this system by an order of magnitude relative to previous HST studies. With NIRSpec IFU pointings centered on the northern and southern nucleus, we extract the Pa$α$ and 3.3$μ$m PAH equivalent widths for 8 bright and isolated YMCs. Variations in both the F200W - F335M color and 3.3$μ$m PAH emission with the Pa$α$ line strength suggest a rapid dust clearing ($< 3 - 4$ Myr) for the emerging YMCs in the nuclei of NGC 3256. Finally, with both the age and dust emission accurately measured we use yggdrasil to derive the color excess (E(B - V)) for all 8 YMCs. We demonstrate that YMCs with strong 3.3$μ$m PAH emission (F200W - F335M $> 0$) correspond to sources with E(B - V) $> 3$, which are typically missed in UV-optical studies. This underscores the importance of deep near-infrared imaging for finding and characterizing these very young and dust-embedded sources. |
| title | GOALS-JWST: Constraining the Emergence Timescale for Massive Star Clusters in NGC 3256 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2409.16503 |