Jessica Sutter, Karin Sandstrom, Ryan Chown, Oleg Egorov, Adam K. Leroy, Jérémy Chastenet, Alberto D. Bolatto, Thomas G. Williams, Daniel A. Dale, Amirnezam Amiri, Médéric Boquien, Yixian Cao, Simthembile Dlamini, Éric Emsellem, Hsi-An Pan, Debosmita Pathak, Hwihyun Kim, Ralf S. Klessen, Hannah Koziol, Erik Rosolowsky, Sumit K. Sarbadhicary, Eva Schinnerer, David A. Thilker, Leonardo Úbeda and Tony Weinbeck
{"title":"Characterization of Two Cool Galaxy Outflow Candidates Using Mid-infrared Emission from Polycyclic Aromatic Hydrocarbons","authors":"Jessica Sutter, Karin Sandstrom, Ryan Chown, Oleg Egorov, Adam K. Leroy, Jérémy Chastenet, Alberto D. Bolatto, Thomas G. Williams, Daniel A. Dale, Amirnezam Amiri, Médéric Boquien, Yixian Cao, Simthembile Dlamini, Éric Emsellem, Hsi-An Pan, Debosmita Pathak, Hwihyun Kim, Ralf S. Klessen, Hannah Koziol, Erik Rosolowsky, Sumit K. Sarbadhicary, Eva Schinnerer, David A. Thilker, Leonardo Úbeda and Tony Weinbeck","doi":"10.3847/2041-8213/ae08b7","DOIUrl":null,"url":null,"abstract":"We characterize two candidate cool galactic outflows in two relatively low-mass, highly inclined Virgo cluster galaxies: NGC 4424 and NGC 4694. Previous analyses of observations using the Atacama Large Millimeter/submillimeter Array carbon monoxide (CO) line emission maps did not classify these sources as cool outflow hosts. Using new high-sensitivity, high-spatial-resolution, JWST mid-infrared photometry in the polycyclic aromatic hydrocarbon (PAH)–tracing F770W band, we identify extended structures present off of the stellar disk. The identified structures are bright in the MIRI F770W and F2100W bands, suggesting they include PAHs as well as other dust grains. As PAHs have been shown to be destroyed in hot, ionized gas, these structures are likely to be outflows of cool (T ≤ 104 K) gas. This work represents an exciting possibility for using mid-infrared observations to identify and measure outflows in lower-mass, lower star formation galaxies.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"19 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Astrophysical Journal Letters","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3847/2041-8213/ae08b7","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
We characterize two candidate cool galactic outflows in two relatively low-mass, highly inclined Virgo cluster galaxies: NGC 4424 and NGC 4694. Previous analyses of observations using the Atacama Large Millimeter/submillimeter Array carbon monoxide (CO) line emission maps did not classify these sources as cool outflow hosts. Using new high-sensitivity, high-spatial-resolution, JWST mid-infrared photometry in the polycyclic aromatic hydrocarbon (PAH)–tracing F770W band, we identify extended structures present off of the stellar disk. The identified structures are bright in the MIRI F770W and F2100W bands, suggesting they include PAHs as well as other dust grains. As PAHs have been shown to be destroyed in hot, ionized gas, these structures are likely to be outflows of cool (T ≤ 104 K) gas. This work represents an exciting possibility for using mid-infrared observations to identify and measure outflows in lower-mass, lower star formation galaxies.
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