
Star Formation in a Barred Spiral Galaxy in Simulations Shu Horie Takashi Okamoto (Hokkaido University) 1. Introduction gas surface density ] higher SFE Σ"#$ = 2 − Σ = SFR surface density pc &'( 1 − yr lower SFE Star formation efficiency • <latexit sha1_base64="G8DtF65e40CEDKJkPXhFwA2CtXs=">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</latexit> [M 1 2 1 ⌃SFR [M yr− pc− ] SFE [yr− ]= ⌃ [M pc 2] <latexit 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gas − SFR ⌃ • SFE in bar is lower than in <latexit sha1_base64="UWXDvfmBDcyEmBctqFpjE2oX97g=">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</latexit> log spiral arms. 2 This mechanism is not well [M pc− ] Ø log ⌃ <latexit 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(2010) understood yet. 1. Introduction Perform a simulation of a barred spiral galaxy the star formation criteria used in cosmological simulations Estimate SFE in bar and arm region Investigate whether the star formation criteria used in cosmological simulations can reproduce the observational result of barred spiral galaxies. 2. Simulation • Code : GIZMO (Hopkins 2015) • Barred spiral galaxy Øgalactic potentials <latexit sha1_base64="VOOXJHgPgoxbI6JCxs36i7wSNmg=">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</latexit> <latexit sha1_base64="c5lfvy+UXgTry2CGOVQ/s0/v8c8=">AAAClnichVHLTsJAFL3UF+ID1A2JGyLBuCJTNNG4MERjdFlAHgmQpq0jTOgrbSFBwg/4Ay5YaWRh/AH3bvwBF3yCcYmJGxfeliZGiXib6Zw5c8+dM3NlU2W2Q8ggwE1Nz8zOBedDC4tLy+HIymrBNpqWQvOKoRpWSZZsqjKd5h3mqLRkWlTSZJUW5caRu19sUctmhn7mtE1a1aSazi6YIjlIiZFwRagzsVOxtFhdUo2uGImTJPEiNg54H8TBD8GIPEIFzsEABZqgAQUdHMQqSGDjVwYeCJjIVaGDnIWIefsUuhBCbROzKGZIyDbwX8NV2Wd1XLs1bU+t4CkqDguVMUiQF3JPhuSZPJBX8vlnrY5Xw/XSxlkeaakphq+iuY9/VRrODtS/VRM9O3ABe55Xht5Nj3FvoYz0rcvrYW4/m+hsklvyhv5vyIA84Q301rvSz9Bsb4IfGb24LxbCFvG/GzIOCqkkv51MZXbi6UO/WUFYhw3Ywo7sQhpOQYC817Ue3EGfi3IH3DF3MkrlAr5mDX4EJ3wBC+mWIA==</latexit> <latexit sha1_base64="VOOXJHgPgoxbI6JCxs36i7wSNmg=">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</latexit> <latexit sha1_base64="VOOXJHgPgoxbI6JCxs36i7wSNmg=">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</latexit> <latexit sha1_base64="VOOXJHgPgoxbI6JCxs36i7wSNmg=">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</latexit> Φ <latexit sha1_base64="oYKpLYOhDvbpQrk8rXX17FEAW6Y=">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</latexit> Φ + Φ<latexit sha1_base64="3SFJVnH6ef/OKTV+nUW3Da2OqsM=">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</latexit>
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