تقرير
Probing star formation in five of the most massive spiral galaxies observed through $\textit{ASTROSAT UltraViolet Imaging Telescope}$
| العنوان: | Probing star formation in five of the most massive spiral galaxies observed through $\textit{ASTROSAT UltraViolet Imaging Telescope}$ |
|---|---|
| المؤلفون: | Ray, Shankar, Dhiwar, Suraj, Bagchi, Joydeep, Pandge, M. B. |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | We present highly resolved and sensitive imaging of the five nearby massive spiral galaxies (with rotation velocities $\rm > 300 km s^{-1}$) observed by the UltraViolet Imaging Telescope onboard India's multi-wavelength astronomy satellite ASTROSAT, along with other archival observations. These massive spirals show a far-ultraviolet star formation rate in the range of $\sim$$\rm 1.4$$-$$\rm13.7 M_{\odot} yr^{-1}$ and fall in the `Green Valley' region with a specific star formation rate within $\sim$$\rm10^{-11.5}$$-$$\rm10^{-10.5}yr^{-1}$. Moreover, the mean star formation rate density of the highly resolved star-forming clumps of these objects are in the range $\rm 0.011$$-$$\rm 0.098 M_{\odot} yr^{-1}kpc^{-2}$, signifying localised star formation. From the spectral energy distributions, under the assumption of a delayed star formation model, we show that the star formation of these objects had peaked in the period of $\sim$ $\rm0.8$$-$$\rm2.8$ Gyr after the `Big Bang' and the object that has experienced the peak sooner after the `Big Bang' show relatively less star-forming activity at $\rm\it{z}$$\sim$0 and falls below the main-sequence relation for a stellar content of $\rm \gtrsim 10^{11} M_{\odot}$. We also show that these objects accumulated much of their stellar mass in the early period of evolution with $\sim31$$-$$42$ per cent of the total stellar mass obtained in a time of $(1/16)$$-$$(1/5)^{\rm th}$ the age of the Universe. We estimate that these massive objects convert their halo baryons into stars with efficiencies falling between $\sim 7-31$ percent. Comment: Accepted for publication in MNRAS |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2311.14274 |
| رقم الأكسشن: | edsarx.2311.14274 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |