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Probing star formation in five of the most massive spiral galaxies observed through $\textit{ASTROSAT UltraViolet Imaging Telescope}$ by Ray, Shankar; Dhiwar, Suraj; Bagchi, Joydeep; Pandge, M. B. is a scholarly article available to read on EtoBox.

What is Probing star formation in five of the most massive spiral galaxies observed through $\textit{ASTROSAT UltraViolet Imaging Telescope}$ about?

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 \gtr

Author

Ray, Shankar; Dhiwar, Suraj; Bagchi, Joydeep; Pandge, M. B.

Published

2023

Language

EN