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19 April 2024 |
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CLEAR: Paschen-$β$ Star Formation Rates and Dust Attenuation of Low Redshift Galaxies | | Nikko J. Cleri
; Jonathan R. Trump
; Bren E. Backhaus
; Ivelina Momcheva
; Casey Papovich
; Raymond Simons
; Benjamin Weiner
; Vicente Estrada-Carpenter
; Steven L. Finkelstein
; Mauro Giavalisco
; Zhiyuan Ji
; Intae Jung
; Jasleen Matharu
; Megan R. Sturm
; | | Date: |
1 Sep 2020 | | Abstract: | We use Pa$eta$ (1282~nm) observations from the Hubble Space Telescope
($ extit{HST}$) G141 grism to study the star formation and dust attenuation
properties of a sample of 32 low redshift ($z < 0.287$) galaxies in the CLEAR
survey. Many of the galaxies in the sample have significantly higher Pa$eta$
emission than expected from the star formation rates (SFRs) measured from their
(attenuation-corrected) UV continuum or H$alpha$ emission, suggesting that
Pa$eta$ is revealing star formation that is otherwise hidden within gas that
is optically thick to UV-continuum and Balmer line emission. Galaxies with
lower stellar mass tend to have more scatter in their ratio of Pa$eta$ to
attenuation-corrected UV SFRs. When considering our Pa$eta$ detection limits,
this observation is consistent with burstier star formation histories in lower
mass galaxies. We also find a large amount of scatter between the nebular dust
attenuation measured by Pa$eta$/H$alpha$ and H$alpha$/H$eta$, implying
that the Balmer decrement underestimates the attenuation in galaxies across a
broad range of stellar mass, morphology, and observed Balmer decrement.
Comparing the nebular attenuation from Pa$eta$/H$alpha$ with the stellar
attenuation inferred from the spectral energy distribution, our galaxies are
consistent with an average stellar to nebular ratio of 0.44, but with a large
amount of excess scatter beyond the observational uncertainties. Together,
these results show that Pa$eta$ is a valuable tracer of a galaxy’s star
formation rate, often revealing star formation that is otherwise missed by UV
and optical tracers. | | Source: | arXiv, 2009.00617 | | Services: | Forum | Review | PDF | Favorites | |
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