Dust Properties of [CII] Detected z $\sim$ 5.5 Galaxies: New HST/WFC3 Near-IR Observations

Abstract

We examine the rest-frame ultra-violet (UV) properties of 10 [CII]$\lambda 158\mu \mathrm{m}$$-$detected galaxies at $z\sim 5.5$ in COSMOS using new HST/WFC3 near-infrared imaging. Together with pre-existing $158\mu \mathrm{m}-$continuum and [CII] line measurements by ALMA, we study their dust attenuation properties on the IRX-$\beta$ diagram, which connects the total dust emission ($\propto$ IRX=log($L_{FIR}/L_{1600}$)) to the line-of-sight dust column ($\propto \beta$). We find systematically bluer UV continuum spectral slopes ($\beta$) compared to previous low-resolution ground-based measurements, which relieves some of the tension between models of dust attenuation and observations at high redshifts. While most of the galaxies are consistent with local starburst or Small Magellanic cloud like dust properties, we find galaxies with low IRX values and a large range in $\beta$ that cannot be explained by models of a uniform dust distribution well mixed with stars. A stacking analysis of Keck/DEIMOS optical spectra indicates that these galaxies are metal-poor with young stellar populations which could significantly alter their spatial dust distribution.

9 pages, 3 figures, 1 table. Accepted for publication in The Astrophysical Journal

References in corpus (9)

• The Cosmic Evolution Survey (COSMOS) -- Overview
• Combined CO & Dust Scaling Relations of Depletion Time and Molecular Gas Fractions with Cosmic Time, Specific Star Formation Rate and Stellar Mass
• Strong Nebular Line Ratios in the Spectra of z~2-3 Star-forming Galaxies: First Results from KBSS-MOSFIRE
• A dusty, normal galaxy in the epoch of reionization
• ALMA Imaging of Gas and Dust in a Galaxy Protocluster at Redshift 5.3: [CII] Emission in "Typical" Galaxies and Dusty Starbursts ~1 Billion Years after the Big Bang
• Are Dusty Galaxies Blue? Insights on UV Attenuation from Dust-Selected Galaxies
• New constraints on dust emission and UV attenuation of z=6.5-7.5 galaxies from millimeter observations
• ALMA Reveals Weak [NII] Emission in "Typical" Galaxies and Intense Starbursts at z=5-6
• ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: implications for spectral line intensity mapping at millimeter wavelengths and CMB spectral distortions

Cited by in corpus (34)

• The Dust Attenuation Law in Galaxies
• High-redshift star formation in the ALMA era
• ALMA uncovers the [CII] emission and warm dust continuum in a z = 8.31 Lyman break galaxy
• The ALMA Spectroscopic Survey Large Program: The Infrared Excess of z=1.5-10 UV-selected Galaxies and the Implied High-Redshift Star Formation History
• Deep into the structure of the first galaxies: SERRA views
• Dust attenuation, dust emission, and dust temperature in galaxies at z>=5: a view from the FIRE-2 simulations
• The REBELS ALMA Survey: cosmic dust temperature evolution out to z $\sim$ 7
• The ALMA REBELS Survey: Dust Continuum Detections at z > 6.5
• The ALPINE-ALMA [CII] survey: Dust attenuation properties and obscured star formation at z~4.4-5.8
• Are high redshift Galaxies hot? - Temperature of z > 5 Galaxies and Implications on their Dust Properties
• ALMA reveals metals yet no dust within multiple components in CR7
• A survey of high-$z$ galaxies: SERRA simulations
• A kiloparsec view of a typical star-forming galaxy when the Universe was ~1 Gyr old. Part I. Outflow, halo, and interstellar medium properties
• Accurate dust temperature determination in a $z=7.13$ galaxy
• Warm dust in high-z galaxies: origin and implications
• Dust temperature in ALMA $\hbox{[C $\scriptstyle\rm II $]}$-detected high-$z$ galaxies
• Significant Dust-Obscured Star Formation in Luminous Lyman-break Galaxies at $z$$\sim$$7$$-$$8$
• The discovery of rest-frame UV colour gradients and a diversity of dust morphologies in bright z ~ 7 Lyman-break galaxies
• A new look at the infrared properties of z $\sim$ 5 galaxies
• The IRX-$\beta$ relation of high-redshift galaxies
• Diversity of Galaxy Dust Attenuation Curves Drives the Scatter in the IRX-beta Relation
• The ALPINE-ALMA [CII] survey: dust attenuation curves at z=4.4-5.5
• Using [CII] 158 micron Emission From Isolated ISM Phases as a Star-Formation Rate Indicator
• An extended [CII] halo around a massive star-forming galaxy at z = 5.3
• Early galaxy growth: mergers or gravitational instability?
• JWST PRIMER: A lack of outshining in four normal z =4-6 galaxies from the ALMA-CRISTAL Survey
• Dust Attenuation Curves at z $\sim$ 0.8 from LEGA-C: Precise Constraints on the Slope and 2175$\mathring{A}$ Bump Strength
• The interstellar medium of high-redshift galaxies: Gathering clues from C III] and [C II] lines
• The ALMA Frontier Fields survey V: ALMA Stacking of Lyman-Break Galaxies in Abell 2744, Abell 370, Abell S1063, MACSJ0416.1-2403 and MACSJ1149.5+2223
• Tomography of the environment of the COSMOS/AzTEC-3 submillimeter galaxy at z=5.3 revealed by Lyalpha and MUSE observations
• ALPINE: A Large Survey to Understand Teenage Galaxies
• Dust emission from the bulk of galaxies at the Epoch of Reionization
• First Light And Reionisation Epoch Simulations (FLARES) III: The properties of massive dusty galaxies at cosmic dawn
• Far-infrared observations of dust in Ly$\alpha$ emitters at z=2-6