Diversity of Galaxy Dust Attenuation Curves Drives the Scatter in the IRX–β Relation

Salim, Samir; Boquien, M.

doi:10.3847/1538-4357/aaf88a

Cited by 41 publications

(52 citation statements)

References 119 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We conclude that one of the main drivers to shape the IRX-β UV plane is the dust attenuation curves, as previous studies in other galaxy population (e.g. Salmon et al 2016;Lo Faro et al 2017;Salim & Boquien 2019).…”

Section: Irx-β Uv Plane and The Slope Of The Dust Attenuation Curvesupporting

confidence: 89%

Rest-frame far-ultraviolet to far-infrared view of Lyman break galaxies at z = 3: Templates and dust attenuation

Álvarez-Márquez

Burgarella

Buat

et al. 2019

A&A

View full text Add to dashboard Cite

Aims. This work explores from a statistical point of view the rest-frame far-ultraviolet (FUV) to far-infrared (FIR) emission of a population of Lyman break galaxies (LBGs) at z ∼ 3 that cannot be individually detected from current FIR observations. Methods. We perform a stacking analysis over a sample of ∼17000 LBGs at redshift 2.5 < z < 3.5 in the COSMOS field. The sample is binned as a function of UV luminosity (L FUV ), UV continuum slope (β UV ), and stellar mass (M * ), and then, stacked at optical (BVriz bands), near-infrared (Y JHK s bands), IRAC (3.6, 4.5, 5.6 and 8.0 µm), MIPS (24µm), PACS (100 and 160 µm), SPIRE (250, 350, and 500 µm), and AzTEC (1.1mm) observations. We obtain thirty rest-frame FUV-to-FIR spectral energy distribution (SEDs) of LBGs at z ∼ 3, and analyze them with CIGALE SED-fitting analysis code. We are able to derive fully consistent physical parameters (M * , β UV , L FUV , L IR , A FUV , SFR, and slope of the dust attenuation law), and build a semi-empirical library of thirty rest-frame FUV-to-FIR stacked LBG SEDs as a function of L FUV , β UV , and M * . Results. We used the so-called IR-excess (IRX ≡ L IR /L FUV ) to investigate the dust attenuation as a function of β UV and M * . Our LBGs, averaged as a function of β UV , follow the well known IRX-β UV calibration of local starburst galaxies. They, stacked as a function of M * , are in agreement with previous IRX-M * relationship presented on the literature at high M * (log(M * [M ])> 10). However, a large dispersion is shown in the IRX-β UV and IRX-M * planes, when the β UV and M * are combined to average the sample. Additionally, the SED-fitting analysis results provide a diversity of dust attenuation curve along the LBG sample, and their slope are well correlated with M * . Stepper dust attenuations curves than Calzetti's are favoured in low stellar mass LBGs (log(M * [M ]) < 10.25), while grayer ones are favoured in high stellar mass LBGs (log(M * [M ]) > 10.25). We also demonstrate that the slope of the dust attenuation curves is one of the main drivers to shape the IRX-β UV plane.

show abstract

Section: Irx-β Uv Plane and The Slope Of The Dust Attenuation Curvesupporting

confidence: 89%

Rest-frame far-ultraviolet to far-infrared view of Lyman break galaxies at z = 3: Templates and dust attenuation

Álvarez-Márquez

Burgarella

Buat

et al. 2019

A&A

View full text Add to dashboard Cite

show abstract

“…The relation, considering it is sensitive to the dust attenuation, has been thoroughly analysed for a wide range of redshifts (e.g. Meurer et al 1999;Kong et al 2004;Overzier et al 2011;Boquien et al 2012;Salim & Boquien 2019). The relation demonstrates that starbursting galaxies have redder UV (towards positive β values) colour if more UV radiation is reprocessed by dust.…”

Section: The Eagle Simulations and The Skirt Post-processingmentioning

confidence: 99%

Reproducing the Universe: a comparison between the EAGLE simulations and the nearby DustPedia galaxy sample

Trčka

Baes

Camps

et al. 2020

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

We compare the spectral energy distributions (SEDs) and inferred physical properties for simulated and observed galaxies at low redshift. We exploit UV-submillimetre mock fluxes of ∼ 7000 z=0 galaxies from the EAGLE suite of cosmological simulations, derived using the radiative transfer code skirt. We compare these to ∼ 800 observed galaxies in the UV-submillimetre range, from the DustPedia sample of nearby galaxies. To derive global properties, we apply the SED fitting code cigale consistently to both data sets, using the same set of ∼ 80 million models. The results of this comparison reveal overall agreement between the simulations and observations, both in the SEDs and in the derived physical properties, with a number of discrepancies. The optical and far-infrared regimes, and the scaling relations based upon the global emission, diffuse dust and stellar mass, show high levels of agreement. However, the mid-infrared fluxes of the EAGLE galaxies are overestimated while the far-UV domain is not attenuated enough, compared to the observations. We attribute these discrepancies to a combination of galaxy population differences between the samples, and limitations in the subgrid treatment of star-forming regions in the EAGLE-skirt post-processing recipe. Our findings show the importance of detailed radiative transfer calculations and consistent comparison, and provide suggestions for improved numerical models.

show abstract

“…Although the most extreme outliers may simply reflect a fundamental mismatch between the emission regions traced by the less-obscured UV and more-obscured FIR emission (Goldader et al 2002;Trentham et al 1999). More recently, it has been shown that the scatter in the IRX-β relation may be driven by the diversity in the corresponding attenuation curves (Salmon et al 2016;Salim & Boquien 2019).…”

Section: Introductionmentioning

confidence: 99%

An ALMA survey of the SCUBA-2 cosmology legacy survey UKIDSS/UDS field: Dust attenuation in high-redshift Lyman-break galaxies

Koprowski

Coppin

Dudzevičiūtė

et al. 2020

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

We analyse 870µm Atacama Large Millimetre Array (ALMA) dust continuum detections of 41 canonically-selected z 3 Lyman-break galaxies (LBGs), as well as 209 ALMA-undetected LBGs, in follow-up of SCUBA-2 mapping of the UKIDSS Ultra Deep Survey (UDS) field. We find that our ALMA-bright LBGs lie significantly off the locally calibrated IRX-beta relation and tend to have relatively bluer rest-frame UV slopes (as parametrised by β), given their high values of the 'infrared excess' (IRX ≡ L IR /L UV ), relative to the average 'local' IRX-β relation. We attribute this finding in part to the young ages of the underlying stellar populations but we find that the main reason behind the unusually blue UV slopes are the relatively shallow slopes of the corresponding dust attenuation curves. We show that, when stellar masses, M * , are being established via SED fitting, it is absolutely crucial to allow the attenuation curves to vary (rather than fixing it on Calzetti-like law), where we find that the inappropriate curves may underestimate the resulting stellar masses by a factor of 2-3× on average. In addition, we find these LBGs to have relatively high specific star-formation rates (sSFRs), dominated by the dust component, as quantified via the fraction of obscured star formation ( f obs ≡ SFR IR /SFR UV+IR ). We conclude that the ALMA-bright LBGs are, by selection, massive galaxies undergoing a burst of a star formation (large sSFRs, driven, for example, by secular or merger processes), with a likely geometrical disconnection of the dust and stars, responsible for producing shallow dust attenuation curves.

show abstract

Diversity of Galaxy Dust Attenuation Curves Drives the Scatter in the IRX–β Relation

Cited by 41 publications

References 119 publications

Rest-frame far-ultraviolet to far-infrared view of Lyman break galaxies at z = 3: Templates and dust attenuation

Rest-frame far-ultraviolet to far-infrared view of Lyman break galaxies at z = 3: Templates and dust attenuation

Reproducing the Universe: a comparison between the EAGLE simulations and the nearby DustPedia galaxy sample

An ALMA survey of the SCUBA-2 cosmology legacy survey UKIDSS/UDS field: Dust attenuation in high-redshift Lyman-break galaxies

Contact Info

Product

Resources

About