6 research outputs found
The intrinsic reddening of the Magellanic Clouds as traced by background galaxies -- II. The Small Magellanic Cloud
We present a map of the total intrinsic reddening across ~34 deg of the
Small Magellanic Cloud (SMC) derived using optical () and near-infrared
(IR; ) spectral energy distributions (SEDs) of background
galaxies. The reddening map is created using a subsample of 29,274 galaxies
with low levels of intrinsic reddening based on the LePhare
minimisation SED-fitting routine. We find statistically significant enhanced
levels of reddening associated with the main body of the SMC compared with
regions in the outskirts [ mag]. A comparison with
literature reddening maps of the SMC shows that, after correcting for
differences in the volume of the SMC sampled, there is good agreement between
our results and maps created using young stars. In contrast, we find
significant discrepancies between our results and maps created using old stars
or based on longer wavelength far-IR dust emission that could stem from biased
samples in the former and uncertainties in the far-IR emissivity and the
optical properties of the dust grains in the latter. This study represents one
of the first large-scale categorisations of extragalactic sources behind the
SMC and as such we provide the LePhare outputs for our full sample of ~500,000
sources.Comment: Accepted for publication in MNRAS, 13 pages, 6 figures and 4 tables.
Tables 1, 3 and 4 will be available in full as Supporting Information in the
online version of the articl
The intrinsic reddening of the Magellanic Clouds as traced by background galaxies – II. The Small Magellanic Cloud
We present a map of the total intrinsic reddening across ≃34 deg2 of the Small Magellanic Cloud (SMC) derived using optical (ugriz) and near-infrared (IR; YJKs) spectral energy distributions (SEDs) of background galaxies. The reddening map is created using a subsample of 29 274 galaxies with low levels of intrinsic reddening based on the LEPHARE χ2 minimization SED-fitting routine. We find statistically significant enhanced levels of reddening associated with the main body of the SMC compared with regions in the outskirts [ΔE(B − V) ≃ 0.3 mag]. A comparison with literature reddening maps of the SMC shows that, after correcting for differences in the volume of the SMC sampled, there is good agreement between our results and maps created using young stars. In contrast, we find significant discrepancies between our results and maps created using old stars or based on longer wavelength far-IR dust emission that could stem from biased samples in the former and uncertainties in the far-IR emissivity and the optical properties of the dust grains in the latter. This study represents one of the first large-scale categorizations of extragalactic sources behind the SMC and as such we provide the LEPHARE outputs for our full sample of ∼500 000 sources