The intrinsic reddening of the Magellanic Clouds as traced by background galaxies - II. The Small Magellanic Cloud

Cameron P.M. Bell; Maria Rosa L. Cioni; A. H. Wright; Stefano Rubele; David L. Nidever; Ben L. Tatton; Jacco Th Van Loon; Dennis Zaritsky; Yumi Choi; Samyaday Choudhury; Gisella Clementini; Richard De Grijs; Valentin D. Ivanov; Steven R. Majewski; Marcella Marconi; David Martínez-Delgado; Pol Massana; Ricardo R.Ñoz Mu; Florian Niederhofer; Noelia E.D. Noël; Joana M. Oliveira; Knut Olsen; Clara M. Pennock; V. Ripepi; Smitha Subramanian; A. Katherina Vivas

doi:10.1093/mnras/staa2786

The intrinsic reddening of the Magellanic Clouds as traced by background galaxies - II. The Small Magellanic Cloud

Cameron P.M. Bell, Maria Rosa L. Cioni, A. H. Wright, Stefano Rubele, David L. Nidever, Ben L. Tatton, Jacco Th Van Loon, Dennis Zaritsky, Yumi Choi, Samyaday Choudhury, Gisella Clementini, Richard De Grijs, Valentin D. Ivanov, Steven R. Majewski, Marcella Marconi, David Martínez-Delgado, Pol Massana, Ricardo R.Ñoz Mu, Florian Niederhofer, Noelia E.D. NoëlJoana M. Oliveira, Knut Olsen, Clara M. Pennock, V. Ripepi, Smitha Subramanian, A. Katherina Vivas

Astronomy

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10 Scopus citations

Abstract

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) ≃ 0.3mag]. 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.

Original language	English (US)
Pages (from-to)	993-1004
Number of pages	12
Journal	Monthly Notices of the Royal Astronomical Society
Volume	499
Issue number	1
DOIs	https://doi.org/10.1093/mnras/staa2786
State	Published - Nov 1 2020

Keywords

Dust, extinction
Galaxies: ISM-Magellanic Clouds
Galaxies: photometry
Surveys

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/mnras/staa2786

Cite this

Bell, C. P. M., Cioni, M. R. L., Wright, A. H., Rubele, S., Nidever, D. L., Tatton, B. L., Van Loon, J. T., Zaritsky, D., Choi, Y., Choudhury, S., Clementini, G., De Grijs, R., Ivanov, V. D., Majewski, S. R., Marconi, M., Martínez-Delgado, D., Massana, P., Mu, R. R. Ñ., Niederhofer, F., ... Vivas, A. K. (2020). The intrinsic reddening of the Magellanic Clouds as traced by background galaxies - II. The Small Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 499(1), 993-1004. https://doi.org/10.1093/mnras/staa2786

Bell, CPM, Cioni, MRL, Wright, AH, Rubele, S, Nidever, DL, Tatton, BL, Van Loon, JT, Zaritsky, D, Choi, Y, Choudhury, S, Clementini, G, De Grijs, R, Ivanov, VD, Majewski, SR, Marconi, M, Martínez-Delgado, D, Massana, P, Mu, RRÑ, Niederhofer, F, Noël, NED, Oliveira, JM, Olsen, K, Pennock, CM, Ripepi, V, Subramanian, S & Vivas, AK 2020, 'The intrinsic reddening of the Magellanic Clouds as traced by background galaxies - II. The Small Magellanic Cloud', Monthly Notices of the Royal Astronomical Society, vol. 499, no. 1, pp. 993-1004. https://doi.org/10.1093/mnras/staa2786

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title = "The intrinsic reddening of the Magellanic Clouds as traced by background galaxies - II. The Small Magellanic Cloud",

abstract = "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) ≃ 0.3mag]. 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.",

keywords = "Dust, extinction, Galaxies: ISM-Magellanic Clouds, Galaxies: photometry, Surveys",

author = "Bell, {Cameron P.M.} and Cioni, {Maria Rosa L.} and Wright, {A. H.} and Stefano Rubele and Nidever, {David L.} and Tatton, {Ben L.} and {Van Loon}, {Jacco Th} and Dennis Zaritsky and Yumi Choi and Samyaday Choudhury and Gisella Clementini and {De Grijs}, Richard and Ivanov, {Valentin D.} and Majewski, {Steven R.} and Marcella Marconi and David Mart{\'i}nez-Delgado and Pol Massana and Mu, {Ricardo R.{\~N}oz} and Florian Niederhofer and No{\"e}l, {Noelia E.D.} and Oliveira, {Joana M.} and Knut Olsen and Pennock, {Clara M.} and V. Ripepi and Smitha Subramanian and Vivas, {A. Katherina}",

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doi = "10.1093/mnras/staa2786",

language = "English (US)",

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T1 - The intrinsic reddening of the Magellanic Clouds as traced by background galaxies - II. The Small Magellanic Cloud

AU - Bell, Cameron P.M.

AU - Cioni, Maria Rosa L.

AU - Wright, A. H.

AU - Rubele, Stefano

AU - Nidever, David L.

AU - Tatton, Ben L.

AU - Van Loon, Jacco Th

AU - Zaritsky, Dennis

AU - Choi, Yumi

AU - Choudhury, Samyaday

AU - Clementini, Gisella

AU - De Grijs, Richard

AU - Ivanov, Valentin D.

AU - Majewski, Steven R.

AU - Marconi, Marcella

AU - Martínez-Delgado, David

AU - Massana, Pol

AU - Mu, Ricardo R.Ñoz

AU - Niederhofer, Florian

AU - Noël, Noelia E.D.

AU - Oliveira, Joana M.

AU - Olsen, Knut

AU - Pennock, Clara M.

AU - Ripepi, V.

AU - Subramanian, Smitha

AU - Vivas, A. Katherina

PY - 2020/11/1

Y1 - 2020/11/1

N2 - 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) ≃ 0.3mag]. 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.

AB - 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) ≃ 0.3mag]. 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.

KW - Dust, extinction

KW - Galaxies: ISM-Magellanic Clouds

KW - Galaxies: photometry

KW - Surveys

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U2 - 10.1093/mnras/staa2786

DO - 10.1093/mnras/staa2786

M3 - Article

AN - SCOPUS:85098538131

SN - 0035-8711

VL - 499

SP - 993

EP - 1004

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

The intrinsic reddening of the Magellanic Clouds as traced by background galaxies - II. The Small Magellanic Cloud

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Keywords

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