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The extinction law in the inner 3 × 3 deg 2of the Milky Way and the red clump absolute magnitude in the inner bar-bulge. / Sanders, Jason L.; Smith, Leigh C.; González-Fernández, Carlos; Lucas, Philip; Minniti, Dante.

In: Monthly Notices of the Royal Astronomical Society, Vol. 514, No. 2, 01.08.2022, p. 2407-2424.

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Sanders, Jason L. ; Smith, Leigh C. ; González-Fernández, Carlos ; Lucas, Philip ; Minniti, Dante. / The extinction law in the inner 3 × 3 deg 2of the Milky Way and the red clump absolute magnitude in the inner bar-bulge. In: Monthly Notices of the Royal Astronomical Society. 2022 ; Vol. 514, No. 2. pp. 2407-2424.

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@article{9bc7c2f9aaf141e69f45b154970558fe,
title = "The extinction law in the inner 3 × 3 deg 2of the Milky Way and the red clump absolute magnitude in the inner bar-bulge",
abstract = " The extinction law from 0.9 to 8 microns in the inner 3x3 deg^2 of the Milky Way is measured using data from VISTA Variables in the Via Lactea, GLIMPSE and WISE. Absolute extinction ratios are found by requiring that the observed red clump density peaks at the GRAVITY collaboration distance to the Galactic centre. When combined with selective extinction ratios measured from the bulge giant colour-colour diagrams, we find an extinction law of A_Z:A_Y:A_J:A_H:A_{K_s}:A_{W1}:A_{[3.6]}:A_{[4.5]}:A_{W2}:A_{[5.8]}:A_{[8.0]} =7.19(0.30):5.11(0.20):3.23(0.11):1.77(0.04):1:0.54(0.02):0.46(0.03):0.34(0.03):0.32(0.03):0.24(0.04):0.28(0.03) valid for low extinctions where non-linearities are unimportant. These results imply an extinction law from the Rayleigh Jeans colour excess method (RJCE) of A_{K_s}=0.677(H-[4.5]-0.188). We find little evidence for significant selective extinction ratio variation over the inspected region (around 5%). Assuming the absolute extinction ratios do not vary across the inspected region gives an independent measurement of the absolute K_s magnitude of the red clump at the Galactic Centre of (-1.61 +/- 0.07) mag. This is very similar to the value measured for solar neighbourhood red clump stars giving confidence in the use of red clump stars as standard candles across the Galaxy. As part of our analysis, we inspect the completeness of PSF photometry from the VVV survey using artificial star tests, finding 90% completeness at K_s ~16 (17) in high (low) density regions and good agreement with the number counts with respect to the GALACTICNUCLEUS and DECAPS catalogues over small regions of the survey. ",
keywords = "astro-ph.GA, Stars: distances, Galaxy: bulge, Dust, extinction",
author = "Sanders, {Jason L.} and Smith, {Leigh C.} and Carlos Gonz{\'a}lez-Fern{\'a}ndez and Philip Lucas and Dante Minniti",
note = "{\textcopyright} 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. This is the final published pdf, which was originally published at https://doi.org/10.1093/mnras/stac1367",
year = "2022",
month = aug,
day = "1",
doi = "10.1093/mnras/stac1367",
language = "English",
volume = "514",
pages = "2407--2424",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "2",

}

RIS

TY - JOUR

T1 - The extinction law in the inner 3 × 3 deg 2of the Milky Way and the red clump absolute magnitude in the inner bar-bulge

AU - Sanders, Jason L.

AU - Smith, Leigh C.

AU - González-Fernández, Carlos

AU - Lucas, Philip

AU - Minniti, Dante

N1 - © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. This is the final published pdf, which was originally published at https://doi.org/10.1093/mnras/stac1367

PY - 2022/8/1

Y1 - 2022/8/1

N2 - The extinction law from 0.9 to 8 microns in the inner 3x3 deg^2 of the Milky Way is measured using data from VISTA Variables in the Via Lactea, GLIMPSE and WISE. Absolute extinction ratios are found by requiring that the observed red clump density peaks at the GRAVITY collaboration distance to the Galactic centre. When combined with selective extinction ratios measured from the bulge giant colour-colour diagrams, we find an extinction law of A_Z:A_Y:A_J:A_H:A_{K_s}:A_{W1}:A_{[3.6]}:A_{[4.5]}:A_{W2}:A_{[5.8]}:A_{[8.0]} =7.19(0.30):5.11(0.20):3.23(0.11):1.77(0.04):1:0.54(0.02):0.46(0.03):0.34(0.03):0.32(0.03):0.24(0.04):0.28(0.03) valid for low extinctions where non-linearities are unimportant. These results imply an extinction law from the Rayleigh Jeans colour excess method (RJCE) of A_{K_s}=0.677(H-[4.5]-0.188). We find little evidence for significant selective extinction ratio variation over the inspected region (around 5%). Assuming the absolute extinction ratios do not vary across the inspected region gives an independent measurement of the absolute K_s magnitude of the red clump at the Galactic Centre of (-1.61 +/- 0.07) mag. This is very similar to the value measured for solar neighbourhood red clump stars giving confidence in the use of red clump stars as standard candles across the Galaxy. As part of our analysis, we inspect the completeness of PSF photometry from the VVV survey using artificial star tests, finding 90% completeness at K_s ~16 (17) in high (low) density regions and good agreement with the number counts with respect to the GALACTICNUCLEUS and DECAPS catalogues over small regions of the survey.

AB - The extinction law from 0.9 to 8 microns in the inner 3x3 deg^2 of the Milky Way is measured using data from VISTA Variables in the Via Lactea, GLIMPSE and WISE. Absolute extinction ratios are found by requiring that the observed red clump density peaks at the GRAVITY collaboration distance to the Galactic centre. When combined with selective extinction ratios measured from the bulge giant colour-colour diagrams, we find an extinction law of A_Z:A_Y:A_J:A_H:A_{K_s}:A_{W1}:A_{[3.6]}:A_{[4.5]}:A_{W2}:A_{[5.8]}:A_{[8.0]} =7.19(0.30):5.11(0.20):3.23(0.11):1.77(0.04):1:0.54(0.02):0.46(0.03):0.34(0.03):0.32(0.03):0.24(0.04):0.28(0.03) valid for low extinctions where non-linearities are unimportant. These results imply an extinction law from the Rayleigh Jeans colour excess method (RJCE) of A_{K_s}=0.677(H-[4.5]-0.188). We find little evidence for significant selective extinction ratio variation over the inspected region (around 5%). Assuming the absolute extinction ratios do not vary across the inspected region gives an independent measurement of the absolute K_s magnitude of the red clump at the Galactic Centre of (-1.61 +/- 0.07) mag. This is very similar to the value measured for solar neighbourhood red clump stars giving confidence in the use of red clump stars as standard candles across the Galaxy. As part of our analysis, we inspect the completeness of PSF photometry from the VVV survey using artificial star tests, finding 90% completeness at K_s ~16 (17) in high (low) density regions and good agreement with the number counts with respect to the GALACTICNUCLEUS and DECAPS catalogues over small regions of the survey.

KW - astro-ph.GA

KW - Stars: distances

KW - Galaxy: bulge

KW - Dust, extinction

UR - http://www.scopus.com/inward/record.url?scp=85133695998&partnerID=8YFLogxK

U2 - 10.1093/mnras/stac1367

DO - 10.1093/mnras/stac1367

M3 - Article

VL - 514

SP - 2407

EP - 2424

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 2

ER -