The VMC survey: XXX. Stellar proper motions in the central parts of the Small Magellanic Cloud

F. Niederhofer, M. R.L. Cioni, S. Rubele, T. Schmidt, K. Bekki, R. De Grijs, J. Emerson, V. D. Ivanov, M. Marconi, J. M. Oliveira, M. G. Petr-Gotzens, V. Ripepi, J. T. Van Loon, S. Zaggia

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We present the first spatially resolved map of stellar proper motions within the central (~3.1 × 2.4 kpc) regions of the Small Magellanic Cloud (SMC). The data used for this study encompasses four tiles from the ongoing near-infrared VISTA survey of the Magellanic Clouds system and covers a total contiguous area on the sky of ~6.81 deg 2 . Proper motions have been calculated independently in two dimensions from the spatial offsets in the K s filter over time baselines between 22 and 27 months. The reflex motions of approximately 33 000 background galaxies are used to calibrate the stellar motions to an absolute scale. The resulting catalog is composed of more than 690 000 stars which have been selected based on their position in the (J - K s , K s ) color-magnitude diagram. For the median absolute proper motion of the SMC, we find (μ α cos(δ), μ δ ) = (1.087 ± 0.192 (sys.) ± 0.003 (stat.), -1.187 ± 0.008 (sys.) ± 0.003 (stat.)) mas yr -1 , consistent with previous studies. Mapping the proper motions as a function of position within the SMC reveals a nonuniform velocity pattern indicative of a tidal feature behind the main body of the SMC and a flow of stars in the south-east moving predominantly along the line-of-sight.

Original languageEnglish
Article numberL8
Number of pages4
JournalAstronomy and Astrophysics
Volume613
DOIs
Publication statusPublished - 1 May 2018

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proper motion
Magellanic clouds
near infrared
diagram
filter
stellar motions
stars
reflexes
color-magnitude diagram
tiles
line of sight
catalogs
sky
galaxies
filters

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Niederhofer, F. ; Cioni, M. R.L. ; Rubele, S. ; Schmidt, T. ; Bekki, K. ; De Grijs, R. ; Emerson, J. ; Ivanov, V. D. ; Marconi, M. ; Oliveira, J. M. ; Petr-Gotzens, M. G. ; Ripepi, V. ; Van Loon, J. T. ; Zaggia, S. / The VMC survey : XXX. Stellar proper motions in the central parts of the Small Magellanic Cloud. In: Astronomy and Astrophysics. 2018 ; Vol. 613.
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abstract = "We present the first spatially resolved map of stellar proper motions within the central (~3.1 × 2.4 kpc) regions of the Small Magellanic Cloud (SMC). The data used for this study encompasses four tiles from the ongoing near-infrared VISTA survey of the Magellanic Clouds system and covers a total contiguous area on the sky of ~6.81 deg 2 . Proper motions have been calculated independently in two dimensions from the spatial offsets in the K s filter over time baselines between 22 and 27 months. The reflex motions of approximately 33 000 background galaxies are used to calibrate the stellar motions to an absolute scale. The resulting catalog is composed of more than 690 000 stars which have been selected based on their position in the (J - K s , K s ) color-magnitude diagram. For the median absolute proper motion of the SMC, we find (μ α cos(δ), μ δ ) = (1.087 ± 0.192 (sys.) ± 0.003 (stat.), -1.187 ± 0.008 (sys.) ± 0.003 (stat.)) mas yr -1 , consistent with previous studies. Mapping the proper motions as a function of position within the SMC reveals a nonuniform velocity pattern indicative of a tidal feature behind the main body of the SMC and a flow of stars in the south-east moving predominantly along the line-of-sight.",
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Niederhofer, F, Cioni, MRL, Rubele, S, Schmidt, T, Bekki, K, De Grijs, R, Emerson, J, Ivanov, VD, Marconi, M, Oliveira, JM, Petr-Gotzens, MG, Ripepi, V, Van Loon, JT & Zaggia, S 2018, 'The VMC survey: XXX. Stellar proper motions in the central parts of the Small Magellanic Cloud' Astronomy and Astrophysics, vol. 613, L8. https://doi.org/10.1051/0004-6361/201833144

The VMC survey : XXX. Stellar proper motions in the central parts of the Small Magellanic Cloud. / Niederhofer, F.; Cioni, M. R.L.; Rubele, S.; Schmidt, T.; Bekki, K.; De Grijs, R.; Emerson, J.; Ivanov, V. D.; Marconi, M.; Oliveira, J. M.; Petr-Gotzens, M. G.; Ripepi, V.; Van Loon, J. T.; Zaggia, S.

In: Astronomy and Astrophysics, Vol. 613, L8, 01.05.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The VMC survey

T2 - XXX. Stellar proper motions in the central parts of the Small Magellanic Cloud

AU - Niederhofer, F.

AU - Cioni, M. R.L.

AU - Rubele, S.

AU - Schmidt, T.

AU - Bekki, K.

AU - De Grijs, R.

AU - Emerson, J.

AU - Ivanov, V. D.

AU - Marconi, M.

AU - Oliveira, J. M.

AU - Petr-Gotzens, M. G.

AU - Ripepi, V.

AU - Van Loon, J. T.

AU - Zaggia, S.

PY - 2018/5/1

Y1 - 2018/5/1

N2 - We present the first spatially resolved map of stellar proper motions within the central (~3.1 × 2.4 kpc) regions of the Small Magellanic Cloud (SMC). The data used for this study encompasses four tiles from the ongoing near-infrared VISTA survey of the Magellanic Clouds system and covers a total contiguous area on the sky of ~6.81 deg 2 . Proper motions have been calculated independently in two dimensions from the spatial offsets in the K s filter over time baselines between 22 and 27 months. The reflex motions of approximately 33 000 background galaxies are used to calibrate the stellar motions to an absolute scale. The resulting catalog is composed of more than 690 000 stars which have been selected based on their position in the (J - K s , K s ) color-magnitude diagram. For the median absolute proper motion of the SMC, we find (μ α cos(δ), μ δ ) = (1.087 ± 0.192 (sys.) ± 0.003 (stat.), -1.187 ± 0.008 (sys.) ± 0.003 (stat.)) mas yr -1 , consistent with previous studies. Mapping the proper motions as a function of position within the SMC reveals a nonuniform velocity pattern indicative of a tidal feature behind the main body of the SMC and a flow of stars in the south-east moving predominantly along the line-of-sight.

AB - We present the first spatially resolved map of stellar proper motions within the central (~3.1 × 2.4 kpc) regions of the Small Magellanic Cloud (SMC). The data used for this study encompasses four tiles from the ongoing near-infrared VISTA survey of the Magellanic Clouds system and covers a total contiguous area on the sky of ~6.81 deg 2 . Proper motions have been calculated independently in two dimensions from the spatial offsets in the K s filter over time baselines between 22 and 27 months. The reflex motions of approximately 33 000 background galaxies are used to calibrate the stellar motions to an absolute scale. The resulting catalog is composed of more than 690 000 stars which have been selected based on their position in the (J - K s , K s ) color-magnitude diagram. For the median absolute proper motion of the SMC, we find (μ α cos(δ), μ δ ) = (1.087 ± 0.192 (sys.) ± 0.003 (stat.), -1.187 ± 0.008 (sys.) ± 0.003 (stat.)) mas yr -1 , consistent with previous studies. Mapping the proper motions as a function of position within the SMC reveals a nonuniform velocity pattern indicative of a tidal feature behind the main body of the SMC and a flow of stars in the south-east moving predominantly along the line-of-sight.

KW - Galaxies: individual: SMC

KW - Magellanic Clouds

KW - Proper motions

KW - Stars: kinematics and dynamics

KW - Surveys

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U2 - 10.1051/0004-6361/201833144

DO - 10.1051/0004-6361/201833144

M3 - Article

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JF - ASTRONOMY & ASTROPHYSICS

SN - 0004-6361

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