SMHASH: A new mid-infrared RR Lyrae distance determination for the Local Group dwarf spheroidal galaxy Sculptor

Abstract

We present a new distance estimation for the Milky Way dwarf spheroidal satellite Sculptor obtained from multi-epoch mid-infrared observations of RR Lyrae stars. The 3.6 μm observations have been acquired with the Infrared Array Camera on board the Spitzer Space Telescope as part of the SMHASH Program. Mid-infrared light curves for 42 RRL were obtained, from which we measured Sculptor's distance modulus to be μ = 19.60 $\pm$ 0.02 (statistical) $\pm$ 0.04 (photometric) mag (with ${\sigma }_{sys}=$ = 0.09 mag), using the 3.6 μm empirical period-luminosity relations derived from the Galactic globular cluster M4, or μ = 19.57 $\pm$ 0.02 (statistical) $\pm$ 0.04 (photometric) mag (with ${\sigma }_{sys}=$ = 0.11 mag) using empirical relations in the same passband recently derived from the Large Magellanic Cloud globular cluster Reticulum. Both these measurements are in good agreement with values presented in previous works with Sculptor RR Lyrae stars in optical bands, and are also consistent with recent near-infrared RR Lyrae results. Best agreement with the literature is found for the latter modulus which is equivalent to a distance of d = 82 $\pm$ 1 (statistical) $\pm$ 2 (photometric) kpc (with ${\sigma }_{sys}=$ = 4 kpc). Finally, using a subsample of RR Lyrae stars with spectroscopic metallicities, we demonstrate that these distance estimates are not affected by metallicity effects.

arXiv comment24 pages, 11 figures. Accepted for publication in MNRAS

References in corpus (71)

• Gaia Data Release 2. Summary of the contents and survey properties
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The Infrared Array Camera (IRAC) for the Spitzer Space Telescope
• Gaia Data Release 2: The astrometric solution
• The observed properties of dwarf galaxies in and around the Local Group
• Star Formation Histories, Abundances and Kinematics of Dwarf Galaxies in the Local Group
• Tracing Galaxy Formation with Stellar Halos I: Methods
• An eclipsing binary distance to the Large Magellanic Cloud accurate to 2 per cent
• Intrinsic iron spread and a new metallicity scale for Globular Clusters
• Cosmicflows-2: The Data
• Abundances for Globular Cluster Giants: I. Homogeneous Metallicities for 24 Clusters
• Gaia Data Release 2: Catalogue validation
• Gaia Data Release 1: Astrometry - one billion positions, two million proper motions and parallaxes
• Numerical Methods of Star Formation History Measurement and Applications to Seven Dwarf Spheroidals
• The Star Formation Histories of Local Group Dwarf Galaxies I. Hubble Space Telescope / Wide Field Planetary Camera 2 Observations
• Carnegie Hubble Program: A Mid-Infrared Calibration of the Hubble Constant
• Gaia Data Release 1: Catalogue validation
• Two distinct ancient components in the Sculptor Dwarf Spheroidal Galaxy: First Results from DART
• Tip of the Red Giant Branch Distances. II. Zero-Point Calibration
• Horizontal Branch Stars: The Interplay between Observations and Theory, and Insights into the Formation of the Galaxy
• The kinematic status and mass content of the Sculptor dwarf spheroidal galaxy
• Hierarchical galaxy formation and substructure in the Galaxy's stellar halo
• The RR Lyrae Period-Luminosity Relation. I. Theoretical Calibration
• Probing the Outer Galactic halo with RR Lyrae from the Catalina Surveys
• On a new theoretical framework for RR Lyrae stars I: the metallicity dependence
• 'Sculptor'-ing the Galaxy? The Chemical Compositions of Red Giants in the Sculptor Dwarf Spheroidal Galaxy
• A pulsational approach to near infrared and visual magnitudes of RR Lyrae stars
• Distance Scale Zero-Points from Galactic RR Lyrae Star Parallaxes
• Satellites of Simulated Galaxies: survival, merging, and their relation to the dark and stellar halos
• The Araucaria Project. The Distance to the Sculptor dwarf spheroidal galaxy from infrared photometry of RR Lyrae stars
• Variable stars in the newly discovered Milky Way satellite in Bootes
• Gaia Data Release 1. Testing the parallaxes with local Cepheids and RR Lyrae stars
• On the distance of the globular cluster M4 (NGC 6121) using RR Lyrae stars: I. optical and near-infrared Period-Luminosity and Period-Wesenheit relations
• Theoretical insights into the RR Lyrae K-band Period-Luminosity relation
• The Carnegie Hubble Program: The Leavitt Law at 3.6 and 4.5 micron in the Milky Way
• Stellar streams around the Magellanic Clouds
• Comparison of Distances from RR Lyrae Stars, the Tip of the Red-Giant Branch and Classical Cepheids
• The VMC survey - XXVI. Structure of the Small Magellanic Cloud from RR Lyrae stars
• Standard Galactic Field RR Lyrae. I. Optical to Mid-infrared Phased Photometry
• The Globular Cluster Omega Centauri and the Oosterhoff Dichotomy
• CU Comae: a new field double-mode RR Lyrae, the most metal poor discovered to date
• New near-infrared period-luminosity-metallicity relations for RR Lyrae stars and the outlook for Gaia
• An Internal Second Parameter Problem in the Sculptor Dwarf Spheroidal Galaxy
• The distance to the LMC cluster Reticulum from the K-band Period-Luminosity-Metallicity relation of RR Lyrae stars
• RR Lyrae Stars in the Bootes dSph
• Variable Stars in Local Group Galaxies. I: Tracing the Early Chemical Enrichment and Radial Gradients in the Sculptor dSph with RR Lyrae Stars
• Variable stars in Local Group Galaxies - II. Sculptor dSph
• On a new theoretical framework for RR Lyrae stars II: Mid--Infrared Period--Luminosity--Metallicity Relations
• Deep Wide-Field Imaging down to the oldest Main Sequence Turnoffs in the Sculptor dwarf spheroidal galaxy
• New Metallicities of RR Lyrae Stars in omega Centauri: Evidence for a Non He-Enhanced Metal-Intermediate Population
• Variable stars in the ultra-faint dwarf spheroidal galaxy Ursa Major I
• Mapping the outer bulge with RRab stars from the VVV Survey
• Distance to Galactic globulars using the near-infrared magnitudes of RR Lyrae stars: IV. The case of M5 (NGC5904)
• Stacking the Invisibles: A Guided Search for Low-Luminosity Milky Way Satellites
• A Preliminary Calibration of the RR Lyrae Period-Luminosity Relation at Mid-Infrared Wavelengths: WISE Data
• Probing the early chemical evolution of the Sculptor dSph with purely old stellar tracers
• The metal abundance distribution of the oldest stellar component in the Sculptor dwarf spheroidal galaxy
• Tracing the tidal streams of the Sagittarius dSph, and halo Milky Way features, with carbon-rich long-period variables
• On the distance of the globular cluster M4 (NGC 6121) using RR Lyrae stars: II. Mid-infrared period-luminosity relations
• The ISLAnds Project III: Variable Stars in Six Andromeda Dwarf Spheroidal Galaxies
• Asymptotic Giant Branch Stars in the Sculptor Dwarf Spheroidal Galaxy
• Charting Unexplored Dwarf Galaxy Territory With RR Lyrae
• On the double-mode RR Lyrae variables of the Sculptor dwarf galaxy
• Mid-infrared PL relations for Globular Cluster RR Lyrae
• Mid-Infrared Period--Luminosity Relations of RR Lyrae Stars Derived from the AllWISE Data Release
• The Araucaria Project. Infrared Tip of the Red Giant Branch Distances to Five Dwarf Galaxies in the Local Group
• A Mid-infrared Study of RR Lyrae Stars with the WISE All-Sky Data Release
• The Horizontal Branch of the Sculptor Dwarf galaxy
• The Carnegie RR Lyrae Program: Mid-infrared Period-Luminosity relations of RR Lyrae stars in Reticulum
• SMHASH: Anatomy of the Orphan Stream using RR Lyrae stars
• Complexity on dwarf galaxies scale: A bimodal distribution function in Sculptor

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• The effect of tides on the Sculptor dwarf spheroidal galaxy
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• RR Lyrae mid-infrared Period-Luminosity-Metallicity and Period-Wesenheit-Metallicity relations based on Gaia DR3 parallaxes
• Distances to Local Group Galaxies via Population II, Stellar Distance Indicators I: The Sculptor Dwarf Spheroidal
• Decoding RR Lyrae light curves with deep learning for accurate absolute magnitude estimation