REVIEW 7 cited by
The DECam MAGIC Survey: A Wide-field Photometric Metallicity Study of the Sculptor Dwarf Spheroidal Galaxy
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
abstract
The metallicity distribution function and internal chemical variations of a galaxy are fundamental to understand its formation and assembly history. In this work, we analyze photometric metallicities for 3883 stars over seven half-light radii ($\rm r_h$) in the Sculptor dwarf spheroidal (Scl dSph) galaxy, using new narrow-band imaging data from the Mapping the Ancient Galaxy in CaHK (MAGIC) survey conducted with the Dark Energy Camera (DECam) at the 4-m Blanco Telescope. This work demonstrates the scientific potential of MAGIC using the Scl dSph galaxy, one of the most well-studied satellites of the Milky Way. Our sample ranges from $\rm [Fe/H] \approx - 4.0$ to $\rm [Fe/H] \approx - 0.6$, includes six new extremely metal-poor candidates ($\rm [Fe/H] \leq -3.0$), and is almost three times larger than the largest spectroscopic metallicity dataset in the Scl dSph. Our spatially unbiased sample of metallicities provides a more accurate representation of the metallicity distribution function, revealing a more metal-rich peak than observed in the most recent spectroscopic sample. It also reveals a break in the metallicity gradient, with a strong change in the slope: from $-3.26 \pm 0.18 \rm \ dex/deg$ for stars inside $\sim 1\ \rm r_h$ to $-0.55 \pm 0.26 \rm \ dex/deg$ for the outer part of the Scl dSph. Our study demonstrates that combining photometric metallicity analysis with the wide field of view of DECam offers an efficient and unbiased approach for studying the stellar populations of dwarf galaxies in the Local Group.
Forward citations
Cited by 7 Pith papers
-
The DECam MAGIC Survey: Uncovering the Tidal Tails of the Crater II Dwarf Galaxy
Calcium-strength photometry identifies 37 candidate stars in Crater II's tidal tails, implying the dwarf has lost at least 25% of its initial stellar mass.
-
Discovery of an $\rm[Fe/H] \sim -4.8$ Star in $Gaia$ XP Spectra
GDR3_526285 is a red giant with [Fe/H] = -4.82 +/- 0.25, one of the most iron-poor stars known, whose carbon upper limit leaves open a rare non-carbon-enhanced origin.
-
Estimating Fe and Mg Abundances in the Milky Way Dwarf Galaxies Using Subaru/HSC and DEIMOS
Photometry from three HSC filters, calibrated with Keck/DEIMOS spectra, maps iron and magnesium abundances of 6,713 giant stars in four dwarf galaxies and reveals radial abundance gradients.
-
Spectroscopic Analysis of Pictor II: a very low metallicity ultra-faint dwarf galaxy bound to the Large Magellanic Cloud
Pictor II is spectroscopically confirmed as an extremely metal-poor, dark matter-dominated ultra-faint dwarf galaxy that is very likely bound to the Large Magellanic Cloud.
-
Near-Infrared Observations of BD+44 493 with IGRINS-2
IGRINS-2 spectra detect the first H-band atomic carbon line in an ultra metal-poor star, with C, Mg, Si, and Ca abundances matching earlier optical and ultraviolet estimates.
-
Recent Advances in Understanding R-Process Nucleosynthesis in Metal-Poor Stars and Stellar Systems
A review of r-process nucleosynthesis evidence in metal-poor stars that confirms neutron star mergers as one production site but leaves open whether additional, earlier-acting sites are needed.
- The DECam MAGIC Survey: Spectroscopic Follow-up of the Most Metal-Poor Stars in the Distant Milky Way Halo
Discussion (0). Continue with ORCID to comment.