All-sky Kinematics and Chemistry of Monoceros Stellar Overdensity

Borbolato, Lais; Perottoni, Hélio D.; Rossi, Silvia; Limberg, Guilherme; Pérez-Villegas, Angeles; Anders, Friedrich; Antoja, Teresa; Laporte, Chervin F. P.; Rocha-Pinto, Helio J.; Santucci, Rafael M.

doi:10.3847/1538-4357/ad02fb

Cited by 2 publications

(1 citation statement)

References 98 publications

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“…To further investigate if ACS and MNC share the same star formation history and thus the same chemical patterns as the Galactic thin disk, we definitely need to explore more elements. Toward this, Chou et al (2010) measured the Ti, Y, and La abundances of MNC and argued their chemical trajectories agree with the trends outlined by Galactic stars, and a recent work showed similar results in Mg, Al and Ni abundances (Borbolato et al 2024). Our work gives a more complete picture to this investigation: we have confirmed that ACS and MNC are dynamically consistent with the Galactic thin disk.…”

Section: Chemodynamical Signaturessupporting

confidence: 80%

Chemodynamical Nature of the Anticenter Stream and Monoceros Ring

Qiao,

Tang,

Lian

et al. 2024

ApJ

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In the epoch of deep photometric surveys, a large number of substructures—e.g., overdensities and streams—have been identified. With the help of astrometry and spectroscopy, the community has revealed a complex picture of our Milky Way (MW) after investigating their origins. The off-plane substructures the Anticenter Stream (ACS) and Monoceros Ring (MNC), once considered as dissolving dwarf galaxies, were later found to share similar kinematics and metallicity with the Galactic outer thin disk. In this work, we aim to chemically tag ACS and MNC with high-accuracy abundances from the APOGEE survey. By extrapolating chemical abundance trends in the outer thin-disk region (10 < R GC < 18 kpc, 0 < ∣Z GC∣ < 3 kpc), we found that ACS and MNC stars show consistent chemical abundances as the extrapolating values for 12 elements, including C, N, O, Mg, Al, Si, K, Ca, Cr, Mn, Co, and Ni. The similar chemical patterns indicate that ACS and MNC have a similar star formation history as the MW outer thin disk, while we also excluded their dwarf galaxy association, as they are distinctive in multiple chemical spaces. The ages of ACS and MNC stars are consistent with the time of the first Sagittarius dSph passage, indicating their possible connection.

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Section: Chemodynamical Signaturessupporting

confidence: 80%

Chemodynamical Nature of the Anticenter Stream and Monoceros Ring

Qiao,

Tang,

Lian

et al. 2024

ApJ

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Mapping the anisotropic Galactic stellar halo with blue horizontal branch stars

Amarante,

Koposov,

Laporte

2024

A&A

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We used Legacy Survey photometric data to probe the stellar halo in multiple directions of the sky using a probabilistic methodology to identify blue horizontal branch (BHB) stars. The measured average radial density profile follows a double power law in the range $ 5 < r_ gc kpc < 120$, with a density break at $r_ gc kpc. This description, however, falls short, depending on the chosen line of sight, with some regions showing no signature of a break in the profile and a wide range of density slopes, such as an outer slope $-5.5 out -4$, pointing towards a highly anisotropic stellar halo. This explains, in part, the wide range of density profiles reported in the literature owing to different tracers and sky coverage. Using our detailed 3D stellar halo density map, we quantified the shape of the Pisces overdensity associated with the transient wake response of the Galaxy's (dark) halo to the Large Magellanic Cloud (LMC). Measured in the LMC’s coordinate system, Pisces stands above the background, is 60 degrees long and 25 degrees wide, and is aligned with the LMC’s orbit. This would correspond to a wake width of $ 32$ kpc at $ 70$ kpc. We do not find a statistically significant signature of the collective response in density as previously reported in the literature measured with K giant stars, despite our larger numbers. We release the catalogue constructed in this study with 95,446 possible BHB stars and their BHB probability.

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All-sky Kinematics and Chemistry of Monoceros Stellar Overdensity

Cited by 2 publications

References 98 publications

Chemodynamical Nature of the Anticenter Stream and Monoceros Ring

Chemodynamical Nature of the Anticenter Stream and Monoceros Ring

Mapping the anisotropic Galactic stellar halo with blue horizontal branch stars

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