| Full text | |
| Author(s): |
Borbolato, Lais
;
Perottoni, Helio D.
;
Rossi, Silvia
;
Limberg, Guilherme
;
Perez-Villegas, Angeles
;
Anders, Friedrich
;
Antoja, Teresa
;
Laporte, Chervin F. P.
;
Rocha-Pinto, Helio J.
;
Santucci, Rafael M.
Total Authors: 10
|
| Document type: | Journal article |
| Source: | ASTROPHYSICAL JOURNAL; v. 960, n. 1, p. 11-pg., 2024-01-01. |
| Abstract | |
We explore the kinematic and chemical properties of the Monoceros stellar overdensity by combining data from the Two Micron All Sky Survey, Wide-field Infrared Survey Explorer, APOGEE, and Gaia. Monoceros is a structure located toward the Galactic anticenter and close to the disk. We have identified that its stars have azimuthal velocity in the range of 200 < v (phi) (km s(-1)) < 250. Combining their kinematics and spatial distribution, we designed a new method to select stars from this overdensity. This method allows us to easily identify the structure in both hemispheres and estimate their distances. Our analysis was supported by comparison with simulated data from the entire sky generated by the Galaxia code. Furthermore, we characterized, for the first time, the Monoceros overdensity in several chemical abundance spaces. Our results confirm its similarity to stars found in the thin disk of the Galaxy and suggest an in situ formation. Furthermore, we demonstrate that the southern and northern regions of Monoceros exhibit indistinguishable chemical compositions. (AU) | |
| FAPESP's process: | 18/21250-9 - Identification of bright ultra-metal-poor stars from Multi-Band photometry and spectroscopic follow-up |
| Grantee: | Hélio Dotto Perottoni |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 20/15245-2 - The multi-object spectrograph (MOSAIC) for the extremely large telescope: spectroscopy of stellar populations in the milky way and external galaxies |
| Grantee: | Beatriz Leonor Silveira Barbuy |
| Support Opportunities: | Special Projects |
| FAPESP's process: | 21/10429-0 - The chemodynamical structure of the ancient galactic halo |
| Grantee: | Guilherme Limberg |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |
| FAPESP's process: | 22/07301-5 - Chemical-abundance patterns of disrupted dwarf galaxies |
| Grantee: | Guilherme Limberg |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate (Direct) |
| FAPESP's process: | 21/09967-8 - Characterization of chemodynamical properties of Monoceros stellar overdensity |
| Grantee: | Lais Borbolato Soares |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |
| FAPESP's process: | 15/50374-0 - Mosaic: the multi-object spectrograph for the ESO Extremely Large Telescope |
| Grantee: | Silvia Cristina Fernandes Rossi |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 22/04079-0 - Characterizing ultra-faint dwarf galaxies with S-PLUS survey |
| Grantee: | Hélio Dotto Perottoni |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |