التفاصيل البيبلوغرافية
| العنوان: |
Tracing the stellar component of low surface brightness Milky Way dwarf galaxies to their outskirts |
| المؤلفون: |
Cicuéndez, L, Battaglia, G, Irwin, M, Bermejo-Climent, JR, McMonigal, B, Bate, NF, Lewis, GF, Conn, AR, De Boer, TJL, Gallart, C, Guglielmo, M, Ibata, R, McConnachie, A, Tolstoy, E, Fernando, N |
| بيانات النشر: |
EDP Sciences
//dx.doi.org/10.1051/0004-6361/201731450
Astronomy and Astrophysics |
| سنة النشر: |
2018 |
| المجموعة: |
Apollo - University of Cambridge Repository |
| مصطلحات موضوعية: |
galaxies: individual: Sextans dSph, galaxies: dwarf, Local Group, galaxies: structure, galaxies: statistics, dark matter |
| الوصف: |
Aims. We present results from deep and very spatially extended CTIO/DECam g and r photometry (reaching out to ~2 mag below the oldest main-sequence turn-off and covering ~20 deg2) around the Sextans dwarf spheroidal galaxy. We aim to use this dataset to study the structural properties of Sextans overall stellar population and its member stars in different evolutionary phases, as well as to search for possible signs of tidal disturbance from the Milky Way, which would indicate departure from dynamical equilibrium. Methods. We performed the most accurate and quantitative structural analysis to-date of Sextans’ stellar components by applying Bayesian Monte Carlo Markov chain methods to the individual stars’ positions. Surface density maps are built by statistically decontaminating the sample through a matched filter analysis of the colour-magnitude diagram, and then analysed for departures from axisymmetry. Results. Sextans is found to be significantly less spatially extended and more centrally concentrated than early studies suggested. No statistically significant distortions or signs of tidal disturbances were found down to a surface brightness limit of ~31.8 mag/arcsec2 in V-band. We identify an overdensity in the central regions that may correspond to previously reported kinematic substructure(s). In agreement with previous findings, old and metal-poor stars such as Blue Horizontal Branch stars cover a much larger area than stars in other evolutionary phases, and bright Blue Stragglers (BSs) are less spatially extended than faint ones. However, the different spatial distribution of bright and faint BSs appears consistent with the general age and ... |
| نوع الوثيقة: |
article in journal/newspaper |
| وصف الملف: |
application/pdf |
| اللغة: |
English |
| العلاقة: |
https://www.repository.cam.ac.uk/handle/1810/274819Test |
| DOI: |
10.17863/CAM.21967 |
| الإتاحة: |
https://doi.org/10.17863/CAM.21967Test
https://www.repository.cam.ac.uk/handle/1810/274819Test |
| رقم الانضمام: |
edsbas.43F3F9D6 |
| قاعدة البيانات: |
BASE |
