A Deeper Look at DES Dwarf Galaxy Candidates: Grus i and Indus ii

Cantu, S and Pace, A and Desai, S. and et al, . (2021) A Deeper Look at DES Dwarf Galaxy Candidates: Grus i and Indus ii. Astrophysical Journal, 916 (2). p. 81. ISSN 1538-4357

Full text not available from this repository. (Request a copy)


We present deep g- and r-band Magellan/Megacam photometry of two dwarf galaxy candidates discovered in the Dark Energy Survey (DES), Grus i and Indus ii (DES J2038–4609). For the case of Grus i, we resolved the main sequence turn-off (MSTO) and ∼2 mags below it. The MSTO can be seen at g0 ∼ 24 with a photometric uncertainty of 0.03 mag. We show Grus i to be consistent with an old, metal-poor (∼13.3 Gyr, [Fe/H] ∼ −1.9) dwarf galaxy. We derive updated distance and structural parameters for Grus i using this deep, uniform, wide-field data set. We find an azimuthally-averaged halflight radius more than two times larger (∼151+21−31 pc; ∼$4\buildrel{\,\prime}\over{.} {16}_{-0.74}^{+0.54}$) and an absolute V-band magnitude ∼−4.1 that is ∼1 magnitude brighter than previous studies. We obtain updated distance, ellipticity, and centroid parameters that are in agreement with other studies within uncertainties. Although our photometry of Indus ii is ∼2–3 magnitudes deeper than the DES Y1 public release, we find no coherent stellar population at its reported location. The original detection was located in an incomplete region of sky in the DES Y2Q1 data set and was flagged due to potential blue horizontal branch member stars. The best-fit isochrone parameters are physically inconsistent with both dwarf galaxies and globular clusters. We conclude that Indus ii is likely a false positive, flagged due to a chance alignment of stars along the line of sight.

[error in script]
IITH Creators:
IITH CreatorsORCiD
Desai, Shantanuhttp://orcid.org/0000-0002-0466-3288
Item Type: Article
Subjects: Physics
Divisions: Department of Physics
Depositing User: Mrs Haseena VKKM
Date Deposited: 03 Nov 2021 05:58
Last Modified: 18 Feb 2022 05:55
URI: http://raiith.iith.ac.in/id/eprint/8868
Publisher URL: https://iopscience.iop.org/article/10.3847/1538-43...
OA policy: https://v2.sherpa.ac.uk/id/publication/6401?templa...
Related URLs:

Actions (login required)

View Item View Item
Statistics for RAIITH ePrint 8868 Statistics for this ePrint Item