SIMBAD references

2014ApJ...793L...7S - Astrophys. J., 793, L7 (2014/September-3)

Discovery of a new faint dwarf galaxy associated with NGC 253.

SAND D.J., CRNOJEVIC D., STRADER J., TOLOBA E., SIMON J.D., CALDWELL N., GUHATHAKURTA P., McLEOD B. and SETH A.C.

Abstract (from CDS):

We report the discovery of a new faint dwarf galaxy, which we dub Scl-MM-Dw1, at a projected distance of ∼65 kpc from the spiral galaxy NGC 253. The discovery results from the Panoramic Imaging Survey of Centaurus and Sculptor (PISCeS), a program with the Magellan/Megacam imager to study faint substructure in resolved stellar light around massive galaxies outside of the Local Group. We measure a tip of the red giant branch distance to Scl-MM-Dw1 of D = 3.9±0.5 Mpc, consistent with that of NGC 253, making their association likely. The new dwarf's stellar population is complex, with an old, metal-poor red giant branch ( ≳ 10 Gyr, [Fe/H] ∼ -2), and an asymptotic giant branch with an age of ∼500 Myr. Scl-MM-Dw1 has a half-light radius of rh= 340±50 pc and an absolute magnitude of MV= -10.3±0.6 mag, comparable to the Milky Way's satellites at the same luminosity. Once complete, our imaging survey of NGC 253 and other nearby massive galaxies will provide a census of faint substructure in halos beyond the Local Group, both to put our own environment into context and to confront models of hierarchical structure formation.

Abstract Copyright:

Journal keyword(s): dark matter - galaxies: dwarf

Nomenclature: [SCS2014] SCl-MM-DwN (No. Dw1).

Simbad objects: 12

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2019.10.15-00:14:13

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