SIMBAD references

2004AJ....127..832C - Astron. J., 127, 832-839 (2004/February-0)

Shell structure in the Fornax dwarf spheroidal galaxy.

COLEMAN M., DA COSTA G.S., BLAND-HAWTHORN J., MARTINEZ-DELGADO D., FREEMAN K.C. and MALIN D.

Abstract (from CDS):

We present initial results from a wide-field photometric survey of the Fornax dwarf spheroidal (dSph) galaxy. The focus here is on a small overdensity of stars located approximately 17' (670 pc in projection) from the center of Fornax. Based on imaging data in both V and I bands down to V~21, the dimensions of the feature are ∼1'.7x3'.2 (68x128 pc) with an average surface brightness of 25.8 mag/arcsec in V. A follow-up analysis using the deep B- and R-band data obtained by Stetson, Hesser, & Smecker-Hane indicates that the overdensity is apparently dominated by a relatively young stellar population with an age of ~2 Gyr, though the current data do not rule out the presence of older stars. Our preferred interpretation is that the overdensity represents shell structure in the Fornax dSph galaxy, a phenomenon previously unseen in dwarf galaxies. The shell may be the remnant of a merger with Fornax of a smaller, gas-rich system that occurred approximately 2 Gyr ago. The comparatively recent star formation seen in some dSph and dE galaxies may then also be the result of infall of small relatively gas-rich systems.

Abstract Copyright:

Journal keyword(s): Galaxies: Dwarf - Galaxies: Individual: Name: Fornax - Galaxies: Interactions - Galaxies: Photometry - Galaxies: Stellar Content - Galaxy: Halo - Galaxies: Local Group

Simbad objects: 8

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