The Faint Stellar Object SDSS J1257+3419 is a Dark Matter Dominated System
| dc.creator | Kamaya, Hideyuki | |
| dc.date | 2007-09-04 | |
| dc.date | 2007-11-07 | |
| dc.date.accessioned | 2026-07-07T08:40:55Z | |
| dc.date.available | 2026-07-07T08:40:55Z | |
| dc.description | A recent study has revealed SDSS J1257+3419 is either a faint and small dwarf galaxy or a faint and widely extended globular cluster. In this Letter, the author suggests this stellar system is a dwarf spheroidal (dSph). Adopting an observational relation between binding energy and mass of old stellar systems, we derive a relation between mass and size of dSphs by assuming that they are dark matter dominated and virialized objects. Letting half-light radius represent size of SDSS J1257+3419, we find that its mass is $\sim 7\times 10^6$ solar mass. This indicates mass-to-light ratio ($M/L$) of SDSS J1257+3419 is about 1000 in the solar unit. This large $M/L$ is expected from a Mateo plot of dSphs. Thus, we insist SDSS J1257+3419 is a dSph. | |
| dc.description | resubmitted | |
| dc.identifier | https://arxiv.org/abs/0709.0327 | |
| dc.identifier | http://arxiv.org/abs/0709.0327 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/141516 | |
| dc.subject | Astrophysics | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.subject | High Energy Physics - Theory | |
| dc.subject | Nuclear Theory | |
| dc.title | The Faint Stellar Object SDSS J1257+3419 is a Dark Matter Dominated System | |
| dc.type | text |