期刊
ASTROPHYSICAL JOURNAL
卷 748, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/748/1/2
关键词
galaxies: elliptical and lenticular, cD; galaxies: general; galaxies: kinematics and dynamics
资金
- Science and Technology Facilities Council (STFC)
- Royal Society
- Science and Technology Facilities Council [ST/F00723X/1, ST/J001538/1, ST/H00243X/1, ST/J001465/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien [0909237] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0808099] Funding Source: National Science Foundation
- Division Of Astronomical Sciences [0909237] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [903797] Funding Source: National Science Foundation
- STFC [ST/I004459/1, ST/J001465/1, ST/F00723X/1, ST/I004459/2, ST/J001538/1] Funding Source: UKRI
We estimate the masses of elliptical galaxies out to five effective radii using planetary nebulae and globular clusters as tracers. A sample of 15 elliptical galaxies with a broad variation in mass is compiled from the literature. A distribution function-maximum likelihood analysis is used to estimate the overall potential slope, normalization, and velocity anisotropy of the tracers. We assume power-law profiles for the potential and tracer density and a constant velocity anisotropy. The derived potential power-law indices lie in between the isothermal and Keplerian regime and vary with mass: there is tentative evidence that the less massive galaxies have steeper potential profiles than the more massive galaxies. We use stellar mass-to-light ratios appropriate for either a Chabrier/KTG (Kroupa, Tout& Gilmore) or Salpeter initialmass function to disentangle the stellar and darkmatter components. The fraction of dark matter within five effective radii increases with mass, in agreement with several other studies. We employ simple models to show that a combination of star formation efficiency and baryon extent are able to account for this trend. These models are in good agreement with both our measurements out to five effective radii and recent Sloan Lens ACS Survey measurements within one effective radii when a universal Chabrier/ KTG initial mass function is adopted.
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