Presentation Title

Three-Dimensional Kinematic Structure of the ONC and the Velocity Dispersions of Low-mass Objects

Faculty Mentor

Quinn Konopacky

Start Date

18-11-2017 11:00 AM

End Date

18-11-2017 11:15 AM

Location

9-239

Session

Physical Sciences 4

Type of Presentation

Oral Talk

Subject Area

physical_mathematical_sciences

Abstract

I will present my results on cataloging the kinematic profile of 16 Very Low Mass objects(VLMOs) in Orion Nebular Cluster(ONC) from a low-mass object spectroscopic survey taken by NIRSPAO+LGS on Keck II. The radial velocities of the objects are derived from fitting the target spectrum with models with certain effective temperature and surface gravity, and the appropriate temperate and surface gravity are obtained through fitting the spectrum with a PHOENIX atmosphere model grid. The temperatures and surface gravities also provide more stringent mass estimates for the sources than photometry alone.I aim to derive the velocity dispersion as a function of mass and compare the velocity dispersions and anisotropies of low-mass objects in ONC to those suggested by some star formation theories. Specifically, I will examine if the VLMOs exhibit higher velocity dispersions as predicted by recent simulations of VLMOs forming along dense filaments of gas falling into the forming cluster.

Summary of research results to be presented

I will present the measured radial velocities (RVs) of the targets, attempts on deriving the velocity dispersion as a function of mass, and the preliminary results of comparisons between measured velocity dispersions and recent simulations.

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Nov 18th, 11:00 AM Nov 18th, 11:15 AM

Three-Dimensional Kinematic Structure of the ONC and the Velocity Dispersions of Low-mass Objects

9-239

I will present my results on cataloging the kinematic profile of 16 Very Low Mass objects(VLMOs) in Orion Nebular Cluster(ONC) from a low-mass object spectroscopic survey taken by NIRSPAO+LGS on Keck II. The radial velocities of the objects are derived from fitting the target spectrum with models with certain effective temperature and surface gravity, and the appropriate temperate and surface gravity are obtained through fitting the spectrum with a PHOENIX atmosphere model grid. The temperatures and surface gravities also provide more stringent mass estimates for the sources than photometry alone.I aim to derive the velocity dispersion as a function of mass and compare the velocity dispersions and anisotropies of low-mass objects in ONC to those suggested by some star formation theories. Specifically, I will examine if the VLMOs exhibit higher velocity dispersions as predicted by recent simulations of VLMOs forming along dense filaments of gas falling into the forming cluster.