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Dive into the research topics where Tarsh Freeman is active.

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Featured researches published by Tarsh Freeman.


The Astronomical Journal | 1993

The galaxy NGC 4622: long-lasting leading arms and rings via low mass perturbers

Gene G. Byrd; Tarsh Freeman; Sethanne Howard

There are few candidates for leading arm galaxies. Only NGC 4622 is a confirmed case because it has both leading and trailing arms. In simulations, we successfully reproduce NGC 4622s leading arm and outer pair of trailing arms. A small mass companion (0.01 of the galaxys mass) passing close (within one-tenth of the disk radius) seems to produce the best match. This very close passage produces a leading arm in our simulations for both direct and retrograde orbit senses.


The Astronomical Journal | 2006

THE INNER RESONANCE RING OF NGC 3081. II. STAR FORMATION, BAR STRENGTH, DISK SURFACE MASS DENSITY, AND MASS-TO-LIGHT RATIO

Gene G. Byrd; Tarsh Freeman; Ronald J. Buta


The Astronomical Journal | 2004

A Hubble Space Telescope Study of Star Formation in the Inner Resonance Ring of NGC 3081

Ronald J. Buta; Gene G. Byrd; Tarsh Freeman


The Astronomical Journal | 2003

The Ringed Spiral Galaxy NGC 4622. I. Photometry, Kinematics, and the Case for Two Strong Leading Outer Spiral Arms

Ronald J. Buta; Gene G. Byrd; Tarsh Freeman


The Astronomical Journal | 1994

NGC 4378's one-armed spiral pattern: Leading or trailing?

Gene G. Byrd; Tarsh Freeman; Sethanne Howard


Celestial Mechanics and Dynamical Astronomy | 2010

Hoag’s object, remnant of a vanished bar?

Tarsh Freeman; Sethanne Howard; Gene G. Byrd


The Astronomical Journal | 2008

THE RINGED SPIRAL GALAXY NGC4622. II. AN INDEPENDENT DETERMINATION THAT THE TWO OUTER ARMS LEAD

Gene G. Byrd; Tarsh Freeman; Sethanne Howard; Ronald J. Buta


Archive | 2008

Inner resonance ring of NGC 3081, disk surface mass density, and the enhanced disk few-body process

Gene G. Byrd; Tarsh Freeman; Ronald J. Buta


Archive | 2004

Does the Galaxy NGC4622 Have a Pair of Leading Arms

Gene G. Byrd; Tarsh Freeman; Ronald J. Buta


Archive | 2004

Star Formation and the Color-Age Sequence in the Inner Resonance Ring of the Galaxy NGC3081

Tarsh Freeman; Gene G. Byrd; Ronald J. Buta

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Sethanne Howard

Los Alamos National Laboratory

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