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Dive into the research topics where Mark W. Hodges is active.

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Featured researches published by Mark W. Hodges.


The Astrophysical Journal | 2009

Dynamically driven evolution of the interstellar medium in M51

Jin Koda; N. Z. Scoville; Tsuyoshi Sawada; Misty A. La Vigne; Stuart N. Vogel; Ashley E. Potts; John M. Carpenter; Stuartt A. Corder; Melvyn C. H. Wright; Stephen M. White; B. Ashley Zauderer; J. Patience; Anneila I. Sargent; Douglas C.-J. Bock; David Hawkins; Mark W. Hodges; A. J. Kemball; James W. Lamb; R. L. Plambeck; Marc W. Pound; Stephen L. Scott; Peter J. Teuben; David P. Woody

Massive star formation occurs in giant molecular clouds (GMCs); an understanding of the evolution of GMCs is a prerequisite to develop theories of star formation and galaxy evolution. We report the highest-fidelity observations of the grand-design spiral galaxy M51 in carbon monoxide (CO) emission, revealing the evolution of GMCs vis-a-vis the large-scale galactic structure and dynamics. The most massive GMCs (giant molecular associations (GMAs)) are first assembled and then broken up as the gas flow through the spiral arms. The GMAs and their H_2 molecules are not fully dissociated into atomic gas as predicted in stellar feedback scenarios, but are fragmented into smaller GMCs upon leaving the spiral arms. The remnants of GMAs are detected as the chains of GMCs that emerge from the spiral arms into interarm regions. The kinematic shear within the spiral arms is sufficient to unbind the GMAs against self-gravity. We conclude that the evolution of GMCs is driven by large-scale galactic dynamics—their coagulation into GMAs is due to spiral arm streaming motions upon entering the arms, followed by fragmentation due to shear as they leave the arms on the downstream side. In M51, the majority of the gas remains molecular from arm entry through the interarm region and into the next spiral arm passage.


The Astrophysical Journal | 1993

VLBI astrometric identification of the radio emitting region in Algol and determination of the orientation of the close binary

Jean-Francois Lestrade; Rob Phillips; Mark W. Hodges; R. A. Preston

A minute displacement of the radio source in Algol was measured by VLBI during two consecutive orbital revolutions of the close binary. The magnitude of the displacement unambiguously indicates that the less massive star of the close binary, a K subgiant, is the star responsible for the nonthermal radio emission of the system. This is consistent with the idea that the radio emission in Algol is related to the strong magnetic activity of the subgiant. The orientation and sense of the displacement on the sky that are directly deduced from our astrometric VLBI observations imply: (1) that the orbital plane of the close binary is at P.A. = +52 deg +/- 5 deg; and (2) that the sense of circulation of the close binary is clockwise, as seen on the sky. Thus, the long-period and close binary orbital motions are almost orthogonal and counterrevolving and this is relevant for evolution and dynamical studies.


The Astrophysical Journal | 1990

223 GHz VLBI observations of 3C 273

S. Padin; David P. Woody; Mark W. Hodges; Alan E. E. Rogers; D.T. Emerson

In the first 1.4 mm wavelength VLBI test observations, fringes have been detected on the active nucleus of 3C 273 on a baseline from Owens Valley Radio Observatory to Kitt Peak. The observations are consistent with a source whose angular size is smaller than 0.5 mas. 5 refs.


The Astrophysical Journal | 2008

Molecular Gas in the z = 1.2 Ultraluminous Merger GOODS J123634.53+621241.3

David T. Frayer; Jin Koda; Alexandra Pope; Minh T. Huynh; Ranga-Ram Chary; Douglas Scott; Mark Dickinson; Douglas C.-J. Bock; John M. Carpenter; David Hawkins; Mark W. Hodges; James W. Lamb; R. L. Plambeck; Marc W. Pound; Stephen L. Scott; Nicholas Z. Scoville; David P. Woody


The Astrophysical Journal | 1985

The structure of three compact double radio sources at 5 GHz

R. L. Mutel; Mark W. Hodges; Rob Phillips


The Astrophysical Journal | 2009

A RESOLVED RING OF DEBRIS DUST AROUND THE SOLAR ANALOG HD 107146

Stuartt A. Corder; John M. Carpenter; Anneila I. Sargent; B. Ashley Zauderer; Melvyn C. H. Wright; Stephen M. White; David P. Woody; Peter J. Teuben; Stephen L. Scott; Marc W. Pound; R. L. Plambeck; James W. Lamb; Jin Koda; Mark W. Hodges; David Hawkins; Douglas C.-J. Bock


Publications of the Astronomical Society of Japan | 1996

Global 3- and 7-mm VLBI Observations of OJ 287

Claudio E. Tateyama; Makoto Inoue; T. P. Krichbaum; L. B. Baath; Seiji Kameno; Alan E. E. Rogers; Antonio Alberdi; Don Backer; N. Bartel; R. S. Booth; Bernard F. Burke; John E. Carlstrom; Vivek Dhawan; Robert Laurence Dickman; Darrel T. Emerson; Hisashi Hirabayashi; Mark W. Hodges; D. A. Graham; K. J. Johnston; Hideyuki Kobayashi; A. J. Kus; S. Padin; R. L. Plambeck; C. Read Predmore; A. Quirrenbach; C. R. Lawrence; James W. Lamb; J. M. Marcaide; Masak Morimoto; B. O. Ronnang


The Astrophysical Journal | 2009

DENSE, PARSEC-SCALE CLUMPS NEAR THE GREAT ANNIHILATOR

Edmund J. Hodges-Kluck; Marc W. Pound; Andrew I. Harris; James W. Lamb; Mark W. Hodges


Astronomy and Astrophysics | 1998

50 μas resolution VLBI images of AGN’s at λ3 mm

Fredrik T. Rantakyrö; Lars B. Bååth; Don Backer; R. S. Booth; John E. Carlstrom; D.T. Emerson; M. Grewing; Hisashi Hirabayashi; Mark W. Hodges; Makoto Inoue; Hideyuki Kobayashi; T. P. Krichbaum; A. J. Kus; J.M. Moran; M. Morimoto; S. Padin; R. L. Plambeck; R. Predmore; Alan E. E. Rogers; C.J. Schalinski; A. Witzel; David P. Woody; Melvyn C. H. Wright; A. Zensus


Astronomy and Astrophysics | 1993

A 100 GHz map of 3C 446

M. S. Lerner; L. B. Baath; Makoto Inoue; S. Padin; Alan E. E. Rogers; Melvyn C. H. Wright; A. Zensus; Donald C. Backer; R. S. Booth; John E. Carlstrom; D. T. Emerson; Hisashi Hirabayashi; Mark W. Hodges; P. Jewell; Hideyuki Kobayashi; A. J. Kus; James M. Moran; M. Morimoto; R. L. Plambeck; F. T. Rantakyrö; David P. Woody

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David P. Woody

California Institute of Technology

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R. L. Plambeck

University of California

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Rob Phillips

California Institute of Technology

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James W. Lamb

California Institute of Technology

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Alan E. E. Rogers

Massachusetts Institute of Technology

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S. Padin

California Institute of Technology

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R. S. Booth

Chalmers University of Technology

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