Age Determination of Six Intermediate-age SMC Star Clusters with HST/ACS (2008)
Glatt, Katharina, Grebel, Eva K., Sabbi, Elena, Gallagher, John S., Nota, Antonella, Sirianni, Marco, ...
We present a photometric analysis of the star clusters Lindsay 1, Kron 3, NGC339, NGC416, Lindsay 38, and NGC419 in the Small Magellanic Cloud (SMC), observed with the Hubble Space Telescope Advanced...
Hubble Space Telescope Imaging Of Super Star Clusters In M82 (2007)
Robert W. O'Connell, John S. Gallagher, Deidre A. Hunter, Wesley N. Colley
We describe high resolution V and I band images obtained with the HST Planetary Camera of the center of the prototype starburst galaxy M82. The deconvolved images reveal a remarkable complex of over...
On the Nature of the NGC 1275 System (2007)
Christopher Conselice John, John S. Gallagher
Sub-arcsecond images, taken in B, R, and H# filters, and area spectroscopy obtained with the WIYN 3.5-m telescope provide the basis for an investigation of the unusual structures in the stellar body...
Deep Optical Imaging of Starbursting "Transition" Dwarf Galaxies (2007)
Dellenbusch, Kate E., Gallagher, John S., Knezek, Patricia M., Noble, Allison G.
A subgroup of dwarf galaxies have characteristics of a possible evolutionary transition between star-forming systems and dwarf ellipticals. These systems host significant starbursts in combination...
The Milky Way's Kiloparsec Scale Wind: A Hybrid Cosmic-Ray and Thermally Driven Outflow (2007)
Everett, John E., Zweibel, Ellen G., Benjamin, Robert A., McCammon, Dan, Rocks, Lindsay, Gallagher, John S., ...
We apply a wind model, driven by combined cosmic-ray and thermal-gas pressure, to the Milky Way, and show that the observed Galactic diffuse soft X-ray emission can be better explained by a wind than...
NGC 3310 and Its Tidal Debris: Remnants of Galaxy Evolution (2006)
Wehner, Elizabeth H., Gallagher, John S., Papaderos, Polichronis, Alvensleben, Uta Fritze-von, Westfall, Kyle B.
NGC 3310 is a local galaxy with an intense, ongoing starburst thought to result from a merger with a companion galaxy. It has several known tidal features in the northwest and southern regions around...
Andersen, David R., Bershady, Matthew A., Sparke, Linda S., Gallagher, John S., Wilcots, Eric M., ...
We present a survey of the photometric and kinematic properties of 39 nearby, nearly face-on disk galaxies. Our approach exploits echelle-resolution integral-field spectroscopy of the H-alpha...
II Zwicky 23 and Family (2006)
Wehner, Elizabeth H., Gallagher, John S., Rudie, Gwen C., Cigan, Philip J.
II Zwicky 23 (UGC 3179) is a luminous, nearby compact narrow emission line starburst galaxy with blue optical colors and strong emission lines. We present a photometric and morphological study of II...
Andromeda IX: Properties of the faintest M31 dwarf satellite galaxy (2005)
Harbeck, Daniel, Gallagher, John S., Grebel, Eva K., Koch, Andreas, Zucker, Daniel B.
We present WIYN observations of the recently discovered And IX dwarf spheroidal (dSph) satellite galaxy of M31. Our data, obtained at a natural seeing of 0.5" and just reaching the horizontal-branch...
Conselice, Christopher J., O'Neil, Karen, Gallagher, John S., Wyse, Rosemary F. G.
We present in this paper the deepest Arecibo HI observations of Virgo cluster dwarf ellipticals (dEs) taken to date. Based on this data we argue that a significant fraction of Virgo cluster dEs...
The Progenitors of Dwarf Spheroidal Galaxies (2003)
Grebel, Eva K., Gallagher, John S., Harbeck, Daniel
Dwarf spheroidal (dSph) galaxies present an evolutionary puzzle that we explore in 40 early- and late-type dwarfs in the Local Group and nearby field. Although dSphs formed stars over extended...
Extragalactic Star Clusters: Speculations on the Future (2001)
Gallagher, John S., Grebel, Eva K.
We discuss the future possibilities for extragalactic star cluster research with the expected new ground-based and space-based telescopes and instrumentation. Significant gains are expected due to...
On the Nature of the NGC 1275 System (2001)
Conselice, Christopher J., Gallagher, John S., Wyse, Rosemary F. G.
Sub-arcsecond images, taken in B, R, and H-Alpha filters, and area spectroscopy obtained with the WIYN 3.5-m telescope provide the basis for an investigation of the unusual structures in the stellar...
Populations of Dwarfs in Clusters of Galaxies: Environmental Connections (2001)
Gallagher, John S., Conselice, Christopher J., Wyse, Rosemary F. G.
Despite their apparent fragile appearance, dwarf spheroidals are the most common galaxy type in clusters. In this paper we consider some of the issues associated with two major models for the origin...
Five Years of Magellanic Clouds Research: A Newsletter Editors' Perspective (2001)
Grebel, Eva K., Chu, You-Hua, Gallagher, John S., Harbeck, Daniel
We analyze the topical and demographic evolution of Magellanic Clouds research over the past five years based on submissions of abstracts of refereed papers to the electronic Magellanic Clouds...
Dynamics and the Origin of Low-Mass Galaxies in the Virgo Cluster (2001)
Conselice, Christopher J., Gallagher, John S., Wyse, Rosemary F. G.
Early-type dwarfs are the most common galaxy in the local universe, yet their origin and evolution remain a mystery. Various cosmological scenarios predict that dwarf-like galaxies in dense areas are...
The Measurement of Disk Ellipticity in Nearby Spiral Galaxies (2001)
Andersen, David R., Bershady, Matthew A., Sparke, Linda S., Gallagher, John S., Wilcots, Eric M.
We have measured the intrinsic disk ellipticity for 7 nearby, nearly face-on spiral galaxies by combining Densepak integral-field spectroscopy with I-band imaging from the WIYN telescope. Initially...
The Fossil Starburst in M82 (2000)
De Grijs, Richard, O'Connell, Robert W., Gallagher, John S.
(Abridged) We present high-resolution HST imaging in the optical (WFPC2) and near-infrared (NICMOS) of a disk region 1 kpc NE of the starburst core in the nearby galaxy M82. This region, M82 ``B,''...
Starbursts and the Evolution of Gas-Rich Galaxies (2000)
Gallagher, John S., Conselice, Christopher J., Matthews, Lynn D., Homeier, Nicole L.
Moderately luminous starbursts in the nearby universe often occur in disk galaxies that are at most subject to mild external perturbations. An investigation of this type of galaxy leads to a better...
Galaxies in the Universe : An Introduction (2000)
Sparke, Linda S., Gallagher, John S.
Contenido: Introducción; Mapa de la vía láctea; Las órbitas de las estrellas; Nuestro patio trasero: el grupo local; Galaxias espirales SO; Galaxias elípticas; Distribución en grande de...
Galaxies in the Universe : An Introduction (2000)
Sparke, Linda S., Gallagher, John S.
0-521-59740-4
Stellar Populations at the Center of IC 1613 (1999)
Cole, Andrew A., Tolstoy, Eline, Gallagher, John S., Hoessel, John G., Mould, Jeremy R., Holtzman, Jon A., ...
We have observed the center of the Local Group dwarf irregular galaxy IC 1613 with WFPC2 aboard the Hubble Space Telescope in the F439W, F555W, and F814W filters. We find a dominant old stellar...
WFPC2 Observations of Compact Star Cluster Nuclei in Low Luminosity Spiral Galaxies (1999)
Matthews, Lynn D., Gallagher, John S., Krist, John E., Watson, Alan M., Burrows, Christopher J., ...
We have used the Wide Field Planetary Camera 2 aboard the Hubble Space Telescope to image the compact star cluster nuclei of the nearby, late-type, low-luminosity spiral galaxies NGC 4395, NGC 4242,...
Stellar Populations and Ages of M82 Super Star Clusters (1998)
Gallagher, John S., Smith, Linda J.
We present high signal-to-noise optical spectra of two luminous super star clusters in the starburst galaxy M82. The data for cluster F and the nearby, highly reddened cluster L were obtained with...
Pressure-Volume-Temperature Relationships of Gases Virial Coefficients. (1998)
Tables of second virial coefficients as functions of temperature are presented for 14 gases. These gases are mainly noble gases and constituents of air. In most cases, these are based on a...
Furukawa, George T., Reilly, Martin L., Gallagher, John S.
The literature sources of heat-capacity data on ruthenium, rhodium, palladium, osmium, iridium, and platinum have been compiled and the data critically analyzed. Except for osmium where data are...
Thermodynamic Properties of Ammonia, (1998)
Haar, Lester, Gallagher, John S.
An analytic thermodynamic surface has been fitted to the experimental data for ammonia for the temperature range exceeding from the triple point to 750 kelvins and for the pressure range extending...
A Thermodynamic Surface for Water: The Formulation and Computer Programs, (1998)
Haar, Lester, Gallagher, John S., Kell, George S.
A FORTRAN 77 program is given with which thermodynamic properties for liquid and gaseous states for water can be calculated for the temperature and pressure range, 250 less than or equal to T(K) less...
Evolutionary Status of Dwarf ``Transition'' Galaxies (1998)
Knezek, Patricia M., Sembach, Kenneth R., Gallagher, John S.
We present deep B, R and Halpha imaging of 3 dwarf galaxies: NGC3377A, NGC4286, and IC3475. Based on previous broadband imaging and HI studies, these mixed-morphology galaxies were proposed by...
B and V CCD Photometry of Southern, Extreme Late-Type Spiral Galaxies (1997)
Matthews, Lynn D., Gallagher, John S.
We present B and V CCD aperture photometry for a morphologically-selected sample of forty-nine southern, extreme late-type spiral galaxies. All objects are moderate-to-low surface brightness Local...
WFPC2 Observations of the Cooling Flow Elliptical in Abell 1795 (1996)
Pinkney, Jason, Holtzman, Jon, Garasi, Chris, Watson, Alan M., Gallagher, John S.
We present WFPC2 images of the core of the cooling flow cD galaxy in Abell 1795. An irregular, asymmetric dust lane extends 7 \h75 kpc in projection to the north-northwest. The dust shares the...
A study of the development of the use of steel in freight car construction / (1915)
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1915.