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Dive into the research topics where Steven R. Majewski is active.

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Featured researches published by Steven R. Majewski.


The Astrophysical Journal | 2008

The Origin of the Magellanic Stream and Its Leading Arm

David L. Nidever; Steven R. Majewski; W. Butler Burton

We explore the Magellanic Stream (MS) using a Gaussian decomposition of the H I velocity proles in the Leiden-Argentine-Bonn (LAB) all-sky H I survey. This decomposition exposes the MS to be composed of two laments distinct both spatially (as rst pointed out by Putman et al.) and in velocity. Using the velocity coherence of the laments, one can be traced back to its origin in what we identify as the SouthEast H I Overdensity (SEHO) of the Large Magellanic Cloud (LMC), which includes 30 Doradus. Parts of the Leading Arm (LA) can also be traced back to the SEHO in velocity and position. Therefore, at least one-half of the trailing Stream and most of the LA originates in the LMC, contrary to previous assertions that both the MS and the LA originate in the Small Magellanic Cloud (SMC) and/or in the Magellanic Bridge. The two MS laments show strong periodic, undulating spatial and velocity patterns that we speculate are an imprint of the LMC rotation curve. If true, then the drift rate of the Stream gas away from the Magellanic Clouds is 49 km s 1 and the age of the MS is 1.74 Gyr. The Staveley-Smith et al. high-resolution H I data of the LMC show gas outows from supergiant shells in the SEHO that seem to be creating the LA and LMC lament of the MS. Blowout of LMC gas is an eect not previously accounted for but one that probably plays an important role in creating the MS and LA. Subject headings: Galaxies: interactions { Galaxies: kinematics and dynamics { Galaxies: Local Group { Galaxy: halo { Intergalactic Medium { Magellanic Clouds { Radio Lines: general


The Astrophysical Journal | 2007

Unveiling the Boxy Bulge and Bar of the Andromeda Spiral Galaxy

Rachael L. Beaton; Steven R. Majewski; Puragra Guhathakurta; Michael F. Skrutskie; Roc Michael Cutri; John C. Good; Richard J. Patterson; E. Athanassoula; Martin Bureau

A new, 2.8 deg^2 J, H, Ks near-infrared (NIR) survey from the 2MASS 6X program across the extent of the optical disk of the Andromeda (M31) galaxy provides a clear view of the M31 center almost completely unfettered by dust extinction and reveals a high-contrast bulge with very boxy isophotes dominating the NIR light to a semimajor axis of ~700 (2.6 kpc). The inner bulge (≾50) isophotes are relatively circular but show some twisting. Beyond this, (1) the M31 bulge ellipticity increases, (2) its position angle is constant at ~50°, or about 10° higher than the position angle of the M31 disk, and (3) its boxiness increases to a degree (~3%-4%) comparable to other renowned examples of boxy bulges observed in the NIR. In a companion paper, self-consistent N-body simulations of a classical bulge plus a bar with a boxy bulge are shown to reproduce the observed NIR M31 features presented here. Beyond the boxy bulge region and nearly along the 40° position angle of the disk a narrow ridge of NIR flux, which can be identified with the thin part of the bar, more or less symmetrically extends into the inner disk at semimajor axis radii of 700-1200 or more. Little variation in the morphology or relative brightnesses of these various M31 structures is seen across the NIR bands (e.g., no color gradients are seen). These new data verify that M31 is a barred spiral galaxy like the Milky Way.


The Astronomical Journal | 2003

2MASS Studies of Differential Reddening across Three Massive Globular Clusters

David R. Law; Steven R. Majewski; Michael F. Skrutskie; John M. Carpenter; Hina F. Ayub

J-, H-, and Ks-band data from the Two Micron All Sky Survey (2MASS) are used to study the effects of differential reddening across the three massive Galactic globular clusters ω Centauri, NGC 6388, and NGC 6441. Evidence is found that variable extinction may produce false detections of tidal tails around ω Centauri. We also investigate what appears to be relatively strong differential reddening toward NGC 6388 and NGC 6441 and find that differential extinction may be exaggerating the need for a metallicity spread to explain the width of the red giant branches for these two clusters. Finally, we consider the implications of these results for the connection between unusual, multipopulation globular clusters and the cores of dwarf spheroidal galaxies (dSph).


Publications of the Astronomical Society of the Pacific | 2005

The Fan Observatory Bench Optical Spectrograph (FOBOS)

Jeffrey D. Crane; Steven R. Majewski; Richard J. Patterson; Michael F. Skrutskie; Elena Y. Adams; Peter M. Frinchaboy

ABSTRACT The Fan Observatory Bench Optical Spectrograph (FOBOS) is intended for single‐object optical spectroscopy at moderate resolution ( documentclass{aastex} usepackage{amsbsy} usepackage{amsfonts} usepackage{amssymb} usepackage{bm} usepackage{mathrsfs} usepackage{pifont} usepackage{stmaryrd} usepackage{textcomp} usepackage{portland,xspace} usepackage{amsmath,amsxtra} usepackage[OT2,OT1]{fontenc} newcommandcyr{ renewcommandrmdefault{wncyr} renewcommandsfdefault{wncyss} renewcommandencodingdefault{OT2} normalfont selectfont} DeclareTextFontCommand{textcyr}{cyr} pagestyle{empty} DeclareMathSizes{10}{9}{7}{6} begin{document} landscape


STELLAR ASTROPHYSICS WITH THE WORLD'S LARGEST TELESCOPES: First International Workshop on Stellar Astrophysics with the World's Largest Telescopes | 2005

Dynamics of Disrupting Milky Way Satellite Galaxies and Tidal Streams

Steven R. Majewski; Ricardo R. Munoz; Kyle B. Westfall; Richard J. Patterson

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arXiv: Astrophysics | 2003

Modeling the Tidal Tails of the Sagittarius Dwarf Galaxy

David R. Law; Steven R. Majewski; Kathryn V. Johnston; Michael F. Skrutskie

end{document} ) using a fiber‐fed, bench‐mounted design to maintain stability. Whenever possible, the instrument uses off‐the‐shelf components to maintain a modest cost. FOBOS supports Galactic astronomy projects that require consistently well‐measured (∼5 km s−1) radial velocities for large numbers of broadly distr...


Archive | 1998

A Search for Tidal Star Streams from the Magellanic Clouds

James Craig Ostheimer; Steven R. Majewski; William E. Kunkel; Kathryn V. Johnston

The nature of the Galactic dSph satellites remains controversial. Do they have extreme M/L? Are they tidally disrupting? Do they contribute significantly to the creation of the halo and halo substructure? Does mass follow light in these Systems? Great insight into these questions will come from high quality radial velocity surveys over large areas, especially for dSph stars well outside the nominal King limiting radii. For most satellites, this work is the realm of 8‐m class echelle spectroscopy, however, the density of suitable stars outside the tidal radius is low enough that little advantage is conferred by most multi‐object spectrographic systems. Worse, the density of good candidates is so low compared to that of foreground Milky Way dwarf stars that clever pre‐filtering is needed to make efficient use of telescopes like SALT for this type of science.


Archive | 2010

The Magellanic Stream

David L. Nidever; Steven R. Majewski; William Butler Burton


Archive | 2007

Mapping Galactic Halo and Dwarf Spheroidal Structure with Giant Stars

Ricardo R. Munoz; Steven R. Majewski; Kathryn V. Johnston; Richard J. Patterson


arXiv: Astrophysics | 2001

The Metallicity Distribution Function of Omega Centauri

Peter M. Frinchaboy; Jaehyon Rhee; James Craig Ostheimer; Steven R. Majewski; Richard J. Patterson; Winfrey Y. Johnson; Dana I. Dinescu; Christopher Palma; Kyle B. Westfall; William B. Kunkel

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William E. Kunkel

Carnegie Institution for Science

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David R. Law

Space Telescope Science Institute

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