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The Star Formation Rate and Dense Molecular Gas in Galaxies
HCN luminosity is a tracer of dense molecular gas, n(H(2)) greater than or similar to3 x 10(4) cm(-3), associated with star-forming giant molecular cloud (GMC) cores. We present the results andExpand
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HCN SURVEY OF NORMAL SPIRAL, INFRARED-LUMINOUS, AND ULTRALUMINOUS GALAXIES
We report systematic HCN J = 1-0 (and CO) observations of a sample of 53 infrared (IR) and/or CO-bright and/or luminous galaxies, including seven ultraluminous infrared galaxies, nearly 20 luminousExpand
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Connecting Dense Gas Tracers of Star Formation in our Galaxy to High-z Star Formation
Observations have revealed prodigious amounts of star formation in starburst galaxies as traced by dust and molecular emission, even at large redshifts. Recent work shows that for both nearby spiralExpand
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THE MOLECULAR GAS IN LUMINOUS INFRARED GALAXIES. II. EXTREME PHYSICAL CONDITIONS AND THEIR EFFECTS ON THE X co FACTOR
In this work, we conclude the analysis of our CO line survey of luminous infrared galaxies (LIRGs: L-IR greater than or similar to 10(11) L-circle dot) in the local universe (Paper I) by focusing onExpand
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The molecular gas in Luminous Infrared Galaxies I: CO lines, extreme physical conditions, and their drivers
We report results from a large molecular line survey of luminous infrared galaxies (L-IR greater than or similar to 10(11) L-circle dot) in the local Universe (z less than or similar to 0.1),Expand
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Major-merger Galaxy Pairs in the COSMOS Field—Mass-dependent Merger Rate Evolution since z = 1
We present results of a statistical study of the cosmic evolution of the mass-dependent major-merger rate since z = 1. A stellar mass limited sample of close major-merger pairs (the CPAIR sample) wasExpand
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Molecular Gas and the Modest Star Formation Efficiency in the “Antennae” Galaxies: Arp 244 = NGC 4038/9
We report here a factor of 5.7 higher total CO flux in Arp 244 (the "Antennae" galaxies) than that previously accepted in the literature (thus a total molecular gas mass of 1.5 × 1010 M☉), based onExpand
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Nonnuclear Hyper/Ultraluminous X-Ray Sources in the Starbursting Cartwheel Ring Galaxy
We report the Chandra/ACIS-S detection of more than 20 ultraluminous X-ray sources (ULXs, L0.5−10keV > �3 × 10 39 ergss −1 ) in the Cartwheel collisional ring galaxy system, of which over a dozen areExpand
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Molecular Gas Depletion and Starbursts in Luminous Infrared Galaxy Mergers
Most luminous infrared galaxies (LIGs) are closely interacting/merging systems that are rich in molecular gas. Here we study the relationship between the stage of the galaxy-galaxy interactions, theExpand
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HCN Observations of Dense Star-Forming Gas in High Redshift Galaxies
We present here the sensitive HCN ( 1 - 0) observations made with the VLA of two submillimeter galaxies and two QSOs at high redshift. HCN emission is the signature of dense molecular gas found inExpand
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