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25 papers · 2 filters
A revised Cepheid distance to NGC 4258 and a test of the distance scale
Jeffrey A. Newman, Laura Ferrarese, Peter B. Stetson +5
In a previous paper (Maoz et al. 1999), we reported a Hubble Space Telescope (HST) Cepheid distance to the galaxy NGC 4258 obtained using the calibrations and methods then standard…
The Interstellar Medium of Star-forming Irregular Galaxies: The View with ISO
D. Hunter, M. Kaufman, D. Hollenbach +8
We present mid-infrared imaging and far-infrared (FIR) spectroscopy of 5 IBm galaxies observed by ISO as part of our larger study of the inter- stellar medium of galaxies. Most of…
Singular Isothermal Disks: II. Nonaxisymmetric Bifurcations and Equilibria
Daniele Galli, Frank H. Shu, Gregory Laughlin +1
We review the difficulties of the classical fission and fragmentation hypotheses for the formation of binary and multiple stars. A crucial missing ingredient in previous theoretica…
Evidence for the Heating of Atomic Interstellar Gas by PAHs
George Helou, Sangeeta Malhotra, David J. Hollenbach +2
We report a strong correlation between the [CII] 158 micron cooling line and the mid-infrared flux in the 5-10 micron range in a wide variety of star-forming galaxies. The mid-infr…
Histogram Analysis of Gallex, GNO and Sage Neutrino Data: Further Evidence for Variability of the Solar Neutrino Flux
Peter A. Sturrock, Jeffrey D. Scargle
If the solar neutrino flux were constant, as is widely assumed, the histogram of flux measurements would be unimodal. On the other hand, sinusoidal or square-wave modulation (eithe…
Extended [C I] and ^{13}CO(5-4) Emission in M17SW
J. E. Howe, M. L. N. Ashby, E. A. Bergin +19
We mapped a 13 by 22 pc region in emission from 492 GHz [C I] and, for the first time, 551 GHz ^{13}CO(5-4) in the giant molecular cloud M17SW, using the Submillimeter Wave Astrono…