Search Publications
Dust in the Local Interstellar Wind
Zank, Gary P.; Slavin, Jonathan D.; Geiss, Johannes +13 more
The gas-to-dust mass ratios found for interstellar dust within the solar system, versus values determined astronomically for the cloud around the solar system, suggest that large and small interstellar grains have separate histories and that large interstellar grains preferentially detected by spacecraft are not formed exclusively by mass exchange…
Observations of a Z = 1.44 Dusty, Ultraluminous Galaxy and Implications for Deep Submillimeter Surveys
Smail, Ian; Graham, James R.; Dey, Arjun +3 more
We present new near-infrared and optical spectroscopic observations that confirm the redshift of the z=1.44 extremely red object ERO J164502+4626.4 (object 10 of Hu & Ridgway, formerly known as HR 10 or [HR94] 10) and a Hubble Space Telescope image that reveals a reflected S-shaped morphology at (rest-frame) near-ultraviolet wavelengths. The c…
The Hα Luminosity Function and Global Star Formation Rate from Redshifts of 1-2
Teplitz, Harry I.; McCarthy, Patrick J.; Malumuth, Eliot M. +4 more
We present a luminosity function for Hα emission from galaxies at redshifts between 0.7 and 1.9 based on slitless spectroscopy with the near-infrared camera and multiobject spectrometer on the Hubble Space Telescope. The luminosity function is well fit by a Schechter function over the range 6×1041<L(Hα)<2×1043 ergs s
Signatures of the Youngest Starbursts: Optically Thick Thermal Bremsstrahlung Radio Sources in Henize 2-10
Kobulnicky, Henry A.; Johnson, Kelsey E.
VLA radio continuum imaging reveals compact (<8 pc)~1 mJy radio sources in the central 5" starburst region of the blue compact galaxy Henize 2-10. While the global radio continuum spectrum is a power law (Sν~να) indicative of nonthermal processes (α~=-0.5), the radio sources have positive (α>0.0) spectral indices sugges…
Hubble Space Telescope Space Telescope Imaging Spectrograph Coronagraphic Imaging of the Herbig AE Star AB Aurigae
Bruhweiler, F. C.; Lindler, Don J.; Boggess, A. +5 more
We present the first broadband, coronagraphic Hubble Space Telescope images of the bright, optically visible, isolated Herbig Ae star AB Aurigae. The Space Telescope Imaging Spectrograph (STIS) images reveal extended circumstellar nebulosity (r~1300 AU) covering the region of the millimeter continuum and CO disk. The structure is observed in the d…
The Magnitude-Size Relation of Galaxies out to z~1
Illingworth, Garth D.; Gebhardt, Karl; Faber, S. M. +6 more
As part of the Deep Extragalactic Evolutionary Probe (DEEP) survey, a sample of 190 field galaxies (I814<=23.5) in the ``Groth Survey Strip'' has been used to analyze the magnitude-size relation over the range 0.1<z<1.1. The survey is statistically complete to this magnitude limit. All galaxies have photometric structural param…
The Globular Cluster System in the Inner Region of M87
Kundu, Arunav; Whitmore, Bradley C.; Sparks, William B. +3 more
We have identified 1057 globular cluster candidates in a WFPC2 image of the inner region of M87. The globular cluster luminosity function (GCLF) can be well fitted by a Gaussian profile with a mean value of m0V=23.67+/-0.07 mag and σ=1.39+/-0.06 mag. The GCLF in five radial bins is found to be statistically the same at all po…
Modeling W44 as a Supernova Remnant in a Density Gradient with a Partially Formed Dense Shell and Thermal Conduction in the Hot Interior. I. The Analytical Model
Smith, Randall K.; Shelton, R. L.; Maciejewski, Witold +4 more
We show that many observations of W44, a supernova remnant in the Galactic plane at a distance of about 2500 pc, are remarkably consistent with the simplest realistic model. The model remnant is evolving in a smooth ambient medium of fairly high density, about 6 cm-3 on average, with a substantial density gradient. At the observed time …
A Reanalysis of the Ultraviolet Extinction from Interstellar Dust in the Large Magellanic Cloud
Gordon, Karl D.; Clayton, Geoffrey C.; Misselt, K. A.
We have reanalyzed the Large Magellanic Cloud's (LMC) ultraviolet (UV) extinction using data from the IUE final archive. Our new analysis takes advantage of the improved signal-to-noise ratio of the IUE NEWSIPS reduction, the exclusion of stars with very low reddening, the careful selection of well-matched comparison stars, and an analysis of the …
Mid-Infrared and Optical Spectroscopy of Ultraluminous Infrared Galaxies: A Comparison
Lutz, D.; Genzel, R.; Veilleux, S.
New tools from Infrared Space Observatory (ISO) mid-infrared spectroscopy have recently become available to determine the power sources of dust-obscured ultraluminous infrared galaxies (ULIRGs). We compare ISO classifications--starburst or active galactic nucleus (AGN)--with classifications from optical spectroscopy and with optical/near-infrared …