Search Publications
Missions
Journals
Publication Years
NaI and HI 3-D density distribution in the solar neighbourhood
Freire Ferrero, R.; Siebert, A.; Vergely, J. -L. +1 more
A study of the local interstellar medium (LISM) using a robust inversion method, similar to current tomography techniques, is applied to compiled data on neutral interstellar absorbers and Hipparcos parallaxes. We present here the 3-D distribution of two neutral species, NaI and HI. Our analysis enables us to obtain a reliable 3-D density distribu…
B1359+154: A Six-Image Lens Produced by a z ~= 1 Compact Group of Galaxies
Peng, C. Y.; Keeton, C. R.; Kochanek, C. S. +8 more
Hubble Space Telescope (HST) V- and I-band observations show that the gravitational lens B1359+154 consists of six images of a single zs=3.235 radio source and its star-forming host galaxy, produced by a compact group of galaxies at zl~=1. Very Long Baseline Array (VLBA) observations at 1.7 GHz strongly support this conclusio…
Far Ultraviolet Spectroscopic Explorer Observations of Molecular Hydrogen in Translucent Interstellar Clouds. II. The Line of Sight toward HD 110432
York, Donald G.; Roueff, E.; Shull, J. Michael +7 more
We report the second study from the FUSE survey of molecular hydrogen in translucent clouds for the line of sight toward HD 110432. This star lies beyond the Coalsack dark nebula, and, with E(B-V)=0.40 and AV=1.32, this line of sight bridges the gap between less-extinguished diffuse-cloud lines of sight with AV~1, such as ζ O…
Caltech Faint Galaxy Redshift Survey. XIII. Spectral Energy Distributions for Galaxies in the Region of the Hubble Deep Field North
Cohen, Judith G.
We introduce a new empirical function for modeling the spectral energy distributions (SEDs) of galaxies. We apply it to a sample of 590 galaxies in the region of the Hubble Deep Field (HDF) with z<1.5 using multicolor photometry with wide wavelength coverage combined with spectroscopic redshifts from our 93% complete R-selected redshift survey …
Heliospheric and Interstellar Phenomena Deduced From Pickup ion Observations
Gloeckler, George; Geiss, Johannes
Pickup ions, created by ionization of slow moving atoms and molecules well inside the heliosphere, provide us with a new tool to probe remote regions in and beyond the heliosphere and to study injection and acceleration processes in the solar wind. Comprehensive and continuous measurements of H, He, C, N, O, Ne and other pickup ions, especially wi…
2 Micron Narrowband Adaptive Optics Imaging in the Arches Cluster
Schaerer, D.; Schmutz, W.; Heydari-Malayeri, M. +3 more
Canada-France-Hawaii-Telescope adaptive optics bonnette images through narrowband filters in the K band are presented for the Arches cluster. Continuum fluxes, line fluxes, and equivalent widths are derived from high angular resolution images, some nearly diffraction limited, for the well-known massive stars in the Arches cluster. Images were obta…
The Infrared Surface Brightness Fluctuation Hubble Constant
Lauer, Tod R.; Ajhar, Edward A.; Rieke, Marcia J. +5 more
We measured infrared surface brightness fluctuation (SBF) distances to an isotropically distributed sample of 16 distant galaxies with redshifts reaching 10,000 km s-1 using the near-IR camera and multiobject spectrometer (NICMOS) on the Hubble Space Telescope (HST). The excellent spatial resolution, very low background, and brightness …
Star Formation History in the NICMOS Northern Hubble Deep Field
Thompson, Rodger I.; Weymann, Ray J.; Storrie-Lombardi, Lisa J.
We present the results of an extensive analysis of the star formation rates determined from the NICMOS deep images of the northern Hubble Deep Field. We use SED template fitting photometric techniques to determine both the redshift and the extinction for each galaxy in our field. Measurement of the individual extinctions provides a correction for …
A Revised Cepheid Distance to NGC 4258 and a Test of the Distance Scale
Zepf, Stephen E.; Davis, Marc; Madore, Barry F. +5 more
In a previous paper we reported a Hubble Space Telescope (HST) Cepheid distance to the galaxy NGC 4258 obtained using the calibrations and methods then standard for the Key Project. Here we reevaluate the Cepheid distance using the recently revised Key Project procedures. These revisions alter the zero points and slopes of the Cepheid period-lumin…
The complex iron line of NGC 5506
Piro, L.; Perola, G. C.; Fiore, F. +4 more
The bright Narrow Emission Line Galaxy, NGC 5506, has been observed simultaneously by XMM-Newton and BeppoSAX. The iron line is complex, with at least two components: one narrow and corresponding to neutral iron, the second one broad and corresponding to ionized iron. The latter line is equally well fitted by a truly broad line or by a blend of He…