Science Archives Publication System

Unveiling the Hidden Nucleus of IC 5063 with NICMOS

DOI: 10.1086/311104 Bibcode: 1998ApJ...492L.121K

Colina, L.; Calzetti, D.; Axon, D. +16 more

We present high-resolution near-infrared images of the Seyfert 2 galaxy IC 5063 obtained using the Near-Infrared Camera and Multiobject Spectrometer (NICMOS) in broadband filters at 1.1, 1.6, and 2.2 µm (FWHM ~ 0.21" at 2.2 µm). The images show a very red, unresolved point source at the center of the galaxy, confirming the existence of…

1998 • The Astrophysical Journal

eHST 27

Molecular Gas in the Inner 100 Parsecs of M51

DOI: 10.1086/311128 Bibcode: 1998ApJ...493L..63S

Yun, M. S.; Armus, L.; Scoville, N. Z. +1 more

We report imaging of CO (2-1) emission in the nucleus of M51 at 1^'' (47 pc) resolution. Molecular gas is found closely associated with the nuclear radio jet and the X-shaped dust absorption feature seen in the Hubble Space Telescope images. The CO emission lies along the side of the nuclear radio continuum ``jet.'' The strongest molecul…

1998 • The Astrophysical Journal

eHST 27

ISOCAM Imaging of Comets 65P/Gunn and 46P/Wirtanen

DOI: 10.1006/icar.1998.5944 Bibcode: 1998Icar..134...35C

Fulle, M.; Mennella, V.; Colangeli, L. +4 more

In this paper we present images of Comets 65P/Gunn and 46P/Wirtanen obtained by means of ISOCAM in the broadband filters at 9.62 (LW7) and 15.00 µm (LW3). The observations were performed on 23 March 1996 and on 9 November 1996, respectively. The aim of this work is to analyze the coma and tail dust environment of the targets. The application…

1998 • Icarus

ISO 27

The Height Structure of the Solar Atmosphere from the Extreme-Ultraviolet Perspective

DOI: 10.1086/311587 Bibcode: 1998ApJ...504L.127Z

Kundu, M. R.; White, S. M.; Zhang, Jie

We investigate the structure of the solar chromosphere and transition region using full Sun images obtained with the Extreme-Ultraviolet Imaging Telescope (EIT) aboard the Solar and Heliospheric Observatory spacecraft. The limb seen in the EIT coronal images (taken in lines of Fe IX/X at 171 Å, Fe XII at 195 Å, and Fe XV at 284 Å) is an absorption…

1998 • The Astrophysical Journal

SOHO 27

The Hubble Space Telescope Extragalactic Distance Scale Key Project. IX. The Discovery of Cepheids in NGC 2090

DOI: 10.1086/305766 Bibcode: 1998ApJ...500..763P

Illingworth, Garth D.; Huchra, John P.; Kennicutt, Robert C. +15 more

We report on the discovery of 34 Cepheid variables in NGC 2090, with periods ranging between 5 and 58 days. Apparent V and I period-luminosity relations for Cepheids with P >= 10 days have been constructed, assuming a fiducial distance modulus, µ₀, of 18.50 +/- 0.10 mag and a reddening, E(B-V), of 0.10 mag for the Large Magella…

1998 • The Astrophysical Journal

eHST 27

High-Resolution Mid-Infrared Imaging of the Nucleus of NGC 1068

DOI: 10.1086/311559 Bibcode: 1998ApJ...504L...5B

Bock, J. J.; Marsh, K. A.; Ressler, M. E. +1 more

We have obtained mid-infrared images of the nucleus of NGC 1068 from the Hale 5 m telescope at Mount Palomar with diffraction-limited resolution and high sensitivity at λ=8.8, 10.3, and 12.5 µm. Deconvolved images show that the infrared emission extends north to south in the inner 2", consisting of a central peak, a component extending 1" no…

1998 • The Astrophysical Journal

eHST 27

Absolute Vacuum Ultraviolet Oscillator Strengths in CO II and the Interstellar Cobalt Abundance

DOI: 10.1086/305780 Bibcode: 1998ApJ...500.1064M

Federman, S. R.; Lawler, J. E.; Mullman, K. L. +1 more

We report the first laboratory measurements of 10 absolute oscillator strengths (f-values) for vacuum ultraviolet lines of Co II. The oscillator strengths are measured with the High-Sensitivity Absorption Spectroscopy Experiment at the University of Wisconsin. The measurements serve as a test of theoretical work on Co II f-values and set an absolu…

1998 • The Astrophysical Journal

eHST 26

Hubble Space Telescope Observations of NGC 121: First Detection of Blue Stragglers in an Extragalactic Globular Cluster

DOI: 10.1086/306423 Bibcode: 1998ApJ...508..570S

Fall, S. Michael; Rich, R. Michael; Shara, Michael M. +1 more

We have resolved stars in the core of the old SMC globular cluster NGC 121 with images from the refurbished Hubble Space Telescope and Wide Field Planetary Camera 2. Our photometry reaches 1.5 mag below the main-sequence turnoff, with negligible field contamination. A blue straggler star (BSS) sequence of 42 candidates is clearly seen--the first s…

1998 • The Astrophysical Journal

eHST 26

High-Metallicity Mg II Absorbers in the z < 1 Lyα Forest of PKS 0454+039: Giant Low Surface Brightness Galaxies?

DOI: 10.1086/305681 Bibcode: 1998ApJ...499..677C

Churchill, Christopher W.; Le Brun, Vincent

We report the discovery of two iron-group enhanced high-metallicity Mg II absorbers in a search through 28 Lyα forest clouds along the PKS 0454+039 sight line. Based upon our survey and the measured redshift number densities of W_r(Mg II) <= 0.3 Å absorbers and Lyα absorbers at z ~ 1, we suggest that roughly 5% of Lyα absorbers at z &…

1998 • The Astrophysical Journal

eHST 26

Spatial Gradients and the Volumetric Tensor

Bibcode: 1998ISSIR...1..307H

Harvey, Christopher C.

1998 • ISSI Scientific Reports Series

Cluster 26