Search Publications
N-Band Observations of Henize 2-10: Unveiling the Dusty Engine of a Starburst Galaxy
Johnson, Kelsey E.; Vacca, William D.; Conti, Peter S.
As part of an ongoing program to better understand the early stages of massive star cluster evolution and the physical conditions for their formation, we have obtained J, H, K', and N (10.8 µm) images of the nuclear region of the starburst galaxy He 2-10. The N-band images were obtained with the Gemini North Telescope. In only 10 minutes of …
Internal Velocities in the Orion Nebula: Large Proper-Motion Features
Hartigan, Patrick; O'Dell, C. R.; Doi, Takao
The proper motions of Herbig-Haro (HH) objects in the Orion Nebula were measured with a +/-10 km s-1 accuracy using the Hubble Space Telescope Wide Field Planetary Camera 2 images in [S II], [N II], Hα, and [O III], taken 4-6 yr apart. Seven HH flows in the outer region as well as seven HH objects in the inner region of the BN-KL comple…
Core Radio and Optical Emission in the Nuclei of nearby FR I Radio Galaxies
Baum, Stefi A.; O'Dea, Christopher P.; de Zeeuw, P. Tim +1 more
In this paper we analyze the relation between radio, optical continuum and Hα+[N II] emission from the cores of a sample of 21 nearby Fanaroff and Riley type I galaxies as observed with the VLBA and HST. The emission arises inside the inner tens of parsecs of the galaxies. Core radio emission is observed in 19/20 galaxies, optical core continuum e…
Evidence for Cluster Evolution from an Improved Measurement of the Velocity Dispersion and Morphological Fraction of Cluster 1324+3011 at z=0.76
Postman, Marc; Lubin, Lori M.; Oke, J. B.
We have carried out additional spectroscopic observations in the field of cluster Cl 1324+3011 at z=0.76. Combined with the spectroscopy recently presented by Postman, Lubin, & Oke, we now have spectroscopically confirmed 47 cluster members. With this significant number of redshifts, we measure accurately the cluster velocity dispersion to be …
The Gravitational Lens-Galaxy Group Connection. I. Discovery of a Group Coincident with CLASS B0712+472
Fassnacht, C. D.; Lubin, L. M.
Previous observations of the environments of the lensing galaxies in gravitational lens systems suggest that many of the lensing galaxies are associated with small groups of galaxies. As a result, we have begun a coordinated program to study the local environments of all known gravitational lens systems. In this paper, we present results on the gr…
The ARAUCARIA Project: Deep Near-Infrared Survey of Nearby Galaxies. I. The Distance to the Large Magellanic Cloud from K-Band Photometry of Red Clump Stars
Gieren, W.; Pietrzyński, G.
We have obtained deep imaging in the near-infrared J and K bands for two nearby fields in the bar of the LMC with the ESO New Technology Telescope, under exquisite seeing conditions. The K, J-K color-magnitude diagrams constructed from these data are of outstanding photometric quality and reveal the presence of several hundred red clump stars. Usi…
What Are the Hot R Coronae Borealis Stars?
De Marco, Orsola; Clayton, Geoffrey C.; Clark, J. S. +3 more
We investigate the evolutionary status of four stars: V348 Sgr, DY Cen, and MV Sgr in the Galaxy and HV 2671 in the LMC. These stars have in common random deep declines in visual brightness, which are characteristic of R Coronae Borealis (RCB) stars. RCB stars are typically cool hydrogen-deficient supergiants. The four stars studied in this paper …
The Infrared Space Observatory Deep Asteroid Search
Tedesco, Edward F.; Desert, François-Xavier
A total of six deep exposures (using the astronomical observation template CAM01 with a 6" pixel field of view) through the ISOCAM LW10 filter (IRAS band 1, i.e., 12 µm) were obtained on a ~15' square field centered on the ecliptic plane. Point sources were extracted using the technique described in 1999 by Désert et al. Two known asteroids …
NGC 4314. IV. Photometry of Star Clusters with the Hubble Space Telescope: History of Star Formation in the Vicinity of a Nuclear Ring
Smith, Beverly J.; Jørgensen, Inger; Kenney, Jeffrey D. P. +2 more
Using Hubble Space Telescope (HST) WFPC2 images, we have obtained U, B, V, I, and Hα photometry for 76 star clusters in the nuclear star-forming ring of the barred spiral galaxy NGC 4314. These clusters are likely associated with an inner inner Lindblad resonance (IILR). The blue colors and Hα emission for most of these clusters imply very young a…
Structural Parameters and Dynamical Masses for Globular Clusters in M33
Brodie, Jean P.; Huchra, John P.; Sarajedini, Ata +1 more
Using high-dispersion spectra from the HIRES echelle spectrograph on the Keck I telescope, we measure velocity dispersions for four globular clusters (GCs) in M33. Combining the velocity dispersions with integrated photometry and structural parameters derived from King-Michie model fits to Wide Field Planetary Camera 2 images, we obtain mass-to-li…