Search Publications
The Transformation of Cluster Galaxies at Intermediate Redshift
Ford, H. C.; Demarco, R.; Infante, L. +40 more
We combine imaging data from the Advanced Camera for Surveys (ACS) with VLT/FORS optical spectroscopy to study the properties of star-forming galaxies in the z=0.837 cluster Cl 0152-1357. We have morphological information for 24 star-forming cluster galaxies, which range in morphology from late-type and irregular to compact early-type galaxies. We…
Extragalactic Source Counts in the 20-50 keV Energy Band from the Deep Observation of the Coma Region by INTEGRAL IBIS
Sunyaev, R.; Krivonos, R.; Churazov, E. +3 more
We present the analysis of serendipitous sources in a deep, 500 ks, hard X-ray observation of the Coma Cluster region with the IBIS instrument on board INTEGRAL. In addition to the Coma Cluster, the final 20-50 keV image contains 12 serendipitous sources with statistical significance >4 σ. We use these data (after correcting for expected number…
The Connection between the Narrow-Line Region and the UV Absorbers in Seyfert Galaxies
Kraemer, S. B.; Crenshaw, D. M.
We present evidence that the outflowing UV absorbers in Seyfert 1 galaxies arise primarily in their inner narrow- (emission-) line regions (NLRs), based on similarities in their locations, kinematics, and physical conditions. Hubble Space Telescope observations show that nearly all Seyfert galaxies have bright, central knots of [O III] emission in…
Spatially Resolved Spectroscopy and Coronagraphic Imaging of the TW Hydrae Circumstellar Disk
Weinberger, Alycia J.; Roberge, Aki; Malumuth, Eliot M.
We present the first spatially resolved spectrum of scattered light from the TW Hydrae protoplanetary disk. This nearly face-on disk is optically thick, surrounding a classical T Tauri star in the nearby 10 Myr old TW Hya association. The spectrum was taken with the Hubble Space Telescope (HST) STIS CCD, providing resolution R~360 over the wavelen…
A Far-Ultraviolet Spectroscopic Survey of Luminous Cool Stars
Young, P. R.; Linsky, J. L.; Lobel, A. +3 more
The Far Ultraviolet Spectroscopic Explorer (FUSE) ultraviolet spectra of eight giant and supergiant stars reveal that high-temperature (3×105 K) atmospheres are common in luminous cool stars and extend across the color-magnitude diagram from α Car (F0 II) to the cool giant α Tau (K5 III). Emission present in these spectra includes chrom…
The Araucaria Project: The Effect of Blending on the Cepheid Distance to NGC 300 from Advanced Camera for Surveys Images
Bresolin, Fabio; Kudritzki, Rolf-Peter; Gieren, Wolfgang +1 more
We have used the Advanced Camera for Surveys aboard the Hubble Space Telescope (HST) to obtain F435W, F555W, and F814W single-epoch images of six fields in the spiral galaxy NGC 300. Taking advantage of the superb spatial resolution of these images, we have tested the effect that blending of the Cepheid variables studied from the ground with close…
Hubble Space Telescope NICMOS Imaging of W3 IRS 5: A Trapezium in the Making?
Megeath, S. T.; Wilson, T. L.; Corbin, M. R.
We present Hubble Space Telescope NICMOS imaging of W3 IRS 5, a binary high-mass protostar. In addition to the two protostars, NICMOS images taken in the F222M and F160W filters show three new 2.22 µm sources with very red colors; these sources fall within a region 5600 AU in diameter and are coincident with an ~100 Msolar, dense …
Ring Analysis of Solar Subsurface Flows and Their Relation to Surface Magnetic Activity
Howe, R.; Komm, R.; Hill, F. +3 more
We measure the horizontal flows in the outer 2% of the Sun by analyzing 14 consecutive Carrington rotations of Global Oscillation Network Group (GONG) Doppler images and two of Michelson Doppler Imager (MDI) Dynamics Program data with the ring-diagram technique. The zonal and meridional flows show no variation with activity at low to medium activi…
A High Angular Resolution Search for the Progenitor of the Type Ic Supernova 2004gt
Cenko, S. B.; Kulkarni, S. R.; Matthews, K. +6 more
We report the results of a high spatial resolution search for the progenitor of Type Ic supernova SN 2004gt, using the newly commissioned Keck laser guide star adaptive optics (LGSAO) system along with archival Hubble Space Telescope data. This is the deepest search yet performed for the progenitor of any Type Ib/c event in a wide wavelength range…
A Hubble Space Telescope Search for Substellar Companions in the Young Cluster IC 348
Luhman, K. L.; McLeod, K. K.; Goldenson, N.
We present the results of a search for substellar companions to members of the star-forming cluster IC 348. Using the Wide Field Planetary Camera 2 on board the Hubble Space Telescope, we have obtained deep, high-resolution images of the cluster through the F791W and F850LP filters. These data encompass 150 known members of IC 348, including 14 pr…