8 papers · 1 filter
Faint Source Counts from the Off-source fluctuation Analysis on the Deepest Chandra Fields
Takamitsu Miyaji, Richard E. Griffiths
We show the results of the fluctuation analysis applied to the off-source areas from the two 1 Million second Chandra Deep Fields, including our new results on the Chandra Deep Fie…
First Results from the XMM-Newton Observation in the Groth-Westphal Survey Strip Region
T. Miyaji, R. E. Griffiths
We present the first results of the XMM-Newton observation on the Groth-Westphal Strip Field. The scheduled exposure time was 70 [ks]. We first analyzed about 50 [ks] of calibrated…
Resolving the X-ray Spectral Paradox: XMM-Newton Spectra of Faint Sources in the Lockman Hole
R. E. Griffiths, A. Ptak, T. Miyaji
Using 100ks of XMM-Newton data on the Lockman Hole, we show how the X-ray background 'spectral paradox' is being resolved. We find the summed spectra of the Type I AGN, Type II AGN…
Disk and Bulge Morphology of WFPC2 galaxies: The HST Medium Deep Survey database
Kavan U. Ratnatunga, Richard E. Griffiths, Eric J. Ostrander
Quantitative morphological and structural parameters are estimated for galaxies detected in HST observations of WFPC2 survey fields. A modeling approach based on maximum likelihood…
Evidence for Galaxy Interactions/Mergers from Meduim-Deep Survey WFPC2 Data
L. W. Neuschaefer, M. Im, K. U. Ratnatunga +2
We examine the morphological and statistical properties of close galaxy pairs from two sets of 28 WFPC2 fields, acquired for the Medium Deep Survey (MDS) and the Groth/Westphal Sur…
Caught in the act: The identification of the galaxies responsible for the faint blue excess
Simon P. Driver, Rogier A. Windhorst, Richard E. Griffiths
We summarise recent Hubble Space Telescope results on the morphology of faint field galaxies. Our two principle results are: (1) the galaxies responsible for the faint blue excess…