165 citations · 1.3k across the 24 of their papers we have counts for
22 papers
Detection of a Radio Bubble around the Ultraluminous X-ray Source Holmberg IX X-1
Ciprian T. Berghea, Megan C. Johnson, Nathan J. Secrest +3
We present C and X-band radio observations of the famous utraluminous X-ray source (ULX) Holmberg IX X-1, previously discovered to be associated with an optical emission line nebul…
Discovery of the first quadruple gravitationally lensed quasar candidate with Pan-STARRS
C. T. Berghea, G. J. Nelson, C. E. Rusu +2
We report the serendipitous discovery of the first gravitationally lensed quasar candidate from Pan-STARRS. The grizy images reveal four point-like images with magnitudes between 1…
Spitzer IRAC observations of IR excess in Holmberg IX X-1: A circumbinary disk or a variable jet?
R. P. Dudik, C. T. Berghea, T. P. Roberts +4
We present Spitzer Infrared Array Camera (IRAC) photometric observations of the Ultra-luminous X-ray Source (ULX, X-1) in Holmberg IX. We construct a spectral energy distribution (…
A Global Astrometric Solution for Pan-STARRS referenced to ICRF2
C. T. Berghea, V. V. Makarov, J. Frouard +13
We describe development and application of a Global Astrometric Solution (GAS) to the problem of Pan-STARRS1 (PS1) astrometry. Current PS1 astrometry is based on differential astro…
Identification of 1.4 Million AGNs in the Mid-Infrared using WISE Data
Nathan Secrest, Rachel Dudik, Bryan Dorland +5
We present an all-sky sample of ~ 1.4 million AGNs meeting a two color infrared photometric selection criteria for AGNs as applied to sources from the Wide-Field Infrared Survey Ex…
The Local Environment of Ultraluminous X-ray Sources Viewed by XMM Newton's Optical Monitor
Ciprian T. Berghea, Rachel P. Dudik, Jonathan Tincher +1
We have used XMM-Newton's Optical Monitor (OM) images to study the local environment of a sample of 27 Ultraluminous X-ray Sources (ULXs) in nearby galaxies. UVW1 fluxes were extra…