Tracy E. Clarke

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The Long Wavelength Array (LWA) will be a new, open, user-oriented astronomical instrument operating in the relatively unexplored window from 20-80 MHz at arcsecond level resolution. Operated by the University of New Mexico on behalf of the Southwest Consortium (SWC) the LWA will provide a unique training ground for the next generation of radio astronomers.(More)
We present results from a deep Chandra observation of Abell 2052. A2052 is a bright, nearby, cooling flow cluster, at a redshift of z = 0.035. Concentric surface brightness discontinuities are revealed in the cluster center, and these features are consistent with shocks driven by the active galactic nucleus (AGN), both with Mach numbers of approximately(More)
A previous analysis of the Chandra X-ray image of the center of the cooling core cluster Abell 2597 showed two “ghost holes” in the X-ray emission to the west and northeast of the central radio galaxy PKS 2322−123. Previous radio observations did not detect any radio emission coming from the interior of the X-ray holes. We present new low frequency radio(More)
Gravitational waves have been detected from a binary neutron star merger event, GW170817. The detection of electromagnetic radiation from the same source has shown that the merger occurred in the outskirts of the galaxy NGC 4993, at a distance of 40 megaparsecs from Earth. We report the detection of a counterpart radio source that appears 16 days after the(More)
New Chandra X-ray and Herschel Far-Infrared (FIR) observations enable a multiwavelength study of active galactic nucleus (AGN) heating and intracluster medium (ICM) cooling in the brightest cluster galaxy (BCG) of Abell 2597 (z = 0.0821). The new Chandra observations reveal the central 30 kpc X-ray cavity network to be more extensive than previously(More)
We present new Chandra X-ray observations of the brightest cluster galaxy (BCG) in the cool-core cluster Abell 2597 (z = 0.0821). The data reveal an extensive kpc-scale X-ray cavity network as well as a 15-kpc filament of soft-excess gas exhibiting strong spatial correlation with archival Very Large Array radio data. In addition to several possible(More)
The brightest cluster radio halo known resides in the Coma cluster of galaxies. The relativistic electrons producing this diffuse synchrotron emission should also produce inverse Compton emission that becomes competitive with thermal emission from the ICM at hard X-ray energies. Thus far, claimed detections of this emission in Coma are controversial (e.g.,(More)
The first station of the Long Wavelength Array (LWA1) was completed in April 2011 and is currently performing observations resulting from its first call for proposals in addition to a continuing program of commissioning and characterization Department of Physics and Astronomy, University of New Mexico, Albuquerque NM, 87131, USA Greg Taylor is also an(More)
We present a Chandra observation of the cooling flow cluster A262. Spectral fits show that the intracluster medium (ICM) in A262 cools by a factor of 3, from 2.7 to 0.9 keV, at the cluster center. A mass deposition rate of Ṁ 1⁄4 19þ6 5 M yr 1 is measured. Complex structure is found in the very inner regions of the cluster, including knots of emission and a(More)
We have detected an X-ray absorption feature against the core of the galaxy cluster Abell 2029 (z = 0.0767) which we identify with the foreground galaxy UZC J151054.6+054313 (z = 0.0221). Optical observations (B, V , R, and I) indicate that it is an Scd galaxy seen nearly edge-on at an inclination of 87±3. H i observations give a rotation velocity of 108 km(More)