Search Publications
Tracing the Outer Halo in a Giant Elliptical to 25 R eff
Rejkuba, M.; Greggio, L.; Jerjen, H. +3 more
We have used the Advanced Camera for Surveys and Wide Field Camera 3 cameras on board the Hubble Space Telescope to resolve stars in the halo of the nearest giant elliptical (gE) galaxy NGC 5128 out to a projected distance of 140 kpc (25 effective radii, R eff) along the major axis and 90 kpc (16 R eff) along the minor axis. …
Expectations for the Hard X-Ray Continuum and Gamma-Ray Line Fluxes from the Type Ia Supernova SN 2014J in M82
Burrows, Adam; The, Lih-Sin
The hard X-ray continuum and gamma-ray lines from a Type Ia supernova dominate its integrated photon emissions and can provide unique diagnostics of the mass of the ejecta, the 56Ni yield and spatial distribution, its kinetic energy and expansion speed, and the mechanism of explosion. Such signatures and their time behavior "X-ray" the …
HZ Her: Stellar Radius from X-Ray Eclipse Observations, Evolutionary State, and a New Distance
Leahy, D. A.; Abdallah, M. H.
Observations of HZ Her/Her X-1 by the Rossi X-Ray Timing Explorer (RXTE) covering high state eclipses of the neutron star are analyzed here. Models of the eclipse are used to measure the radius and atmospheric scale height of HZ Her, the stellar companion to the neutron star. The radius is 2.58-3.01 × 1011 cm, depending on system inclin…
Properties of Submillimeter Galaxies in the CANDELS GOODS-South Field
Barro, Guillermo; Castellano, Marco; Ferguson, Henry C. +29 more
We derive physical properties of 10 submillimeter galaxies located in the CANDELS coverage of the GOODS-S field. The galaxies were first identified as submillimeter sources with the LABOCA bolometer and subsequently targeted for 870 µm continuum observation with ALMA. The high angular resolution of the ALMA imaging allows secure counterparts…
New Clues to the Cause of Extended Main-Sequence Turnoffs in Intermediate-age Star Clusters in the Magellanic Clouds
Goudfrooij, Paul; Puzia, Thomas H.; Correnti, Matteo +3 more
We use the Wide Field Camera 3 on board the Hubble Space Telescope (HST) to obtain deep, high-resolution images of two intermediate-age star clusters in the Large Magellanic Cloud of relatively low mass (≈104 M ⊙) and significantly different core radii, namely NGC 2209 and NGC 2249. For comparison purposes, we also reanalyzed…
Hubble Space Telescope Observations of the Afterglow, Supernova, and Host Galaxy Associated with the Extremely Bright GRB 130427A
Cenko, S. B.; Pian, E.; Kouveliotou, C. +13 more
We present Hubble Space Telescope (HST) observations of the exceptionally bright and luminous Swift gamma-ray burst (GRB), GRB 130427A. At z = 0.34, this burst affords an excellent opportunity to study the supernova (SN) and host galaxy associated with an intrinsically extremely luminous burst (E iso > 1054 erg): more lumi…
An Estimate of the Magnetic Field Strength Associated with a Solar Coronal Mass Ejection from Low Frequency Radio Observations
Ramesh, R.; Kathiravan, C.; Wang, T. J. +2 more
We report ground based, low frequency heliograph (80 MHz), spectral (85-35 MHz), and polarimeter (80 and 40 MHz) observations of drifting, non-thermal radio continuum associated with the "halo" coronal mass ejection that occurred in the solar atmosphere on 2013 March 15. The magnetic field strengths (B) near the radio source were estimated to be B…
Chandra and XMM-Newton Study of the Supernova Remnant Kes 73 Hosting the Magnetar 1E 1841-045
Safi-Harb, Samar; Gotthelf, E. V.; Slane, Patrick O. +1 more
We present a Chandra and XMM-Newton study of the supernova remnant (SNR) Kes 73 hosting the anomalous X-ray pulsar 1E 1841-045. The Chandra image reveals clumpy structures across the remnant with enhanced emission along the western rim. The X-ray emission fills the radio shell and spatially correlates with the infrared image. The global X-ray spec…
The State of the Warm and Cold Gas in the Extreme Starburst at the Core of the Phoenix Galaxy Cluster (SPT-CLJ2344-4243)
McNamara, Brian R.; Wilner, David J.; Veilleux, Sylvain +9 more
We present new optical integral field spectroscopy (Gemini South) and submillimeter spectroscopy (Submillimeter Array) of the central galaxy in the Phoenix cluster (SPT-CLJ2344-4243). This cluster was previously reported to have a massive starburst (~800 M ⊙ yr-1) in the central, brightest cluster galaxy, most likely fueled b…
The Orbital Motion of the Quintuplet Cluster—A Common Origin for the Arches and Quintuplet Clusters?
Ghez, A. M.; Brandner, W.; Lu, J. R. +6 more
We investigate the orbital motion of the Quintuplet cluster near the Galactic center with the aim of constraining formation scenarios of young, massive star clusters in nuclear environments. Three epochs of adaptive optics high-angular resolution imaging with the Keck/NIRC2 and Very Large Telescope/NAOS-CONICA systems were obtained over a time bas…