Search Publications
The SL2S Galaxy-scale Gravitational Lens Sample. I. The Alignment of Mass and Light in Massive Early-type Galaxies at z = 0.2-0.9
Treu, Tommaso; Gavazzi, Raphaël; Marshall, Philip J. +2 more
We study the relative alignment of mass and light in a sample of 16 massive early-type galaxies at z = 0.2-0.9 that act as strong gravitational lenses. The sample was identified from deep multi-band images obtained as part of the Canada-France-Hawaii Telescope Legacy Survey and as part of the Strong Lensing Legacy Survey (SL2S). Higher resolution …
The Relation between Cool Cluster Cores and Herschel-detected Star Formation in Brightest Cluster Galaxies
Smith, G. P.; Altieri, B.; Valtchanov, I. +12 more
We present far-infrared (FIR) analysis of 68 brightest cluster galaxies (BCGs) at 0.08 < z < 1.0. Deriving total infrared luminosities directly from Spitzer and Herschel photometry spanning the peak of the dust component (24-500 µm), we calculate the obscured star formation rate (SFR). 22+6.2 -5.3% of the BCGs are…
Supergranules as Probes of the Sun's Meridional Circulation
Hathaway, David H.
Recent analysis revealed that supergranules (convection cells seen at the Sun's surface) are advected by the zonal flows at depths equal to the widths of the cells themselves. Here we probe the structure of the meridional circulation by cross-correlating maps of the Doppler velocity signal using a series of successively longer time lags between ma…
On the Nature of the Solar Wind from Coronal Pseudostreamers
Sheeley, N. R., Jr.; Wang, Y. -M.; Robbrecht, E. +1 more
Coronal pseudostreamers, which separate like-polarity coronal holes, do not have current sheet extensions, unlike the familiar helmet streamers that separate opposite-polarity holes. Both types of streamers taper into narrow plasma sheets that are maintained by continual interchange reconnection with the adjacent open magnetic field lines. White-l…
Submillimeter Line Spectrum of the Seyfert Galaxy NGC 1068 from the Herschel-SPIRE Fourier Transform Spectrometer
Wilson, Christine D.; Bendo, George J.; Madden, Suzanne C. +13 more
The first complete submillimeter spectrum (190-670 µm) of the Seyfert 2 galaxy NGC 1068 has been observed with the SPIRE Fourier transform spectrometer on board the Herschel Space Observatory. The sequence of CO lines (J up = 4-13), lines from H2O, the fundamental rotational transition of hydrogen fluoride, two o-H…
A Monte Carlo Markov Chain Based Investigation of Black Hole Spin in the Active Galaxy NGC 3783
Fabian, Andrew C.; Brenneman, Laura W.; Reynolds, Christopher S. +4 more
The analysis of relativistically broadened X-ray spectral features from the inner accretion disk provides a powerful tool for measuring the spin of supermassive black holes in active galactic nuclei (AGNs). However, AGN spectra are often complex and careful analysis employing appropriate and self-consistent models is required if one has to obtain …
Overdensities of Y-dropout Galaxies from the Brightest-of-Reionizing Galaxies Survey: A Candidate Protocluster at Redshift z ≈ 8
Shull, J. M.; Treu, T.; Carollo, C. M. +8 more
Theoretical and numerical modeling of the assembly of dark-matter halos predicts that the most massive and luminous galaxies at high redshift are surrounded by overdensities of fainter companions. We test this prediction with Hubble Space Telescope observations acquired by our Brightest-of-Reionizing Galaxies (BoRG) survey, which identified four v…
A Double Cluster at the Core of 30 Doradus
Panagia, N.; Anderson, J.; Lennon, D. J. +7 more
Based on an analysis of data obtained with the Wide Field Camera 3 on the Hubble Space Telescope we report the identification of two distinct stellar populations in the core of the giant H II region 30 Doradus in the Large Magellanic Cloud. The most compact and richest component coincides with the center of R136 and is ~1 Myr younger than a second…
Detection of Elements at All Three r-process Peaks in the Metal-poor Star HD 160617
Roederer, Ian U.; Lawler, James E.
We report the first detection of elements at all three r-process peaks in the metal-poor halo star HD 160617. These elements include arsenic and selenium, which have not been detected previously in halo stars, and the elements tellurium, osmium, iridium, and platinum, which have been detected previously. Absorption lines of these elements are foun…
Herschel-ATLAS: Toward a Sample of ~1000 Strongly Lensed Galaxies
Rodighiero, G.; Frayer, D. T.; Sutherland, W. +39 more
While the selection of strongly lensed galaxies (SLGs) with 500 µm flux density S 500 > 100 mJy has proven to be rather straightforward, for many applications it is important to analyze samples larger than the ones obtained when confining ourselves to such a bright limit. Moreover, only by probing to fainter flux densities is i…