Search Publications
Cross-correlation between X-Ray and Optical/Near-infrared Background Intensity Fluctuations
Luo, Bin; Xue, Yongquan; Koekemoer, Anton +3 more
Angular power spectra of optical and infrared background anisotropies at wavelengths between 0.5 and 5 µm are a useful probe of faint sources present during reionization, in addition to faint galaxies and diffuse signals at low redshift. The cross-correlation of these fluctuations with backgrounds at other wavelengths can be used to separate…
Discovery of Molecular Hydrogen in SN 1987A
Fransson, Claes; Leibundgut, Bruno; Spyromilio, Jason +3 more
Both CO and SiO have been observed at early and late phases in SN 1987A. H2 was predicted to form at roughly the same time as these molecules, but was not detected at early epochs. Here, we report the detection of NIR lines from H2 at 2.12 and 2.40 µ {{m}} in VLT/SINFONI spectra obtained between days 6489 and 10,120. Th…
Measurement of the Integrated Sachs-Wolfe Effect Using the AllWISE Data Release
Wright, Edward L.; Shajib, Anowar J.
One of the physical features of a dark-energy-dominated universe is the integrated Sachs-Wolfe (ISW) effect on the cosmic microwave background (CMB) radiation, which gives us a direct observational window to detect and study dark energy. The AllWISE data release of the Wide-field Infrared Survey Explorer (WISE) has a large number of point sources …
Properties and Modeling of Unresolved Fine Structure Loops Observed in the Solar Transition Region by IRIS
Warren, Harry P.; Brooks, David H.; Reep, Jeffrey W.
Recent observations from the Interface Region Imaging Spectrograph (IRIS) have discovered a new class of numerous low-lying dynamic loop structures, and it has been argued that they are the long-postulated unresolved fine structures (UFSs) that dominate the emission of the solar transition region. In this letter, we combine IRIS measurements of th…
Concurrent Formation of Carbon and Silicate Dust in Nova V1280 Sco
Onaka, Takashi; Usui, Fumihiko; Koo, Bon-Chul +12 more
We present infrared multi-epoch observations of the dust-forming nova V1280 Sco over ∼2000 days from the outburst. The temporal evolution of the infrared spectral energy distributions at 1272, 1616, and 1947 days can be explained by the emissions produced by amorphous carbon dust of mass (6.6-8.7) × 10-8 M⊙ with a representat…
The Molecular Clouds Fueling A 1/5 Solar Metallicity Starburst
Leroy, Adam K.; Johnson, Kelsey E.; Sandstrom, Karin +2 more
Using the Atacama Large Millimeter/submillimeter Array, we have made the first high spatial and spectral resolution observations of the molecular gas and dust in the prototypical blue compact dwarf galaxy II Zw 40. The {}12{CO}(2-1) and {}12{CO}(3-2) emission is clumpy and distributed throughout the central star-forming regio…
Hinode and IRIS Observations of the Magnetohydrodynamic Waves Propagating from the Photosphere to the Chromosphere in a Sunspot
Shimizu, Toshifumi; Imada, Shinsuke; Kanoh, Ryuichi
Magnetohydrodynamic (MHD) waves have been considered as energy sources for heating the solar chromosphere and the corona. Although MHD waves have been observed in the solar atmosphere, there are a lack of quantitative estimates on the energy transfer and dissipation in the atmosphere. We performed simultaneous Hinode and Interface Region Imaging S…
Determination of Coronal Mass Ejection Physical Parameters from a Combination of Polarized Visible Light and UV Lyα Observations
Bemporad, A.; Susino, R.
Visible-light observations of Coronal Mass Ejections (CMEs) performed with coronagraphs and heliospheric imagers (in primis on board the Solar and Heliospheric Observatory and STEREO missions) have offered the best way to study the kinematics and geometrical structure of these fundamental events so far. Nevertheless, it has been widely demonstrate…
Differences in the Structural Properties and Star-formation Rates of Field and Cluster Galaxies at z~1
Allen, Rebecca J.; Kacprzak, Glenn G.; Glazebrook, Karl +5 more
We investigate the dependence of galaxy sizes and star formation rates (SFRs) on their environment using a mass-limited sample of quiescent and star-forming galaxies with log(M */{M}⊙ ) ≥ 9.5 at \bar{z}=0.92 selected from the NEWFIRM medium-band Survey (NMBS). Using the Galaxy Environment Evolution Collaboration 2 spectroscop…
On the Spin of the Black Hole in IC 10 X-1
Steiner, James F.; McClintock, Jeffrey E.; Middleton, Matthew J. +5 more
The compact X-ray source in the eclipsing X-ray binary IC 10 X-1 has reigned for years as ostensibly the most massive stellar-mass black hole, with a mass estimated to be about twice that of its closest rival. However, striking results presented recently by Laycock et al. reveal that the mass estimate, based on emission-line velocities, is unrelia…