Search Publications
Hubble Space Telescope Imaging of Lyα Emission at z ≈ 4.4
Finkelstein, Steven L.; Grogin, Norman A.; Hathi, Nimish P. +28 more
We present the highest redshift detections of resolved Lyα emission, using Hubble Space Telescope (HST)/Advanced Camera for Surveys F658N narrowband-imaging data taken in parallel with the Wide Field Camera 3 Early Release Science program in the GOODS Chandra Deep Field-South. We detect Lyα emission from three spectroscopically confirmed z = 4.4 L…
Different Patterns of Chromospheric Evaporation in a Flaring Region Observed with Hinode/EIS
Ding, M. D.; Li, Y.
We investigate the chromospheric evaporation in the flare of 2007 January 16 using line profiles observed by the Exterme-UV Imaging Spectrometer on board Hinode. Three points at flare ribbons of different magnetic polarities are analyzed in detail. We find that the three points show different patterns of upflows and downflows in the impulsive phas…
The Solar Energetic Balance Revisited by Young Solar Analogs, Helioseismology, and Neutrinos
Turck-Chièze, Sylvaine; Couvidat, Sébastien; Piau, Laurent
The energetic balance of the standard solar model (SSM) results from equilibrium between nuclear energy production, energy transfer, and photospheric emission. In this Letter, we give an order of magnitude of several percent for the loss of energy in kinetic energy, magnetic energy, and X-ray or UV radiation during the entire solar lifetime from t…
Sympathetic Filament Eruptions Connected by Coronal Dimmings
Yang, Jiayan; Bi, Yi; Hong, Junchao +2 more
We present for the first time detailed observations of three successive, interdependent filament eruptions that occurred one by one within 5 hr from different locations beyond the range of a single active region. The first eruption was observed from an active region and was associated with a coronal mass ejection (CME), during which diffuse and co…
Galaxy Clusters at High Redshift and Evolution of Brightest Cluster Galaxies
Han, J. L.; Wen, Z. L.
Identification of high-redshift clusters is important for studies of cosmology and cluster evolution. Using photometric redshifts of galaxies, we identify 631 clusters from the Canada-France-Hawaii Telescope (CFHT) wide field, 202 clusters from the CFHT deep field, 187 clusters from the Cosmic Evolution Survey (COSMOS) field, and 737 clusters from…
Herschel/HIFI Observations of Hydrogen Fluoride Toward Sagittarius B2(M)
Lis, D. C.; Bergin, E. A.; Phillips, T. G. +6 more
Herschel/HIFI observations have revealed the presence of widespread absorption by hydrogen fluoride (HF) J = 1-0 rotational transition, toward a number of Galactic sources. We present observations of HF J = 1-0 toward the high-mass star-forming region Sagittarius B2(M). The spectrum obtained shows a complex pattern of absorption, with numerous fea…
Ejecta Knot Flickering, Mass Ablation, and Fragmentation in Cassiopeia A
Shull, J. Michael; Fesen, Robert A.; Hammell, Molly C. +2 more
Ejecta knot flickering, ablation tails, and fragmentation are expected signatures associated with the gradual dissolution of high-velocity supernova (SN) ejecta caused by their passage through an inhomogeneous circumstellar medium or interstellar medium (ISM). Such phenomena mark the initial stages of the gradual merger of SN ejecta with and the e…
PTF 10bzf (SN 2010ah): A Broad-line Ic Supernova Discovered by the Palomar Transient Factory
Cenko, S. B.; Mitrofanov, I.; Bloom, J. S. +26 more
We present the discovery and follow-up observations of a broad-line Type Ic supernova (SN), PTF 10bzf (SN 2010ah), detected by the Palomar Transient Factory (PTF) on 2010 February 23. The SN distance is cong218 Mpc, greater than GRB 980425/SN 1998bw and GRB 060218/SN 2006aj, but smaller than the other SNe firmly associated with gamma-ray bursts (G…
The Extremely Red Host Galaxy of GRB 080207
Cresci, Giovanni; Savaglio, Sandra; Pian, Elena +5 more
We present optical, near-infrared, and Spitzer IRAC and MIPS observations of the host galaxy of the dark Swift gamma-ray burst GRB 080207. The host is faint, with extremely red optical-infrared colors (R - K = 6.3, 24 µm/R-band flux ~1000) making it an extremely red object (ERO) and a dust-obscured galaxy (DOG). The spectral energy distribut…
The Young Binary DQ Tau: A Hunt for X-ray Emission from Colliding Magnetospheres
Garmire, Gordon P.; Broos, Patrick S.; Getman, Konstantin V. +2 more
The young high-eccentricity binary DQ Tau exhibits powerful recurring millimeter-band (mm) flaring attributed to collisions between the two stellar magnetospheres near periastron, when the stars are separated by only ~8 R sstarf. These magnetospheric interactions are expected to have scales and magnetic field strengths comparable to tho…