Search Publications
Hubble Space Telescope Imaging of the Expanding Nebular Remnant of the 2006 Outburst of the Recurrent Nova RS Ophiuchi
Bond, Howard E.; Eyres, S. P. S.; Evans, A. +5 more
We report Hubble Space Telescope imaging obtained 155 days after the 2006 outburst of RS Ophiuchi. We detect extended emission in both [O III] λ5007 and [Ne V] λ3426 lines. In both lines, the remnant has a double ring structure. The east-west orientation and total extent of these structures (580+/-50 AU at d=1.6 kpc) is consistent with that expect…
Direct Observation of High-Speed Plasma Outflows Produced by Magnetic Reconnection in Solar Impulsive Events
Qiu, Jiong; Wang, Tongjiang; Sui, Linhui
Spectroscopic observations of a solar limb flare recorded by SUMER on SOHO reveal for the first time hot, fast magnetic reconnection outflows in the corona. As the reconnection site rises across the SUMER spectrometer slit, significant blue- and redshift signatures are observed in sequence in the Fe XIX line, reflecting upflows and downflows of ho…
MAGIC Upper Limits on the Very High Energy Emission from Gamma-Ray Bursts
Bastieri, D.; Ciprini, S.; Longo, F. +141 more
During its first data cycle, between 2005 and the beginning of 2006, the fast repositioning system of the MAGIC telescope allowed the observation of nine different gamma-ray bursts as possible sources of very high energy γ-rays. These observations were triggered by alerts from Swift, HETE-2, and INTEGRAL; they started as quickly as possible after …
An Increase in the Faint Red Galaxy Population in Massive Clusters since z ~ 0.5
Kneib, J. -P.; Smith, G. P.; Smail, Ian +4 more
We compare the luminosity functions for red galaxies lying on the rest-frame (U-V) color-magnitude sequence in a homogeneous sample of 10 X-ray-luminous clusters from the MACS survey at z~0.5 to a similarly selected X-ray cluster sample at z~0.1. We exploit deep Hubble Space Telescope ACS imaging in the F555W and F814W passbands of the central 1.2…
Mapping Extremely Low Metallicity Galaxies to Redshift One
Cowie, Lennox L.; Hu, Esther M.; Kakazu, Yuko
We describe the results of a narrowband search for ultrastrong emission line galaxies (USELs) with EW(Hβ)>=30 Å. A total of 542 candidate galaxies are found in a one-half square degree survey using two ~120 Å filters centered at 8150 and 9140 Å with Subaru SuprimeCam. Follow-up spectroscopy for randomly selected objects in the candidate sample …
Long-Term Evolution of Massive Black Hole Binaries. III. Binary Evolution in Collisional Nuclei
Merritt, David; Mikkola, Seppo; Szell, Andras
In galactic nuclei with sufficiently short relaxation times, binary supermassive black holes can evolve beyond their stalling radii via continued interaction with stars. We study this ``collisional'' evolutionary regime using both fully self-consistent N-body integrations and approximate Fokker-Planck models. The N-body integrations employ particl…
A Very Bright, Highly Magnified Lyman Break Galaxy at z = 3.07
Kneib, J. -P.; Smith, G. P.; Smail, Ian +8 more
Using Hubble Space Telescope imaging and Keck spectroscopy, we report the discovery of a very bright, highly magnified (~30 times) Lyman break galaxy (LBG) at z=3.07 in the field of the massive z=0.33 cluster MACS J2135.2-0102. The system comprises two high surface brightness arcs with a maximum extent of 3", bracketing a central object that we id…
Cassini States with Dissipation: Why Obliquity Tides Cannot Inflate Hot Jupiters
Fabrycky, Daniel C.; Johnson, Eric T.; Goodman, Jeremy
Some short-period exoplanets (``hot Jupiters'') are observed by their transits to have anomalously large radii. It has been suggested that these planets are in a resonance involving persistent misalignment and synchronous precession of their spin and orbital angular momenta (a Cassini state) and that the attendant tidal heating inflates the planet…
Collimation, Proper Motions, and Physical Conditions in the HH 30 Jet from Hubble Space Telescope Slitless Spectroscopy
Hartigan, Patrick; Morse, Jon
We present STIS spectral images of the HH 30 stellar jet taken through a wide slit over two epochs. The jet is unresolved spectrally, so the observations produce emission-line images for each line in the spectrum. This rich data set shows how physical conditions in the jet vary with distance and time, produces precise proper motions of knots withi…
A Detailed Study of Gas and Star Formation in a Highly Magnified Lyman Break Galaxy at z = 3.07
Kneib, J. -P.; Smail, Ian; Dye, S. +10 more
We report the detection of CO(3-2) emission from a bright, gravitationally lensed Lyman Break galaxy, LBG J213512.73-010143 (the ``Cosmic Eye''), at z=3.07, using the Plateau de Bure Interferometer. This is only the second detection of molecular gas emission from an LBG and yields an intrinsic molecular gas mass of (2.4+/-0.4)×109 M