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The Host Galaxy and Central Engine of the Dwarf Active Galactic Nucleus POX 52
Ho, Luis C.; Thornton, Carol E.; Barth, Aaron J. +2 more
We present new multiwavelength observations of the dwarf Seyfert 1 galaxy POX 52 in order to investigate the properties of the host galaxy and the active nucleus and to examine the mass of its black hole, previously estimated to be ~105 M⊙. HST ACS HRC images show that the host galaxy has a dwarf elliptical morphology (M…
Simultaneous Multiwavelength Observations of the Blazar 1ES 1959+650 at a Low TeV Flux
Maraschi, L.; Tagliaferri, G.; Ghisellini, G. +144 more
We present the results from a multiwavelength campaign on the TeV blazar 1ES 1959+650, performed in 2006 May. Data from the optical, UV, soft- and hard-X-ray, and very high energy (VHE) gamma-ray (E > 100 GeV) bands were obtained with the Suzaku and Swift satellites, the MAGIC telescope, and other ground-based facilities. The source spectral en…
The Rotating Nuclear Star Cluster in NGC 4244
Caldwell, Nelson; Seth, Anil C.; Debattista, Victor P. +2 more
We present observations of the nuclear star cluster in the nearby edge-on spiral galaxy NGC 4244 using the Gemini Near-Infrared Integral Field Spectrograph (NIFS) with laser guide star adaptive optics. From a previous study of edge-on galaxies, this nuclear star cluster was found to be one of a sample of clusters that appear flattened along the pl…
Spitzer/MIPS 24 µm Observations of Galaxy Clusters: An Increasing Fraction of Obscured Star-forming Members from z = 0.02 to z = 0.83
Saintonge, Amélie; Tran, Kim-Vy H.; Holden, Bradford P.
We study the mid-infrared properties of 1315 spectroscopically confirmed members in eight massive (Mvirgtrsim 5 × 1014 M⊙) galaxy clusters covering the redshift range from 0.02 to 0.83. The selected clusters all have deep Spitzer/MIPS 24 µm observations, Hubble and ground-based photometry, and extensive redsh…
Do All Flares Have White-Light Emission?
Mathioudakis, M.; Keenan, F. P.; Jess, D. B. +1 more
High-cadence, multiwavelength optical observations of a solar active region (NOAA AR 10969), obtained with the Swedish Solar Telescope, are presented. Difference imaging of white light continuum data reveals a white-light brightening, 2 minutes in duration, linked to a cotemporal and cospatial C2.0 flare event. The flare kernel observed in the whi…
Proplyds and Massive Disks in the Orion Nebula Cluster Imaged with CARMA and SMA
Carpenter, John M.; Wilner, D.; Eisner, J. A. +3 more
We imaged a 2' × 2' region of the Orion Nebula Cluster (ONC) in 1.3 mm wavelength continuum emission with the recently commissioned Combined Array for Research in Millimeter Astronomy (CARMA) and with the Submillimeter Array (SMA). Our mosaics include >250 known near-IR cluster members, of which 36 are so-called ``proplyds…
The Persistence of Memory, or How the X-Ray Spectrum of SNR 0509-67.5 Reveals the Brightness of Its Parent Type Ia Supernova
Hughes, John P.; Badenes, Carles; Bravo, Eduardo +1 more
We examine the dynamics and X-ray spectrum of the young Type Ia supernova remnant 0509-67.5 in the context of the recent results obtained from the optical spectroscopy of its light echo. Our goal is to estimate the kinetic energy of the supernova explosion using Chandra and XMM-Newton observations of the supernova remnant, thus placing the birth e…
Early Formation of Dust in the Ejecta of Type Ib SN 2006jc and Temperature and Mass of the Dust
Onaka, Takashi; Sakon, Itsuki; Tominaga, Nozomu +8 more
SN 2006jc is a peculiar supernova (SN), in which the formation of dust has been confirmed at an early epoch of ~50 days after the explosion. We investigate the possibility of such an early formation of dust grains in the expanding ejecta of SN 2006jc, applying the Type Ib SN model that is developed to reproduce the observed light curve. We find th…
Starburst Intensity Limit of Galaxies at z simeq 5-6
Hathi, N. P.; Malhotra, S.; Rhoads, J. E.
The peak star formation intensity in starburst galaxies does not vary significantly from the local universe to redshift z ~ 6. We arrive at this conclusion through new surface brightness measurements of 47 starburst galaxies at z simeq 5-6, doubling the redshift range for such observations. These galaxies are spectroscopically confirmed in the Hub…
T Tauri Jet Physics Resolved Near the Launching Region with the Hubble Space Telescope
Bacciotti, Francesca; Coffey, Deirdre; Podio, Linda
We present an analysis of the gas physics at the base of jets from five T Tauri stars based on high angular resolution optical spectra, using the Hubble Space Telescope Imaging Spectrograph (HST STIS). The spectra refer to a region within 100 AU of the star, i.e., where the collimation of the jet has just taken place. We form position-velocity (PV…