Search Publications
Constraining the Spin of the Black Hole in Fairall 9 with Suzaku
Fabian, A. C.; Miller, J. M.; Reynolds, C. S. +6 more
We report on the results of spectral fits made to data obtained from a 168 ks Suzaku observation of the Seyfert 1 galaxy Fairall 9. The source is clearly detected out to 30 keV. The observed spectrum is fairly simple; it is well described by a power law with soft excess and disk reflection. A broad iron line is detected, and easily separated from …
Far-Ultraviolet H2 Emission from Circumstellar Disks
Pascucci, Ilaria; Carpenter, John; Hartmann, Lee +15 more
We analyze the far-ultraviolet (FUV) spectra of 33 classical T Tauri stars (CTTS), including 20 new spectra obtained with the Advanced Camera for Surveys Solar Blind Channel (ACS/SBC) on the Hubble Space Telescope. Of the sources, 28 are in the ~1 Myr old Taurus-Auriga complex or Orion Molecular Cloud, 4 in the 8-10 Myr old Orion OB1a complex, and…
Interstellar Medium Sculpting of the HD 32297 Debris Disk
Weinberger, Alycia J.; Debes, John H.; Kuchner, Marc J.
We detect the HD 32297 debris disk in scattered light at 1.6 and 2.05 µm. We use these new observations together with a previous scattered light image of the disk at 1.1 µm to examine the structure and scattering efficiency of the disk as a function of wavelength. In addition to surface brightness asymmetries and a warped morphology be…
Ion Temperatures in the Low Solar Corona: Polar Coronal Holes at Solar Minimum
Cranmer, S. R.; Landi, E.
In the present work we use a deep-exposure spectrum taken by the SUMER spectrometer in a polar coronal hole in 1996 to measure the ion temperatures of a large number of ions at many different heights above the limb between 0.03 and 0.17 solar radii. We find that the measured ion temperatures are almost always larger than the electron temperatures …
Spitzer Observations of the Young Core-Collapse Supernova Remnant 1E0102-72.3: Infrared Ejecta Emission and Dust Formation
Reach, W. T.; Rho, J.; Dunne, L. +4 more
We present Spitzer Infrared Spectrograph and Infrared Array Camera observations of the young supernova remnant E0102 (SNR 1E0102-7219) in the Small Magellanic Cloud. The infrared spectra show strong lines of Ne and O, with the [Ne II] line at 12.8 µm having a large velocity dispersion of 2000-4500 km s-1 indicative of fast-moving …
The High-Mass End of the Black Hole Mass Function: Mass Estimates in Brightest Cluster Galaxies
Ferrarese, L.; Beifiori, A.; Dalla Bontà, E. +5 more
We present Hubble Space Telescope imaging and spectroscopic observations of three Brightest Cluster Galaxies, Abell 1836-BCG, Abell 2052-BCG, and Abell 3565-BCG, obtained with the Wide Field and Planetary Camera 2, the Advanced Camera for Surveys and the Space Telescope Imaging Spectrograph. The data provide detailed information on the structure a…
Isotropic Mid-Infrared Emission from the Central 100 pc of Active Galaxies
Telesco, C. M.; Packham, C.; Levenson, N. A. +3 more
Dust reprocesses the intrinsic radiation of active galactic nuclei (AGNs) to emerge at longer wavelengths. The observed mid-infrared (MIR) luminosity depends fundamentally on the luminosity of the central engine, but in detail it also depends on the geometric distribution of the surrounding dust. To quantify this relationship, we observe nearby no…
Near-Infrared Transit Photometry of the Exoplanet HD 149026b
Winn, Joshua N.; Holman, Matthew J.; Gilliland, Ronald +1 more
The transiting exoplanet HD 149026b is an important case for theories of planet formation and planetary structure, for the planet's relatively small size has been interpreted as evidence for a highly metal-enriched composition. We present observations of four transits with the Near-Infrared Camera and Multi-Object Spectrometer (NICMOS) on the Hubb…
The High-Energy Emission of the Crab Nebula from 20 keV TO 6 MeV with Integral SPI
Jourdain, E.; Roques, J. P.
The SPI spectrometer aboard the International Gamma-Ray Astrophysics Laboratory mission regularly observes the Crab Nebula since 2003. We report on observations distributed over 5.5 years and investigate the variability of the intensity and spectral shape of this remarkable source in the hard X-rays domain up to a few MeV. While single power-law m…
Sunyaev-Zel'Dovich Effect Observations of the Bullet Cluster (1E 0657-56) with APEX-SZ
Kneissl, R.; Menten, K. M.; Ade, P. A. R. +33 more
We present observations of the Sunyaev-Zel'dovich effect (SZE) in the Bullet cluster (1E 0657-56) using the APEX-SZ instrument at 150 GHz with a resolution of 1'. The main results are maps of the SZE in this massive, merging galaxy cluster. The cluster is detected with 23σ significance within the central 1' radius of the source position. The SZE m…