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- Columbia UniversityUS5 papers
- National Institute for AstrophysicsIT4 papers
- Space Telescope Science InstituteUS4 papers
- Yale UniversityUS4 papers
- Brera Astronomical ObservatoryIT3 papers
- California Institute of TechnologyUS3 papers
- DePaul UniversityUS3 papers
- Goddard Space Flight CenterUS3 papers
- Lawrence Livermore National LaboratoryUS3 papers
- The University of Texas at AustinUS3 papers
- University of California, BerkeleyUS3 papers
- University of California, Santa CruzUS3 papers
5 papers · 1 filter
A Time Resolved Study of the Broad Line Region in Blazar 3C 454.3
Jedidah C. Isler, C. Megan Urry, Paolo Coppi +6
We present multi-epoch optical observations of the blazar 3C 454.3 (z = 0.859) from 2008 August through 2011 December, using the SMARTS Consortium 1.5m+RCSpectrograph and 1.3m+ANDI…
A Captured Runaway Black Hole in NGC 1277?
G. A. Shields, E. W. Bonning
Recent results indicate that the compact lenticular galaxy NGC 1277 in the Perseus Cluster contains a black hole of approximately 10 billion solar masses. This far exceeds the expe…
Accretion Disk Temperatures of QSOs: Constraints from the Emission Lines
E. W. Bonning, G. A. Shields, A. C. Stevens +1
QSO emission-line spectra are compared to predictions based on theoretical ionizing continua of accretion disks. Observed line intensities do not show the expected trend of higher…
Precision Measurement of The Most Distant Spectroscopically Confirmed Supernova Ia with the Hubble Space Telescope
D. Rubin, R. A. Knop, E. Rykoff +25
We report the discovery of a redshift 1.71 supernova in the GOODS North field. The Hubble Space Telescope (HST) ACS spectrum has almost negligible contamination from the host or ne…
A Comparison of X-ray and Mid-Infrared Selection of Obscured AGN
Megan E. Eckart, Ian D. McGreer, Daniel Stern +2
We compare the relative merits of AGN selection at X-ray and mid-infrared wavelengths using data from moderately deep fields observed by both Chandra and Spitzer. The X-ray-selecte…