Search Publications
The Assembly History of Disk Galaxies. II. Probing the Emerging Tully-Fisher Relation during 1 < z < 1.7
Treu, Tommaso; Ellis, Richard S.; Newman, Andrew B. +3 more
Through extended integrations using the recently installed deep depletion CCD on the red arm of the Keck I Low Resolution Imaging Spectrograph, we present new measurements of the resolved spectra of 70 morphologically selected star-forming galaxies with i AB < 24.1 in the redshift range 1 <~ z < 1.7. Using the formalism introdu…
IDCS J1426.5+3508: Sunyaev-Zel'dovich Measurement of a Massive Infrared-selected Cluster at z = 1.75
Stern, D.; Carlstrom, J. E.; Leitch, E. M. +14 more
We report 31 GHz CARMA observations of IDCS J1426.5+3508, an infrared-selected galaxy cluster at z = 1.75. A Sunyaev-Zel'dovich (SZ) decrement is detected toward this cluster, indicating a total mass of M 200, m = (4.3 ± 1.1) × 1014 M ⊙ in agreement with the approximate X-ray mass of ~5 × 1014 M ⊙<…
Comet C/2011 W3 (Lovejoy): Orbit Determination, Outbursts, Disintegration of Nucleus, Dust-tail Morphology, and Relationship to New Cluster of Bright Sungrazers
Sekanina, Zdenek; Chodas, Paul W.
We describe the physical and orbital properties of C/2011 W3. After surviving perihelion passage, the comet was observed to undergo major physical changes. The permanent loss of the nuclear condensation and the formation of a narrow spine tail were observed first at Malargue, Argentina, on December 20 and then systematically at Siding Spring, Aust…
The Black Hole Spin and Soft X-Ray Excess of the Luminous Seyfert Galaxy Fairall 9
Fabian, Andrew C.; Brenneman, Laura W.; Reynolds, Christopher S. +4 more
We present an analysis of all XMM-Newton and Suzaku X-ray spectra of the nearby luminous Seyfert galaxy Fairall 9. Confirming previous analyses, we find robust evidence for a broad iron line associated with X-ray reflection from the innermost accretion disk. By fitting a spectral model that includes a relativistically ionized reflection component,…
Initiation of Coronal Mass Ejection and Associated Flare Caused by Helical Kink Instability Observed by SDO/AIA
Cho, K. -S.; Park, Sung-Hong; Kumar, Pankaj +2 more
In this paper, we present multiwavelength observations of helical kink instability as a trigger of a coronal mass ejection (CME) which occurred in active region NOAA 11163 on 2011 February 24. The CME was associated with an M3.5 limb flare. High-resolution observations from the Solar Dynamics Observatory/Atmospheric Imaging Assembly suggest the de…
Multiple Plasma Ejections and Intermittent Nature of Magnetic Reconnection in Solar Chromospheric Anemone Jets
Shibata, K.; Isobe, H.; Singh, K. A. P. +2 more
The recent discovery of chromospheric anemone jets with the Solar Optical Telescope (SOT) on board Hinode has shown an indirect evidence of magnetic reconnection in the solar chromosphere. However, the basic nature of magnetic reconnection in chromosphere is still unclear. We studied nine chromospheric anemone jets from SOT/Hinode using Ca II H fi…
Probing the Role of Carbon in Ultraviolet Extinction along Galactic Sight Lines
Murthy, J.; Babu, B. R. S.; Parvathi, V. S. +1 more
We report previously undetermined interstellar gas and dust-phase carbon abundances along 15 Galactic sight lines based on archival data of the strong 1334.5323 Å transition observed with the Space Telescope Imaging Spectrograph. These are combined with previously reported carbon measurements along six sight lines to produce a complete sample of i…
Variability-selected Low-luminosity Active Galactic Nuclei in the 4 Ms Chandra Deep Field-South
Lehmer, B. D.; Alexander, D. M.; Bauer, F. E. +8 more
The 4 Ms Chandra Deep Field-South (CDF-S) and other deep X-ray surveys have been highly effective at selecting active galactic nuclei (AGNs). However, cosmologically distant low-luminosity AGNs (LLAGNs) have remained a challenge to identify due to significant contribution from the host galaxy. We identify long-term X-ray variability (~month-years,…
Defining the "Blind Spot" of Hinode EIS and XRT Temperature Measurements
Golub, Leon; Winebarger, Amy R.; Warren, Harry P. +4 more
Observing high-temperature, low emission measure plasma is key to unlocking the coronal heating problem. With current instrumentation, a combination of EUV spectral data from Hinode Extreme-ultraviolet Imaging Spectrometer (EIS; sensitive to temperatures up to 4 MK) and broadband filter data from Hinode X-ray Telescope (XRT; sensitive to higher te…
Rapid Coeval Black Hole and Host Galaxy Growth in MRC 1138-262: The Hungry Spider
Altieri, B.; Valtchanov, I.; Stern, D. +30 more
We present a detailed study of the infrared spectral energy distribution of the high-redshift radio galaxy MRC 1138-26 at z = 2.156, also known as the Spiderweb Galaxy. By combining photometry from Spitzer, Herschel, and LABOCA we fit the rest-frame 5-300 µm emission using a two-component, starburst, and active galactic nucleus (AGN) model. …