Search Publications
Nonaxisymmetric Anisotropy of Solar Wind Turbulence
Chapman, S. C.; Hnat, B.; Turner, A. J. +2 more
A key prediction of turbulence theories is frame-invariance, and in magnetohydrodynamic (MHD) turbulence, axisymmetry of fluctuations with respect to the background magnetic field. Paradoxically the power in fluctuations in the turbulent solar wind are observed to be ordered with respect to the bulk macroscopic flow as well as the background magne…
The Black Hole Mass in the Brightest Cluster Galaxy NGC 6086
Ma, Chung-Pei; Graham, James R.; Gebhardt, Karl +4 more
We present the first direct measurement of the central black hole mass, M •, in NGC 6086, the Brightest Cluster Galaxy (BCG) in A2162. Our investigation demonstrates for the first time that stellar-dynamical measurements of M • in BCGs are possible beyond the nearest few galaxy clusters. We observed NGC 6086 with laser guide …
Molecular CO(1-0) Gas in the z ~ 2 Radio Galaxy MRC 0152-209
Villar-Martín, M.; Morganti, R.; Ekers, R. D. +12 more
We report the detection of molecular CO(1-0) gas in the high-z radio galaxy MRC 0152-209 (z = 1.92) with the Australia Telescope Compact Array Broadband Backend (ATCA/CABB). This is the third known detection of CO(1-0) in a high-z radio galaxy to date. CO(1-0) is the most robust tracer of the overall molecular gas content (including the widespread…
A 3D photoionization model of the extreme planetary nebula NGC 6302
Rauch, T.; Barlow, M. J.; Wright, N. J. +1 more
We present a 3D photoionization model of the planetary nebula NGC 6302, one of the most complex and enigmatic objects of its kind. Its highly bipolar geometry and dense massive disc, coupled with the very wide range of ions present, from neutral species up to Si8 +, make it one of the ultimate challenges to nebular photoionization model…
Properties of the Compact H II Region Complex G-0.02-0.07
Morris, M. R.; Wang, Q. D.; Dong, H. +4 more
We present new extinction maps and high-resolution Paschen-alpha images of G-0.02-0.07, a complex of compact H II regions located adjacent to the M-0.02-0.07 giant molecular cloud, 6 pc in projection from the center of the Galaxy. These H II regions, which lie in projection just outside the boundary of the Sgr A East supernova remnant, represent o…
Discovery of Gas Bulk Motion in the Galaxy Cluster Abell 2256 with Suzaku
Hayashida, Kiyoshi; Nagai, Masaaki; Tamura, Takayuki +1 more
The results from Suzaku observations of the galaxy cluster Abell 2256 are presented. This cluster is a prototypical and well-studied merging system, exhibiting substructures both in the X-ray surface brightness and in the radial velocity distribution of member galaxies. There are main and sub components separated by 3
GAMA/H-ATLAS: the ultraviolet spectral slope and obscuration in galaxies
Sutherland, W.; van Kampen, E.; Fritz, J. +59 more
We use multiwavelength data from the Galaxy And Mass Assembly (GAMA) and Herschel-ATLAS (H-ATLAS) surveys to compare the relationship between various dust obscuration measures in galaxies. We explore the connections between the ultraviolet (UV) spectral slope, β, the Balmer decrement and the far-infrared (FIR) to 150 nm far-ultraviolet (FUV) lumin…
Early-type Galaxies at z ~ 1.3. II. Masses and Ages of Early-type Galaxies in Different Environments and Their Dependence on Stellar Population Model Assumptions
Demarco, R.; Tanaka, M.; Rosati, P. +14 more
We have derived masses and ages for 79 early-type galaxies (ETGs) in different environments at z ~ 1.3 in the Lynx supercluster and in the GOODS/CDF-S field using multi-wavelength (0.6-4.5 µm KPNO, Palomar, Keck, Hubble Space Telescope, Spitzer) data sets. At this redshift the contribution of the thermally pulsing asymptotic giant branch (TP…
Hubble Space Telescope Morphologies of z ~ 2 Dust-obscured Galaxies. II. Bump Sources
Le Floc'h, E.; Armus, L.; Dey, Arjun +11 more
We present Hubble Space Telescope imaging of 22 ultra-luminous infrared galaxies (ULIRGs) at z ≈ 2 with extremely red R - [24] colors (called dust-obscured galaxies, or DOGs) which have a local maximum in their spectral energy distribution (SED) at rest-frame 1.6 µm associated with stellar emission. These sources, which we call "bump DOGs," …
Reconstructing the Triaxiality of the Galaxy Cluster A1689: Solving the X-ray and Strong Lensing Mass Discrepancy
Limousin, Marceau; Morandi, Andrea; Pedersen, Kristian
We present the first determination of the intrinsic triaxial shapes and three-dimensional physical parameters of both dark matter (DM) and the intracluster medium for the galaxy cluster A1689. We exploit the novel method we recently introduced in order to infer the three-dimensional physical properties in triaxial galaxy clusters by combining join…