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176 papers · 1 filter
Giant cavities, cooling and metallicity substructure in Abell 2204
J. S. Sanders, A. C. Fabian, G. B. Taylor
We present results from deep Chandra and XMM-Newton observations of the relaxed X-ray luminous galaxy cluster Abell 2204. We detect metallicity inhomogeneities in the intracluster…
SN 2001em: Not so Fast
F. K. Schinzel, G. B. Taylor, C. J. Stockdale +2
SN 2001em is a peculiar supernova, originally classified as Type Ib/c. About two years after the SN it was detected in the radio, showing a rising radio flux with an optically thin…
A comparison of chemistry and dust cloud formation in ultracool dwarf model atmospheres
Ch. Helling, A. Ackerman, F. Allard +8
The atmospheres of substellar objects contain clouds of oxides, iron, silicates, and other refractory condensates. Water clouds are expected in the coolest objects. The opacity of…
First measurement of the Head-Tail directional nuclear recoil signature at energies relevant to WIMP dark matter searches
S. Burgos, E. Daw, J. Forbes +19
We present first evidence for the so-called Head-Tail asymmetry signature of neutron-induced nuclear recoil tracks at energies down to 1.5 keV/amu using the 1m^3 DRIFT-IIc dark mat…
Radial Dependence of the Pattern Speed of M51
Sharon E. Meidt, Richard J. Rand, Michael R. Merrifield +2
The grand-design spiral galaxy M51 has long been a crucial target for theories of spiral structure. Studies of this iconic spiral can address the question of whether strong spiral…
The jet of Markarian 501 from millions of Schwarzschild radii down to a few hundreds
M. Giroletti, G. Giovannini, W. D. Cotton +4
Aims: The TeV BL Lac object Markarian 501 is a complex, core dominated radio source, with a one sided, twisting jet on parsec scales. In the present work, we attempt to extend our…
Observation of the suppression of the flux of cosmic rays above 4x10^19eV
The Pierre Auger Collaboration
The energy spectrum of cosmic rays above 2.5x10^18eV, derived from 20,000 events recorded at the Pierre Auger Observatory, is described. The spectral index gamma of the flux, J ~ E…
A shrinking Compact Symmetric Object: J11584+2450?
S. E. Tremblay, G. B. Taylor, J. F. Helmboldt +2
We present multi-frequency multi-epoch Very Long Baseline Array (VLBA) observations of J11584+2450. These observations clearly show this source, previously classified as a core-jet…
Predicting future duration from present age: Revisiting a critical assessment of Gott's rule
Carlton M. Caves
Gott has promulgated a rule for making probabilistic predictions of the future duration of a phenomenon based on the phenomenon's present age [Nature, Vol. 363, 315 (1993)]. I show…
A Search for H2CO 6cm Emission toward Young Stellar Objects III: VLA Observations
E. D. Araya, P. Hofner, W. M. Goss +3
We report the results of our third survey for formaldehyde (H2CO) 6cm maser emission in the Galaxy. Using the Very Large Array, we detected two new H2CO maser sources (G23.01-0.41…
MOND and the Universal Rotation Curve: similar phenomenologies
Gianfranco Gentile
The Modified Newtonian Dynamics (MOND) and the Universal Rotation Curve (URC) are two ways to describe the general properties of rotation curves, with very different approaches con…
Spatial and Temporal Variations in Interstellar Absorption toward HD 72127AB
Daniel E. Welty, Thuso Simon, L. M. Hobbs
New optical spectra of Ca II and Na I toward HD 72127AB provide additional evidence for both spatial and temporal variations in the complex interstellar absorption along the two si…
Ideal magnetohydrodynamic simulation of magnetic bubble expansion as a model for extragalactic radio lobes
Wei Liu, Scott C. Hsu, Hui Li +2
Nonlinear ideal magnetohydrodynamic (MHD) simulations of the propagation and expansion of a magnetic "bubble" plasma into a lower density, weakly-magnetized background plasma are p…
Very Large Array Observations of Galactic Center OH 1720 MHz Masers in Sagittarius A East and in the Circumnuclear Disk
L. O. Sjouwerman, Y. M. Pihlstrom
We present Very Large Array (VLA) radio interferometry observations of the 1720 MHz OH masers in the Galactic Center (GC). Most 1720 MHz OH masers arise in regions where the supern…
Search for Correlations between HiRes Stereo Events and Active Galactic Nuclei
R. U. Abbasi, T. Abu-Zayyad, M. Allen +61
We have searched for correlations between the pointing directions of ultrahigh energy cosmic rays observed by the High Resolution Fly's Eye experiment and Active Galactic Nuclei (A…
Current star formation in early-type galaxies and the K+A phenomenon
J. F. Helmboldt, R. A. M. Walterbos, T. Goto
We present the results of an effort to identify and study a sample of the likely progenitors of elliptical (E) and lenticular (S0) K+A galaxies. To achieve this, we have searched a…
A Statistical Description of AGN Jet Evolution from the VLBA Imaging and Polarimetry Survey (VIPS)
J. F. Helmboldt, G. B. Taylor, R. C. Walker +1
A detailed analysis of the evolution of the properties of core-jet systems within the VLBA Imaging and Polarimetry Survey (VIPS) is presented. We find a power-law relationship betw…
Milky Way potentials in CDM and MOND. Is the Large Magellanic Cloud on a bound orbit?
Xufen Wu, Benoit Famaey, Gianfranco Gentile +2
We compute the Milky Way potential in different cold dark matter (CDM) based models, and compare these with the modified Newtonian dynamics (MOND) framework. We calculate the axis…
An upper limit on the electron-neutrino flux from the HiRes detector
R. U. Abbasi, T. Abu-Zayyad, M. Allen +64
Air-fluorescence detectors such as the High Resolution Fly's Eye (HiRes) detector are very sensitive to upward-going, Earth-skimming ultrahigh energy electron-neutrino-induced show…
Infrared Spectroscopy of the Diffuse Ionized Halo of NGC 891
Richard J. Rand, Kenneth Wood, Robert A. Benjamin
We present infrared spectroscopy from the Spitzer Space Telescope at one disk position and two positions at a height of 1 kpc from the disk in the edge-on spiral NGC 891, with the…
Upper limit on the cosmic-ray photon flux above 10^19 eV using the surface detector of the Pierre Auger Observatory
The Pierre Auger Collaboration
A method is developed to search for air showers initiated by photons using data recorded by the surface detector of the Auger Observatory. The approach is based on observables sens…
Vertically Extended Neutral Gas in the Massive Edge-on Spiral NGC 5746
Richard J. Rand, Robert A. Benjamin
We present Very Large Array 21-cm observations of the massive edge-on spiral galaxy NGC 5746. This galaxy has recently been reported to have a luminous X-ray halo, which has been t…
Excited-state OH Masers and Supernova Remnants
Ylva M. Pihlström, Vincent L. Fish, Loránt O. Sjouwerman +3
The collisionally pumped, ground-state 1720 MHz maser line of OH is widely recognized as a tracer for shocked regions and observed in star forming regions and supernova remnants. W…
Neutrinos as galactic dark matter in the Ursa Major galaxy group?
G. Gentile, H. S. Zhao, B. Famaey
We present the analysis of 23 published rotation curves of disk galaxies belonging to the Ursa Major group of galaxies, with kinematics free of irregularities. The rotation curves…