Search Publications
A Refined Sample of Lyman Excess H II Regions
Kerton, C. R.; Marshall, Brandon
A large number (67) of the compact/ultra-compact H II regions identified in the Coordinated Radio and Infrared Survey for High-Mass Star Formation catalogue were determined to be powered by a Lyman continuum flux in excess of what was expected given their corresponding luminosity. In this study we attempt to reasonably explain the Lyman excess phe…
Globular cluster population of the HST Frontier Fields galaxy J07173724+3744224
López-Cruz, Omar; Barkhouse, Wayne A.; Carlson, Nathan L. +4 more
We present the first measurement of the globular cluster (GC) population surrounding the elliptical galaxy J07173724+3744224 (z = 0.1546). This galaxy is located in the foreground in the field-of-view of the Hubble Space Telescope (HST) Frontier Fields observations of galaxy cluster MACS J0717.5+3745 (z = 0.5458). Based on deep HST Advanced Camera…
Accidental deep field bias in CMB T and SNe z correlation
Friday, Tracey; Clowes, Roger G.; Raghunathan, Srinivasan +1 more
Evidence presented by Yershov, Orlov, and Raikov apparently showed that the WMAP/Planck cosmic microwave background (CMB) pixel-temperatures (T) at supernovae (SNe) locations tend to increase with increasing redshift (z). They suggest this correlation could be caused by the Integrated Sachs-Wolfe effect and/or by some unrelated foreground emission…
Detectability of Galactic Faraday Rotation in multiwavelength CMB observations
Mauskopf, Philip; Kolopanis, Matthew; Bowman, Judd
We introduce a new cross-correlation method to detect and verify the astrophysical origin of Faraday Rotation (FR) in multiwavelength surveys. FR is well studied in radio astronomy from radio point sources but the λ2 suppression of FR makes detecting and accounting for this effect difficult at millimeter and sub-millimeter wavelengths. …
XMM-Newton observations of NGC 3268 in the Antlia Galaxy Cluster: characterization of a hidden group of galaxies at z ≈ 0.41
Combi, J. A.; García, F.; Bassino, L. P. +2 more
We report on a detailed X-ray study of the extended emission of the intracluster medium (ICM) around NGC 3268 in the Antlia Cluster of galaxies, together with a characterization of an extended source in the field, namely a background cluster of galaxies at z ≈ 0.41, which was previously accounted as an X-ray point source. The spectral properties o…
The nature of X-ray spectral variability in SWIFT J2127.4+5654
Papadakis, I. E.; Kammoun, E. S.
We study the flux-flux plots (FFPs) of the Seyfert galaxy SWIFT J2127.4+5654 which was observed simultaneously by XMM-Newton and NuSTAR. The 0.7-2 keV FFPs show a non-linear behaviour, while they are well fitted by a straight line, in the ∼ 2-40 keV range. Without any additional modelling, this result strongly suggests that neither absorption nor …
9C spectral-index distributions and source-count estimates from 15 to 93 GHz - a re-assessment
Pooley, G. G.; Waldram, E. M.; Bolton, R. C. +1 more
In an earlier paper (2007), we used follow-up observations of a sample of sources from the 9C survey at 15.2 GHz to derive a set of spectral-index distributions up to a frequency of 90 GHz. These were based on simultaneous measurements made at 15.2 GHz with the Ryle telescope and at 22 and 43 GHz with the Karl G. Jansky Very Large Array (VLA). We …
SMSS J130522.47-293113.0: a high-latitude stellar X-ray source with pc-scale outflow relics?
Schmidt, B. P.; Da Costa, G. S.; Soria, R. +17 more
We report the discovery of an unusual stellar system SMSS J130522.47-293113.0. The optical spectrum is dominated by a blue continuum together with emission lines of hydrogen, neutral, and ionized helium, and the N III, C III blend at ∼4640-4650 Å. The emission-line profiles vary in strength and position on time-scales as short as 1 d, while optica…
Feasibility of the debris ring transit method for the solar-like star HD 107146 by an occulted galaxy
Holwerda, B. W.; Schneider, G.; Kenworthy, M. A. +2 more
Occulting galaxy pairs have been used to determine the transmission and dust composition within the foreground galaxy. Observations of the nearly face-on ring-like debris disc around the solar-like star HD 107146 by HST/ACS in 2004 and HST/STIS in 2011 reveal that the debris ring is occulting an extended background galaxy over the subsequent decad…
Observation of galactic cosmic ray spallation events from the SoHO mission 20-yr operation of LASCO
Koutchmy, S.; Tavabi, E.; Urtado, O.
A shower of secondary cosmic ray (CR) particles is produced at high altitudes in the Earth's atmosphere, so the primordial galactic cosmic rays (GCRs) are never directly measured outside the Earth magnetosphere and atmosphere. They approach the Earth and other planets in the complex pattern of rigidity's dependence, generally excluded by the magne…