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The multiplicity of 250-µm Herschel sources in the COSMOS field
Griffin, Matt; Oliver, Seb; Wang, Lingyu +5 more
We investigate the multiplicity of extragalactic sources detected by the Herschel Space Observatory in the COSMOS field. Using 3.6- and 24-µm catalogues, in conjunction with 250-µm data from Herschel, we seek to determine if a significant fraction of Herschel sources are composed of multiple components emitting at 250 µm. We use …
Discovery of a Makemakean Moon
Buie, Marc W.; Noll, Keith S.; Parker, Alex H. +1 more
We describe the discovery of a satellite in orbit about the dwarf planet (136472) Makemake. This satellite, provisionally designated S/2015 (136472) 1, was detected in imaging data collected with the Hubble Space Telescope’s Wide Field Camera 3 on UTC 2015 April 27 at 7.80 ± 0.04 mag fainter than Makemake and at a separation of 0.″57. It likely ev…
A New Perspective of the Radio Bright Zone at The Galactic Center: Feedback from Nuclear Activities
Morris, Mark R.; Goss, W. M.; Zhao, Jun-Hui
New observations of Sgr A have been carried out with the Jansky VLA in the B and C arrays using the broadband (2 GHz) continuum mode at 5.5 GHz. The field of view covers the central 13‧ (30 pc) region of the radio-bright zone at the Galactic center. Using the multi-scale and multi-frequency-synthesis (MS-MFS) algorithms in CASA, we have imaged Sgr…
Upholding the unified model for active galactic nuclei: VLT/FORS2 spectropolarimetry of Seyfert 2 galaxies
Hönig, S. F.; Tadhunter, C. N.; Acosta-Pulido, J. A. +5 more
The origin of the unification model for active galactic nuclei (AGN) was the detection of broad hydrogen recombination lines in the optical polarized spectrum of the Seyfert 2 galaxy (Sy2) NGC 1068. Since then, a search for the hidden broad-line region (HBLR) of nearby Sy2s started, but polarized broad lines have only been detected in ∼30-40 per c…
Molecular Hydrogen Absorption from the Halo of a z ∼ 0.4 Galaxy
Charlton, Jane C.; Kacprzak, Glenn G.; Churchill, Christopher W. +1 more
Lyman- and Werner-band absorption of molecular hydrogen ({{{H}}}2) is detected in ∼50% of low-redshift (z\lt 1) DLAs/sub-DLAs with N({{{H}}}2) \gt {10}14.4 cm-2. However, the true origin(s) of the {{{H}}}2-bearing gas remain elusive. Here we report a new detection of an {{{H}}}2 abs…
Hubble Space Telescope observations of the host galaxies and environments of calcium-rich supernovae
Lyman, J. D.; Angus, C. R.; Davies, M. B. +4 more
Calcium-rich supernovae (SNe) represent a significant challenge for our understanding of the fates of stellar systems. They are less luminous than other SN types and they evolve more rapidly to reveal nebular spectra dominated by strong calcium lines with weak or absent signatures of other intermediate- and iron-group elements, which are seen in o…
Modeling the Solar Wind at the Ulysses, Voyager, and New Horizons Spacecraft
McComas, D. J.; Pogorelov, N. V.; Zank, G. P. +2 more
The outer heliosphere is a dynamic region shaped largely by the interaction between the solar wind and the interstellar medium. While interplanetary magnetic field and plasma observations by the Voyager spacecraft have significantly improved our understanding of this vast region, modeling the outer heliosphere still remains a challenge. We simulat…
Conditions for electron-cyclotron maser emission in the solar corona
Bloomfield, D. S.; Zucca, P.; Gallagher, P. T. +1 more
Context. The Sun is an active source of radio emission ranging from long duration radio bursts associated with solar flares and coronal mass ejections to more complex, short duration radio bursts such as solar S bursts, radio spikes and fibre bursts. While plasma emission is thought to be the dominant emission mechanism for most radio bursts, the …
Broadband Observations of High Redshift Blazars
Stalin, C. S.; Fabian, A. C.; Parker, M. L. +1 more
We present a multi-wavelength study of four high redshift blazars, S5 0014+81 (z = 3.37), CGRaBS J0225+1846 (z = 2.69), BZQ J1430+4205 (z = 4.72), and 3FGL J1656.2-3303 (z = 2.40) using quasi-simultaneous data from the Swift, Nuclear Spectroscopic Telescope Array (NuSTAR) and the Fermi-Large Area Telescope (LAT) and also archival XMM-Newton observ…
The missing satellite problem in 3D
Treu, T.; Torrey, Paul; Lu, Y. +3 more
It is widely believed that the large discrepancy between the observed number of satellite galaxies and the predicted number of dark subhaloes can be resolved via a variety of baryonic effects which suppress star formation in low-mass haloes. Supporting this hypothesis, numerous high-resolution simulations with star formation and associated feedbac…