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CARMA Large Area Star Formation Survey: Dense Gas in the Young L1451 Region of Perseus
Kwon, Woojin; Meisner, Aaron M.; Kauffmann, Jens +18 more
We present a 3 mm spectral line and continuum survey of L1451 in the Perseus Molecular Cloud. These observations are from the CARMA Large Area Star Formation Survey (CLASSy), which also imaged Barnard 1, NGC 1333, Serpens Main, and Serpens South. L1451 is the survey region with the lowest level of star formation activity—it contains no confirmed p…
Absorption at 11 µm in the interstellar medium and embedded sources: evidence for crystalline silicates
Wright, Christopher M.; Do Duy, Tho; Lawson, Warrick
An absorption feature is occasionally reported around 11 µm in astronomical spectra, including those of forming stars. Candidate carriers include water ice, polycyclic aromatic hydrocarbons, silicon carbide, crystalline silicates or even carbonates. All are known constituents of cosmic dust in one or more types of environments, though not ne…
Bayesian analysis of two stellar populations in Galactic globular clusters- III. Analysis of 30 clusters
Jefferys, W. H.; Stenning, D. C.; Wagner-Kaiser, R. +5 more
We use Cycle 21 Hubble Space Telescope (HST) observations and HST archival ACS Treasury observations of 30 Galactic globular clusters to characterize two distinct stellar populations. A sophisticated Bayesian technique is employed to simultaneously sample the joint posterior distribution of age, distance, and extinction for each cluster, as well a…
Nereid from space: rotation, size and shape analysis from K2, Herschel and Spitzer observations
Pál, A.; Molnár, L.; Müller, T. G. +8 more
In this paper, we present an analysis of K2 mission Campaign 3 observations of the irregular Neptune satellite, Nereid. We determined a rotation period of P = 11.594±0.017 h and amplitude of Δm = 0.0328m ± 0.0018m, confirming previous short rotation periods obtained in ground-based observations. The similarities of light-curve amplitudes between 2…
Lava heating and loading of ice sheets on early Mars: Predictions for meltwater generation, groundwater recharge, and resulting landforms
Head, James W.; Cassanelli, James P.
Recent modeling studies of the early Mars climate predict a predominantly cold climate, characterized by the formation of regional ice sheets across the highland areas of Mars. Formation of the predicted "icy highlands" ice sheets is coincident with a peak in the volcanic flux of Mars involving the emplacement of the Late Noachian - Early Hesperia…
Luminosity-dependent change of the emission diagram in the X-ray pulsar 4U 1626-67
Gilfanov, Marat; Koliopanos, Filippos
We detect variability of the Fe K α emission line in the spectrum of X-ray pulsar 4U 1626-67, correlated with changes in its luminosity and in the shape of its pulse profile. Analysis of archival Chandra and RXTE observations revealed the presence of an intrinsically narrow Fe K α emission line in the spectrum obtained during the source's current …
Quantitative prediction of type II solar radio emission from the Sun to 1 AU
Cairns, Iver H.; Schmidt, J. M.
Coronal mass ejections (CMEs) are frequently associated with shocks and type II solar radio bursts. Despite involving fundamental plasma physics and being the archetype for collective radio emission from shocks, type II bursts have resisted detailed explanation for over 60 years. Between 29 November and 1 December 2013 the two widely separated spa…
Strong Lyα Emission in the Proximate Damped Lyα Absorption Trough toward the Quasar SDSS J095253.83+011422.0
Shu, Xinwen; Gu, Qiusheng; Li, Zhenzhen +10 more
SDSS J095253.83+011422.0 (J0952+0114) was reported by Hall et al. as an exotic quasar at zem = 3.020. In contrast to prominent broad metal-line emission with FWHM ∼ 9000 km s-1, only a narrow Lyα emission line is present with FWHM ∼ 1000 km s-1. The absence of a broad Lyα emission line has been a mystery for more t…
New Insights into the Spectral Variability and Physical Conditions of the X-Ray Absorbers in NGC 4151
Turner, T. J.; Kraemer, S. B.; Crenshaw, D. M. +1 more
We investigate the relationship between the long-term X-ray spectral variability in the Seyfert 1.5 galaxy NGC 4151 and its intrinsic absorption, by comparing the 2014 simultaneous ultraviolet/X-ray observations taken with Hubble STIS Echelle and Chandra HETGS with archival observations from Chandra, XMM-Newton, and Suzaku. The observations are di…
Morphological Properties of Lyα Emitters at Redshift 4.86 in the Cosmos Field: Clumpy Star Formation or Merger?
Koekemoer, Anton M.; Kajisawa, Masaru; Nagao, Tohru +7 more
We investigate morphological properties of 61 Lyα emitters (LAEs) at z = 4.86 identified in the COSMOS field, based on Hubble Space Telescope Advanced Camera for Surveys (ACS) imaging data in the F814W band. Out of the 61 LAEs, we find the ACS counterparts for 54 LAEs. Eight LAEs show double-component structures with a mean projected separation of…