Browsing FAS Scholarly Articles by Keyword "extinction"
Now showing items 1-14 of 14
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The Distortion of the Cosmic Microwave Background Spectrum Due to Intergalactic Dust
(American Astronomical Society, 2016)Infrared emission from intergalactic dust might compromise the ability of future experiments to detect subtle spectral distortions in the Cosmic Microwave Background (CMB) from the early Universe. We provide the first ... -
The Dust Emissivity Spectral Index in the Starless Core TMC-1C
(American Astronomical Society, 2009)In this paper, we present a dust emission map of the starless core TMC-1C taken at \(2100 \mu m\). Along with maps at 160, 450, 850, and 1200 μm, we study the dust emissivity spectral index from the (sub)millimeter spectral ... -
The Effect of Line-of-Sight Temperature Variation and Noise on Dust Continuum Observations
(American Astronomical Society, 2009)We investigate the effect of line-of-sight temperature variations and noise on two commonly used methods to determine dust properties from dust-continuum observations of dense cores. One method employs a direct fit to a ... -
Evidence for Grain Growth in Molecular Clouds: A Bayesian Examination of the Extinction Law in Perseus
(Royal Astronomical Society, 2013)We investigate the shape of the extinction law in two \(1^{\circ}\) square fields of the Perseus molecular cloud complex. We combine deep red-optical (r, i and z band) observations obtained using Megacam on the MMT with ... -
Evolution Caused by Extreme Events
(The Royal Society, 2017-05-08)Extreme events can be a major driver of evolutionary change over geological and contemporary timescales. Outstanding examples are evolutionary diversification following mass extinctions caused by extreme volcanism or ... -
Evolutionary Diversification of Clades of Squamate Reptiles
(Blackwell Publishing, 2007)We analysed the diversification of squamate reptiles (7488 species) based on a new molecular phylogeny, and compared the results to similar estimates for passerine birds (5712 species). The number of species in each of 36 ... -
Illuminating the Darkest Gamma-Ray Bursts With Radio Observations
(IOP Publishing, 2013)We present X-ray, optical, near-infrared (IR), and radio observations of GRBs 110709B and 111215A, as well as optical and near-IR observations of their host galaxies. The combination of X-ray detections and deep optical/near-IR ... -
Limits on Intergalactic Dust During Reionization
(American Astronomical Society, 2016)In this Letter, we constrain the dust-to-gas ratio in the intergalactic medium (IGM) at high redshifts. We employ models for dust in the local Universe to contrain the dust-to-gas ratio during the epoch of reionization at ... -
Phylogenetic patterns of species loss in Thoreau's woods are driven by climate change
(Proceedings of the National Academy of Sciences, 2008)Climate change has led to major changes in the phenology (the timing of seasonal activities, such as flowering) of some species but not others. The extent to which flowering-time response to temperature is shared among ... -
Primate Extinction Risk and Historical Patterns of Speciation and Extinction in Relation to Body Mass
(Royal Society of London, 2011)Body mass is thought to influence diversification rates, but previous studies have produced ambiguous results. We investigated patterns of diversification across 100 trees obtained from a new Bayesian inference of primate ... -
Species-Being and the Badness of Extinction and Death
(Springer Nature, 2018-04)This paper offers an account of the property Feuerbach and Marx called “species- being,” the human being’s distinctive tendency to identify herself as a member of her species, and to think of the species as a “we.” It links ... -
Star Formation in the Taurus filament L 1495: from Dense Cores to Stars
(Institute of Physics Publishing, Inc., 2010)We present a study of dense structures in the L1495 filament in the Taurus Molecular Cloud and examine its star-forming properties. In particular we construct a dust extinction map of the filament using deep near-infrared ... -
The total infrared luminosity may significantly overestimate the star formation rate of quenching and recently quenched galaxies
(Oxford University Press (OUP), 2014)The total infrared (IR) luminosity is very useful for estimating the star formation rate (SFR) of galaxies, but converting the IR luminosity into an SFR relies on assumptions that do not hold for all galaxies. We test the ... -
The "True" Column Density Distribution in Star-Forming Molecular Clouds
(American Astronomical Society, 2009)We use the COMPLETE Survey's observations of the Perseus star-forming region to assess and intercompare the three methods used for measuring column density in molecular clouds: near-infrared (NIR) extinction mapping; thermal ...