2,137 research outputs found
Use NASA GES DISC Data in ArcGIS
This presentation describes GIS relevant data at NASA Goddard Earth Sciences Data and Information Services Center (GES DISC), GES DISC Services and Support for GIS Users, and use cases of GES DISC data in ArcGIS
A DVH‐guided IMRT optimization algorithm for automatic treatment planning and adaptive radiotherapy replanning
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/135098/1/mp5700.pd
HST/STIS Spectroscopy of the Intermediate Polar EX Hydrae
We present the results of our analysis of six orbits of HST/STIS time-tagged
spectroscopy of the intermediate polar, EX Hydrae. The high time and wavelength
resolution of the HST/STIS spectra provided an excellent opportunity to study
the UV properties of EX Hya. Measurements of the continuum and emission line
fluxes corroborate earlier studies that show that the emission line fluxes are
modulated more strongly than the continuum flux and originate from the
accretion curtains, while the continuum flux originates from the white dwarf
photosphere. The measured K amplitude of the narrow emission line radial
velocity curve is used to calculate a white dwarf mass of 0.91+/-0.05 M_sun.
Synthetic white dwarf photosphere and accretion disk spectral models are used
to further refine the white dwarf and accretion disk properties. Using the
spectral models, it is determined that EX Hya has a white dwarf of mass 0.9
M_sun, T=23000 K, an accretion disk truncated at 2.5 R_WD, and is at a distance
of 60 pc.Comment: Accepted to ApJ, 28 pages including 12 figure
Nova-like Cataclysmic Variables in the Infrared
Novalike cataclysmic variables have persistently high mass transfer rates and prominent steady state accretion disks. We present an analysis of infrared observations of twelve novalikes obtained from the Two Micron All Sky Survey, the Spitzer Space Telescope, and the Wide-field Infrared Survey Explorer All Sky Survey. The presence of an infrared excess at >3-5 microns over the expectation of a theoretical steady state accretion disk is ubiquitous in our sample. The strength of the infrared excess is not correlated with orbital period, but shows a statistically significant correlation (but shallow trend) with system inclination that might be partially (but not completely) linked to the increasing view of the cooler outer accretion disk and disk rim at higher inclinations. We discuss the possible origin of the infrared excess in terms of emission from bremsstrahlung or circumbinary dust, with either mechanism facilitated by the mass outflows (e.g., disk wind/corona, accretion stream overflow, and so on) present in novalikes. Our comparison of the relative advantages and disadvantages of either mechanism for explaining the observations suggests that the situation is rather ambiguous, largely circumstantial, and in need of stricter observational constraints.Peer reviewe
The Vehicle, Fall 1983
Vol. 25, No. 1
Table of Contents
Amish BoyDevon Flesorpage 3
SyllogismJ. Maura Davispage 3
Ten SecondsD.L. Lewispage 4
The Cedar ChestBridget M. Howepage 4
A Christmas With CarolSteve Longpage 5
TeethMichelle Mitchellpage 7
An I-Love-You PoemD.L. Lewispage 8
The Dragon SlayerSusan Gradypage 8
A DefinitionAmy J. Eadespage 9
FingernailsSuzanne Hornpage 10
The Liar\u27s TableBrook Wilsonpage 10
Fifi\u27s Last PartySteve Longpage 12
Absence/PresenceSuzanne Hornpage 13
From the Rantings of a Mad Astronomy StudentAmy J. Eadespage 13
In the Name of the Father, the Son, and MachiavelliF. Link Rapierpage 15
Errant LoverBecky Lawsonpage 16
DaddyKevin Lylespage 16
GhostsGary Ervinpage 17
TangoF. Link Rapierpage 17
Grandma\u27s SlippersBecky Lawsonpage 18
EdgesAmy J. Eadespage 19
Having ChildrenDevon Flesorpage 20
Young Black GirlKevin Lylespage 21
CatSuzanne Hornpage 22
Breakfast for OneMichelle Mitchellpage 22
A Modest ProposalBrooke Sanfordpage 23
Post MortemF. Link Rapierpage 26
Who Said I Forgot?Lynne Krausepage 27
The Corner Booth at StuckeysMaggie Kennedypage 28
The First DayDavis Brydenpage 29
DownLynne Krausepage 30
Fairie RingDevon Flesorpage 31
The LaundrymatKathy Fordpage 32
Sunday in OctoberBridget M. Howepage 32
The Kitchen WindowMaggie Kennedypage 33
UntitledChristina Maire Vitekpage 34
8th Grade Field Trip to SpringfieldMichelle Mitchellpage 34
Children of the FortiesF. Link Rapierpage 35
one winter and i was eightGary Ervinpage 35
Don\u27t we all know?Thomas B. Waltrippage 36
The TravelerMaggie Kennedypage 36
The VisitKathy Fordpage 40
CubismMaggie Kennedypage 40https://thekeep.eiu.edu/vehicle/1042/thumbnail.jp
The Vehicle, Fall 1983
Vol. 25, No. 1
Table of Contents
Amish BoyDevon Flesorpage 3
SyllogismJ. Maura Davispage 3
Ten SecondsD.L. Lewispage 4
The Cedar ChestBridget M. Howepage 4
A Christmas With CarolSteve Longpage 5
TeethMichelle Mitchellpage 7
An I-Love-You PoemD.L. Lewispage 8
The Dragon SlayerSusan Gradypage 8
A DefinitionAmy J. Eadespage 9
FingernailsSuzanne Hornpage 10
The Liar\u27s TableBrook Wilsonpage 10
Fifi\u27s Last PartySteve Longpage 12
Absence/PresenceSuzanne Hornpage 13
From the Rantings of a Mad Astronomy StudentAmy J. Eadespage 13
In the Name of the Father, the Son, and MachiavelliF. Link Rapierpage 15
Errant LoverBecky Lawsonpage 16
DaddyKevin Lylespage 16
GhostsGary Ervinpage 17
TangoF. Link Rapierpage 17
Grandma\u27s SlippersBecky Lawsonpage 18
EdgesAmy J. Eadespage 19
Having ChildrenDevon Flesorpage 20
Young Black GirlKevin Lylespage 21
CatSuzanne Hornpage 22
Breakfast for OneMichelle Mitchellpage 22
A Modest ProposalBrooke Sanfordpage 23
Post MortemF. Link Rapierpage 26
Who Said I Forgot?Lynne Krausepage 27
The Corner Booth at StuckeysMaggie Kennedypage 28
The First DayDavis Brydenpage 29
DownLynne Krausepage 30
Fairie RingDevon Flesorpage 31
The LaundrymatKathy Fordpage 32
Sunday in OctoberBridget M. Howepage 32
The Kitchen WindowMaggie Kennedypage 33
UntitledChristina Maire Vitekpage 34
8th Grade Field Trip to SpringfieldMichelle Mitchellpage 34
Children of the FortiesF. Link Rapierpage 35
one winter and i was eightGary Ervinpage 35
Don\u27t we all know?Thomas B. Waltrippage 36
The TravelerMaggie Kennedypage 36
The VisitKathy Fordpage 40
CubismMaggie Kennedypage 40https://thekeep.eiu.edu/vehicle/1042/thumbnail.jp
The First Hour of Extra-galactic Data of the Sloan Digital Sky Survey Spectroscopic Commissioning: The Coma Cluster
On 26 May 1999, one of the Sloan Digital Sky Survey (SDSS) fiber-fed
spectrographs saw astronomical first light. This was followed by the first
spectroscopic commissioning run during the dark period of June 1999. We present
here the first hour of extra-galactic spectroscopy taken during these early
commissioning stages: an observation of the Coma cluster of galaxies. Our data
samples the Southern part of this cluster, out to a radius of 1.5degrees and
thus fully covers the NGC 4839 group. We outline in this paper the main
characteristics of the SDSS spectroscopic systems and provide redshifts and
spectral classifications for 196 Coma galaxies, of which 45 redshifts are new.
For the 151 galaxies in common with the literature, we find excellent agreement
between our redshift determinations and the published values. As part of our
analysis, we have investigated four different spectral classification
algorithms: spectral line strengths, a principal component decomposition, a
wavelet analysis and the fitting of spectral synthesis models to the data. We
find that a significant fraction (25%) of our observed Coma galaxies show signs
of recent star-formation activity and that the velocity dispersion of these
active galaxies (emission-line and post-starburst galaxies) is 30% larger than
the absorption-line galaxies. We also find no active galaxies within the
central (projected) 200 h-1 Kpc of the cluster. The spatial distribution of our
Coma active galaxies is consistent with that found at higher redshift for the
CNOC1 cluster survey. Beyond the core region, the fraction of bright active
galaxies appears to rise slowly out to the virial radius and are randomly
distributed within the cluster with no apparent correlation with the potential
merger of the NGC 4839 group. [ABRIDGED]Comment: Accepted in AJ, 65 pages, 20 figures, 5 table
Infrared Spectroscopic Observations of the Secondary Stars of Short Period Sub-Gap Cataclysmic Variables
We present K-band spectroscopy of short period, "sub-gap" cataclysmic
variable (CV) systems obtained using ISAAC on the VLT. We show the infrared
spectra (IR) for nine systems below the 2-3 hour period gap: V2051 Oph, V436
Cen, EX Hya, VW Hyi, Z Cha, WX Hyi, V893 Sco, RZ Leo, and TY PsA. We are able
to clearly detect the secondary star in all but WX Hyi, V893 Sco, and TY PsA.
We present the first direct detection of the secondary stars of V2051 Oph, V436
Cen, and determine new spectral classifications for EX Hya, VW Hyi, Z Cha, and
RZ Leo. We find that the CO band strengths of all but Z Cha appear normal for
their spectral types, in contrast to their longer period cousins above the
period gap. This brings the total number of CVs and pre-CVs with moderate
resolution (R >~ 1500) IR spectroscopy to sixty-one systems: nineteen pre-CVs,
thirty-one non-magnetic systems, and eleven magnetic or partially magnetic
systems. We discuss the trends seen in the IR abundance patterns thus far, and
highlight a potential link between anomalous abundances seen in the IR with the
C IV/N V anomaly seen in the ultraviolet. We present a compilation of all
systems with sufficient resolution IR observations to assess the CO band
strengths, and, by proxy, obtain an estimate on the C abundance on the
secondary star.Comment: 44 pages, 8 figures, 4 tables. Accepted for publication to Ap
LSST: from Science Drivers to Reference Design and Anticipated Data Products
(Abridged) We describe here the most ambitious survey currently planned in
the optical, the Large Synoptic Survey Telescope (LSST). A vast array of
science will be enabled by a single wide-deep-fast sky survey, and LSST will
have unique survey capability in the faint time domain. The LSST design is
driven by four main science themes: probing dark energy and dark matter, taking
an inventory of the Solar System, exploring the transient optical sky, and
mapping the Milky Way. LSST will be a wide-field ground-based system sited at
Cerro Pach\'{o}n in northern Chile. The telescope will have an 8.4 m (6.5 m
effective) primary mirror, a 9.6 deg field of view, and a 3.2 Gigapixel
camera. The standard observing sequence will consist of pairs of 15-second
exposures in a given field, with two such visits in each pointing in a given
night. With these repeats, the LSST system is capable of imaging about 10,000
square degrees of sky in a single filter in three nights. The typical 5
point-source depth in a single visit in will be (AB). The
project is in the construction phase and will begin regular survey operations
by 2022. The survey area will be contained within 30,000 deg with
, and will be imaged multiple times in six bands, ,
covering the wavelength range 320--1050 nm. About 90\% of the observing time
will be devoted to a deep-wide-fast survey mode which will uniformly observe a
18,000 deg region about 800 times (summed over all six bands) during the
anticipated 10 years of operations, and yield a coadded map to . The
remaining 10\% of the observing time will be allocated to projects such as a
Very Deep and Fast time domain survey. The goal is to make LSST data products,
including a relational database of about 32 trillion observations of 40 billion
objects, available to the public and scientists around the world.Comment: 57 pages, 32 color figures, version with high-resolution figures
available from https://www.lsst.org/overvie
The state of the Martian climate
60°N was +2.0°C, relative to the 1981–2010 average value (Fig. 5.1). This marks a new high for the record. The average annual surface air temperature (SAT) anomaly for 2016 for land stations north of starting in 1900, and is a significant increase over the previous highest value of +1.2°C, which was observed in 2007, 2011, and 2015. Average global annual temperatures also showed record values in 2015 and 2016. Currently, the Arctic is warming at more than twice the rate of lower latitudes
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