80 research outputs found
Discriminating among theories of spiral structure using Gaia DR2
We compare the distribution in position and velocity of nearby stars from the
Gaia DR2 radial velocity sample with predictions of current theories for
spirals in disc galaxies. Although the rich substructure in velocity space
contains the same information, we find it more revealing to reproject the data
into action-angle variables, and we describe why resonant scattering would be
more readily identifiable in these variables. We compute the predicted changes
to the phase space density, in multiple different projections, that would be
caused by a simplified isolated spiral pattern, finding widely differing
predictions from each theory. We conclude that the phase space structure
present in the Gaia data shares many of the qualitative features expected in
the transient spiral mode model. We argue that the popular picture of
apparently swing-amplified spirals results from the superposition of a few
underlying spiral modes.Comment: Revised version accepted to appear in MNRAS. Some significant
improvements. A full resolution version of Fig 4 is available from
http://www.physics.rutgers.edu/~sellwood/mult_res.pd
Preliminary DIMM and MASS Nighttime Seeing Measurements at PEARL, in the Canadian High Arctic
Results of deploying a Differential Image Motion Monitor (DIMM) and a DIMM
combined with a Multi-Aperture Scintillation Sensor (MASS/DIMM) are reported
for campaigns in 2011 and 2012 on the roof of the Polar Environment Atmospheric
Research Laboratory (PEARL). This facility is on a 610-m-high ridge at latitude
80 degrees N, near the Eureka weatherstation on Ellesmere Island, Canada. The
median seeing at 8-m elevation is 0.85 arcsec or better based on DIMM data
alone, but is dependent on wind direction, and likely includes a component due
to the PEARL building itself. Results with MASS/DIMM yield a median seeing less
than 0.76 arcsec. A semi-empirical model of seeing versus ground wind speed is
introduced which allows agreement between these datasets, and with previous
boundary-layer profiling by lunar scintillometry from the same location. This
further suggests that best 20 percentile seeing reaches 0.53 arcsec, of which
typically 0.30 arcsec is due to the free atmosphere. Some discussion for
guiding future seeing instrumentation and characterization at this site is
provided.Comment: 16 pages, 11 figures, accepted for PAS
Predicted and observed evolution in the mean properties of Type Ia supernovae with redshift
Recent studies indicate that Type Ia supernovae (SNe Ia) consist of two
groups - a "prompt" component whose rates are proportional to the host galaxy
star formation rate, whose members have broader lightcurves and are
intrinsically more luminous, and a "delayed" component whose members take
several Gyr to explode, have narrower lightcurves, and are intrinsically
fainter. As cosmic star formation density increases with redshift, the prompt
component should begin to dominate. We use a two-component model to predict
that the average lightcurve width should increase by 6% from z=0-1.5. Using
data from various searches we find an 8.1% +/- 2.7% increase in average
lightcurve width for non-subluminous SNe Ia from z=0.03 - 1.12, corresponding
to an increase in the average intrinsic luminosity of 12%. To test whether
there is any bias after supernovae are corrected for lightcurve shape we use
published data to mimic the effect of population evolution and find no
significant difference in the measured dark energy equation of state parameter,
w. However, future measurements of time-variable w will require standardization
of SN Ia magnitudes to 2% up to z=1.7, and it is not yet possible to assess
whether lightcurve shape correction works at this level of precision. Another
concern at z=1.5 is the expected order of magnitude increase in the number of
SNe Ia that cannot be calibrated by current methods.Comment: 5 pages, 3 figures, accepted to ApJ Letters, addressed referee's
comments, table adde
Mass-to-Light Ratios of Galaxy Groups from Weak Lensing
We present the findings of our weak lensing study of a sample of 116 CNOC2
galaxy groups. The lensing signal is used to estimate the mass-to-light ratio
of these galaxy groups. The best fit isothermal sphere model to our lensing
data has an Einstein radius of 0.88"+/-0.12", which corresponds to a
shear-weighted velocity dispersion of 245+/-18 km/s. The mean mass-to-light
ratio within 1 h^-1 Mpc is 185+/-28 h times solar in the B-band and is
independent of radius from the group center.
The signal-to-noise ratio of the shear measurement is sufficient to split the
sample into subsets of "poor" and "rich" galaxy groups. The poor galaxy groups
were found to have an average velocity dispersion of 193+/-38 km/s and a
mass-to-light ratio of 134+/-26 h times solar in the B-band, while the rich
galaxy groups have a velocity dispersion of 270+/-39 km/s and a mass-to-light
ratio of 278+/-42 h times solar in the B-band, similar to the mass-to-light
ratio of clusters. This steep increase in the mass-to-light ratio as a function
of mass, suggests that the mass scale of ~10^13 solar masses is where the
transition between the actively star-forming field environment and the
passively-evolving cluster environment occurs. This is the first such detection
from weak lensing.Comment: Accepted for publication in ApJ 6 pages, 6 figures, uses emulateap
Clustering of Very Red Galaxies in the Las Campanas IR Survey
We report results from the first 1000 square arc-minutes of the Las Campanas
IR survey. We have imaged 1 square degree of high latitude sky in six distinct
fields to a 5-sigma H-band depth of 20.5 (Vega). Optical imaging in the
V,R,I,and z' bands allow us to select color subsets and
photometric-redshift-defined shells. We show that the angular clustering of
faint red galaxies (18 3) is an order of magnitude stronger
than that of the complete H-selected field sample. We employ three approaches
to estimate in order to invert w(theta) to derive r_0. We find that our
n(z) is well described by a Gaussian with = 1.2, sigma(z) = 0.15. From this
we derive a value for r_0 of 7 (+2,-1) co-moving H^{-1} Mpc at = 1.2. This
is a factor of ~ 2 larger than the clustering length for Lyman break galaxies
and is similar to the expectation for early type galaxies at this epoch.Comment: 5 pages, 2 figures, 1 table. To appear in proceedings of the
ESO/ECF/STScI workshop "Deep Fields" held in Garching, Germany, 9-12 October
200
Gemini Deep Deep Survey VI: Massive Hdelta-strong galaxies at z=1
We show that there has been a dramatic decline in the abundance of massive
galaxies with strong Hdelta stellar absorption lines from z=1.2 to the present.
These ``Hdelta-strong'', or HDS, galaxies have undergone a recent and rapid
break in their star-formation activity. Combining data from the Gemini Deep
Deep and the Sloan Digital Sky Surveys to make mass-matched samples
(M*>=10^10.2 Msun), with 25 and 50,255 galaxies, respectively), we find that
the fraction of galaxies in an HDS phase has decreased from about 50% at z=1.2
to a few percent today. This decrease in fraction is due to an actual decrease
in the number density of massive HDS systems by a factor of 2-4, coupled with
an increase in the number density of massive galaxies by about 30 percent. We
show that this result depends only weakly on the threshold chosen for the
Hdelta equivalent width to define HDS systems (if greater than 4 A) and
corresponds to a (1+z)^{2.5\pm 0.7} evolution. Spectral synthesis studies of
the high-redshift population using the PEGASE code, treating Hdelta_A, EW[OII],
Dn4000, and rest-frame colors, favor models in which the Balmer absorption
features in massive Hdelta-strong systems are the echoes of intense episodes of
star-formation that faded about 1 Gyr prior to the epoch of observation. The
z=1.4-2 epoch appears to correspond to a time at which massive galaxies are in
transition from a mode of sustained star formation to a relatively quiescent
mode with weak and rare star-formation episodes. We argue that the most likely
local descendants of the distant massive HDS galaxies are passively evolving
massive galaxies in the field and small groups.Comment: 16 pages, 12 figures, 3 tables, uses emulateapj.sty; updated to match
the version accepted by ApJ. One figure added, conclusions unchange
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