110 research outputs found
Multi-messenger astrophysics in the gravitational-wave era
The observation of GW170817, the first binary neutron star merger observed in
both gravitational waves (GW) and electromagnetic (EM) waves, kickstarted the
age of multi-messenger GW astronomy. This new technique presents an
observationally rich way to probe extreme astrophysical processes. With the
onset of the LIGO-Virgo-KAGRA Collaboration's O4 observing run and wide-field
EM instruments well-suited for transient searches, multi-messenger astrophysics
has never been so promising. We review recent searches and results for
multi-messenger counterparts to GW events, and describe existing and upcoming
EM follow-up facilities, with a particular focus on WINTER, a new near-infrared
survey telescope, and TESS, an exoplanet survey space telescope.Comment: 5 pages, 1 figure, proceedings from TAUP 202
TESS Data Release Notes: Sector 18 DR25
This release note discusses the science data products produced by the Science Processing Operations Center at Ames Research Center from Sector 18 observations made with the TESS spacecraft and cameras as a means to document instrument performance and data characteristics
TESS Data Release Notes: Sector 17, DR24
This release note discusses the science data products produced by the Science Processing Operations Center at Ames Research Center from Sector 17 observations made with the TESS spacecraft and cameras as a means to document instrument performance and data characteristics
TESS Data Release Notes: Sector 16, DR22
This release note discusses the science data products produced by the Science Processing Operations Center at Ames Research Center from Sector 16 observations made with the TESS spacecraft and cameras as a means to document instrument performance and data characteristics
TESS Data Release Notes: Sector 9 DR11
This release note discusses the science data products produced by the Science Processing Operations Center at Ames Research Center from Sector 9 observations made with the TESS spacecraft and cameras as a means to document instrument performance and data characteristics
TESS Data Release Notes: Sector 20, DR27
This release note discusses the science data products produced by the Science Processing Operations Center at Ames Research Center from Sector 20 observations made with the TESS spacecraft and cameras as a means to document instrument performance and data characteristics
Klasika kao kamen temeljac (Vladan Švacov, Antička dramaturgija - antropografija antičke drame, ArTresor, Zagreb 2014.)
This work was supported by a Presidential Fellowship awarded to MF buy the Ohio State University. NSF grant AST-1008882 and STScI Grant GO-13330 supported MF and BP. KH acknowledges support from STFC grant ST/M001296/1.We show recent detections of inter-band continuum lags in three AGN (NGC 5548, NGC 2617, and MCG+08-11-011), which provide new constraints on the temperature profiles and absolute sizes of the accretion disks. We find lags larger than would be predicted for standard geometrically thin, optically thick accretion disks by factors of 2.3–3.3. For NGC 5548, the data span UV through optical/near-IR wavelengths, and we are able to discern a steeper temperature profile than the T ~ R−3/4 expected for a standard thin disk. Using a physical model, we are also able to estimate the inclinations of the disks for two objects. These results are similar to those found from gravitational microlensing of strongly lensed quasars, and provide a complementary approach for investigating the accretion disk structure in local, low luminosity AGN.Publisher PD
Spitzer Space Telescope Measurements of Dust Reverberation Lags in the Seyfert 1 Galaxy NGC 6418
We present results from a fifteen-month campaign of high-cadence (~ 3 days)
mid-infrared Spitzer and optical (B and V ) monitoring of the Seyfert 1 galaxy
NGC 6418, with the objective of determining the characteristic size of the
dusty torus in this active galactic nucleus (AGN). We find that the 3.6 m
and 4.5 m flux variations lag behind those of the optical continuum by
days and days, respectively. We
report a cross-correlation time lag between the 4.5 m and 3.6 m flux
of days. The lags indicate that the dust emitting at 3.6
m and 4.5 m is located at a distance of approximately 1 light-month
(~ 0.03 pc) from the source of the AGN UV-optical continuum. The reverberation
radii are consistent with the inferred lower limit to the sublimation radius
for pure graphite grains at 1800 K, but smaller by a factor of ~ 2 than the
corresponding lower limit for silicate grains; this is similar to what has been
found for near-infrared (K-band) lags in other AGN. The 3.6 and 4.5 m
reverberation radii fall above the K-band
size-luminosity relationship by factors and ,
respectively, while the 4.5 m reverberation radius is only 27% larger than
the 3.6 m radius. This is broadly consistent with clumpy torus models, in
which individual optically thick clouds emit strongly over a broad wavelength
range.Comment: 13 pages, 9 figure
TESS Data Release Notes: Sector 1, DR1
This release note discusses the science data products produced by the Science Processing Operations Center at Ames Research Center from Sector 1 observations made with the TESS spacecraft and cameras as a means to document instrument performance and data characteristics
TESS Data Release Notes: Sector 11, DR16
This release note discusses the science data products produced by the Science Processing Operations Center at Ames Research Center from Sector 11 observations made with the TESS spacecraft and cameras as a means to document instrument performance and data characteristics
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