9 research outputs found
Routine care of peripheral intravenous catheters versus clinically indicated replacement: randomised controlled trial
Objective To compare routine replacement of intravenous peripheral catheters with replacement only when clinically indicated
LEGUS Discovery of a Light Echo Around Supernova 2012aw
We have discovered a luminous light echo around the normal Type II-Plateau
Supernova (SN) 2012aw in Messier 95 (M95; NGC 3351), detected in images
obtained approximately two years after explosion with the Wide Field Channel 3
on-board the Hubble Space Telescope (HST) by the Legacy ExtraGalactic
Ultraviolet Survey (LEGUS). The multi-band observations span from the
near-ultraviolet through the optical (F275W, F336W, F438W, F555W, and F814W).
The apparent brightness of the echo at the time was ~21--22 mag in all of these
bands. The echo appears circular, although less obviously as a ring, with an
inhomogeneous surface brightness, in particular, a prominent enhanced
brightness to the southeast. The SN itself was still detectable, particularly
in the redder bands. We are able to model the light echo as the time-integrated
SN light scattered off of diffuse interstellar dust in the SN environment. We
have assumed that this dust is analogous to that in the Milky Way with R_V=3.1.
The SN light curves that we consider also include models of the unobserved
early burst of light from the SN shock breakout. Our analysis of the echo
suggests that the distance from the SN to the scattering dust elements along
the echo is ~45 pc. The implied visual extinction for the echo-producing dust
is consistent with estimates made previously from the SN itself. Finally, our
estimate of the SN brightness in F814W is fainter than that measured for the
red supergiant star at the precise SN location in pre-SN images, possibly
indicating that the star has vanished and confirming it as the likely SN
progenitor.Comment: 10 pages, 9 figures, to appear in the Astrophysical Journa
Chandra and Spitzer unveil heavily obscured quasars in the SWIRE/Chandra Survey
Using the large multi-wavelength data set in the chandra/SWIRE Survey (0.6
square degrees in the Lockman Hole), we show evidence for the existence of
highly obscured (Compton-thick) AGN, estimate a lower limit to their surface
density and characterize their multi-wavelength properties. Two independent
selection methods based on the X-ray and infrared spectral properties are
presented. The two selected samples contain 1) 5 X-ray sources with hard X-ray
spectra and column densities > 10^24 cm-2, and 2) 120 infrared sources with red
and AGN-dominated infrared spectral energy distributions (SEDs). We estimate a
surface density of at least 25 Compton-thick AGN per square degree detected in
the infrared in the chandra/SWIRE field of which ~40% show distinct AGN
signatures in their optical/near-infrared SEDs, the remainings being dominated
by the host-galaxy emission. Only ~33% of all Compton-thick AGN are detected in
the X-rays at our depth (F(0.3-8 keV)>10^-15 erg/cm2/s.
We report the discovery of two sources in our sample of Compton-thick AGN,
SWIRE_J104409.95+585224.8 (z=2.54) and SWIRE_J104406.30+583954.1 (z=2.43),
which are the most luminous Compton-thick AGN at high-z currently known. The
properties of these two sources are discussed in detail with an analysis of
their spectra, SEDs, luminosities and black-hole masses.Comment: ApJ accepted (to appear in May 2006 issue, vol. 642, of ApJ) Figures
2, 3, and 14 have been degraded due to space consideration