357 research outputs found
Detection of Two Massive CO Systems in 4C 41.17 at z = 3.8
We have detected CO(4-3) in the z=3.8 radio galaxy 4C 41.17 with the IRAM
Interferometer. The CO is in two massive (M_dyn ~ 6 x 10^10 M_Sun) systems
separated by 1.8" (13 kpc), and by 400 km/s in velocity, which coincide with
two different dark lanes in a deep Ly-alpha image. One CO component coincides
with the cm-radio core of the radio galaxy, and its redshift is close to that
of the HeII AGN line. The second CO component is near the base of a cone-shaped
region southwest of the nucleus, which resembles the emission-line cones seen
in nearby AGN and starburst galaxies. The characteristics of the CO sources and
their mm/submm dust continuum are similar to those found in ultraluminous IR
galaxies and in some high-z radio galaxies and quasars. The fact that 4C 41.17
contains two CO systems is further evidence for the role of mergers in the
evolution of galaxies at high redshift.Comment: 5 Pages, including 4 PostScript figures. Accepted for publication in
Astronomy & Astrophysics Letter
The relationship between the optical Halpha filaments and the X-ray emission in the core of the Perseus cluster
NGC 1275 in the centre of the Perseus cluster of galaxies, Abell 426, is
surrounded by a spectacular filamentary Halpha nebula. Deep Chandra X-ray
imaging has revealed that the brighter outer filaments are also detected in
soft X-rays. This can be due to conduction and mixing of the cold gas in the
filaments with the hot, dense intracluster medium. We show the correspondence
of the filaments in both wavebands and draw attention to the relationship of
two prominent curved NW filaments to an outer, buoyant radio bubble seen as a
hole in the X-ray image. There is a strong resemblance in the shape of the hole
and the disposition of the filaments to the behaviour of a large air bubble
rising in water. If this is a correct analogy, then the flow is laminar and the
intracluster gas around this radio source is not turbulent. We obtain a limit
on the viscosity of this gas.Comment: Accepted for publication in MNRA
Ly-alpha excess in high redshift radio galaxies: a signature of star formation
About 54% of radio galaxies at z>3 and 8% of radio galaxies at 2<z<3 show
unusually strong Ly-alpha emission, compared with the general population of
high redshift (z>2) radio galaxies. These Ly-alpha excess objects (LAEs) show
Ly-alpha/HeII values consistent with or above standard photoionization model
predictions.
We show that the most successful explanation is the presence of a young
stellar population which provides the extra supply of ionizing photons required
to explain the Ly-alpha excess in at least the most extreme LAEs (probably in
all of them).
The measurement of unusually high Ly-alpha ratios in the extended gas of some
high redshift radio galaxies suggests that star formation activity occurs in
spatial scales of tens of kpc.
We argue that, although the fraction of LAEs may be incompletely determined,
both at 23, the much larger fraction of LAEs found at z>3 is a
genuine redshift evolution and not due to selection effects. Therefore, our
results suggest that the radio galaxy phenomenon is more often associated with
a massive starburst at z>3 than at z<3.Comment: 14 pages, 5 figures, accepted for publication in MNRA
MicroRNA-26a Is Strongly Downregulated in Melanoma and Induces Cell Death through Repression of Silencer of Death Domains (SODD)
Melanoma is an aggressive cancer that metastasizes rapidly and is refractory to conventional chemotherapies. Identifying microRNAs (miRNAs) that are responsible for this pathogenesis is therefore a promising means of developing new therapies. We identified miR-26a through microarray and quantitative reverse-transcription–PCR (qRT-PCR) experiments as an miRNA that is strongly downregulated in melanoma cell lines as compared with primary melanocytes. Treatment of cell lines with miR-26a mimic caused significant and rapid cell death compared with a negative control in most melanoma cell lines tested. In surveying targets of miR-26a, we found that protein levels of SMAD1 (mothers against decapentaplegic homolog 1) and BAG-4/SODD were strongly decreased in sensitive cells treated with miR-26a mimic as compared with the control. The luciferase reporter assays further demonstrated that miR-26a can repress gene expression through the binding site in the 3′ untranslated region (3′UTR) of SODD (silencer of death domains). Knockdown of these proteins with small interfering RNA (siRNA) showed that SODD has an important role in protecting melanoma cells from apoptosis in most cell lines sensitive to miR-26a, whereas SMAD1 may have a minor role. Furthermore, transfecting cells with a miR-26a inhibitor increased SODD expression. Our findings indicate that miR-26a replacement is a potential therapeutic strategy for metastatic melanoma, and that SODD, in particular, is a potentially useful therapeutic target
Metal-Enriched Gaseous Halos around Distant Radio Galaxies: Clues to Feedback in Galaxy Formation
We present the results of an optical and near-IR spectroscopic study of giant nebular emission-line halos associated with three z > 3 radio galaxies, 4C 41.17, 4C 60.07, and B2 0902+34. Previous deep narrowband Lyα imaging revealed complex morphologies with sizes up to 100 kpc, possibly connected to outflows and AGN feedback from the central regions. The outer regions of these halos show quiet kinematics with typical velocity dispersions of a few hundred km s^(-1) and velocity shears that can mostly be interpreted as being due to rotation. The inner regions show shocked cocoons of gas closely associated with the radio lobes. These display disturbed kinematics and have expansion velocities and/or velocity dispersions >1000 km s^(-1). The core region is chemically evolved, and we also find spectroscopic evidence for the ejection of enriched material in 4C 41.17 up to a distance of ≈60 kpc along the radio axis. The dynamical structures traced in the Lyα line are, in most cases, closely echoed in the carbon and oxygen lines. This shows that the Lyα line is produced in a highly clumped medium of small filling factor and can therefore be used as a tracer of the dynamics of high-redshift radio galaxies (HzRGs). We conclude that these HzRGs are undergoing a final jet-induced phase of star formation with ejection of most of their interstellar medium before becoming "red and dead" elliptical galaxies
Integral Field Spectroscopy of two radio galaxies at z~2.3
In this article we study the morphology, kinematics and ionization properties
of the giant ionized gas nebulae surrounding two high redshift radio galaxies,
4C40.36 (z=2.27) and 4C48.48 (z=2.34).}{Integral Field Spectroscopy
observations were taken using the PPAK bundle of the PMAS spectrograph, mounted
on the 3.5m on the Calar Alto Observatory, in order to cover a field-of-view of
64" X 72" centered in each radio galaxy. The observations spanned over 5
nights, using two different spectral resolutions (with FWHM~4 AA and ~8 AA
respectively), covering the optical wavelength range from ~3700 AA to ~7100 AA,
which corresponds to the rest-frame ultraviolet range from ~1100 AA to ~2000 AA
>. Various emission lines are detected within this wavelength range, including
Lyalpha (1216 AA), NV (1240 AA), CIV (1549 AA), HeII (1640 AA), OIII] (1663 AA)
and CIII] (1909\AA). The dataset was used to derive the spatial distribution of
the flux intensity of each of these lines and the gas kinematics. The
properties of the emission lines in the nuclear regions were studied in
detail.In agreement with previous studies, we find that both objects are
embedded in a large ionized gas nebula, where Ly alpha emission is extended
across ~100 kpc or more. The CIV and HeII emission lines are also spatially
extended. The nebulae are generally aligned with the radio axis, although we
detect emission far from it. In 4C+48.48, there is a band of low Ly-alpha/CIV
running perpendicular to the radio axis, at the location of the active nucleus.
This feature might be the observational signature of an edge-on disk of neutral
gas. The kinematics of both nebulae are inconsistent with stable rotation,
although they are not inconsistent with infall or outflow.Comment: 14 pages, 5 figures, accepted for publishing in Astronomy &
Astrophysic
Diagnostic Accuracy of Spanish Language Depression-Screening Instruments
PURPOSE To make decisions about implementing systematic depression screening, primary care physicians who serve Spanish-speaking populations need to know whether Spanish language depression-screening instruments are accurate. We aimed to review systematically the evidence regarding diagnostic accuracy of depression-screening instruments in Spanish-speaking primary care populations
- …