90 research outputs found
A powerful radio-loud quasar at the end of cosmic reionization
We present the discovery of the radio-loud quasar PSO J352.4034-15.3373 at
z=5.84 pm 0.02. This quasar is the radio brightest source known, by an order of
magnitude, at z~6 with a flux density in the range of 8-100 mJy from 3GHz to
230MHz and a radio loudness parameter R>~1000. This source provides an
unprecedented opportunity to study powerful jets and radio-mode feedback at the
highest redshifts, and presents the first real chance to probe deep into the
neutral intergalactic medium by detecting 21 cm absorption at the end of cosmic
reionization.Comment: ApJL accepted on May 8, 2018. See the companion paper by Momjian et
a
Registro de histeroscopias durante el período 2016-2017, hallazgos anatomopatológicos
La Histeroscopía es un procedimiento que permite al ginecólogo observar el interior de vagina, cuello y cuerpo uterino. Este procedimiento puede realizarse con fines diagnósticos y terapeúticos. Se indica para el tratamiento de miomas uterinos de localización submucosa, pólipos endometriales, malformaciones uterinas, sinequias. Se indica también para el estudio y diagnóstico de sangrados uterinos anormales, hemorragia genital de la postmenopausia, engrosamiento endoemtrial. También, con el instrumental adecuado, sirve para retirar cuerpos extraños, como metaplasia ósea, Dispositivo intrauterino retenido. La Histeroscopía juega un rol importante en la medicina reproductiva. Siempre que una Histerosalpingografía muestre alguna alteración de la cavidad uterina es indispensable realizar una Histeroscopía.
Objetivos: realizar un registro de Histeroscopías llevadas a cabo en el Htal. Italiano La Plata en el período 2016-2017, evaluando las patologías más frecuentes y su rango etario de prevalencia.Facultad de Ciencias Médica
Mapping the Lyman-Alpha Emission Around a z~6.6 QSO with MUSE: Extended Emission and a Companion at Close Separation
We utilize the Multi Unit Spectroscopic Explorer (MUSE) on the Very Large
Telescope (VLT) to search for extended Lyman-Alpha emission around the z~6.6
QSO J0305-3150. After carefully subtracting the point-spread-function, we reach
a nominal 5-sigma surface brightness limit of SB = 1.9x10
erg/s/cm/arcsec over a 1 arcsec aperture, collapsing 5 wavelength
slices centered at the expected location of the redshifted Lyman-Alpha emission
(i.e. at 9256 Ang.). Current data suggest the presence (5-sigma, accounting for
systematics) of a Lyman-Alpha nebula that extends for 9 kpc around the QSO.
This emission is displaced and redshifted by 155 km/s with respect to the
location of the QSO host galaxy traced by the [CII] emission line. The total
luminosity is L = 3.0x10 erg/s. Our analysis suggests that this emission
is unlikely to rise from optically thick clouds illuminated by the ionizing
radiation of the QSO. It is more plausible that the Lyman-Alpha emission is due
to fluorescence of the highly ionized optically thin gas. This scenario implies
a high hydrogen volume density of n ~ 6 cm. In addition, we detect a
Lyman-Alpha emitter (LAE) in the immediate vicinity of the QSO: i.e., with a
projected separation of 12.5 kpc and a line-of-sight velocity difference of 560
km/s. The luminosity of the LAE is L = 2.1x10 erg/s and its inferred
star-formation-rate is SFR ~ 1.3 M/yr. The probability of finding such
a close LAE is one order of magnitude above the expectations based on the
QSO-galaxy cross-correlation function. This discovery is in agreement with a
scenario where dissipative interactions favour the rapid build-up of
super-massive black holes at early Cosmic times.Comment: 17 pages, 15 figures. Accepted for publication in Ap
Mapping the Lyman-Alpha Emission Around a z~6.6 QSO with MUSE: Extended Emission and a Companion at Close Separation
We utilize the Multi Unit Spectroscopic Explorer (MUSE) on the Very Large
Telescope (VLT) to search for extended Lyman-Alpha emission around the z~6.6
QSO J0305-3150. After carefully subtracting the point-spread-function, we reach
a nominal 5-sigma surface brightness limit of SB = 1.9x10
erg/s/cm/arcsec over a 1 arcsec aperture, collapsing 5 wavelength
slices centered at the expected location of the redshifted Lyman-Alpha emission
(i.e. at 9256 Ang.). Current data suggest the presence (5-sigma, accounting for
systematics) of a Lyman-Alpha nebula that extends for 9 kpc around the QSO.
This emission is displaced and redshifted by 155 km/s with respect to the
location of the QSO host galaxy traced by the [CII] emission line. The total
luminosity is L = 3.0x10 erg/s. Our analysis suggests that this emission
is unlikely to rise from optically thick clouds illuminated by the ionizing
radiation of the QSO. It is more plausible that the Lyman-Alpha emission is due
to fluorescence of the highly ionized optically thin gas. This scenario implies
a high hydrogen volume density of n ~ 6 cm. In addition, we detect a
Lyman-Alpha emitter (LAE) in the immediate vicinity of the QSO: i.e., with a
projected separation of 12.5 kpc and a line-of-sight velocity difference of 560
km/s. The luminosity of the LAE is L = 2.1x10 erg/s and its inferred
star-formation-rate is SFR ~ 1.3 M/yr. The probability of finding such
a close LAE is one order of magnitude above the expectations based on the
QSO-galaxy cross-correlation function. This discovery is in agreement with a
scenario where dissipative interactions favour the rapid build-up of
super-massive black holes at early Cosmic times.Comment: 17 pages, 15 figures. Accepted for publication in Ap
Hiperandrogenismo secundario a tumor de células de Leydig de ovario en paciente postmenopáusica
El tumor de células de Leydig, también llamado tumor de células del hilio o tumor de Berger. Constituye uno de los tipos de tumores originados en los cordones sexuales y mesénquima específico. Es un tumor productor de andrógenos y, por lo tanto, masculinizante. Suelen ser unilaterales y de evolución benigna. Corresponden a menos del 0,5% de los tumores ováricos.
Dentro de las distintas patologías que cursan con hiperandrogenismo, el 70-80% corresponde al Sme. de ovario poliquístico, seguido del hirsutismo idiopático 5-15%, Hiperplasia suprarrenal congénita 1-8% y siendo una causa infrecuente, los tumores productores de andrógenos: 0,01-0,3%. Estos tumores pueden se de origen ováricos o adrenales. Es por eso, que es indispensable la valoración bioquímica como imagenológica.
Objetivos: reporte de caso de paciente femenina con hiperandrogenismo de larga data y Sme metabólico, sin hallazgos patológicos en ecografía o tomografía que pudieran justificar la causa del exceso de andrógenos circulantes.Facultad de Ciencias Médica
Copious Amounts of Dust and Gas in a z=7.5 Quasar Host Galaxy
We present IRAM/NOEMA and JVLA observations of the quasar J1342+0928 at
z=7.54 and report detections of copious amounts of dust and [CII] emission in
the interstellar medium (ISM) of its host galaxy. At this redshift, the age of
the universe is 690 Myr, about 10% younger than the redshift of the previous
quasar record holder. Yet, the ISM of this new quasar host galaxy is
significantly enriched by metals, as evidenced by the detection of the [CII]
158micron cooling line and the underlying far-infrared (FIR) dust continuum
emission. To the first order, the FIR properties of this quasar host are
similar to those found at a slightly lower redshift (z~6), making this source
by far the FIR-brightest galaxy known at z>7.5. The [CII] emission is spatially
unresolved, with an upper limit on the diameter of 7 kpc. Together with the
measured FWHM of the [CII] line, this yields a dynamical mass of the host of
<1.5x10^11 M_sun. Using standard assumptions about the dust temperature and
emissivity, the NOEMA measurements give a dust mass of (0.6-4.3)x10^8 M_sun.
The brightness of the [CII] luminosity, together with the high dust mass, imply
active ongoing star formation in the quasar host. Using [CII]-SFR scaling
relations, we derive star formation rates of 85-545 M_sun/yr in the host,
consistent with the values derived from the dust continuum. Indeed, an episode
of such past high star formation is needed to explain the presence of ~10^8
M_sun of dust implied by the observations.Comment: 8 pages, 4 figures. Published in ApJ Letter
A metal-poor damped Ly-alpha system at redshift 6.4
We identify a strong Ly-alpha damping wing profile in the spectrum of the
quasar P183+05 at z=6.4386. Given the detection of several narrow metal
absorption lines at z=6.40392, the most likely explanation for the absorption
profile is that it is due to a damped Ly-alpha system. However, in order to
match the data a contribution of an intergalactic medium 5-38% neutral or
additional weaker absorbers near the quasar is also required. The absorption
system presented here is the most distant damped Ly-alpha system currently
known. We estimate an HI column density (cm),
metallicity ([O/H]), and relative chemical abundances of a
system consistent with a low-mass galaxy during the first Gyr of the universe.
This object is among the most metal-poor damped Ly-alpha systems known and,
even though it is observed only ~850 Myr after the big bang, its relative
abundances do not show signatures of chemical enrichment by Population III
stars.Comment: Updated to match published versio
Ly Halos Around Quasars
We present deep MUSE observations of five quasars within the first Gyr of the
Universe (), four of which display extended Ly halos. After
PSF-subtraction, we reveal halos surrounding two quasars for the first time, as
well as confirming the presence of two more halos for which tentative
detections exist in long-slit spectroscopic observations and narrow-band
imaging. The four Ly halos presented here are diverse in morphology and
size, they each display spatial asymmetry, and none are centred on the position
of the quasar. Spectra of the diffuse halos demonstrate that none are
dramatically offset in velocity from the systemic redshift of the quasars
( v kms), however each halo shows a broad Ly
line, with a velocity width of order kms. Total Ly
luminosities range between erg s and erg s, reaching maximum radial extents of pkpc
from the quasar positions. We find larger sizes and higher Ly
luminosities than previous literature results at this redshift, but find no
correlation between the quasar properties and the Ly halo, suggesting
that the detected emission is most closely related to the physical properties
of the circum-galactic mediumComment: 19 pages, Accepted for publication in Ap
Concomitancia de atipías de mama homolateral
La enfermedad de Paget de la mama se expresa clínicamente como placa infiltrada, unlilateral, con eritema y escamas. A pesar de estar descripta su asociación con carcinomas ductales de la misma mama, la imagenología no siempre detecta una o ambas lesiones, siendo la clínica y la citología los elementos de orientación para detectar y confirmar esta patología .El Paget de la mama corresponde al 1-3% de la Patología Mamaria Maligna e incide en la postmenopausia, más precisamente entre la sexta y séptima décadas de la vida femenina.
Se han reportado hasta un 71% de informes que no advierten la presencia de atipías no palpables asociadas a Paget.Facultad de Ciencias Médica
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