ABSTRACT
We report the results of long-term reverberation mapping campaigns of the nearby active galactic nuclei (AGNs) NGC 4151, spanning from 1994 to 2022, based on archived observations of the ...FAST Spectrograph Publicly Archived Programs and our new observations with the 2.3 m telescope at the Wyoming Infrared Observatory. We reduce and calibrate all the spectra in a consistent way, and derive light curves of the broad H β line and 5100 Å continuum. Continuum light curves are also constructed using public archival photometric data to increase sampling cadences. We subtract the host galaxy contamination using Hubble Space Telescope imaging to correct fluxes of the calibrated light curves. Utilizing the long-term archival photometric data, we complete the absolute flux-calibration of the AGN continuum. We find that the H β time delays are correlated with the 5100 Å luminosities as $\tau _{\rm H\beta }\propto L_{5100}^{0.46\pm 0.16}$. This is remarkably consistent with Bentz et al. (2013)’s global size–luminosity relationship of AGNs. Moreover, the data sets for five of the seasons allow us to obtain the velocity-resolved delays of the H β line, showing diverse structures (outflows, inflows, and discs). Combining our results with previous independent measurements, we find the measured dynamics of the H β broad-line region (BLR) are possibly related to the long-term trend of the luminosity. There is also a possible additional ∼1.86 yr time lag between the variation in BLR radius and luminosity. These results suggest that dynamical changes in the BLR may be driven by the effects of radiation pressure.
Abstract We report first-time reverberation-mapping results for 14 active galactic nuclei (AGNs) from the ongoing Monitoring AGNs with H β Asymmetry campaign (MAHA). These results utilize optical ...spectra obtained with the Long Slit Spectrograph on the Wyoming Infrared 2.3 m Telescope between 2017 November and 2023 May. MAHA combines long-duration monitoring with high cadence. We report results from multiple observing seasons for nine of the 14 objects. These results include H β time lags, supermassive black hole masses, and velocity-resolved time lags. The velocity-resolved lags allow us to investigate the kinematics of the broad-line region.
The OIII 5007 A emission line is the most common tracer of warm, ionized outflows in active galactic nuclei across cosmic time. JWST newly allows us to use mid-infrared spectral features at both high ...spatial and spectral resolution to probe these same winds. Here we present a comparison of ground-based, seeing-limited OIII and space-based, diffraction-limited SIV 10.51 micron maps of the powerful, kiloparsec-scale outflow in the Type 1 red quasar SDSS J110648.32+480712.3. The JWST data are from the Mid-InfraRed Instrument (MIRI). There is a close match in resolution between the datasets (0."6), in ionization potential of the O\(^{+2}\) and S\(^{+3}\) ions (35 eV), and in line sensitivity (1e-17 to 2e-17 erg/s/cm\(^2\)/arcsec\(^2\)). The OIII and SIV line shapes match in velocity and linewidth over much of the 20 kpc outflowing nebula, and SIV is the brightest line in the rest-frame 3.5-19.5 micron range, demonstrating its usefulness as a mid-IR probe of quasar outflows. OIII is nevertheless intriniscally brighter and provides better contrast with the point-source continuum, which is strong in the mid-IR. There is a strong anticorrelation of OIII/SIV with average velocity, which is consistent with a scenario of differential obscuration between the approaching (blueshifted) and receding (redshifted) sides of the flow. The dust in the wind may also obscure the central quasar, consistent with models that attribute red quasar extinction to dusty winds.
We report first-time reverberation mapping results for 14 AGNs from the
ongoing Monitoring AGNs with H$\beta$ Asymmetry campaign (MAHA). These results
utilize optical spectra obtained with the Long ...Slit Spectrograph on the Wyoming
Infrared 2.3m Telescope between 2017 November-2023 May. MAHA combines
long-duration monitoring with high cadence. We report results from multiple
observing seasons for 9 of the 14 objects. These results include H$\beta$ time
lags, supermassive black hole masses, and velocity-resolved time lags. The
velocity-resolved lags allow us to investigate the kinematics of the broad-line
region.
This paper presents a search for high redshift galaxies from the Euclid Early
Release Observations program "Magnifying Lens." The 1.5 deg$^2$ area covered by
the twin Abell lensing cluster fields is ...comparable in size to the few other
deep near-infrared surveys such as COSMOS, and so provides an opportunity to
significantly increase known samples of rare UV-bright galaxies at
$z\approx6-8$ ($M_{\rm UV}\lesssim-22$). Beyond their still uncertain role in
reionisation, these UV-bright galaxies are ideal laboratories from which to
study galaxy formation and constrain the bright-end of the UV luminosity
function. Of the 501994 sources detected from a combined $Y_{\rm E}$, $J_{\rm
E}$, and $H_{\rm E}$ NISP detection image, 168 do not have any appreciable
VIS/$I_{\rm E}$ flux. These objects span a range in spectral colours, separated
into two classes: 139 extremely red sources; and 29 Lyman-break galaxy
candidates. Best-fit redshifts and spectral templates suggest the former is
composed of both $z\gtrsim5$ dusty star-forming galaxies and $z\approx1-3$
quiescent systems. The latter is composed of more homogeneous Lyman break
galaxies at $z\approx6-8$. In both cases, contamination by L- and T-type dwarfs
cannot be ruled out with Euclid images alone. Additional contamination from
instrumental persistence is investigated using a novel time series analysis.
This work lays the foundation for future searches within the Euclid Deep
Fields, where thousands more $z\gtrsim6$ Lyman break systems and extremely red
sources will be identified.
We report the results of long-term reverberation mapping (RM) campaigns of the nearby active galactic nuclei (AGN) NGC 4151, spanning from 1994 to 2022, based on archived observations of the FAST ...Spectrograph Publicly Archived Programs and our new observations with the 2.3m telescope at the Wyoming Infrared Observatory. We reduce and calibrate all the spectra in a consistent way, and derive light curves of the broad H\(\beta\) line and 5100\,Å continuum. Continuum light curves are also constructed using public archival photometric data to increase sampling cadences. We subtract the host galaxy contamination using {\it HST} imaging to correct fluxes of the calibrated light curves. Utilizing the long-term archival photometric data, we complete the absolute flux-calibration of the AGN continuum. We find that the H\(\beta\) time delays are correlated with the 5100\,Å luminosities as \(\tau_{\rm H\beta}\propto L_{5100}^{0.46\pm0.16}\). This is remarkably consistent with Bentz et al. (2013)'s global size-luminosity relationship of AGNs. Moreover, the data sets for five of the seasons allow us to obtain the velocity-resolved delays of the H\(\beta\) line, showing diverse structures (outflows, inflows and disks). Combining our results with previous independent measurements, we find the measured dynamics of the H\(\beta\) broad-line region (BLR) are possibly related to the long-term trend of the luminosity. There is also a possible additional \(\sim\)1.86 years time lag between the variation in BLR radius and luminosity. These results suggest that dynamical changes in the BLR may be driven by the effects of radiation pressure.
We report first-time reverberation mapping results for 14 AGNs from the ongoing Monitoring AGNs with H\(\beta\) Asymmetry campaign (MAHA). These results utilize optical spectra obtained with the Long ...Slit Spectrograph on the Wyoming Infrared 2.3m Telescope between 2017 November-2023 May. MAHA combines long-duration monitoring with high cadence. We report results from multiple observing seasons for 9 of the 14 objects. These results include H\(\beta\) time lags, supermassive black hole masses, and velocity-resolved time lags. The velocity-resolved lags allow us to investigate the kinematics of the broad-line region.
This paper presents a search for high redshift galaxies from the Euclid Early Release Observations program "Magnifying Lens." The 1.5 deg\(^2\) area covered by the twin Abell lensing cluster fields ...is comparable in size to the few other deep near-infrared surveys such as COSMOS, and so provides an opportunity to significantly increase known samples of rare UV-bright galaxies at \(z\approx6-8\) (\(M_{\rm UV}\lesssim-22\)). Beyond their still uncertain role in reionisation, these UV-bright galaxies are ideal laboratories from which to study galaxy formation and constrain the bright-end of the UV luminosity function. Of the 501994 sources detected from a combined \(Y_{\rm E}\), \(J_{\rm E}\), and \(H_{\rm E}\) NISP detection image, 168 do not have any appreciable VIS/\(I_{\rm E}\) flux. These objects span a range in spectral colours, separated into two classes: 139 extremely red sources; and 29 Lyman-break galaxy candidates. Best-fit redshifts and spectral templates suggest the former is composed of both \(z\gtrsim5\) dusty star-forming galaxies and \(z\approx1-3\) quiescent systems. The latter is composed of more homogeneous Lyman break galaxies at \(z\approx6-8\). In both cases, contamination by L- and T-type dwarfs cannot be ruled out with Euclid images alone. Additional contamination from instrumental persistence is investigated using a novel time series analysis. This work lays the foundation for future searches within the Euclid Deep Fields, where thousands more \(z\gtrsim6\) Lyman break systems and extremely red sources will be identified.
Extracorporeal membrane oxygenation (ECMO) causes both thrombosis and bleeding. Major society guidelines recommend continuous, systemic anticoagulation to prevent thrombosis of the ECMO circuit, ...though this may be undesirable in those with active, or high risk of, bleeding. We aimed to systematically review thrombosis and bleeding outcomes in published cases of adults treated with ECMO without continuous systemic anticoagulation. Ovid MEDLINE, Cochrane CENTRAL and CDSR, and hand search via SCOPUS were queried. Eligible studies were independently reviewed by two blinded authors if they reported adults (≥18 years) treated with either VV- or VA-ECMO without continuous systemic anticoagulation for ≥24 hours. Patient demographics, clinical data, and specifics of ECMO technology and treatment parameters were collected. Primary outcomes of interest included incidence of bleeding, thrombosis of the ECMO circuit requiring equipment exchange, patient venous or arterial thrombosis, ability to wean off of ECMO, and mortality. Of the 443 total publications identified, 34 describing 201 patients met our inclusion criteria. Most patients were treated for either acute respiratory distress syndrome or cardiogenic shock. The median duration of anticoagulant-free ECMO was 4.75 days. ECMO circuity thrombosis and patient thrombosis occurred in 27 (13.4%) and 19 (9.5%) patients, respectively. Any bleeding and major or “severe” bleeding was reported in 66 (32.8%) and 56 (27.9%) patients, respectively. Forty patients (19%) died. While limited by primarily retrospective data and inconsistent reporting of outcomes, our systematic review of anticoagulant-free ECMO reveals an incidence of circuity and patient thrombosis comparable to patients receiving continuous systemic anticoagulation while on ECMO.
ABSTRACT
We present the results of photometric and spectroscopic monitoring campaigns of the changing look AGN NGC 3516 carried out in 2018 to 2020 covering the wavelength range from the X-ray to the ...optical. The facilities included the telescopes of the CMO SAI MSU, the 2.3-m WIRO telescope, and the XRT and UVOT of Swift. We found that NGC 3516 brightened to a high state and could be classified as Sy1.5 during the late spring of 2020. We have measured time delays in the responses of the Balmer and He ii λ4686 lines to continuum variations. In the case of the best-characterized broad H β line, the delay to continuum variability is about 17 d in the blue wing and is clearly shorter, 9 d, in the red, which is suggestive of inflow. As the broad lines strengthened, the blue side came to dominate the Balmer lines, resulting in very asymmetric profiles with blueshifted peaks during this high state. During the outburst the X-ray flux reached its maximum on 2020 April 1 and it was the highest value ever observed for NGC 3516 by the Swift observatory. The X-ray hard photon index became softer, ∼1.8 in the maximum on 2020 April 21 compared to the mean ∼0.7 during earlier epochs before 2020. We have found that the UV and optical variations correlated well (with a small time delay of 1–2 d) with the X-ray until the beginning of 2020 April, but later, until the end of 2020 June, these variations were not correlated. We suggest that this fact may be a consequence of partial obscuration by Compton-thick clouds crossing the line of sight.
PDF
