585 research outputs found
Comment on “Equatorial Pacific coral geochemical records show recent weakening of the Walker circulation” by J. Carilli et al.
No full textThis article is a comment on Carilli et al. [2014] doi:10.1002/2014PA0026832015-11-1
Testing the evolutionary link between submillimetre galaxies and quasars: CO observations of QSOs at z~2
No full textWe have used the IRAM Plateau de Bure millimetre interferometer and the UKIRT 1–5 μm Imager Spectrometer (UIST) to test the connection between the major phases of spheroid growth and nuclear accretion by mapping CO emission in nine submillimetre-detected QSOs at z= 1.7–2.6 with black hole (BH) masses derived from near-infrared spectroscopy. When combined with one QSO obtained from the literature, we present sensitive CO(3–2) or CO(2–1) observations of 10 submillimetre-detected QSOs selected at the epoch of peak activity in both QSOs and submillimetre (submm) galaxies (SMGs). CO is detected in 5/6 very optically luminous (MB∼−28) submm-detected QSOs with BH masses MBH≃ 109–1010 M⊙, confirming the presence of large gas reservoirs of Mgas≃ 3.4 × 1010 M⊙. Our BH masses and dynamical mass constraints on the host spheroids suggest, at face value, that these optically luminous QSOs at z= 2 lie about an order of magnitude above the local BH–spheroid relation, MBH/Msph, although this result is dependent on the size and inclination of the CO-emitting region. However, we find that their BH masses are ∼30 times too large and their surface density is ∼300 times too small to be related to typical SMGs in an evolutionary sequence. Conversely, we measure weaker CO emission in four fainter (MB∼−25) submm-detected QSOs with properties, BH masses (MBH≃ 5 × 108 M⊙), and surface densities similar to SMGs. These QSOs appear to lie near the local MBH/Msph relation, making them plausible ‘transition objects’ in the proposed evolutionary sequence linking QSOs to the formation of massive young galaxies and BHs at high redshift. We show that SMGs have a higher incidence of bimodal CO line profiles than seen in our QSO sample, which we interpret as an effect of their relative inclinations, with the QSOs seen more face-on. Finally, we find that the gas masses of the four fainter submm-detected QSOs imply that their star formation episodes could be sustained for ∼10 Myr, and are consistent with representing a phase in the formation of massive galaxies which overlaps a preceding SMG starburst phase, before subsequently evolving into a population of present-day massive ellipticals
ACTH, beta-endorphin and Met-enkephalin: peripheral modifications during the stress of human labor
No full textWe investigated the psychoneuroendocrine and emotional correlates of the natural stress situation of human labor. State anxiety, subjective pain, plasma ACTH, peripheral plasma betalipotropin (Beta-LPH), beta-endorphin (Beta-EP), and met-enkephalin (Met-Enk) were serially evaluated at six predetermined time points before, and after labor in a sample of 14 women with normal pregnancies. State anxiety and subjective pain showed a progressive increase during labor, with a levelling during the final stage. Plasma Beta-EP and ACTH showed a similar progressive increasing from baseline until the end of labor. Beta-LPH showed no significant modification. Met-Enk remained at nearly baseline values throughout labor, with a marked progressive rise in the postpartum stage. The findings of this study seem to confirm the role of plasma Beta-EP as a stress hormone. Possible relationship between pain and anxiety curves and plasma Beta-EP are discussed in light of psychobiological studies on stress, the opioid system and analgesia. Plasma Met-Enk, according to our findings, should probably not be regarded as a stress hormone. Its rise in the postpartum stage might be as one of the psychoneuroendocrine mechanisms maintaining elevated prolactin levels during lactation. © 1985
The interstellar medium properties of heavily reddened quasarsand companions at z∼ 2.5 with ALMA and JVLA
No full textWe study the interstellar medium (ISM) properties of three heavily reddened quasars at z∼ 2.5 and three millimetre-bright companion galaxies near these quasars. New Karl G. Jansky Very Large Array (JVLA) and Atacama Large Millimeter Array (ALMA) observations constrain the CO(1-0), CO(7-6), and [CI]3P2-3P1 line emission and the far-infrared to radio continuum. The gas excitation and physical properties of the ISM are constrained by comparing our observations to photodissociation region models. The ISM in our high-redshift quasars is composed of very high-density, high-temperature gas that is already highly enriched in elements like carbon. One of our quasar hosts is shown to be a close-separation
Can circumcision be avoided in adult male with phimosis? Results of the PhimoStopTM prospective trial
No full textBackground: Circumcision as surgical treatment of adult phimosis is not devoid of complications. Efficacy of alternative non-surgical options is unclear. PhimoStop (TM) is a therapeutic protocol which involves the use of appropriately shaped silicone tuboids of increasing size to obtain a non-forced dilation of the prepuce. The aim of the study was to evaluate the efficacy and durability of results of PhimoStop (TM) device for the treatment of adult male phimosis.Methods: A prospective trial was conducted between 2018 and 2020 on 85 consecutive adult male patients affected by phimosis and with an indication for circumcision. Patients were treated with PhimoStop (TM) protocol and they were evaluated at baseline and after treatment through a subjective (patient self-reported information on various domains of his sexual function) and an objective assessment (evaluation of phimosis severity grade according to the Kikiros scale pre- and post-treatment, re-assessment of indication for circumcision post-treatment and validated questionnaires scores). Primary endpoint was to avoid the scheduled circumcision in 33% of the patients enrolled.Results: Seventy-one patients (84%) completed the device usage phase as per study protocol. Median duration of tuboid application was 60 days. Thirty-seven patients (52.1%) had no indication for circumcision after treatment. Even considering patients lost to follow-up as failures, primary endpoint was reached in 43.5% of cases. There was a significant reduction of the grade of phimosis after treatment (P<0.001). Moreover IIEF-5 showed a statistically significant improvement after treatment (P< 0.001). Thirty/37 patients who met the primary endpoint (81%) still have a successful resolution of their phimosis avoiding circumcision at a median follow-up of 24 months.Conclusions: PhimoStop (TM) device is effective for the treatment of adult male phimosis of Kikiros grade < 2. The results seem to be durable in most patients at a median follow-up of 24 months. Randomized clinical trials are necessary in order to confirm our results and assess cost-efficacy
The Discovery of Gas-Rich, Dusty Starbursts in Luminous Reddened Quasars at with ALMA
No full textWe present ALMA observations of cold dust and molecular gas in four high-luminosity, heavily reddened (A mag) Type 1 quasars at with virial MM, to test whether dusty, massive quasars represent the evolutionary link between submillimetre bright galaxies (SMGs) and unobscured quasars. All four quasars are detected in both the dust continuum and in the CO(3-2) line. The mean dust mass is 610M assuming a typical high redshift quasar spectral energy distribution (T=41K, =1.95 or T=47K, =1.6). The implied star formation rates are very high - 1000 M yr in all cases. Gas masses estimated from the CO line luminosities cover 1-5()M and the gas depletion timescales are very short - Myr. A range of gas-to-dust ratios is observed in the sample. We resolve the molecular gas in one quasar - ULASJ23150143 () - which shows a strong velocity gradient over 20 kpc. The velocity field is consistent with a rotationally supported gas disk but other scenarios, e.g. mergers, cannot be ruled out at the current resolution of these data. In another quasar - ULASJ1234+0907 () - we detected molecular line emission from two millimetre bright galaxies within 200 kpc of the quasar, suggesting that this quasar resides in a significant over-density. The high detection rate of both cold dust and molecular gas in these sources, suggests that reddened quasars could correspond to an early phase in massive galaxy formation associated with large gas reservoirs and significant star formation
Formation of cavities in the X-ray emitting cluster gas of Cygnus A
No full textPublisher's version/PDFThe ROSAT data from the cluster gas of Cygnus A are re-examined in light of a three-dimensional hydrodynamic simulation of a supersonic jet propagating in an isothermal King atmosphere designed to follow the observed density distribution of the Cygnus A cluster gas. In addition to the presence of a non-uniform atmosphere, this simulation departs from previous 3D work in that the X-ray (bremsstrahlung) brightness distribution has been determined from the flow variables as a function of time. This simulation provides compelling evidence for the conclusions reached by Carilli et al. who stated that the major features of the X-ray brightness distribution are manifestations of the expanding lobe and the passage of a bow shock within the atmosphere. Further, this work demonstrates that these X-ray features are as much a function of the observing frequency and bandwidth as they are of the local conditions in the cluster gas of Cygnus A. In addition, new estimates of the Mach number of the jet (M[greater than or equal to]4) as well as the density and temperature jumps across the bow shock are derived by comparing the simulations with the X-ray data from Cygnus A
Noise and interferometry
No full textRestricted Access. Synthesis Imaging in Radio Astronomy II, A Collection of Lectures from the Sixth NRAO/NMIMT Synthesis Imaging Summer School. Eds. G. B. Taylor, C. L. Carilli, and R. A. Perley. ASP Conference Series, Vol. 180, 1999.The nature of noise and its varied manifestations in radio and optical interferometry are the subject of this lecture
- …
