scholarly journals Anomalous gas in ESO 149-G003: A MeerKAT-16 View

2020 ◽  
Author(s):  
Gyula I G Józsa ◽  
Kshitij Thorat ◽  
Peter Kamphuis ◽  
Lerato Sebokolodi ◽  
Eric K Maina ◽  
...  
Keyword(s):  
Neutral Hydrogen ◽  
Data Cube ◽  
Optical Observations ◽  
Rotating Disc ◽  
Optical Telescope ◽  
Ring Model ◽  
Neutral Gas ◽  
The Galaxy ◽  
High Degree

Abstract ESO 149-G003 is a close-by, isolated dwarf irregular galaxy. Previous observations with the ATCA indicated the presence of anomalous neutral hydrogen (H i) deviating from the kinematics of a regularly rotating disc. We conducted follow-up observations with the MeerKAT radio telescope during the 16-dish Early Science programme as well as with the MeerLICHT optical telescope. Our more sensitive radio observations confirm the presence of anomalous gas in ESO 149-G003, and further confirm the formerly tentative detection of an extraplanar H i component in the galaxy. Employing a simple tilted-ring model, in which the kinematics is determined with only four parameters but including morphological asymmetries, we reproduce the galaxy’s morphology, which shows a high degree of asymmetry. By comparing our model with the observed H i, we find that in our model we cannot account for a significant (but not dominant) fraction of the gas. From the differences between our model and the observed data cube we estimate that at least 7%-8% of the H i in the galaxy exhibits anomalous kinematics, while we estimate a minimum mass fraction of less than 1% for the morphologically confirmed extraplanar component. We investigate a number of global scaling relations and find that, besides being gas-dominated with a neutral gas-to-stellar mass ratio of 1.7, the galaxy does not show any obvious global peculiarities. Given its isolation, as confirmed by optical observations, we conclude that the galaxy is likely currently acquiring neutral gas. It is either re-accreting gas expelled from the galaxy or accreting pristine intergalactic material.

scholarly journals Analysis of Low-and High-Resolution Observations of High-Velocity Clouds

1989 ◽  
Vol 120 ◽  
pp. 416-423
Author(s):  
Bart P. Wakker
Keyword(s):  
High Velocity ◽  
Galactic Center ◽  
Neutral Hydrogen ◽  
Current Status ◽  
Galactic Rotation ◽  
Single Model ◽  
Neutral Gas ◽  
The Galaxy ◽  
High Velocity Clouds ◽  
Distance Problem

For almost three decades neutral hydrogen moving at velocities unexplicable by galactic rotation has been observed. These so-called high-velocity clouds (HVCs) have been invoked as evidence for infall of neutral gas to the galaxy, as manifestations of a galactic fountain, as energy source for the formation of supershells, etc. No general consensus about their origin has presently been reached. However, it is becoming clear that no single model will suffice to explain all HVCs. A number of clouds may consist of material streaming toward the galactic center, as Mirabel (this conference) has advocated for several years, though their origin still remains unclear. A better understanding is mainly hampered by the fact that the distance remains unknown. An overview of the current status of the distance problem is given by van Woerden elsewhere in this volume.

scholarly journals Neutral hydrogen gas within and around NGC 1316

2019 ◽  
Vol 628 ◽  
pp. A122 ◽  
Author(s):  
P. Serra ◽  
F. M. Maccagni ◽  
D. Kleiner ◽  
W. J. G. de Blok ◽  
J. H. van Gorkom ◽  
...  
Keyword(s):  
Large Scale ◽  
Molecular Form ◽  
Neutral Hydrogen ◽  
Hydrogen Gas ◽  
Neutral Gas ◽  
Tidal Forces ◽  
The Galaxy ◽  
Long Tails ◽  
Stellar Body ◽  
Fornax Cluster

We present MeerKAT observations of neutral hydrogen gas (H I) in the nearby merger remnant NGC 1316 (Fornax A), the brightest member of a galaxy group which is falling into the Fornax cluster. We find H I on a variety of scales, from the galaxy centre to its large-scale environment. For the first time we detect H I at large radii (70–150 kpc in projection), mostly distributed on two long tails associated with the galaxy. Gas in the tails dominates the H I mass of NGC 1316: 7 × 108 M⊙– 14 times more than in previous observations. The total H I mass is comparable to the amount of neutral gas found inside the stellar body, mostly in molecular form. The H I tails are associated with faint optical tidal features thought to be the remnant of a galaxy merger occurred a few billion years ago. They demonstrate that the merger was gas-rich. During the merger, tidal forces pulled some gas and stars out to large radii, where we now detect them in the form of optical tails and, thanks to our new data, H I tails; while torques caused the remaining gas to flow towards the centre of the remnant, where it was converted into molecular gas and fuelled the starburst revealed by the galaxy’s stellar populations. Several of the observed properties of NGC 1316 can be reproduced by a ∼10:1 merger between a dominant, gas-poor early-type galaxy and a smaller, gas-rich spiral occurred 1–3 Gyr ago, likely followed by subsequent accretion of satellite galaxies.

scholarly journals Optical Observations of four Balmer-Dominated Supernova Remnants in the Large Magellanic Cloud

1983 ◽  
Vol 101 ◽  
pp. 559-565
Author(s):  
I. R. Tuohy ◽  
M. A. Dopita ◽  
D. S. Mathewson ◽  
K. S. Long ◽  
D. J. Helfand
Keyword(s):  
Supernova Remnants ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Optical Observations ◽  
Type I ◽  
Radiative Shock ◽  
Neutral Gas ◽  
The Galaxy ◽  
Hα Emission ◽  
Very High

We report the optical identification of four Balmer-dominated supernova remnants (SNRs) in the Large Magellanic Cloud. Both the Balmer-dominated spectra and the presence of a broad Hα component in one remnant can be understood in terms of a very high velocity non-radiative shock encountering gas which is partially neutral, as proposed originally by Chevalier and Raymond to account for the similar spectra of the galactic remnants, Tycho and SN1006. From a consideration of the optical and X-ray luminosities of the SNR with broad Hα emission, we infer that the fraction of neutral gas in the medium is ≲ 30%. Radio observations of the LMC remnants show that their surface brightnesses are anomalously low; this could be intrinsic to the supernova themselves, or a result of their environment. Finally, we argue that the four SNRs all resulted from Type I supernovae, in which case they are the first such remnants to be identified outside the Galaxy.

scholarly journals Comparison of HI spiral pattern by optical structure of other galaxies

1964 ◽  
Vol 20 ◽  
pp. 88-91 ◽  
Author(s):  
G. de Vaucouleurs
Keyword(s):  
Blue Light ◽  
Classification Scheme ◽  
Neutral Hydrogen ◽  
Normal System ◽  
Spiral Pattern ◽  
Galaxy Type ◽  
The Galaxy ◽  
High Degree ◽  
Good Possibility ◽  
Optical Structure

I. The maps of the spiral pattern of neutral hydrogen in the outer and intermediate regions of the Galaxy resulting from the 21-cm studies at Leiden and Sydney may be compared with the optical structure of other galaxies. If, as seems probable, most hydrogen arms coincide with or follow closely the optical arms marked by the blue supergiant stars, a comparison of the HI pattern with photographs in blue light should be meaningful. Such a comparison may lead to the identification of the galaxy type to which our Galaxy belongs. The regularity and symmetry of the HI spiral pattern indicates that our Galaxy is a normal system, and one to which, in principle, a definite type in the revised classification scheme (de Vaucouleurs 1958, 1959) can be assigned. If this assignment can be made successfully it should assist in the interpretation of the radio observations of the inner regions. There is a good possibility of at least restricting the range of galaxy types consistent with the HI spiral pattern of the outer regions because there is a high degree of correlation between galaxy type and multiplicity of the spiral pattern.

Interstellar gas in the central region of the Galaxy

1967 ◽  
Vol 31 ◽  
pp. 239-251 ◽  
Author(s):  
F. J. Kerr
Keyword(s):  
Central Region ◽  
Galactic Plane ◽  
Neutral Hydrogen ◽  
Continuum Emission ◽  
Galactic Centre ◽  
Interstellar Gas ◽  
Hydrogen Recombination ◽  
The Galaxy ◽  
Centre Region ◽  
The Relationship

A review is given of information on the galactic-centre region obtained from recent observations of the 21-cm line from neutral hydrogen, the 18-cm group of OH lines, a hydrogen recombination line at 6 cm wavelength, and the continuum emission from ionized hydrogen.Both inward and outward motions are important in this region, in addition to rotation. Several types of observation indicate the presence of material in features inclined to the galactic plane. The relationship between the H and OH concentrations is not yet clear, but a rough picture of the central region can be proposed.

Cerebellotrigeminal Dermal Dysplasia (Gómez-López-Hernández Syndrome)

2018 ◽  
Vol 16 (05) ◽  
pp. 362-368 ◽  
Author(s):  
Federica Sullo ◽  
Agata Polizzi ◽  
Stefano Catanzaro ◽  
Selene Mantegna ◽  
Francesco Lacarrubba ◽  
...  
Keyword(s):  
De Novo ◽  
Chromosomal Rearrangements ◽  
Number Of Patients ◽  
Wide Range ◽  
Visual Problems ◽  
Neurodevelopmental Abnormalities ◽  
Clinical Triad ◽  
High Degree ◽  
Motor Handicap

Cerebellotrigeminal dermal (CTD) dysplasia is a rare neurocutaneous disorder characterized by a triad of symptoms: bilateral parieto-occipital alopecia, facial anesthesia in the trigeminal area, and rhombencephalosynapsis (RES), confirmed by cranial magnetic resonance imaging. CTD dysplasia is also known as Gómez-López-Hernández syndrome. So far, only 35 cases have been described with varying symptomatology. The etiology remains unknown. Either spontaneous dominant mutations or de novo chromosomal rearrangements have been proposed as possible explanations. In addition to its clinical triad of RES, parietal alopecia, and trigeminal anesthesia, CTD dysplasia is associated with a wide range of phenotypic and neurodevelopmental abnormalities.Treatment is symptomatic and includes physical rehabilitation, special education, dental care, and ocular protection against self-induced corneal trauma that causes ulcers and, later, corneal opacification. The prognosis is correlated to the mental development, motor handicap, corneal–facial anesthesia, and visual problems. Follow-up on a large number of patients with CTD dysplasia has never been reported and experience is limited to few cases to date. High degree of suspicion in a child presenting with characteristic alopecia and RES has a great importance in diagnosis of this syndrome.

Clinical and genetic analysis of KATP variants with heart failure risk in patients with decreased serum ApoA-I levels

2021 ◽  
Author(s):  
Cheng Liu ◽  
Yanxian Lai ◽  
Jingxian Pei ◽  
Huiling Huang ◽  
Junfang Zhan ◽  
...  
Keyword(s):  
Heart Failure ◽  
Potassium Channels ◽  
Vascular Reactivity ◽  
Expression Profiles ◽  
Channel Coupling ◽  
Lower Serum ◽  
Increased Risk ◽  
High Degree ◽  
Generation Sequencing

Abstract Context Lower serum concentration of apolipoprotein A-I (ApoA-I) is causally associated with heart failure (HF) risk. ATP-sensitive potassium channels (KATP), as a gating channel coupling vascular reactivity and metabolism with ischemic protection, become a new potential target of management for HF. The KATP gene sequence is highly polymorphic and high degree of genetic heterogeneity. Objective To determine whether ATP-sensitive potassium channels (KATP) variants predict the risks of decreased ApoA-I concentration and its related HF. Design, Patients, Settings A total of 634 subjects, including 317 subjects with decreased ApoA-I concentration (< 120 mg/dL) and 317 counterpart subjects (≥ 120 mg/dL), were retrospectively selected. Methods 5 KATP variants were genotyped through MassARRAY platform. The exosome-derived microRNAs (exo-miRs) expression profiles were identified by next-generation sequencing, and the top 10 DE exo-miRs were verified using qPCR in a validation cohort of 240 subjects with decreased ApoA-I concentration. Results KATP rs141294036 was related to increased risk of lower ApoA-I levels (adjusted OR=1.95, P=0.002) and HF incidence (adjusted OR=2.38, P=0.009), especially HFpEF (adjusted OR=2.13, P=0.015). After median 48.6-months follow-up, participants carrying CC genotype of rs141294036 was associated with elevated HF re-hospitalization risk (adjusted HR=1.91, P=0.005). 36 exo-miRs were significantly differentially expressed between different genotypes of rs141294036 in subjects with lower ApoA-I levels, but only 5 exo-miRs (miR-31-5p, miR-126-5p, miR-106a-5p, miR-378i and miR-181c-5p) were further confirmed. Conclusions The KATP rs141294036 was associated with increased risks of lower ApoA-I levels, HF incidence (especially HFpEF) and HF re-hospitalization, involving in those 5 confirmed exo-miRs and its related metabolic pathways.

Pediatrician Participation in Medicaid: 1978 to 1989

PEDIATRICS ◽  
1990 ◽  
Vol 85 (4) ◽  
pp. 567-577 ◽  
Author(s):  
Beth K. Yudkowsky ◽  
Jenifer D. C. Cartland ◽  
Samuel S. Flint
Keyword(s):  
Policy Options ◽  
Medicaid Program ◽  
Limited Participation ◽  
Medicaid Reimbursement ◽  
American Academy Of Pediatrics ◽  
Private Market ◽  
Medicaid Beneficiaries ◽  
High Degree ◽  
Medicaid Children

Optimal pediatrician participation in the Medicaid program is essential if the full benefits of recent eligibility expansions are to be realized. A 1989 national survey of the members of the American Academy of Pediatrics (n = 940), designed as a follow-up to similar studies conducted in 1978 and 1983, was an examination of the factors that influence pediatrician participation. Between 1978 and 1989: (1) basic participation (treating any Medicaid beneficiaries) declined to 77% from 85%; (2) limited participation (seeing only some Medicaid beneficiaries who request care) increased from 26% to 39.4%; and (3) extent of participation (the percentage of a pediatrician's patients who are Medicaid beneficiaries) increased from 15.7% to 19.4%. A dichotomous conceptualization of participation (restricted or unrestricted) was developed. By this definition, only 56% of pediatricians allowed comparable access to their practices for both Medicaid and private patients. Low reimbursement and slow payments discouraged participation. Medicaid reimbursement to pediatricians was approximately equal to their overhead costs. However, a high degree of willingness to care for Medicaid children remains if fees are increased to within 11% to 16% of the private market level. Policy options to enhance participation are discussed.

10 Years' Experience in Balanitis Xerotica Obliterans: A Single-Institution Study

2018 ◽  
Vol 29 (03) ◽  
pp. 302-306 ◽  
Author(s):  
Akhilesh Pradhan ◽  
Radhika Patel ◽  
A. Said ◽  
Manasvi Upadhyaya
Keyword(s):  
Average Duration ◽  
Age Group ◽  
Histological Findings ◽  
Single Institution ◽  
Exact Test ◽  
Balanitis Xerotica Obliterans ◽  
Tertiary Teaching ◽  
Tertiary Teaching Hospital ◽  
High Degree

Introduction Balanitis xerotica obliterans (BXO) is uncommon in children. Diagnosis of the condition is almost always clinical and supported by histology. Our aim was to evaluate the outcomes of children undergoing circumcision for BXO and explore the correlation between surgical and histological findings. Materials and Methods A 10-year retrospective review (2007–2017) of all children, aged 16 and less, undergoing circumcision at a tertiary teaching hospital was conducted. Statistical analysis was performed using Fisher's exact test. Results BXO occurred in 91/1025 (8.9%) children. The highest incidence of BXO was in the 5 to 10 age group (13.3%; p < 0.0001). The commonest symptom was foreskin scarring (62.6%). Intraoperatively, involvement of foreskin alone was seen in 26.4%, foreskin and meatus in 47.2%, and foreskin, meatus, and glans in 26.4%. Preoperatively, 24.2% of patients were prescribed steroid cream. Histologically, all patients showed microscopic changes confirming BXO. A total of 87.9% of patients only had a circumcision, and 11% required a meatal procedure along with the circumcision. Postoperatively, 19.8% of patients required a further procedure after an average duration of 5.8 months (range: 2–12 months); the majority of whom (83.3%) were prescribed postoperative steroid cream. Conclusion Clinical correlation by surgeons has a high degree of accuracy (>90%). Meatal involvement is more common than previously reported. The use of pre- or postoperative steroids does not obviate the need for further surgical procedures. Patients can have recurrent symptoms 1 year following surgery, and prolonged follow-up is necessary.

scholarly journals A Randomized Pilot Study Comparing the Efficacy of a Therapist-Delivered Motivational Interview to a Brief Computer-Delivered Intervention

2019 ◽  
Vol 8 (1) ◽  
pp. 29-36
Author(s):  
Lynn Hernandez ◽  
Mary Kathryn Cancilliere ◽  
Hannah Graves ◽  
Anthony Spirito
Keyword(s):  
Substance Use ◽  
Marijuana Use ◽  
Family Court ◽  
Adolescent Substance Use ◽  
Computer Assisted ◽  
Adolescent Substance ◽  
Significant Time ◽  
High Degree ◽  
Review Session

Aims: The purpose of this study was to compare the preliminary efficacy of a computer-assisted intervention (CAI), in which a computer-delivered intervention was immediately followed up with a brief therapist review session, to a therapist-delivered intervention (TDI) for adolescent substance use. Design, Setting, and Participants: Both conditions were examined in a pilot randomized clinical trial. All participants were recruited from a family court in the northeast United States. The sample included a total of 36 adolescents court-referred for an adolescent substance-related offense.Measures: Measures included adolescent alcohol and marijuana-use frequency, quantity, and problems as well as self-efficacy to resist the urge to use.Findings: While no significant time-by-condition differences were noted between the CAI and TDI conditions, significant time effects were found for both the TDI and CAI indicating a decrease in the total number of alcohol- or marijuana-use days over the six-month follow-up period.Conclusions: Given that CAIs are inexpensive, require minimal training, can be implemented with a high degree of fidelity, and are portable when compared to some TDIs, their use for decreasing substance use and related problems, particularly among adolescents with low access to substance-use interventions, seems promising. A fully powered trial of CAI efficacy is indicated.

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