bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ground-state OH maser distributions in the Galactic Centre region
Authors: Qiao Hai-Hua , Walsh Andrew J. , Shen Zhi-Qiang , Dawson Joanne R. 
Published: February 2017

AbstractGround-state OH masers identified in the Southern Parkes Large-Area Survey in Hydroxyl were observed with the Australia Telescope Compact Array to obtain positions with high accuracy (~1 arcsec). We classified these OH masers into evolved star OH maser sites, star formation OH maser sites, supernova remnant OH maser sites, planetary nebula OH maser sites and unknown maser sites using their accurate positions. Evolved star and star formation OH maser sites in the Galactic Centre region (between Galactic longitudes of −5° to +5° and Galactic latitudes of −2° and +2°) were studied in detail to understand their distributions.
PDR Emission from the Arched-Filaments and Nearby Positions
Authors: García Pablo , Röllig Markus , Abel Nicholas , Steinke Martin , Burton Michael , Blackwell Rebecca 
Published: February 2017

AbstractWe investigate the physical conditions of the gas, atomic and molecular, in the filaments in the context of Photo-Dissociation Regions (PDRs) using the KOSMA-PDR mode of clumpy clouds. We also compare the [CII] vs. [NII] integrated intensity predictions in Abel et al. 2005 for HII regions and adjacent PDRs in the Galactic disk, and check for their applicability under the extreme physical conditions present in the GC. Our preliminary results show that observed integrated intensities are well reproduced by the PDR model. The gas is exposed to a relatively low Far-UV field between 102 – 103 Draine fields. The total volume hydrogen density is well constrained between 104 – 105 cm−3. The hydrogen ionization rate due to cosmic-rays varies between 10−15 and 4× 10−15 s−1, with the highest value ~ 10−14 s−1 found towards G0.07+0.04. Our results show that the line-of-sight contribution to the total distance of the filaments to the Arches Cluster is not negligible. The spatial distribution of the [CII]/[NII] ratio shows that the integrated intensity ratios are fairly homogeneously distributed for values below 10 in energy units. Calculations including variation on the [C/N] abundance ratio show that tight constraints on this ratio are needed to reproduce the observations.
Star formation in a high-pressure environment: An SMA view of the dust ridge
Authors: Walker Daniel L. ,   CMZoom Survey Group (PIs: Eric Keto & Cara Battersby)
Published: February 2017

AbstractThe star formation rate in the Central Molecular Zone is an order of magnitude lower than in the disk of the Galaxy, given the amount of dense gas there. Understanding why star formation is different in this region is crucial if we are to understand the environmental dependence of star formation. Here, we present the detection of high-mass cores in the CMZ’s ‘dust ridge’ that have been discovered with the Submillimeter Array. These cores range in mass from ~ 50 – 1800 M⊙ within radii of 0.1 – 0.25 pc. All are young (pre-UCHII), meaning that they are prime candidates for representing the initial conditions of high-mass stars and sub-clusters. We compare these with high-mass cores and clouds in the Galactic disk and find that they are very similar in terms of their masses and sizes, despite being subjected to external pressures that are several magnitudes greater (~ 108 K cm−3). The fact that > 80% of these cores do not show any signs of star-forming activity in such a high-pressure environment leads us to conclude that this is further evidence of the critical density for star formation being heightened in the CMZ due to turbulence.
Constraining the Variability and Binary Fraction of Galactic Center Young Stars
Authors: Gautam Abhimat K. , Do Tuan , Ghez Andrea M. , Lu Jessica R. , Morris Mark R. , Sakai Shoko , Witzel Gunther , Sitarski Breann N. , Chappell Samantha 
Published: February 2017

AbstractWe present constraints on the variability and binarity of young stars in the central 10 arcseconds (~ 0.4 pc) of the Milky Way Galactic Center (GC) using Keck Adaptive Optics data over a 12 year baseline. Given our experiment’s photometric uncertainties, at least 36% of our sample’s known early-type stars are variable. We identified eclipsing binary systems by searching for periodic variability. In our sample of spectroscopically confirmed and likely early-type stars, we detected the two previously discovered GC eclipsing binary systems. We derived the likely binary fraction of main sequence, early-type stars at the GC via Monte Carlo simulations of eclipsing binary systems, and find that it is at least 32% with 90% confidence.
Mopra Central Molecular Zone Carbon Monoxide Survey Status
Authors: Blackwell Rebecca , Burton Michael , Rowell Gavin 
Published: February 2017

AbstractWe present an update on the Mopra Central Molecular Zone Carbon Monoxide (CO) survey, with data taken in 2016 extending the original 3.5° ≥ l ≥ 358.5°, +1.0° ≥ b ≥ -0.5° to 4.0° ≥ l ≥ 358.0°, +1.0° ≥ b ≥ -1.0°. Using the four simultaneously observed lines of 12CO, 13CO, C18O, and C17O Nyquist sampled at 0.6′ spatial and 0.1 km/s spectral resolution, we are building an optical-thickness-corrected three-dimensional model of the diffuse gas, and making cloud mass estimates. This data, as part of the Mopra Southern Galactic Plane CO Survey (Braiding et al. (2015), Burton et al. (2013)), is at the highest resolution available across such a widespread region, and includes the Sagittarius A, Sagittarius B2, Sagittarius C, and G1.3 cloud complexes, as well as Bania’s Clump 2.
An X-ray view of Sagittarius C
Authors: Chuard D. , Terrier R. , Goldwurm A. , Clavel M. , Soldi S. , Ponti G. , Morris M. R. , Jin C. 
Published: February 2017

AbstractOver the past 15 years, the molecular complex Sgr C has been repeatedly observed with both XMM-Newton and Chandra. These observations reveal new features indicating that the region might be more complex than previously thought. We find that its strong iron line emission at 6.4 keV varies significantly over time, which supports the X-ray reflection scenario.
VLBI astrometry toward Sgr D HII region with VERA
Authors: Sakai Daisuke , Oyama Tomoaki , Nagayama Takumi , Honma Mareki , Kobayashi Hideyuki 
Published: February 2017

AbstractThe Galactic centre region shows outstanding non-circular motion unlike the Galactic disk. As scenarios describing this non-circular motion, resonance orbits formed by the Galactic bar potential or expanding motion by past activity of the central BH are proposed. However, these both scenarios are based on line-of-sight velocities of molecular clouds in this region, and such one-dimension velocity information is insufficient to separate these scenarios.To reveal dynamics of the Galactic centre region, we conducted astromertic observations of 22 GHz water maser sources toward the Galactic centre direction. We conducted astrometric observations toward water maser source associated with Sgr D HII region. As a result, we succeeded to measure the parallax and proper motion of the maser source. The measured distance was 2.36(+0.58/-0.39) kpc. This result clearly indicates that this source is not associated with the Galactic centre, but located on the Galactic disk.
Sgr A* as Source of the Positrons Observed in the Galactic Center Region
Authors: Jean Pierre , Guessoum Nidhal , Ferrière Katia 
Published: February 2017

AbstractWe explore the possibility that a substantial fraction of the positrons observed to annihilate in the central region of our Galaxy come from the supermassive black hole Sgr A* that lies at the center. This idea was proposed by several authors, but the propagation of the emitted positrons into the bulge and beyond remained a serious problem for models of the origin of GC positrons.We assume models of positron production with different energies. The propagation of positrons from their production site is followed in detail with Monte-Carlo simulations, taking into account the physical conditions of the propagation regions as well as various physical interactions. Using the known physics of positron annihilation in astrophysical environments, we calculate the properties of the annihilation emission (time evolution and spatial distribution) for the different models under consideration.We present the results of these simulations and the conclusions/constraints that can be inferred from them.
Towards a multi-scale understanding of the gas-star formation cycle in the Central Molecular Zone
Authors: Kruijssen J. M. Diederik 
Published: February 2017

AbstractThe Central Molecular Zone (CMZ, the central 500 pc of the Milky Way) contains the largest reservoir of high-density molecular gas in the Galaxy, but forms stars at a rate 10–100 times below commonly-used star formation relations. We discuss recent efforts in understanding how the nearest galactic nucleus forms its stars. The latest models of the gas inflow, star formation, and feedback duty cycle reproduce the main observable features of the CMZ, showing that star formation is episodic and that the CMZ currently resides at a star formation minimum. Using orbital modelling, we derive the three-dimensional geometry of the CMZ and show how the orbital dynamics and the star formation potential of the gas are closely coupled. We discuss how this coupling reveals the physics of star formation and feedback under the conditions seen in high-redshift galaxies, and promotes the formation of the densest stellar clusters in the Galaxy.
Molecular material in the Bubble of the Galactic Center
Authors: Torres Miguel Angel Requena , Noriega-Crespo Alberto 
Published: February 2017

AbstractThe Galactic Center (GC) is one of the more extreme environments in the Galaxy. The so call Bubble of the GC presents structures that do not match with the general behavior of the inner Central Molecular Zone (CMZ). In this work we study the molecular emission related to the observable ionized gas emitted by this Bubble. We find dense pockets of gas and bubble like structures in the velocity domain.
Observational constraints on the formation and evolution of the Milky Way nuclear star cluster with Keck and Gemini
Authors: Do Tuan , Ghez Andrea , Morris Mark , Lu Jessica , Chappell Samantha , Feldmeier-Krause Anja , Kerzendorf Wolfgang , Martinez Gregory David , Murray Norm , Winsor Nathan 
Published: February 2017

AbstractWe summarize work on the central parsec of the Galactic center based on imaging and spectroscopic observations at the Keck and Gemini telescopes. These observations include stellar positions in two dimension and the velocity in three dimensions. Spectroscopic observations also enables measurements of the physical properties of individual stars, such as the spectral type and in some cases the effective temperature, metallicity, and surface gravity. These observations show a complex stellar population with a young (4-6 Myr) compact star cluster in the central 0.5 pc embedded in in an older and much more massive nuclear star cluster. Surprisingly, the old late-type giants do not show a cusp profile as long been expected from theoretical work. The majority of the stars have higher than solar metallicity, with only about 6% of the stars having [M/Fe] < −0.5, which is consistent with an origin from the MW disk.
Modelling the thermal X-ray emission around the Galactic centre from colliding Wolf-Rayet winds
Authors: Russell Christopher M. P. , Wang Q. Daniel , Cuadra Jorge 
Published: February 2017

AbstractThe Galactic centre is a hotbed of astrophysical activity, with the injection of wind material from ~30 massive Wolf-Rayet (WR) stars orbiting within 12″ of the super-massive black hole (SMBH) playing an important role. Hydrodynamic simulations of such colliding and accreting winds produce a complex density and temperature structure of cold wind material shocking with the ambient medium, creating a large reservoir of hot, X-ray-emitting gas. This work aims to confront the 3Ms of Chandra X-ray Visionary Program (XVP) observations of this diffuse emission by computing the X-ray emission from these hydrodynamic simulations of the colliding WR winds, amid exploring a variety of SMBH feedback mechanisms. The major success of the model is that it reproduces the spectral shape from the 2″–5″ ring around the SMBH, where most of the stellar wind material that is ultimately captured by Sgr A* is shock-heated and thermalised. This naturally explains that the hot gas comes from colliding WR winds, and that the wind speeds of these stars are in general well constrained. The flux level of these spectra, as well as 12″×12″ images of 4–9 keV, show the X-ray flux is tied to the SMBH feedback strength; stronger feedback clears out more hot gas, thereby decreasing the thermal X-ray emission. The model in which Sgr A* produced an intermediate-strength outflow during the last few centuries best matches the observations to within about 10%, showing SMBH feedback is required to interpret the X-ray emission in this region.
3D AMR simulations of the evolution of the diffuse gas cloud G2 in the Galactic Centre
Authors: Schartmann M. , Ballone A. , Burkert A. , Gillessen S. , Genzel R. , Pfuhl O. , Eisenhauer F. , Plewa P.M. , Ott T. , George E.M. , Habibi M. 
Published: February 2017

AbstractWith the help of 3D AMR hydrodynamical simulations we aim at understanding G2’s nature, recent evolution and fate in the coming years. By exploring the possible parameter space of the diffuse cloud scenario, we find that a starting point within the disc of young stars is favoured by the observations, which may hint at G2 being the result of stellar wind interactions.
Tadmor’s Ghosts
Authors: cooke miriam 
Published: February 2017

“You shall not escape us even while you sleep. Your victims’ vengeance will pursue you for blood… Even if you muzzle their complaints they will haunt you even as ghosts… You have poisoned the life of the people, wounded their souls… Wisdom at all times Is to destroy the jail Not to cut off the hand of the jailor. We have completed our little duty From now on we shall begin our great duty: This tyranny shall never recur” (Mamduh Adwan, The Ghoul 1995)Mamduh Adwan (1941-2005) was right eighteen years ago. The people whose lives Hafiz al-Assad had poisoned and whose souls he had wounded would pursue his son for blood. Decades of living with walls that are—not have—ears have produced rage and a demand for vengeance and justice: “From now on we shall begin our great duty: This tyranny shall never recur.” These lines call for revolution. It is not enough to cut off the hand of the jailor. The jail must be destroyed.
Autonomy, Coping Strategies and Psychological Well-Being in Young Professional Tennis Players
Authors: Romero Carrasco Alicia Elena , Campbell Rolando Zapata , López Alejandra Letelier , Poblete Ixa López , García-Mas Alexandre 
Published: February 2017

AbstractThis research aimed to analyze the role of Psychological Well-being factors in young professional tennis players, assigning special attention to their preferred coping strategies and perceived autonomy that specifically contribute to Psychological Well-being. The conceptual framework utilized for this study was Ryff’s Psychological Well-being multidimensional model in order to focus our understanding towards how environment demands of professional sport affect athletes Psychological Well-being. Participants were 155 male professional tennis players with a mean age of 14.61 (SD = 1.86) engaged in South American Tennis Federation tournaments. Instruments utilized were Psychological Well Being Scale EBP, Díaz et al., 2006, Sport Coping Approach Questionnary Spanish version, ACSQ-1 (Kim, Duda, Tomas, & Balaguer, 2003) and Sport Perceived Autonomy Scale, Spanish version (Balaguer, Castillo, & Duda, 2008). Our research revealed that the greater autonomy young athletes perceive while being engaged in professional sport was because of the coping strategies they utilized such as active planning, cognitive restructuring, emotional calmness and seeking of social support. Results confirmed also that the greater perceived autonomy was explaining athletes high levels of Psychological Well-being.
Less Time, Better Quality. Shortening Questionnaires to Assess Team Environment and Goal Orientation
Authors: Alcaraz Saül , Viladrich Carme , Torregrosa Miquel 
Published: February 2017

AbstractWhen assessing team environments in youth sport, participants often spend substantial time responding to lots of items in questionnaires, causing a lack of efficiency (i.e. time and effort) and a decrease of data quality. The purpose of this work was to create short-forms of the questionnaires PeerMCYSQ, SCQPeer, TEOSQ, and also to analyse the existing short-form of the SCQCoach. In Study 1 we developed the short-forms of the instruments. We shortened the questionnaires by using both theory driven and data-driven criteria. In Study 2, we used also qualitative and quantitative data with the aim of validating the short-forms. Finally, in Study 3 we tested the last version of the short-forms and sought evidences concerning their criterion validity. The results showed evidence that supports the psychometric merit of these short-forms: (a) significantly less missing values were obtained; (b) all the factors obtained alpha values above .70; (c) confirmatory factor analyses demonstrated that the short-forms fitted the hypothesized models well; (d) correlations between variables were coherent with expectations, and (e) structural equation modeling results showed significant paths consistent with previous literature. On average, our participants only spent a third of the time used to complete the original questionnaires.
A Cluster Analysis on Students’ Perceived Motivational
Climate. Implications on Psycho-Social Variables
Authors: Fernandez-Rio Javier , Méndez-Giménez Antonio , Cecchini Estrada Jose A. 
Published: February 2017

AbstractThe aim of this study was to examine how students’ perceptions of the
class climate influence their basic psychological needs, motivational
regulations, social goals and outcomes such as boredom, enjoyment, effort, and
pressure/tension. 507 (267 males, 240 females) secondary education students
agreed to participate. They completed a questionnaire that included the Spanish
validated versions of Perceived Motivational Climate in Sport Questionnaire
(PMCSQ-2), Basic Psychological Needs in Exercise (BPNES), Perceived Locus of
Causality (PLOC), Social Goal Scale-Physical Education (SGS-PE), and several
subscales of the IMI. A hierarchical cluster analysis uncovered four independent
class climate profiles that were confirmed by a K-Means cluster analysis:
“high ego”, “low ego-task”,
“high ego-medium task”, and “high
task”. Several MANOVAs were performed using these clusters as
independent variables and the different outcomes as dependent variables
(p < .01). Results linked high mastery class
climates to positive consequences such as higher students’ autonomy,
competence, relatedness, intrinsic motivation, effort, enjoyment, responsibility
and relationship, as well as low levels of amotivation, boredom and
pressure/tension. Students’ perceptions of a performance class
climate made the positive scores decrease significantly. Cluster 3 revealed that
a mastery oriented class structure undermines the negative behavioral and
psychological effects of a performance class climate. This finding supports the
buffering hypothesis of the achievement goal theory.
Is Underweight Associated with more Positive Body Image? Results of a Cross-Sectional Study in Adolescent Girls and Boys
Authors: Kantanista Adam , Król-Zielińska Magdalena , Borowiec Joanna , Osiński Wiesław 
Published: February 2017

AbstractThe aim of the study was to investigate the relationship between body image and prevalence of underweight, normal weight, and overweight in adolescents. The study included 1702 girls and 1547 boys, aged 14–16 years, who completed questionnaire assessing body satisfaction. The participants’ BMI status: underweight, normal weight or overweight was determined on the basis of BMI cut-off values. Results revealed that more girls (p < .001) showed low body satisfaction (44.8%) and fewer girls (p < .001) had high body satisfaction (17.6%) compared to boys (28.5% and 29.0%, respectively). A two-way ANOVA revealed a significant interaction between BMI status and gender on body satisfaction F(2, 3243) = 4.10, p = .017, η2 = .003. In boys, body satisfaction was higher in normal weight and underweight in comparison to overweight individuals (p < .001). Underweight girls presented higher body satisfaction than those who were normal weight and overweight (p < .001). Our findings indicated that, in relation to gender, BMI status can be associated with different body satisfaction in adolescents. This should be taken into consideration when designing programs aimed at obesity and disordered eating prevention and body image improvement. Due to the fact that underweight girls and boys have high body satisfaction, this can lead to behaviors that maintain low body weight in adolescents and in turn this may have negative health consequences.
Big Five Personality Trait Short Questionnaire: Preliminary Validation with Spanish Adults
Authors: Ortet Generós , Martínez Tania , Mezquita Laura , Morizot Julien , Ibáñez Manuel I. 
Published: February 2017

AbstractThere are two major advantages of the Big Five Personality Trait Short Questionnaire (BFPTSQ) over other non-commercial short Five-Factor Model personality measures: widen conceptual breadth, and its use in both adolescents and adults. The aim of this study was to explore the psychometric properties of this questionnaire in an adult Spanish sample. Factor, convergent (using the NEO-PI-R), and criterion (using scales that assess happiness and alcohol consumption) validities, internal consistency as well as test-retest reliabilities of the BFPTSQ were evaluated. The sample was composed of 262 participants; a subsample of 71 individuals also answered the NEO-PI-R, and another subsample of 42 respondents filled the BFPTSQ out again a month later. The results indicated that the expected factor structure was recovered using exploratory structural equation modeling (ESEM). The ESEM showed satisfactory fit indices, with CFI and TLI around .90, as well as RMSEA and SRMR below .06. Moreover, coefficient alphas ranged from .75 to .85 and test-retest correlations ranged from .72 to .93 (p < .001). Regarding the associations of BFPTSQ with NEO-PI-R scales, the correlations with the broad-trait scales ranged from .57 to .80 (p < .001), and 27 out of 30 correlations with the facet scales were significant (p < .05 or lower). We also found that extraversion and emotional stability were associated with subjective well-being (p < .001), and extraversion and conscientiousness were related to alcohol consumption (p < .01). This study supports the construct validity of the Spanish version of the BFPTSQ in adults.