769 research outputs found
Central Stellar Populations of S0 Galaxies in The Fornax Cluster
Based on FORS2-VLT long-slit spectroscopy, the analysis of the central
absorption line indices of 9 S0 galaxies in the Fornax Cluster is presented.
Central indices correlate with central velocity dispersions as observed in
ellipticals. However, the stellar population properties of these S0s indicates
that the observed trends are produced by relative differences in age and
alpha-element abundances and not in metallicity ([Fe/H]) as previous studies
have found in elliptical galaxies. The observed scatter in the line indices vs.
velocity dispersion relations can be partially explained by the
rotationally-supported nature of many of these systems. The presence of tighter
line indices vs. maximum (circular) rotational velocity relations confirms this
statement. It was also confirmed that the dynamical mass is the driving
physical property of all these correlations and in our Fornax S0s it has to be
estimated assuming rotational support.Comment: To appear in the Proceedings of IAU Symposium 241: "Stellar
Populations as Building Blocks of Galaxies", 10-16 December, 2006 at La
Palma, Canary Islands, Spai
Four new species of Acalypha L. (Euphorbiaceae, Acalyphoideae) from Madagascar, with notes about their conservation status
Marisa, dejo sin poner identificadores de proyecto porque en CORDIS no he logrado encontrar dos de los que se trata en el Funding. Faltan dĂgitos, la informaciĂłn que aporta creo que es incompleta. Llevo mucho tiempo buscando y no encuentro nada.Yo, Estrella, tampoco he encontrado esos identificadores en Cordis y tambiĂ©n los he buscado por el nombre de proyecto que aparece en el fundingFour new species of Acalypha, subgen. Acalypha (Euphorbiaceae, Acalyphoideae) from Madagascar are described, illustrated, and mapped. Acalypha ankaranensis sp. nov. is found in the Anakarana massif, in a dry deciduous forest at 180 m elevation; A. cardielii sp. nov. in the Tsingy de Bemaraha, also associate to dry deciduous forest, at 360 m elevation; A. magistri sp. nov. in the Marojejy Natural Reserve, in evergreen moist forest at 1583 m elevation, and A. levinii sp. nov. in the southern sclerophyllous woodland between 140 to 990 m elevation. These new species are quite well characterized morphologically and ecologically and are easily differentiated from morphologically similar ones. A. ankaranensis and A. levinii are most similar to A. paxii Aug.DC., a common species in northern Magdagascar, A. cardielii is close to A. leptomyura Baill, and A. magistri is close to A. chibomboa Baill. According to our preliminary conservation assessments, A. ankaranensis and A. cardielii are Critically Endangered, A. levinii is Endangered, and A. magistri is VulnerableThis research has received support from the SYNTHESYS Project (http://www.synthesys.info/; FR-TAF 6307) financed by European Community Research Infrastructure Action under the FP7 "Capaci ties" Program; also from the European Molecular Biology Organiza tion (https://www.embo.org; STF-8222). We kindly thank the curators and staff of the herbaria mentioned for facilitating the study of their specimens, and Laura Gonzalez Hern andez, author of the excellent illustrations included in this work. Finally, our gratitude to Louis Nusbaumer, and the anonymous reviewers, that have helped us to improve the submitted manuscrip
Four new species of Acalypha L. (Euphorbiaceae, Acalyphoideae) from the West Indian Ocean Region
Four new species of Acalypha (Euphorbiaceae, Acalyphoideae) from the Western Indian Ocean Region, based on morphological and molecular evidence, are described, illustrated, and mapped. Acalypha gillespieae sp. nov., A. leandrii sp. nov. and A. nusbaumeri sp. nov. are endemic to Madagascar, and A. mayottensis sp. nov. is known only from Mbouzi islet (Mayotte), in the Comoros Archipelago. We also describe for the first time in Acalypha the presence of membranous or chartaceous perules covering the axillary buds. Preliminary conservation assessments of the new species are also providedThis research received support from the SYNTHESYS Project (http://www.synthesys.
info/; FR-TAF 6307, DE-TAF 3319, and SE-TAF 5590) financed by European Community Research Infrastructure Action under the FP7 âCapacitiesâ Program, the European Molecular Biology Organization (https://www.embo.org; STF-8222), and the
United States National Science Foundation (DEB-0128872
Evolution of the anti-truncated stellar profiles of S0 galaxies since in the SHARDS survey: I - Sample and Methods
The controversy about the origin of the structure of S0--E/S0 galaxies may be
due to the difficulty of comparing surface brightness profiles with different
depths, photometric corrections and PSF effects (almost always ignored). We aim
to quantify the properties of Type-III (anti-truncated) discs in a sample of S0
galaxies at 0.2<z<0.6. In this paper, we present the sample selection and
describe in detail the methods to robustly trace the structure in their
outskirts and correct for PSF effects. We have selected and classified a sample
of 150 quiescent galaxies at 0.2<z<0.6 in the GOODS-N field. We perform a
quantitative structural analysis of 44 S0-E/S0 galaxies. We corrected their
surface brightness profiles for PSF distortions and analysed the biases in the
structural and photometric parameters when the PSF correction is not applied.
Additionally, we have developed Elbow, an automatic statistical method to
determine whether a possible break is significant - or not - and its type and
made it publicly available. We found 14 anti-truncated S0-E/S0 galaxies in the
range 0.2<z<0.6 (~30% of the final sample). This fraction is similar to the
those reported in the local Universe. In our sample, ~25% of the Type-III
breaks observed in PSF-uncorrected profiles are artifacts, and their profiles
turn into a Type I after PSF correction. PSF effects also soften Type-II
profiles. We found that the profiles of Type-I S0 and E/S0 galaxies of our
sample are compatible with the inner profiles of the Type-III, in contrast with
the outer profiles. We have obtained the first robust and reliable sample of 14
anti-truncated S0--E/S0 galaxies beyond the local Universe, in the range
0.2<z<0.6. PSF effects significantly affect the shape of the surface brightness
profiles in galaxy discs even in the case of the narrow PSF of HST/ACS images,
so future studies on the subject should make an effort to correct them.Comment: Accepted for publishing in Astronomy & Astrophysics. 75 pages, 57
figure
Adapting the revised prenatal coping inventory (NuPCI) for use in a Spanish population
Objective: To adapt the Revised Prenatal Coping Inventory (NuPCI) for the evaluation of prenatal stress coping strategies utilised by Spanish women. Methods: A cross-sectional study was performed to evaluate the psychometric properties of NuPCI adapted for a Spanish population. Two hundred and sixty one puerperium women completed the NuPCI at the time of discharge after childbirth. Instrument construct validity was evaluated using subscale item correlations. Internal consistency was assessed using Cronbachâs a test. Results: Items from each subscale (Preparation, Avoidance and Spiritual â Positive Coping) were significantly correlated with the global result (p¿¿0.7). The most frequently used coping strategy was Preparation and the least used was Avoidance. Utilisation of the coping strategies with Preparation decreased with increasing parity (pÂż=Âż.002) and greater prenatal stress was associated with increased use of the Avoidance coping strategy (pÂż<Âż.001). Conclusions: The NuPCI adapted for Spanish women demonstrates good psychometric properties for evaluating the three types of prenatal stress coping strategies: Preparation, Avoidance and Spiritual â Positive Coping. Results were similar to those presented by the instrument in its English language version
Morphologies and stellar populations of galaxies in the core of Abell 2218
SUMMARIZED ABSTRACT:
We present a study of the stellar populations and morphologies of galaxies in
the core of the galaxy cluster Abell 2218. Integral field spectroscopy was
obtained using PMAS/[email protected] CAHA to obtain a complete flux limited sample of
cluster members within its field-of-view (~74"X64"). In addition of 31 galaxies
with known redshifts in the outer regions, we built up a final sample of 59
spectroscopically confirmed cluster members. Multiban photometry and detailed
morphologies were obtained using deep images taken with the HST/ACS camera in
the BVRI and z-bands. The CM diagram shows that the E-type galaxies cover the
range of brighter and redder colors. A large fraction of spiral galaxies
(50%) is found. They cover a wide range in colors. This result, together
with the distributions of ages, metallicities and masses, indicates that E-type
galaxies are more massive and have older stellar populations, while L-type
galaxies are less massive and have a wider range of stellar Our results agree
with a proposed two-step scenario for the evolution of galaxies in clusters. In
addition, an extremely blue merging galaxy system is found at the core, with
the nominal redshift of the cluster.Comment: 29 pages, 17 figures, accepted for publishing in MNRAS. (HST/ACS
composite image: http://www.caha.es/sanchez/abell2218/BRI_big.jpg
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