5 research outputs found
Star formation in CALIFA survey perturbed galaxies.III. Stellar & ionized-gas kinematic distributions
We obtain the kinematic distributions of stars (synthetic model line
absorption) and ionized gas (H line emission) for star-forming regions
residing in CALIFA survey tidally perturbed (perturbed) and non-tidally
perturbed (control) galaxies. We set the uncertainties of the velocity
dispersion by measuring the statistical variability of the datasets themselves.
Using these adopted uncertainties and considering the sensitivity of the
grating device, we establish thresholds of reliability that allow us to select
reliable velocity dispersions. From this selection, we pair the star-forming
spaxels between control and perturbed galaxies at the closest shifts in
velocity (de-redshifting). We compare their respective distributions of
velocity dispersion. In perturbed galaxies, median velocity dispersions for the
stellar and gaseous components are minimally higher and equal, respectively,
than those in control galaxies. The spread in velocity dispersion and the
velocity shift - velocity dispersion space agree with this result. Unlike the
well-known trend in strongly interacting systems, the stellar and ionized-gas
motions are not disturbed by the influence of close companions. For the gaseous
component, this result is due to the poor statistical variability of its data,
a consequence of the tightness in velocity dispersion derived from high
spectral line intensities. This analysis concludes the series, which previously
showed star-forming regions in galaxies with close companions undergoing more
prominent gas inflows, resulting in differences in their star formation and
consequent metal content
Star formation intensities of non-isolated galaxies with the CALIFA survey
Poster presented at the conference Galaxy Evolution Across Time, 12-16 June, Paris, France.
The influence of interactions on the star formation (SF) is investigated by studying a sample of 34 CALIFA survey non-isolated galaxies. We use the instantaneous star formation rate intensity (SFRI) obtained from the Halpha recombination line emission normalized by a unit of projected area. We explore the SFRI, stellar mass and stellar age annulus structures (split by morphology group), also for a control population of star-forming isolated galaxies observed with the CALIFA survey likewise. By morphology groups, the SF efficiency of early type spirals (ETSs) results magnified likely because of angular momentum loss. The SFRI of the non-isolated sample is then compared with that one of the isolated sample. It is found statistically and moderately enhanced in the non-isolated sample by a factor of at most 2. We also find the SFRI as to be a function of the degree of tidal perturbation what might consequently suggest interactions as to facilitate the gas transport to central regions. Contrasting behaviors of the SFRI structures, a gradual quench with clear outer presence of SF (isolated sample) while a steeper decrease from the center with poor SFRIs outwards (non-isolated one) are found. Similitudes in a variety of stellar population properties support the closeness of companions as to be the cause of the SFRI differences between samples
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The Telescopio San Pedro Mártir project
The Telescopio San Pedro Martir project intends to construct a 6.5m telescope to be installed at the Observatorio Astronomico Nacional in the Sierra San Pedro Martir in northern Baja California, Mexico. The project is an association of Mexican institutions, lead by the Instituto Nacional de Astrofisica,Optica y Electronica and UNAM's Instituto de Astronomia, in partnership with the Smithsonian Astrophysical Observatory and the University of Arizona's Department of Astronomy and Steward Observatory. The project is advancing through the design stage, having completed five design reviews of different subsystems in 2016 and 2017 (enclosure and services: PDR, CDR; optical design: PDR; optics: progress review; telescope: PDR). Once completed, the partners plan to operate the MMT and TSPM as a binational astrophysical observatory.Mexico by the IA-UNAM; INAOE; Consejo Nacional de Ciencia y Tecnologia [LN 127736, LN 232649, LN 260369, LN 271117, LN 280035, 224003, 264173, 272027, 279517, 293074]; Agencia Espacial Mexicana [248500]This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]