262 research outputs found
IDL lib Baronchelli 1.0
No full textLibrary of useful Idl functions Ivano Baronchelli 2018
LIST: antiblooming2.pro cccpy.pro density_map5.pro double_gauss_fit.pro plotxyz.pro smearer.pro
antiblooming2.pro This program corrects astronomical images from blooming effects (saturation)
cccpy.pro This IDL program (calling a python function) can be used to match two catalogs using their RA and DEC positions. This progam is based on the same principles of cccpro.pro (Written by Mattia Vaccari), but the cccpy function works in a much more efficient (faster) way when using big catalogs (>100 thousand entries) Principle: This program writes a python program in a temporary file called "cccpy.py". The indexes and coordinates are passed from IDL to python and vice-versa through two temporary files: tmp0.txt and tmp1.txt. At the end of the process, all the temporary files are deleted.
density_map5.pro overplots (output file) a color density map, given an input list of x, y, datapoints
double_gauss_fit.pro Given the x and y values of an histogram (xhist, yhist), it finds the best fit for a double gaussian distribution trying different peak and sigma values.
plotxyz.pro This function works as an "oplot" function. Overimposed to the input x,y positions, it draws bigger (and color-scaled) circles for higher values of z.
smearer.pro It creates a set of x, y, z elements randomly distributed (gaussian) around an input list of x, y, z values
Multiwavelength analysis of high-redshift far-IR galaxies detected by the Herschel space observatory in the South ecliptic pole field
No full textIn the last years, more and more studies demonstrated the existence of a coevolution between active galactic nuclei and host galaxies. Starbursts are often accompanied by an enhanced nucleus activity and the physical properties of the two physical mechanisms seems to be correlated.
Given the dusty nature of the region in which such mechanisms take place, their direct observation is strongly affected by extinction. The hidden UV and optical emission has been for a long time a big limitation to these studies for both the difficulty in detecting a consistent fraction of such sources and for the estimation of their intrinsic emission. However, the energy absorbed at shorter wavelengths is re-emitted by the heated dust, in the mid and far infrared (MIR and FIR).
In this picture, the observations obtained with the Herschel and Spitzer space observatories play a major role. Exploring the spectral region spanning from the peak of stellar emission to the peak of dust emission, they allow to constrain the total amount of energy emitted by the underlying physical mechanisms and, consequently, their relative and absolute strength. Herschel and Spitzer observations are however necessary but not sufficient for these kind of studies. Reliable photometric redshifts can only be computed with a good spectra coverage at optical wavelengths. Moreover, when studying the AGN activity, keeping into account the mid-IR spectral region, where the dusty torus emission dominates, become crucial. The mid-IR spectral region can be explored, e.g. by the Akari space observatory
With the work summarized in this thesis, we contributed to the study of the connection between AGN and host galaxy under different aspects. Our analysis focuses on the south ecliptic pole (SEP) area, that given its position, is subject to a low cirrus emission. First, we reduced a large dataset of optical images taken in the SEP field. The resulting mosaics are now available for further studies both in the same and different topics. Second, starting from our optical images, and other pubblicly and private available images and catalogs, we built a multiwavelength catalog of sources covering 7 square degrees in the SEP area. The photometric coverage of this catalog spans from the optical to the far-IR of the Herschel-SPIRE bands. Spitzer-IRAC and MIPS bands, beside Akari-IRC observations are also included. This catalog is already available for the scientific community.
Our third contribution to the research in this field is represented by our analysis on a sub-sample of far-IR selected sources. Using SED fitting techniques, we analyzed the main properties of these galaxies (redshifts, stellar masses, star formation and AGN activity). Then we studied the contribution of each single physical mechanism (stars, AGN, star formation) to the total emission at different wavelengths. Finally we discussed the relations among these properties. Our multiwavelength results complement literature analysis undertaken in the X-rays, pointing toward the existence of a double ``main sequence'', one in the stellar mass (M*) versus SFR space and the other in the M* versus black hole accretion rate (BHAR) space. We conclude with the estimation of the M*-BHAR main sequence slope at z<0.5
Inter- vs. Intra-Speaker Variation in Mixed Heritage Syntax: A Statistical Analysis
No full textBased on the novel data pertaining to five syntactic phenomena (the position of the finite verb in embedded clauses, in sentences with a modal verb, negative concord, the position of focused light/heavy objects in main clauses with a complex tense and scrambling) in the heritage language Mòcheno collected via original fieldwork, we show that there are two populations – one exhibiting intra-speaker variation between German and Italian word orders, and one lacking it; and these two populations are the result of diatopic variation and, to a lesser extent, of diastratic variation.
The results achieved using quantitative statistical analysis are partially convergent with those arrived at via the traditional theoretical syntax for Mòcheno, but our analysis has allowed us to shed new light on a series of phenomena that have been neglected or poorly understood thus far. More specifically, and for the first time, we discovered that there is a micro-variation resulting from diastratic (age) variation within the Roveda variety, which represents the only case in Mòcheno in which age is a relevant factor in determining variation. We also show that the traditional claim that the Palù variety is ‘more German’ than is the other Mòcheno variety is to be confirmed; however, we could refine it by showing that German word orders are also accepted by speakers of other varieties and that the acceptability of these word orders in competition with the Italian syntax is not due to their age (no diastratic variation). Finally, we show that the acceptance of German word orders across speakers varies according to the phenomenon investigated: German word orders are more likely to be accepted in sentences featuring a negation, whereas German word orders are more likely to be rejected in embedded clauses. Based on this fine-grained description of the distribution of OV/VO word orders across different contexts and groups and the available theoretical account for the derivation of OV word order given by Cognola (2013 b), we propose that the observed variation can be parametrised along the lines of recent developments of Parameter Theory (Roberts 2012; Biberauer, Holmberg, Roberts & Sheehan 2014 a.o.). More specifically, we propose that the movement of the non-finite verb form to lowForce°, which is responsible for OV in Mòcheno, can be captured in terms of a parametric hierarchy. When verb movement takes place in all syntactic conditions, including with all non-finite verb forms and when the auxiliary has not moved out of v° to Spec,CP, a macroparametric effect obtains which corresponds to the system instantiated by the Palù variety. The mesoparameter corresponds to a system in which the movement to the non-finite verb form can only be found when v° is empty, i.e. in main declarative clauses. The fact that for a subgroup of speakers from Fierozzo and Roveda OV word order is accepted with modal verbs follows from a microparamter: the movement of the non-finite verb form to lowFocus° can only take place with non-finite verbs. Finally, the fact that OV is obligatory for nearly all groups is captured in terms of a nanoparamenter associated with negative constituents
Tecniche narrative nelle autobiografie italiane del Secondo Settecento
No full textThis Ph.D thesis analyses seven autobioraphies by italian writers, all born in in the Eighteenth century: Vittorio Alfieri, Carlo Goldoni, Lorenzo Da Ponte, Giacomo Casanova, Filippo Mazzei, Francesco Bal. It is divided in two parts: the first concerns with microtextuality aspects (incipit, explicit, dialogues, descriptions); the second deals with the macrotextuality ones (structures of time, structures of the plot). Besides evalutating in which ways the autobiographies organize their narration, the author compares them with Eighteenth Century italian novels and with other autobiographical works to see how much their structure is different
Identification of single spectral lines through machine learning
No full textThe Identification of redshifted spectral lines is unequivocal when multiple lines with high S/N ratios are detected. In these cases, the distances measured between each pair of lines represent the reference used for the identification.
However, when only one spectral line is detected, its identification becomes extremely difficult. This problem is particularly relevant, because it strongly limits the fraction of spectra exploitable in a scientific analysis.
We developed two machine learning algorithms that can be used to automatically classify single emission lines by exploiting ancillary observational data (e.g. apparent size, equivalent width, color indexes etc...).
We tested the algorithms on HST infrared data collected in the context of the WISP (WFC3 Infrared Spectroscopic Parallel) survey, obtaining a high level of precision.
This test is particularly relevant, since WISP represents one of the most important proxy of the future Euclid and WFIRST missions.
A relevant propery of the algorithms described is that they can be generalized to be used at different wavelengths (for example in the ALMA bands), or for the automatic classification of multiple lines but, more important, they can also address a very wide category of different questions (a statistical analysis in the field of linguistics is presented).
The development of such automated analyses is going to be crucial in the next future due to the exponentially increasing amount of data produced by upcoming facilities such as the SKA.</p
Identifying single spectral lines by combining different machine learning strategies
No full textThe future Euclid and WFIRST surveys will be covering a large portion of the extragalactic sky in near-IR slitless spectroscopy. A relevant fraction of the spectra collected will show only one emission line in the wavelength range covered. In order to maximize the scientific return of these missions, it is important that single emission lines are identified correctly. To this purpose, we developed and combined supervised and un-supervised machine learning algorithms. Our software is calibrated and tested on a ``gold'' sample selection of WISP data characerized by secure identifications. WISPs (WFC3 IR Spectroscopic Parallel survey) represents one of the most important proxies of the future Euclid and WFIRST surveys. We run the algorithm on a sample of WISP single line sources, identifying an originally missed class of sources characterized by small size and high [OIII]/Hα flux ratios flux ratios</p
Correlations between IR Luminosity, Star Formation Rate, and CO Luminosity in the Local Universe
No full textWe exploit the DustPedia sample of galaxies within approximately 40 Mpc, selecting 388 sources, to investigate the correlations between IR luminosity (LIR), the star formation rate (SFR), and the CO(1-0) luminosity (LCO) down to much lower luminosities than reached by previous analyses. We find a sub-linear dependence of the SFR on LIR. Below log(LIR/L⊙)≃10 or SFR≃1M⊙yr−1, the SFR/LIR ratio substantially exceeds the standard ratio for dust-enshrouded star formation, and the difference increases with decreasing LIR values. This implies that the effect of unobscured star formation overcomes that of dust heating by old stars, at variance with results based on the Planck ERCSC galaxy sample. We also find that the relations between the LCO and LIR or the SFR are consistent with those obtained at much higher luminosities
AUTHENTICITY CRITERIA IN CASTLES OF IVANO-FRANKIVSK REGION
No full text1- The information about castles can change during the time passing. It is important to verify what is authentic in the castles that are under research. 2-The author, based on the case studies about castles and after analyzing the best practices in Europe explores the verification of authenticity and define the fundamental criteria in conservation. Base of the found materials about castles in Ivano- Frankivsk region and taking into consideration the different interdisciplinary views on Conservation create a systematization of detected objects in Ivano – Frankivsk region by the time of their occurrence and the architectural and typological characteristics. It can help to define the authenticity criteria for Conservation of Castles in this area. 3- This criteria can help to define the method of preservation for each castle that was under this investigation. And set the authenticity criteria for Conservation of Castles in this region
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