The new Spanish Autonomous Communities fiscal stability framework

From to beginning of year 2002, the Spanish Autonomous Communities (CC. AA.) fiscal performance is conditioned by a new legal framework compounded from the financial agreement and the legislation on budget stability. This new framework implies a change in the CC. AA. fiscal behaviour. Are the CC. AA. ready to provide its citizens the public services they demand and fulfil its fiscal stability commitments? Are all the CC. AA. in the same position? Using political economic models and data on past budget execution, this paper is aimed at shedding light over the factors that jeopardize the CC. AA. budget stability in the future and the differences between CC. AA. relevant to its fiscal performance. JEL classification: H61, H62, H71, H72, H77

A New Method to Calibrate the Magnitudes of Type Ia Supernovae at Maximum Light

We present a new empirical method for fitting multicolor light curves of Type Ia supernovae. Our method combines elements from two widely used techniques in the literature: the delta_m15 template fitting method and the Multicolor Light-Curve Shape method. An advantage of our technique is the ease of adding new colors, templates, or parameters to the fitting procedure. We use a large sample of published light curves to calibrate the relations between the absolute magnitudes at maximum and delta_m15 in BVRI filters. We find that individual subsamples from a given survey or publication have significantly tighter relationships between light curve shape and luminosity than the relationship derived from the sum of all the samples, pointing to uncorrected systematic errors in the photometry, mainly in BV filters. Using our method, we calculate luminosity distances and host galaxy reddening to 89 SNe in the Hubble flow and construct a low-z Hubble diagram. The dispersion of the SNe in the Hubble diagram is 0.20 mag, or an error of ~9% in distance to a single SN. Our technique produces similar or smaller dispersion in the low-z Hubble diagram than other techniques in the literature.Comment: 43 pages, 16 figures, 6 tables, accepted by ApJ. For additional material go to http://www.astronomy.ohio-state.edu/~prieto/paper_dm15/dm15.htm

Type Ia Supernovae with Bi-Modal Explosions Are Common -- Possible Smoking Gun for Direct Collisions of White-Dwarfs

We discover clear doubly-peaked line profiles in 3 out of ~20 type Ia supernovae (SNe Ia) with high-quality nebular-phase spectra. The profiles are consistently present in three well-separated Co/Fe emission features. The two peaks are respectively blue-shifted and red-shifted relative to the host galaxies and are separated by ~5000 km/s. The doubly-peaked profiles directly reflect a bi-modal velocity distribution of the radioactive Ni56 in the ejecta that powers the emission of these SNe. Due to their random orientations, only a fraction of SNe with intrinsically bi-modal velocity distributions will appear as doubly-peaked spectra. Therefore SNe with intrinsic bi-modality are likely common, especially among the SNe in the low-luminosity part on the Philips relation (\Delta m15(B) >~ 1.3; ~40% of all SNe Ia). Such bi-modality is naturally expected from direct collisions of white dwarfs (WDs) due to the detonation of both WDs and is demonstrated in a 3D 0.64 M_Sun-0.64 M_Sun WD collision simulation. In the future, with a large sample of nebular spectra and a comprehensive set of numerical simulations, the collision model can be unambiguously tested as the primary channel for type Ia SNe, and the distribution of nebular line profiles will either be a smoking gun or rule it out.Comment: To be published by MNRAS Letters. Minor changes of the main text, an Appendix adde

Ten years of research on ResearchGate: a scoping review using Google Scholar (2008–2017)

Objective: To analyse quantitatively the articles published during 2008–2017 about the academic social networking site ResearchGate. Methods: A scoping bibliometric review of documents retrieved using Google Scholar was conducted, limitedto publications that contained the word ‘ResearchGate’ in their title and were published from 2008 to 2017. Results: The search yielded 159 documents, once a preliminary list of 386 documents retrieved from Google Scholar was filtered, which eliminated about 60% of the results that were bibliographic citations and not documents. Papers in journals were the most numerous type of documents (n = 73; 46%), followed by conference papers (n = 31; 19.5%). Contributing eight publications, two Spanish scholars (Delgado López-Cózar and OrduñaMalea, who were co-authors in each case) were the most prolific authors writing on this topic during the ten-year period. The keywords most used in the documents were ‘ResearchGate’ and ‘Altmetrics’. The publications were cited frequently since 2014 (more than 90% of the total cites fell in that period), and those with more than one author werethe most cited ones. The authors of the documents were mainly librarians and information science professionals, who wrote primarily as co-authors with colleagues from their own institutions, mostly published in English. Conclusions: Interest in ResearchGate has grown since 2015, as evident from the number of articles published and the citations they received. Keywords: Academic social networks, bibliometrics, scholarly communicatio