Search results for "Sky"

A new sample of large angular size radio galaxies I. The radio data

2001

We present a new sample of 84 large angular size radio galaxies selected from the NRAO VLA Sky Survey. Radio sources with declination above +60 degrees, total flux density greater than 100 mJy at 1.4 GHz and angular size larger than 4 arcmin have been selected and observed with the VLA at 1.4 and 4.9 GHz. The radio observations attempt to confirm the large angular size sources and to isolate the core emission for optical identification. In this paper, the first of a series of three, we present radio maps of 79 sources from the sample and discuss the effects of the selection criteria in the final sample. 37 radio galaxies belong to the class of giants, of which 22 are reported in this paper …

The broad-line radio galaxy J2114+820

1998

In the frame of the study of a new sample of large angular size radio galaxies selected from the NRAO VLA Sky Survey, we have made radio observations of J2114+820, a low power radio galaxy with an angular size of 6'. Its radio structure basically consists of a prominent core, a jet directed in north-west direction and two extended S-shaped lobes. We have also observed the optical counterpart of J2114+820, a bright elliptical galaxy with a strong unresolved central component. The optical spectrum shows broad emission lines. This fact, together with its low radio power and FR-I type morphology, renders J2114+820 a non-trivial object from the point of view of the current unification schemes of…

Three Peculiar Objects From a New Sample of Radio Galaxies

2001

We have constructed a new sample of 84 large angular size radio galaxies selected from the NRAO VLA Sky Survey (NVSS). Radio sources with declination above +60°, total flux density greater than 100 mJy at 1.4 GHz and angular size larger then 4′ have been selected and observed with the VLA at 1.4 and 4.9 GHz. A number of peculiar radio galaxies have been discovered, of which we present here results on J1835+620, J2114+820 and J2157+664.

Pienestä syntyi suurta = Nano came to Jyväskylä

2014

L’analyse des traits naturalistes dans "Tempête en juin" d’Irène Némirovsky

2011

Tämän tutkielman aiheena oli ensimmäinen osa Irène Némirovskyn postuumisti ilmestyneestä romaanista Suite française.Tutkimuksen tavoitteena oli analysoida Tempête en juin’ssä esiintyviä naturalistisen kirjallisuuden piirteitä. Teoriaosuudessa esitellään kirjailija sekä naturalismin syntyyn 1800-luvulla vaikuttaneet tekijät ja naturalistisen kirjallisuuden perinteiset piirteet. Teoriaosuuden lähdekirjallisuutena on pääosin käytetty Pierre Martinon teosta Le Naturalisme français. Analyysissä on pyritty löytämään ja tarkastelemaan naturalismille ominaisia piirteitä Némirovskyn teoksessa sekä lähdekirjallisuuteen, että kirjailijan omiin muistiinpanoihin tukeutuen. Ensimmäinen analyysiosuus kesk…

Non-linear systems under parametric a-stable Levý white noises

2005

Solving the NLO BK equation in coordinate space

2015

We present results from a numerical solution of the next-to-leading order (NLO) Balitsky-Kovchegov (BK) equation in coordinate space in the large Nc limit. We show that the solution is not stable for initial conditions that are close to those used in phenomenological applications of the leading order equation. We identify the problematic terms in the NLO kernel as being related to large logarithms of a small parent dipole size, and also show that rewriting the equation in terms of the "conformal dipole" does not remove the problem. Our results qualitatively agree with expectations based on the behavior of the linear NLO BFKL equation.

Constraints on neutrino masses from Planck and Galaxy clustering data

2013

We present here bounds on neutrino masses from the combination of recent Planck cosmic microwave background (CMB) measurements and galaxy clustering information from the Baryon Oscillation Spectroscopic Survey, part of the Sloan Digital Sky Survey-III. We use the full shape of either the photometric angular clustering (Data Release 8) or the 3D spectroscopic clustering (Data Release 9) power spectrum in different cosmological scenarios. In the Lambda CDM scenario, spectroscopic galaxy clustering measurements improve significantly the existing neutrino mass bounds from Planck data. We find Sigma m(v) < 0.39 eV at 95% confidence level for the combination of the 3D power spectrum with Planck C…

Probing interactions within the dark matter sector via extra radiation contributions

2013

The nature of dark matter is one of the most thrilling riddles for both cosmology and particle physics nowadays. While in the typical models the dark sector is composed only by weakly interacting massive particles, an arguably more natural scenario would include a whole set of gauge interactions which are invisible for the standard model but that are in contact with the dark matter. We present a method to constrain the number of massless gauge bosons and other relativistic particles that might be present in the dark sector using current and future cosmic microwave background data, and provide upper bounds on the size of the dark sector. We use the fact that the dark matter abundance depends…

Heavy-antiquark–diquark symmetry and heavy hadron molecules: Are there triply heavy pentaquarks?

2013

We explore the consequences of heavy flavor, heavy quark spin, and heavy antiquark-diquark symmetries for hadronic molecules within an effective field theory framework. Owing to heavy antiquark-diquark symmetry, the doubly heavy baryons have approximately the same light-quark structure as the heavy antimesons. As a consequence, the existence of a heavy meson-antimeson molecule implies the possibility of a partner composed of a heavy meson and a doubly heavy baryon. In this regard, the D (D) over bar* molecular nature of the X(3872) will hint at the existence of several baryonic partners with isospin I = 0 and J(P) = 5(-)/2 or 3(-)/2. Moreover, if the Z(b)(10650) turns out to be a B*(B) over…