Author: Manuel Gerardo Corona Galindo

DIATOMIC ANALYTIC MOLECULAR PARTITION FUNCTIONS FOR STELLAR ATMOSPHERES

OCTAVIO CARDONA NUÑEZ Manuel Gerardo Corona Galindo (2013)

Approximate partition functions and their derivatives for diatomic molecules are formulated taking into account the finite number of levels. A procedure is developed to derive compact analytic expressions, without free parameters, necessary for the efficient evaluation of some thermodynamic coefficients from the partition functions for diatomic molecules useful in modeling low temperature stellar atmo- spheres.

Se formulan funciones de partición aproximadas y sus derivadas para moléculas diatómicas tomando en cuenta el número finito de niveles. Se desarrolla además un procedimiento para obtener expresiones analíticas compactas, sin parámetros libres, necesarias para la evaluación eficiente de algunos coeficientes termodinámicos de la función de partición para moléculas diatómicas de utilidad en el modelado de atmósferas estelares de baja temperatura.

Article

Equation of state Plasmas Stars: atmospheres CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA ASTRONOMÍA Y ASTROFÍSICA ASTRONOMÍA Y ASTROFÍSICA

Sensitivity of the High Altitude Water Cherenkov Detector to Sources of Multi-TeV Gamma Rays

MAURO JAVIER BONILLA ROSALES Alberto Carramiñana Alonso Raquel Díaz Hernández Manuel Gerardo Corona Galindo PEDRO AMADO MIRANDA ROMAGNOLI DANIEL ROSA GONZALEZ SERGIY SILICH Ibrahim Daniel Torres Aguilar (2013)

The High Altitude Water Cherenkov (HAWC) observatory is an array oflarge water Cherenkov detectors sensitive to gamma rays and hadronic cosmicrays in the energy band between 100 GeV and 100 TeV. The observatory willbe used to measure high-energy protons and cosmic rays via detection of theenergetic secondary particles reaching the ground when one of these particlesinteracts in the atmosphere above the detector. HAWC is under constructionat a site 4100 meters above sea level on the northern slope of the volcano SierraNegra, which is located in central Mexico at 19ºN latitude. It is scheduledfor completion in 2014. In this paper we estimate the sensitivity of the HAWCinstrument to point-like and extended sources of gamma rays. The source fluxesare modeled using both unbroken power laws and power laws with exponentialcutoffs. HAWC, in one year, is sensitive to point sources with integral power-lawspectra as low as 5 × 10⁻¹³ cm⁻² sec⁻¹ above 2 TeV (approximately 50mCrab) over 5 sr of the sky. This is a conservative estimate based on simpleevent parameters and is expected to improve as the data analysis techniquesare refined. We discuss known TeV sources and the scientific contributions that HAWC can make to our understanding of particle acceleration in these sources.

Article

Cosmic ray Water cherenkov TeV gamma-ray astronomy Cherenkov counter: water CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA ASTRONOMÍA Y ASTROFÍSICA ASTRONOMÍA Y ASTROFÍSICA