نتایج جستجو برای: 253
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We present high-resolution spectral line and continuum VLBI and VLA observations of the nuclear region of NGC 253 at 22 GHz. While the water vapor masers in this region were detected on arcsecond and milliarcsecond scales, we could not detect any compact continuum emission with a 5σ upper limit of ∼ 1 mJy. The observations reveal that the water maser emission is not related to a possible low-lu...
INTRODUCTION ................................................................................... 243 BACKGROUND ...................................................................................... 245 I. THE ECONOMICS OF TICKET SNIPING ................................... 248 A. Long-term Revenue Maximization ....................................... 249 B. Inability to Price Discriminate .........
We report the TeV gamma-ray observations of the nearby normal spiral galaxy NGC 253. At a distance of ∼2.5 Mpc, NGC 253 is one of the nearest starburst galaxies. This relative closeness, coupled with the high star formation rate in the galaxy, make it a good candidate TeV gamma-ray source. Observations were carried out in 2000 and 2001 with the CANGAROO-II 10m imaging atmospheric Cerenkov teles...
La pandemia de la COVID-19, que nos afecta desde los primeros meses 2020, ha modificado nuestras costumbres y rutinas. Y también manera relacionarnos en medios escolares universitarios. Desde el Geoforo Iberoamericano sobre Educación, Geografía Sociedad hemos considerado se abría una oportunidad para re-pensar problemas sociales ambientales condicionan nuestra cotidianidad. estudio situaciones ...
Context. Massive star formation leads to enrichment of the interstellar medium with heavy elements. On other hand, abundance elements is a key parameter which study star-formation history galaxies. Furthermore, total molecular hydrogen mass, usually determined by converting CO or [C II ]158 μm luminosities, depends on metallicity as well. However, excitation metallicity-sensitive emission lines...
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