The Neutral Hydrogen Companions of Actively Star Forming Dwarf Galaxies
Author : Christopher Lee Taylor
Publisher :
Page : 478 pages
File Size : 13,72 MB
Release : 1995
Category :
ISBN :
Author : Christopher Lee Taylor
Publisher :
Page : 478 pages
File Size : 13,72 MB
Release : 1995
Category :
ISBN :
Author : D. Kunth
Publisher : Atlantica Séguier Frontières
Page : 540 pages
File Size : 26,40 MB
Release : 1985
Category : Dwarf galaxies
ISBN : 9782863320372
Author : Jeremy A MacHattie
Publisher :
Page : 294 pages
File Size : 12,58 MB
Release : 2013
Category :
ISBN :
The results of a study of the neutral hydrogen (HI) content and distribution within a sample of 18 blue compact dwarf galaxies (BCDs) are presented. An investigation of the behaviour of the gas-to-dust ratio (GDR) as a function of metallicity (Z) is also presented. Observations of these BCDs was performed using the Very Large Array (VLA) in 2009, a year in which the array was undergoing a technological upgrade to the the Karl G. Jansky VLA (JVLA). The observations were reduced and images processed using the Astronomical Image Processing Software (AIPS), and data cubes for each galaxy were produced. The results include detections of eleven HI lines (two new detections) and ten background continuum sources (two new discoveries). All detections are at a higher resolution and/or sensitivity than previous measurements. These detections spanned a large range of line widths and HI masses; some masses comparable to those in normal galaxies. Of particular interest was the discovery of a compact absorption feature in the dwarf galaxy Haro 11. A paper submitted to the Monthly Notices of the Royal Astronomical Society (MNRAS) Letters on this discovery is presented. Another significant result was the discovery of a highly extended and massive HI region in the dwarf galaxy CGCG 297-017. For those galaxies with no detected HI line or radio continuum, an upper limit to the flux density was computed, which was used to derive upper limits to the HI mass or star-formation rate (SFR) respectively. Three HI flux density upper limits are new results, and seven continuum flux density upper limits are also new. The GDR-Z relation at low metallicities shows a potential power law or broken power law relation with a turning point at Z=7.96 or Z=8.05. To within error, these turning points and power law indices of the broken power law fits are consistent with other work.
Author : Jonathan Victor Smoker
Publisher :
Page : 2930 pages
File Size : 46,81 MB
Release : 1993
Category :
ISBN :
Author : S. Böhme
Publisher : Springer Science & Business Media
Page : 928 pages
File Size : 32,36 MB
Release : 2013-04-17
Category : Science
ISBN : 3662123460
Author : Prof. Dr. Roland Wielen
Publisher : Springer Science & Business Media
Page : 1122 pages
File Size : 23,19 MB
Release : 2013-04-17
Category : Science
ISBN : 366212355X
Author : P Murdin
Publisher : CRC Press
Page : 5610 pages
File Size : 41,17 MB
Release : 2001-01-01
Category : Science
ISBN : 1000523039
In a unique collaboration, Nature Publishing Group and Institute of Physics Publishing have published the most extensive and comprehensive reference work in astronomy and astrophysics. This unique resource covers the entire field of astronomy and astrophysics and this online version includes the full text of over 2,750 articles, plus sophisticated search and retrieval functionality and links to the primary literature. The Encyclopaedia's authority is assured by editorial and advisory boards drawn from the world's foremost astronomers and astrophysicists. This first class resource is an essential source of information for undergraduates, graduate students, researchers and seasoned professionals, as well as for committed amateurs, librarians and lay people wishing to consult the definitive astronomy and astrophysics reference work.
Author : Stephen James O'Meara
Publisher : Cambridge University Press
Page : 499 pages
File Size : 12,7 MB
Release : 2011-06-30
Category : Science
ISBN : 1139500074
In this fresh list, Stephen James O'Meara presents 109 new objects for stargazers to observe. The Secret Deep list contains many exceptional objects, including a planetary nebula whose last thermal pulse produced a circumstellar shell similar to the one expected in the final days of our Sun's life; a piece of the only supernova remnant known visible to the unaided eye; the flattest galaxy known; the largest edge-on galaxy in the heavens; the brightest quasar; and the companion star to one of the first black hole candidates ever discovered. Each object is accompanied by beautiful photographs and sketches, original finder charts, visual histories and up-to-date astrophysical information to enrich the observing experience. Featuring galaxies, clusters and nebulae not covered in other Deep-Sky Companions books, this is a wonderful addition to the series and an essential guide for any deep-sky observer.
Author : Evan David Skillman
Publisher :
Page : 440 pages
File Size : 27,39 MB
Release : 1996
Category : Science
ISBN :
Author : Bärbel Silvia Koribalski
Publisher : Springer Science & Business Media
Page : 375 pages
File Size : 39,70 MB
Release : 2009-04-29
Category : Science
ISBN : 1402069332
This timely book presents an overview of the galaxies within the Local Volume, including the Local Group and our closest neighbours, the Andromeda Galaxy and the Magellanic Clouds. Presented here are the latest results from radio, infrared and optical surveys as well as detailed multi-wavelength studies of individual galaxies. The book aims to provide a vibrant forum for presentations and discussions across a broad range of astrophysical topics.