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Williams, T H, 6946
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/425850Surname: WILLIAMS. Given Name(s) or Initials: T H. Military Service Number or Last Known Location: 6946. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 47147.252569
Item: [2016.0049.58111] "Williams, T H, 6946
NGC 6946
No full textEsta imagem apresenta a galáxia NGC 6946, localizada na constelação de Cepheus, há cerca de 10 milhões de anos-luz do planeta TerraComponente Curricular::Educação Superior::Ciências Exatas e da Terra::Astronomi
NGC 6946
No full textEsta imagem apresenta a galáxia NGC 6946, localizada na constelação de Cepheus, há cerca de 10 milhões de anos-luz do planeta TerraComponente Curricular::Educação Superior::Ciências Exatas e da Terra::Astronomi
NGC 6946
No full textEsta imagem apresenta a galáxia NGC 6946, localizada na constelação de Cepheus, há cerca de 10 milhões de anos-luz do planeta TerraComponente Curricular::Educação Superior::Ciências Exatas e da Terra::Astronomi
NGC 6946
No full textEsta imagem apresenta a galáxia NGC 6946, localizada na constelação de Cepheus, há cerca de 10 milhões de anos-luz do planeta TerraComponente Curricular::Educação Superior::Ciências Exatas e da Terra::Astronomi
Unusual Objects in the Spiral Galaxy NGC 6946
No full textSeveral strange objects in the spiral galaxy NGC 6946 are described. One of these objects is the giant stellar complex noted long ago; we suggested that its sharp semicircular western edge is a result of the ram pressure, arising owing to motion of this complex through the HI halo of NGC 6946. We found another enigmatic object, proposing for it the name Red Ellipse; it is located within the isolated Northern arm of the galaxy. The enormous size of this Ellipse, and especially the spectroscopic data obtained recently with the 6-m reflector of the Special Astrophysical Observatory, made us to conclude that this object could not be a supernova remnant. The excellent image of NGC 6946 obtained with the Subaru 8-m telescope also shows a strange region with several regular crossed dark lanes, connected with a black spot
Holes and high velocity HI in NGC 6946
No full textWe are studying the properties of the holes and the high velocity gas in NGC 6946. Here we present some puzzling results.</p
The molecular spiral arms of NGC 6946
No full textHigh resolution observations of molecules in external galaxies are essential to understanding physical processes leading to the formation of stars. One question is whether there is a spiral structure in the molecular gas, but it was not possible to resolve the spiral arms of external galaxies until the advent of large millimeter-wave telescopes. With the Institute for Radio Astronomy in the Millimeter Range (IRAM) 30 m telescope, researchers are carrying through the mapping of NGC 6946 in the CO-12(1-0) and (2-1) lines. This galaxy is a large, gas-rich Scd spiral with a strong star formation activity. NGC 6946 is well studied at radio and optical wavelengths, so that it is possible to compare the location of the spiral arms tracers: HI ridge, HII regions and molecular clouds. The disk CO emission is very contrasted (no lines for some positions, 1 K in CO(1-0) for some others) and correlated with the optical spiral arms: this clearly shows up in a figure which presents superimposed contours of CO(2-1) integrated emissivity and of H alpha line emission. The agreement is very good, and there is no displacement across the arm between the CO, HI and H alpha ridges of emission. The arms are barely resolved by the 23 inch beam and the molecular contrast averaged over the map is about 4. The CO(2-1) maxima are closer to the position of the HII regions than those of CO(1-0), which could be due to variations of excitation conditions. The CO excitation in the disk of NGC 6946 is low: when all data are convolved to the same resolution of 23 inches the CO(2-1) lines are about 0.45 times fainter than the CO(1-0) ones, while in the nucleus they have roughly the same intensity. This suggests that in the disk of NGC 6946 most of the CO emission comes from cold optically thick gas located in cloud envelopes rather than from cloud cores. The molecular and atomic component in the observed regions of NGC 6946 seems to be organized in large gaseous complexes
Holes and high velocity HI in NGC 6946
No full textWe are studying the properties of the holes and the high velocity gas in NGC 6946. Here we present some puzzling results
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