Neutral Hydrogen Observations of Arp 144
1988; American Astronomical Society; Volume: 20; Linguagem: Inglês
ISSN
2330-9458
Autores Tópico(s)Stellar, planetary, and galactic studies
ResumoA search was made for the giant intergalactic neutral hydrogen cloud (IGC) proposed by Freeman and de Vaucouleurs (1974) to be responsible for the peculiar galaxy system Arp 144. VLA 21 cm D-configuration observations disclosed the presence of a total of 5.6 x 10 to the 9th/sq h solar masses of neutral hydrogen - nearly half of which resides in two main structures extending as far as 98/h kpc from Arp 144. An additional amount of H I flux resides outside the velocity range covered by these observations. The overall H I distribution is consistent with the Freeman and de Vaucouleurs model. It may be possible to identify one of the large neutral hydrogen features as part of the IGC, with the other arising from tidal forces. An alternate hypothesis which views Arp 144 as an ongoing merger between the galaxies NGC 7828 and NGC 7829 is also considered. 12 references.
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