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J/MNRAS/415/1883 NGC 7448 HI sources from AGES (Davies+, 2011)
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Beginning of ReadMe :J/MNRAS/415/1883 AGES HI sources in NGC 7448 (Davies+, 2011)
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The Arecibo galaxy environment survey.
IV. The NGC 7448 region and the H I mass function.
Davies J.I., Auld R., Burns L., Minchin R., Momjian E., Schneider S.,
Smith M., Taylor R., Van Driel W.
<Mon. Not. R. Astron. Soc., 415, 1883-1894 (2011)>
=2011MNRAS.415.1883D
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ADC_Keywords: Surveys ; Clusters, galaxy ; Radio sources ; H I data
Keywords: galaxies: general - galaxies: groups: individual: NGC 7448 -
galaxies: ISM - radio lines: ISM
Abstract:
In this paper we describe results from the Arecibo Galaxy Environments
Survey (AGES). The survey reaches column densities of 3x10^18^cm^-2^
and masses of 10^7^M_sun_, over individual regions of order
10deg^2^ in size, out to a maximum velocity of 18000km/s. Each
surveyed region is centred on a nearby galaxy, group or cluster, in
this instance the NGC 7448 group. Galaxy interactions in the NGC 7448
group reveal themselves through the identification of tidal tails and
bridges. We find 2.5 times more atomic gas in the intergalactic
medium than in the group galaxies. We identify five new dwarf
galaxies, two of which appear to be members of the NGC 7448 group.
This is too small, by roughly an order of magnitude, a number of dwarf
galaxies to reconcile observation with theoretical predictions of
galaxy formation models. If they had observed this region of the sky
in previous wide-area blind HI surveys, HIPASS and ALFALFA, they would
have detected only 5 and 43 per cent, respectively, of the galaxies we
have detected, missing a large fraction of the atomic gas in this
volume.
Description:
The NGC 7448 group was observed over a number of months in 2009.
We used the seven-feed ALFA multibeam receiver and the WAPP
spectrometers to record two linear polarizations from each beam within
a 100-MHz bandwidth.