J/MNRAS/415/1883 AGES HI sources in NGC 7448 (Davies+, 2011)
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 2011MNRAS.415.1883D
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 ∼3x1018cm-2
and masses of ∼107M☉, over individual regions of order
10deg2 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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 66 175 The HI properties of galaxies detected in the
AGES NGC 7448 data cube
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See also:
J/MNRAS/383/1519 : Abell 1367 HI sources from AGES (Cortese+, 2008)
J/AJ/140/1093 : NGC7332/9 and NGC 1156 HI sources from AGES (Minchin+, 2010)
http://www.naic.edu/~ages/public_data.html : AGES databases
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [AGES]
5- 18 A14 --- AGES AGES designation (JHHMMSS+DDMMSS)
20- 21 I2 h RAh Right ascension (J2000)
23- 24 I2 min RAm Right ascension (J2000)
26- 29 F4.1 s RAs Right ascension (J2000)
31 A1 --- DE- Declination sign (J2000)
32- 33 I2 deg DEd Declination (J2000)
35- 36 I2 arcmin DEm Declination (J2000)
38- 41 F4.1 arcsec DEs Declination (J2000)
43- 47 I5 km/s Vel Recession velocity
49- 51 I3 km/s W50 Velocity width at 50 per cent peak height
53- 55 I3 km/s W20 Velocity width at 20 per cent peak height
57- 61 F5.3 Jy Fpeak Peak flux density at 21cm
63- 66 F4.1 Jy.km/s Ftot Total flux at 21cm
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History:
From electronic version of the journal
References:
Auld et al., Paper I, 2006MNRAS.371.1617A 2006MNRAS.371.1617A
Cortese et al., Paper II, 2008MNRAS.383.1519C 2008MNRAS.383.1519C, Cat. J/MNRAS/383/1519
Minchin et al., Paper III, 2010AJ....140.1093M 2010AJ....140.1093M, Cat. J/AJ/140/1093
(End) Patricia Vannier [CDS] 15-Mar-2012