J/AJ/142/83 SIGRID galaxy sample (Nicholls+, 2011)
The Small Isolated Gas-Rich Irregular Dwarf (SIGRID) galaxy sample:
description and first results.
Nicholls D.C., Dopita M.A., Jerjen H., Meurer G.R.
<Astron. J., 142, 83 (2011)>
=2011AJ....142...83N 2011AJ....142...83N
ADC_Keywords: Galaxy catalogs ; H I data ; Radial velocities
Keywords: galaxies: dwarf - galaxies: irregular - galaxies: statistics -
H II regions - ISM: abundances
Abstract:
Using an optically unbiased selection process based on the HIPASS
neutral hydrogen survey, we have selected a sample of 83 spatially
isolated, gas-rich dwarf galaxies in the southern hemisphere with cz
between 350 and 1650km/s, and with R-band luminosities and HI masses
less than that of the Small Magellanic Cloud. The sample is an
important population of dwarf galaxies in the local universe, all with
ongoing star formation, and most of which have no existing
spectroscopic data. We are measuring the chemical abundances of these
galaxies, using the integral-field spectrograph on the Australian
National University 2.3m telescope, the Wide-Field Spectrograph. This
paper describes our survey criteria and procedures, lists the survey
sample, and reports on initial observations.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 112 83 Small Isolated Gas-rich Irregular Dwarf Galaxy
(SIGRID) sample.
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See also:
VIII/73 : HI Parkes All Sky Survey Catalogue (HIPASS) (Meyer+, 2004)
J/AJ/124/690 : HI-selected galaxies in South Celestial Cap (Kilborn+, 2002)
J/ApJS/165/307 : Survey for Ionization in Neutral Gas Galaxies (Meurer+ 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- ID [1/83] SIGRID sequential number
4- 13 A10 --- HIPASS HIPASS designation (JHHMM+DDa)
14- 45 A32 --- Gal Optical Galaxy name
47- 48 A2 --- n_Gal [*+ ] Note on Gal (1)
51- 52 I2 h RAh Right ascension (J2000)
54- 55 I2 min RAm Right ascension (J2000)
57- 60 F4.1 s RAs Right ascension (J2000)
62 A1 --- DE- Declination sign (J2000)
63- 64 I2 deg DEd Declination (J2000)
66- 67 I2 arcmin DEm Declination (J2000)
69- 70 I2 arcsec DEs Declination (J2000)
72- 75 I4 km/s HV Heliocentric velocity
77- 81 F5.2 Mpc Dist Distance
82- 83 A2 --- n_Dist [** ] Dist from literature (2)
85- 89 F5.1 km/s W50 Rotation velocity measured at 50% peak intensity
91- 94 F4.2 [Msun] logMHI HI mass
96-100 F5.1 mag RMAG R absolute magnitude
102-105 F4.1 --- theta ?=- Tidal index θ (3)
107-112 A6 --- Type Class of the Hα region morphology (4)
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Note (1): Note as follows:
+ = Objects have no GALEX image
* = Objects were observed in the SINGG program (Cat. J/ApJS/165/307)
Note (2): Distances marked (**) are directly measured values from the
literature, as reported in NED; all others are calculated from
redshifts and the flow model.
Note (3): Tidal index defined as θ=log(M/d3)+C,
where M is the disturber galaxy mass, d is the separation between
disturber and target, and C is an arbitrary constant, evaluated by
setting the "cyclic Keplerian period" to the Hubble time, a point
beyond which galaxies could be deemed not to have interacted
(Karachentsev & Makarov, 1999IAUS..186..109K 1999IAUS..186..109K)
Note (4): The "type" category classifies the morphology of the Hα regions
and is described in Section 5. It is only evaluated for objects with
SINGG images, where information on the Hα regions is available.
i = centrally condensed Hα region(s) (Fig. 4) or
bright Hα showing active starburst and ouflows (Fig. 5)
ii = centrally clumped multiple Hα regions (Fig. 6) or
faint Hα compared to R band (Fig. 7)
iii = dispersed Hα regions (Fig. 8)
iv = separate neighboring Hα regions (Fig. 9)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 03-Nov-2012