J/A+A/414/23 CCD Hα and R photometry of 334 galaxies (James+, 2004)
The Hα Galaxy Survey.
I. The galaxy sample, Hα narrow-band observations and star formation
parameters for 334 galaxies
James P.A., Shane N.S., Beckman J.E., Cardwell A., Collins C.A.,
Etherton J., de Jong R.S., Fathi K., Knapen J.H., Peletier R.F.,
Percival S.M., Pollacco D.L., Seigar M.S., Stedman S., Steele I.A
<Astron. Astrophys. 414, 23 (2004)>
=2004A&A...414...23J 2004A&A...414...23J
ADC_Keywords: Galaxies, photometry ; Photometry, CCD
Keywords: galaxies: general - galaxies: spiral - galaxies: irregular -
galaxies: fundamental parameters - galaxies: photometry -
galaxies: statistics
Abstract:
We discuss the selection and observations of a large sample of nearby
galaxies, which we are using to quantify the star formation activity
in the local Universe. The sample consists of 334 galaxies across all
Hubble types from S0/a to Im and with recession velocities of between
0 and 3000km/s. The basic data for each galaxy are narrow band
Hα+[NII] and R-band imaging, from which we derive star formation
rates, Hα+[NII] equivalent widths and surface brightnesses, and
R-band total magnitudes. A strong correlation is found between total
star formation rate and Hubble type, with the strongest star formation
in isolated galaxies occurring in Sc and Sbc types. More surprisingly,
no significant trend is found between Hα+[NII] equivalent width
and galaxy R-band luminosity. More detailed analyses of the data set
presented here will be described in subsequent papers.
Description:
Hα plus [NII] and R-band CCD photometry and derived parameters
are presented for the full sample of 334 spiral and irregular
galaxies. Galaxy distances are derived using a Virgo-infall corrected
model which is described in the paper, and star formation rates are
derived from Hα plus [NII] fluxes using the conversion defined by
Kennicutt et al. (1994ApJ...435...22K 1994ApJ...435...22K). The entries are arranged
within five bins in recession velocity, and in order of increasing
Right Ascension within these bins.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 111 334 Photometric parameters for 334 galaxies
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- Name Galaxy number, mainly from UGC (1)
16- 21 A6 --- Class Galaxy classification
25- 29 I5 km/s RV ? Recession velocity
32- 35 F4.1 Mpc Dist Galaxy distance (2)
38- 40 F3.1 arcmin Diam Galaxy D25 major axis size
43- 45 F3.1 --- a/b Galaxy major-to-minor axis ratio
48- 52 F5.2 mag Rmag Galaxy total R magnitude from this study
55- 58 F4.2 mag e_Rmag Error on R magnitude
61- 65 F5.1 10-16W/m2 FHa Hα+[NII] flux
67- 71 F5.2 10-16W/m2 e_FHa Hα+[NII] flux error
74- 77 F4.1 nm EW ? Hα+[NII] equivalent width
80- 82 F3.1 nm e_EW ? Hα+[NII] equivalent width error
84- 90 F7.4 solMass/yr SFR Star formation rate
93- 98 F6.4 solMass/yr e_SFR Star formation rate error
101-106 F6.2 W/m2/arcsec2 SB ? Hα+[NII] surface brightness
108-111 F4.2 W/m2/arcsec2 e_SB ? Surface brightness error
--------------------------------------------------------------------------------
Note (1): Shane 1 is a previously uncatalogued galaxy.
The J2000 position is RA = 10 34 38.5, DE = +50 47 24
Note (2): Galaxy distances derived using a Virgo-infall corrected model,
and literature distances for some very local galaxies.
--------------------------------------------------------------------------------
Acknowledgements: Phil A. James
(End) Patricia Bauer [CDS] 01-Jan-2004