J/A+A/476/59 Fornax Cluster Spectroscopic Survey 2MASS galaxies (Morris+ 2007)
2MASS Galaxies in the Fornax Cluster Spectroscopic Survey.
Morris R.A.H, Phillipps S., Jones J.B., Drinkwater M.J., Gregg M.D,
Couch W.J., Parker Q.A., Smith R.M.
<Astron. Astrophys. 476, 59 (2007)>
=2007A&A...476...59M 2007A&A...476...59M
ADC_Keywords: Surveys ; Clusters, galaxy ; Redshifts ; Photometry, infrared
Keywords: surveys - galaxies: statistics -
galaxies: clusters: individual: Fornax
Abstract:
The Fornax Cluster Spectroscopic Survey (FCSS) is an all-object survey
of a region around the Fornax Cluster of galaxies undertaken using the
2dF multi-object spectrograph on the Anglo-Australian Telescope. Its
aim was to obtain spectra for a complete sample of all objects with
16.5<bj<19.7 irrespective of their morphology (i.e. including
`stars', `galaxies' and `merged' images). We explore the extent to
which (nearby) cluster galaxies are present in 2MASS. We consider the
reasons for the omission of 2MASS galaxies from the FCSS and vice
versa.
We consider the intersection (2.9 square degrees on the sky) of our
data set with the infra-red 2 Micron All-Sky Survey (2MASS), using
both the 2MASS Extended Source Catalogue (XSC) and the Point Source
Catalogue (PSC). We match all the XSC objects to FCSS counterparts by
position and also extract a sample of galaxies, selected by their FCSS
redshifts, from the PSC. We confirm that all 114 XSC objects in the
overlap sample are galaxies, on the basis of their FCSS velocities. A
total of 23 Fornax Cluster galaxies appear in the matched data, while,
as expected, the remainder of the sample lie at redshifts out to z=0.2
(the spectra show that 61% are early type galaxies, 18% are
intermediate types and 21% are strongly star forming). The PSC sample
turns out to contain twice as many galaxies as does the XSC. However,
only one of these 225 galaxies is a (dwarf) cluster member. On the
other hand, galaxies which are unresolved in the 2MASS data (though
almost all are resolved in the optical) amount to 71% of the
non-cluster galaxies with 2MASS detections and have redshifts out to
z=0.32.
Description:
We present two tables, the results of matching the Fornax Cluster
Spectroscopic Survey (FCSS) both with the 2MASS extended source
catalogue (XSC) and the 2MASS point source catalogue (PSC, Cat.
II/246). The 2MASS 2nd release data described in Jarrett et al.
(2000AJ....119.2498J 2000AJ....119.2498J) is used in this paper.
xsc-fcss.dat contains 114 extended objects in a circle of radius
1degree centred on NGC1399, 84 are matched in the FCSS itself using
a positional error of 3", 28 are in the brighter FLAIR sample of
Drinkwater et al. (2001ApJ...548L.139D 2001ApJ...548L.139D) and two are 15th magnitude
galaxies in the Ferguson (1989AJ.....98..367F 1989AJ.....98..367F, Cat. VII/180) Fornax
Cluster Catalogue (FCC).
psc-fcss.dat contains objects that are in the 2MASS PSC and also in
the FCSS again using a positional error of 3". Objects with cz of less
than 900km/s are removed as are objects which are also in the extended
sample above to leave a sample of 228 confirmed galaxies.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
psc-fcss.dat 58 228 Point sources in 2MASS PSC and Fornax Cluster
Spectroscopic Survey
xsc-fcss.dat 65 114 Extended objects in 2MASS XSC and also in
Fornax galaxy catalogues
--------------------------------------------------------------------------------
See also:
VII/180 : Galaxies in Fornax Cluster and five nearby groups (Ferguson+ 1990)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
Byte-by-byte Description of file: psc-fcss.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- Name Galaxy name (G1)
8- 9 I2 h RAh Right ascension (J2000.0)
11- 12 I2 min RAm Right ascension (J2000.0)
14- 17 F4.1 s RAs Right ascension (J2000.0)
19 A1 --- DE- Declination sign (J2000.0)
20- 21 I2 deg DEd Declination (J2000.0)
23- 24 I2 arcmin DEm Declination (J2000.0)
26- 27 I2 arcsec DEs Declination (J2000.0)
29- 32 F4.1 mag bjmag bj magnitude (G2)
34- 39 I6 km/s cz Recession velocity (heliocentric redshift)
41- 43 A3 --- Type Galaxy type (G3)
45- 48 F4.1 mag Jmag 2MASS J magnitude
50- 53 F4.1 mag Hmag 2MASS H magnitude
55- 58 F4.1 mag Kmag 2MASS K magnitude
--------------------------------------------------------------------------------
Byte-by-byte Description of file: xsc-fcss.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- Name Galaxy name (G1)
8- 9 I2 h RAh Right ascension (J2000.0)
11- 12 I2 min RAm Right ascension (J2000.0)
14- 17 F4.1 s RAs Right ascension (J2000.0)
19 A1 --- DE- Declination sign (J2000.0)
20- 21 I2 deg DEd Declination (J2000.0)
23- 24 I2 arcmin DEm Declination (J2000.0)
26- 27 I2 arcsec DEs Declination (J2000.0)
29- 32 F4.1 mag bjmag b_j magnitude (G2)
34- 37 F4.1 mag/arcsec+2 SB ? Surface Brightness (1)
39- 44 I6 km/s cz Recession velocity
46- 50 A5 --- Type Galaxy type (G3)
52- 55 F4.1 mag Jmag 2MASS J magnitude
57- 60 F4.1 mag Hmag 2MASS H magnitude
62- 65 F4.1 mag Kmag 2MASS K magnitude
--------------------------------------------------------------------------------
Note (1): SB is the estimated central surface brightness in bj magnitudes
per square arc second, obtained from an exponential fit to the outer
regions (Drinkwater et al., 2000A&A...355..900D 2000A&A...355..900D). This will be only
a notional value for giant ellipticals.
--------------------------------------------------------------------------------
Global notes:
Note (G1): Names are the Fornax Cluster Catalogue of Ferguson (FCC, 1989,
Cat. VII/180) numbers if available (e.g. 136 and B0886). The FCC
contains cross-references to other previous catalogues. Where no FCC
number exists, the galaxy is labelled FCSS and, following the NED
usage, the name will be "FCSS" followed by the IAU co-ordinate (J2000)
designations.
Note (G2): bj magnitudes are from our input catalogues (Drinkwater et
al., 2000A&A...355..900D 2000A&A...355..900D ) except for the interacting pair
ESO358-IG031 (= B1095), where the individual magnitudes have been
taken from NED.
Note (G3): Spectral classification, mostly from either the FLAIR data of
Drinkwater et al. (2001ApJ...548L.139D 2001ApJ...548L.139D) denoted by `f' and a galaxy
type or from the FCSS spectroscopic template matching:
types G0, G6, K5, M1 or em (for emission line).
--------------------------------------------------------------------------------
Acknowledgements:
Rhys Morris, R.Morris(at)bristol.ac.uk
(End) Rhys ap Hywel Morris [Bristol Univ.], Patricia Vannier [CDS] 04-Sep-2007