J/MNRAS/452/2087 Galaxy And Mass Assembly (GAMA): DR2 (Liske+, 2015)
Galaxy And Mass Assembly (GAMA): end of survey report and data release 2.
Liske J., Baldry I.K., Driver S.P., Tuffs R.J., Alpaslan M., Andrae E.,
Brough S., Cluver M.E., Grootes M.W., Gunawardhana M.L.P., Kelvin L.S.,
Loveday J., Robotham A.S.G., Taylor E.N., Bamford S.P., Bland-Hawthorn J.,
Brown M.J.I., Drinkwater M., Hopkins A.M., Meyer M.J., Norberg P.,
Peacock J.A., Agius N.K., Andrews S.K., Bauer A.E., Ching J.H.Y.,
Colless M., Conselice C.J., Croom S.M., Davies L.J.M., De Propris R.,
Dunne L., Eardley E.M., Ellis S., Foster C., Frenk C.S., Haussler B.,
Holwerda B.W., Howlett C., Ibarra H., Jarvis M.J., Jones D.H., Kafle P.R.,
Lacey C.G., Lange R., Lara-Lopez M.A., Lopez-Sanchez A.R., Maddox S.,
Madore B.F., Mcnaught-Roberts T., Moffett A.J., Nichol R.C., Owers M.S.,
Palamara D., Penny S.J., Phillipps S., Pimbblet K.A., Popescu C.C.,
Prescott M., Proctor R., Sadler E.M., Sansom A.E., Seibert M., Sharp R.,
Sutherland W., Vazquez-Mata J.A., Van Kampen E., Wilkins S.M., Williams R.,
Wright A.H.
<Mon. Not. R. Astron. Soc., 452, 2087-2126 (2015)>
=2015MNRAS.452.2087L 2015MNRAS.452.2087L (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Galaxy catalogs ; Redshifts ; Photometry, SDSS ;
Photometry, infrared
Keywords: surveys; galaxies: distances and redshifts
galaxies: fundamental parameters; galaxies: general
galaxies: photometry; galaxies: statistics
Abstract:
The Galaxy And Mass Assembly (GAMA) survey is one of the largest
contemporary spectroscopic surveys of low redshift galaxies. Covering
an area of ∼286deg2 (split among five survey regions) down to a
limiting magnitude of r<19.8mag, we have collected spectra and
reliable redshifts for 238000 objects using the AAOmega spectrograph
on the Anglo-Australian Telescope. In addition, we have assembled
imaging data from a number of independent surveys in order to generate
photometry spanning the wavelength range 1nm-1m. Here, we report on
the recently completed spectroscopic survey and present a series of
diagnostics to assess its final state and the quality of the redshift
data. We also describe a number of survey aspects and procedures, or
updates thereof, including changes to the input catalogue, redshifting
and re-redshifting, and the derivation of ultraviolet, optical and
near-infrared photometry. Finally, we present the second public
release of GAMA data. In this release, we provide input catalogue and
targeting information, spectra, redshifts, ultraviolet, optical and
near-infrared photometry, single-component Sersic fits, stellar
masses, Hα-derived star formation rates, environment
information, and group properties for all galaxies with r<19.0mag in
two of our survey regions, and for all galaxies with r<19.4mag in a
third region (72225 objects in total). The data base serving these
data is available at http://www.gama-survey.org/.
Description:
Following the first three years of survey operations (2008
February-2010 May; see Driver et al. 2011MNRAS.413..971D 2011MNRAS.413..971D, Cat.
J/MNRAS/413/971) the GAMA spectroscopic survey on the AAT was
substantially expanded, resulting in a number of significant changes
to the GAMA IC and target selection. Here (and in other GAMA
publications), the term 'GAMA I' refers to the data collected during
these first three years, and to all data products that can be traced
back to the original version of the IC (called InputCatAv05). In
contrast, the term 'GAMA II' refers to the entire GAMA data set,
including all GAMA I and all subsequently collected data, and all data
products that can be traced back to the revised version of the IC
(InputCatAv06 for the equatorial survey regions).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
inputcat.dat 276 960510 SDSS DR6 data of GAMA I survey regions.
GAMA's master input catalogue (InputCatA V05)
tiling.dat 246 169850 Science targets and information for tiling and
spectroscopic observation (InputCatA V16)
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See also:
J/MNRAS/413/971 : Galaxy And Mass Assembly (GAMA) DR1 (Driver+, 2011)
http://www.gama-survey.org : GAMA Home Page
Byte-by-byte Description of file: inputcat.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- CataID Unique GAMA ID of object (CATAID)
8- 25 I18 --- objID SDSS objid (OBJID)
27- 35 F9.5 deg RAdeg Right ascension (J2000) (RA)
37- 45 F9.5 deg DEdeg Declination (J2000) (DEC)
47- 65 I19 --- Flags Flags (SDSS photoobj table) (FLAGS)
67- 75 I9 --- PTarget Primary target (SDSS photoobj table)
(PRIMTARGET)
77- 86 F10.6 arcsec Prad Petrosian radius (PETRORAD_R)
88- 95 F8.5 mag rmagPSF PSF r magnitude (PSFMAG_R)
97-107 F11.5 mag rmagFib ?=-9999 3-arcsec fiber r magnitude (FIBERMAG_R)
109-127 I19 --- Flagsr r flags (SDSS photoobj table) (FLAGS_R)
129-136 F8.6 mag rext r-band Galactic extinction (EXTINCTION_R)
138-148 F11.5 arcsec Prad90 ?=-9999 Radius containing 90% of Petrosian flux
(PETROR90_R)
150-160 F11.5 arcsec Prad50 ?=-9999 Radius containing 50% of Petrosian flux
(PETROR50_R)
162-169 F8.5 mag uPmag SDSS DR6 Petrosian u magnitude (PETROMAG_U)
171-178 F8.5 mag gPmag SDSS DR6 Petrosian g magnitude (PETROMAG_G)
180-187 F8.5 mag rPmag SDSS DR6 Petrosian r magnitude (PETROMAG_R)
189-199 F11.5 mag iPmag ?=-9999 SDSS DR6 Petrosian i magnitude
(PETROMAG_I)
201-208 F8.5 mag zPmag SDSS DR6 Petrosian z magnitude (PETROMAG_Z)
210-220 F11.5 mag uMmag ?=-9999 SDSS DR6 model u magnitude (MODELMAG_U)
222-232 F11.5 mag gMmag ?=-9999 SDSS DR6 model g magnitude (MODELMAG_G)
234-241 F8.5 mag rMmag SDSS DR6 model r magnitude (MODELMAG_R)
243-253 F11.5 mag iMmag ?=-9999 SDSS DR6 model i magnitude (MODELMAG_I)
255-265 F11.5 mag zMmag ?=-9999 SDSS DR6 model z magnitude (MODELMAG_Z)
267-271 I5 --- Status Status (SDSS photoobj table) (STATUS)
273-276 I4 --- Run SDSS run number (RUN)
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Byte-by-byte Description of file: tiling.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- CataID Unique GAMA ID of object (CATAID)
8- 25 I18 --- objID SDSS objid (OBJID)
27- 35 F9.5 deg RAdeg Right ascension (J2000) (RA)
37- 45 F9.5 deg DEdeg Declination (J2000) (DEC)
47- 53 F7.4 mag rmagFib 3-arcsec fiber r magnitude (FIBERMAG_R)
55- 61 F7.4 mag rPmag Extinction-corrected SDSS DR6 Petrosian
magnitude (R_PETRO)
63- 73 F11.5 mag uMmag ?=-9999 Extinction-corrected SDSS DR6
u magnitude (U_MODEL)
75- 85 F11.5 mag gMmag ?=-9999 Extinction-corrected SDSS DR6
g magnitude (G_MODEL)
87- 93 F7.4 mag rMmag Extinction-corrected SDSS DR6 r magnitude
(R_MODEL)
95-101 F7.4 mag iMmag Extinction-corrected SDSS DR6 i magnitude
(I_MODEL)
103-110 F8.5 mag zMmag Extinction-corrected SDSS DR6 z magnitude
(Z_MODEL)
112-113 I2 --- SCode Survey code for redshift source
(SURVEY_CODE) (1)
115-123 F9.6 --- z ?=-9.99999 Spectroscopic redshift (Z)
125 I1 --- NQ Quality of redshift (NQ)
127-159 A33 --- SpecId ID of spectrum from SpecAll table
(SPECID)
161 I1 --- NGamaSpec Number of GAMA spectra matched to object
(NUMGAMASPEC)
163-169 F7.4 mag/arcsec+2 SuBrR SDSS Petro half-light surface brightness
(R_SB)
171-179 F9.6 mag SG-sepr rpsf-rmodel star-galaxy separation
parameter (SG_SEP)
181-189 F9.6 mag SG-SepJK ?=-9.99 J-K-f_locus star-galaxy separation
parameter (SGSEPJK)
191-199 F9.5 mag Kmag ?=-9.99 Extinction-corrected r-defined
auto AB K magnitude (K_AUTO)
201-203 I3 --- TFlag Bitwise target criteria
(TARGET_FLAGS) (2)
205 I1 --- SClass Useful for selecting samples
(SURVEY_CLASS) (3)
207 I1 --- PClass Priorities for targeting
(PRIORITY_CLASS) (4)
209-210 I2 --- NClass Number of priority_class≥8 targets within
40 arcsec (NEIGHBOUR_CLASS)
212-219 F8.6 --- MasK10 Mask value 0.0 to 1.0 around V<10 stars
(MASKIC10) (5)
221-228 F8.6 --- Mask12 Mask value 0.0 to 1.0 around V<12 stars
(MASKIC12) (5)
230-232 I3 --- VClass Visual classification (VIS_CLASS) (6)
234-244 A11 --- n_VClass Initials of classifiers, xxx for none
(VISCLASSUSER)
246 I1 --- DR2Flag [0,1] Indicates whether spectra, redshifts
and ancillary data for this object are
released in DR2 (DR2_FLAG)
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Note (1): Survey code for source of redshift as follows:
1 = SDSS
2 = 2dFGRS
3 = MGC
4 = 2SLAQ-LRG
5 = GAMA
6 = 6dFGS
7 = UZC
8 = 2QZ
9 = 2SLAQ-QSO
10 = NED
11 = GAMA_LT
12 = WiggleZ
Note (2): Target flag (t) (showing which target criteria are satisfied)
(bitwise set of flags, bit X):
------------------------------------
X t=2^X meaning
------------------------------------
0 1 SDSS main galaxy sample
1 2 SDSS LRG sample
2 4 r<19.0 and rpsf-rmodel>0.25 (high priority in Year 1)
3 8 r<19.4 (G09,G15) or r<19.8 (G12)
4 16 r<19.8
5 32 z_model<18.2
6 64 K_AB<17.6
7 128 (g_model<20.6 or r_model<19.8 or i_model<19.4) (G12)
8 256 radio_flux>0.0
Note (3): Survey class (sc) as follows:
sc = 0: not a target (except for checks on vis_class=3)
sc = 1: target only because of radio selection (F1 not (MS or F2 or F3))
sc ≥ 2: passes star-galaxy separation criteria (MS, F2 or F3)
sc ≥ 3: r<19.8 or zK-selected (MS, F2) (uniform selection in all regions)
sc ≥ 4: *** MS ***
sc ≥ 5: MS r or z-selected
sc ≥ 6: *** MS r-selected only ***
sc ≥ 7: r<19.0 and sg_sep>0.25 (Year 1 high priority targets)
See the IC paper for details on the selection.
'MS' means main survey: main survey =
(r<19.4 (G09,G15) or r<19.8 (G12) or K_AB<17.6 or z_model<18.2)
Note (4): Priority Class (p):
p > 1 except p=2,4,7 satisfy survey_class ≥ 3;
p > 1 satisfy fiber mag limits 16.8 < r_fib < 22.8;
p > 1 expect p=7 satisfy vis_class≤1 or vis_class=255.
Note (5): These parameters encode the bright star mask. The bright star mask is
based on stars in the Tycho 2, Tycho 1 and Hipparcos catalogues. For
each bright star, a scattered-light radius (R_s) was estimated based
on the circular region over which the star flux per pixel is greater
than five times the sky noise level. For each object in TilingCat
Mask10 (MASKIC10) is defined as follows:
d ≤ R_s : MASKIC10 = 1
R_s < d ≤ 5*R_s : MASKIC10 = R_s / d
d > 5*R_s : MASKIC10 = 0
where d is the distance between the object and the nearest V < 10 mag
star, which has scattered light radius R_s. In other words, the
MASKIC10 value decreases from unity when d ≤ R_s to 0.2 when d =
5*R_s, and then jumps to 0 when d > 5*R_s. MASKIC12 is defined in
the same way for V < 12 mag stars. In addition, objects within an SDSS
database mask for holes, satellite trails or bleeding pixels had these
mask values set to unity.
p=9: Q≤2 and numgamaspec = 0 (target but never attempted)
p=8: Q≤2 and numgamaspec = 1 (only one failed GAMA observation)
p=7: Q≤2 and vis_class=3 (would be a target other than vis_class)
p=6: Q=3 and numgamaspec ≤1 (to check the Q=3 redshift blunder rate)
p=5: Q≤2 and numgamaspec ≥2 (two or more failed GAMA observations)
p=4: Q≤2 other targets (sc=1 or sc=2)
p=2: Q ≥ 3 other targets (sc=1 or sc=2 done)
p=0: all others including: vis_class=2-4 objects, fibre bright or fibre faint
Note (6): Visual classification as follows:
0 = not eyeballed
1 = yes a target
2 = not a target (no evidence of galaxy light)
3 = not a target (not the main part of a galaxy)
4 = compromised photometry (selection mag has serious error)
255 = not eyeballed but the following flags are *all* zero EDGE, BLENDED,
CHILD, MAYBE_CR, MAYBE_EGHOST
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History:
Copied at http://www.gama-survey.org
(End) Patricia Vannier [CDS] 15-Feb-2016