J/ApJS/199/26 The 2MASS Redshift Survey (2MRS) (Huchra+, 2012)
The 2MASS Redshift Survey - Description and data release.
Huchra J.P., Macri L.M., Masters K.L., Jarrett T.H., Berlind P.,
Calkins M., Crook A.C., Cutri R., Erdogdu P., Falco E., George T.,
Hutcheson C.M., Lahav O., Mader J., Mink J.D., Martimbeau N., Schneider S.,
Skrutskie M., Tokarz S., Westover M.
<Astrophys. J. Suppl. Ser., 199, 26 (2012)>
=2012ApJS..199...26H 2012ApJS..199...26H
ADC_Keywords: Galaxies, IR ; Extinction ; Photometry, infrared ; Redshifts ;
Surveys ; Galaxy catalogs
Keywords: catalogs - galaxies: distances and redshifts - surveys
Abstract:
We present the results of the 2MASS Redshift Survey (2MRS), a ten-year
project to map the full three-dimensional distribution of galaxies in
the nearby universe. The Two Micron All Sky Survey (2MASS) was
completed in 2003 and its final data products, including an extended
source catalog (XSC), are available online. The 2MASS XSC contains
nearly a million galaxies with Ks≤13.5mag and is essentially complete
and mostly unaffected by interstellar extinction and stellar confusion
down to a galactic latitude of |b|=5° for bright galaxies.
Near-infrared wavelengths are sensitive to the old stellar populations
that dominate galaxy masses, making 2MASS an excellent starting point
to study the distribution of matter in the nearby universe. We
selected a sample of 44599 2MASS galaxies with Ks≤11.75mag and
|b|≥5° (≥8° toward the Galactic bulge) as the input catalog
for our survey. We obtained spectroscopic observations for 11000
galaxies and used previously obtained velocities for the remainder of
the sample to generate a redshift catalog that is 97.6% complete to
well-defined limits and covers 91% of the sky. This provides an
unprecedented census of galaxy (baryonic mass) concentrations within
300Mpc. Earlier versions of our survey have been used in a number of
publications that have studied the bulk motion of the Local Group,
mapped the density and peculiar velocity fields out to 50h-1Mpc,
detected galaxy groups, and estimated the values of several
cosmological parameters. Additionally, we present morphological types
for a nearly complete sub-sample of 20860 galaxies with Ks≤11.25mag
and |b|≥10°.
Description:
We obtained spectra for 11000 galaxies that met the selection
criteria, plus an additional 2898 galaxies beyond the catalog limits.
Observations were carried out between 1997 September and 2011 January
using a variety of facilities (Fred L. Whipple, 1.5m; Cerro Tololo
1.5m and 4m; McDonald, 2.1m; Hobby-Eberly, 9.2m). The majority of the
spectra obtained for this survey were acquired at the Fred L. Whipple
Observatory (FLWO) 1.5m telescope, which mostly targeted galaxies in
the northern hemisphere. In the southern hemisphere, we relied heavily
on observations by the 6dFGS project (Jones et al. 2009, Cat. VII/259)
but also carried out our own observations using the Cerro Tololo
Interamerican Observatory (CTIO) 1.5m telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 233 44599 2MRS catalog
table4.dat 73 590 2MRS Catalog - bibliographic references
table6.dat 68 4291 2MRS redshifts for 2MASS XSC galaxies beyond the
main catalog limits
table7.dat 68 14 Redshifts for galaxies not in the 2MASS XSC
which were observed serendipitously
table8.dat 53 324 2MASS XSC or LGA objects removed from input
catalog
table9.dat 71 74 2MASS XSC objects with reprocessed photometry
table10.dat 16 87 2MASS XSC objects with suspect photometry,
flagged for reprocessing at a later date
table11.dat 16 155 2MASS XSC objects with compromised photometry,
flagged for reprocessing and removed from catalog
table12.dat 166 334 Alternative redshifts chosen over NED default
redshifts
table13.dat 48 4857 Redshifts from 6dFGS, SDSS or NED for galaxies
also observed by 2MRS
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See also:
II/306 : The SDSS Photometric Catalog, Release 8 (Adelman-McCarthy+, 2011)
VII/259 : 6dF galaxy survey final redshift release (Jones+, 2009)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/AJ/126/63 : Host galaxies of 2MASS-QSOs with z≤3 (Hutchings+, 2003)
J/ApJ/560/566 : K-band galaxy luminosity function from 2MASS (Kochanek+, 2001)
http://tdc-www.cfa.harvard.edu/2mrs/ : 2MRS at the SAO telescope data center
http://www.ipac.caltech.edu/2mass/ : 2MASS home page at IPAC
http://www.aao.gov.au/local/www/6df/ : 6dF Galaxy Survey home page
http://www-wfau.roe.ac.uk/6dFGS/ : 6dF Galaxy Redshift Survey -DR3
http://www.sdss3.org/ : SDSS-III home page
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- ID 2MASS ID from XSC (Cat. VII/233) or 2MASS
Large Galaxy Atlas (LGA) databases (Jarrett
et al. 2003AJ....125..525J 2003AJ....125..525J)
18- 26 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
28- 36 F9.5 deg DEdeg Declination in decimal degrees (J2000)
38- 46 F9.5 deg GLON Galactic longitude
48- 56 F9.5 deg GLAT Galactic latitude
58- 63 F6.3 mag Kcmag Extinction-corrected 2MASS Ks magnitude (1)
65- 70 F6.3 mag Hcmag Extinction-corrected 2MASS H magnitude (1)
72- 77 F6.3 mag Jcmag ?=99.999 Extinction-corrected 2MASS J mag. (1)
79- 84 F6.3 mag Ktmag Extinction-corrected total extrapolated Ks mag
86- 91 F6.3 mag Htmag Extinction-corrected total extrapolated H mag
93- 98 F6.3 mag Jtmag Extinction-corrected total extrapolated J mag
100-104 F5.3 mag e_Kcmag Uncertainty in Kcmag
106-110 F5.3 mag e_Hcmag Uncertainty in Hcmag
112-116 F5.3 mag e_Jcmag ?=9.999 Uncertainty in Jcmag
118-122 F5.3 mag e_Ktmag Uncertainty in Ktmag
124-128 F5.3 mag e_Htmag Uncertainty in Htmag
130-134 F5.3 mag e_Jtmag Uncertainty in Jtmag
136-140 F5.3 mag E(B-V) Foreground galactic extinction (2)
142-146 F5.3 [arcsec] Riso Log of K=20 mag/sq arcsec elliptical isophote
semimajor axis
148-152 F5.3 [arcsec] Rext Log of total elliptical aperture semimajor axis
154-158 F5.3 --- b/a Axis ratio of the J+H+Ks co-added image at the
3σ isophote
160-163 A4 --- flags [Z0-6n] 2MASS XSC pipeline photometric
confusion flags (3)
165-169 A5 --- type Morphological type, expressed using the ZCAT
convention (G1)
171-172 A2 --- r_type Source of morphological type (4)
174-178 I5 km/s cz ? Redshift, corrected to solar system
barycenter reference frame
180-182 I3 km/s e_cz ? Uncertainty in cz
184 A1 --- n_cz Code for source of cz (G2)
186-204 A19 --- r_cz Reference for cz; see table4.dat file
206-233 A28 --- CAT Galaxy identification in input redshift catalog
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Note (1): measured at the K=20mag/sq.arcsec isophote.
Note (2): From Schlegel, Finkbeiner & Davis (1998ApJ...500..525S 1998ApJ...500..525S).
Note (3): concatenation of 2MASS XSC pipeline photometry flags cc_flg
(kflgk20fe, hflgk20fe, jflgk20fe). A "Z" in the first character
indicates galaxy photometry comes from the 2MASS Large Galaxy Atlas.
The figures are, from the 2MASX (Cat. VII/233):
0 = no other sources within aperture used
1 = aperture contained pixels masked off in coadd
2 = aperture contained pixels masked off due to neighboring sources
3 = aperture contained pixels that had a point source flux subtracted off
4 = aperture contained pixels within bright star mask
5 = aperture contained pixels masked off due to persistence
6 = aperture ran into coadd boundary
n = not found in the filter
Note (4): Morphological type source as follows:
JH = newly typed galaxy by John Huchra
ZC = previously listed in J. Huchra's personal compilation of redshifts
(ZCAT) (from multiple sources including RC3 and NED)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Bibcode ADS bibcode (1)
21- 73 A53 --- Aut Author(s) and (year)
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Note (1): The last 12 entries are 2MRS internal codes.
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Byte-by-byte Description of file: table[67].dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- ID 2MASS ID from XSC or LGA databases (pseudo
2MASS id based on galaxy coordinates for table7)
18- 26 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
28- 36 F9.5 deg DEdeg Declination in decimal degrees (J2000)
38- 42 I5 km/s cz Redshift
44- 46 I3 km/s e_cz Uncertainty in cz
48 A1 --- n_cz Source code for cz (G2)
50- 68 A19 --- r_cz Reference for cz; see table4.dat file
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- ID 2MASS ID from XSC or LGA databases
18- 53 A36 --- Reason Reason for removal from 2MRS catalog
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- ID Original 2MASS ID from XSC or LGA databases
18- 23 F6.3 mag Komag Original Ks isophotal magnitude
25- 29 F5.3 [arcsec] Roiso Log of original Ks=20mag/sq arcsec
isophotal radius
31- 35 F5.3 --- b/ao Original axis ratio of the J+H+Ks co-added
image at the 3σ isophote
37- 52 A16 --- 2MRS Reprocessed 2MASS ID (HHMMSSss+DDMMSSs)
54- 59 F6.3 mag Kmag Reprocessed Ks isophotal magnitude (1)
61- 65 F5.3 [arcsec] Riso Log of reprocessed Ks=20mag/sq arcsec
isophotal radius
67- 71 F5.3 --- b/a Reprocessed axis ratio of the J+H+Ks co-added
image at the 3σ isophote
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Note (1): All properties of the reprocessed galaxies are listed in Table 3 under
the corresponding 2MASS ID. The contents of this Table are only
intended to provide an overview of the changes due to reprocessing.
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Byte-by-byte Description of file: table10.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- ID 2MASS ID of galaxy (1)
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Note (1): All properties of the flagged galaxies are listed in Table 3. This
Table is only intended to provide an index of the galaxies with
suspect photometry.
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Byte-by-byte Description of file: table11.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- ID 2MASS ID of galaxy (1)
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Note (1): These galaxies are not part of our catalog and therefore we do not
list their photometric properties. This Table is only intended to
provide other users of the 2MASS XSC an index of galaxies that we
consider to have compromised photometry.
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Byte-by-byte Description of file: table12.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- ID 2MASS ID from XSC or LGA databases
18- 22 I5 km/s czNED ? Default NED redshift
24- 26 I3 km/s e_czNED ? Reported uncertainty in czNED
28- 31 A4 --- q_czNED Qualifier for czNED (1)
33- 51 A19 --- r_czNED Bibliographic code for czNED
53- 57 I5 km/s cz Alternative redshift adopted by 2MRS
59- 61 I3 km/s e_cz ? Reported uncertainty in cz
63 A1 --- f_cz Source code for cz (G2)
65- 67 F3.1 arcmin sep Angular separation (2)
69- 87 A19 --- r_cz Reference for cz; see table4.dat file
89-166 A78 --- n_cz Comment on choice of cz
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Note (1): Qualifier as follows:
PRED = "predicted" redshift listed in NED
PHOT = photometric redshift listed in NED
Note (2): Between 2MASS source and alternative redshift entry in original
publication.
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Byte-by-byte Description of file: table13.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- ID 2MASS ID from XSC or LGA databases
18- 22 I5 km/s cz Alternative redshift
24- 26 I3 km/s e_cz ? Reported uncertainty cz
28 A1 --- n_cz Source code for cz (G2)
30- 48 A19 --- r_cz Reference for cz; see table4.dat file
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Global notes:
Note (G1): the morphological information is encoded following the 5-digit ZCAT
convention (I2, A1, I1, A1) (T-type, bar, luminosity class, pecularities)
-------------------------------------------------------------
(1) T-type
-------------------------------------------------------------
-9 = QSO/AGN
-7 = Unclassified Elliptical
-6 = Compact Elliptical
-5 = E, and dwarf E
-4 = E/S0
-3 = L-, S0-
-2 = L, S0
-1 = L+, S0+
0 = S0/a, S0-a
1 = Sa
2 = Sab
3 = Sb
4 = Sbc
5 = Sc
6 = Scd
7 = Sd
8 = Sdm
9 = Sm
10 = Im, Irr I, Magellanic Irregular, Dwarf Irregular
11 = Compact Irregular, Extragalactic HII Region
12 = Extragalactic HI cloud (no galaxy visible)
15 = Peculiar, Unclassifiable
16 = Irr II
19 = Unclassified galaxy (visually confirmed to be a galaxy, but not typed)
20 = S..., Sc-Irr, Unclassified Spiral
98 = Galaxy that has never been visually examined.
-------------------------------------------------------------
(2) Bar type
-------------------------------------------------------------
A = unbarred (A)
X = mixed type (AB)
B = barred (B)
-------------------------------------------------------------
(3) Luminosity classes (for spirals and irregulars)
-------------------------------------------------------------
1 = I
2 = I-II
3 = II
4 = II-II
5 = III
6 = III-IV
7 = IV
8 = IV-V
9 = V
-------------------------------------------------------------
(4) Peculiarities
-------------------------------------------------------------
D = Double or Multiple
P = Peculiar
R = Outer Ring
r = Inner Ring
s = S-shaped
t = Mixed (Inner ring/S-shaped)
T = Pseudo outer ring
/ = Spindle
-------------------------------------------------------------
Note (G2): Provenance of redshift as follows:
C = CTIO (Cerro-Tololo)
D = McDonald Obs. (Texas)
F = FLWO (Fred Lawrence Whipple Observatory, Arizona)
M = alternative NED redshift
N = default NED redshift
O = alternative redshift from ZCAT (Previous observations by Huchra and
collaborators)
S = SDSS-DR8 (see Cat. II/306)
6 = 6dFGS-DR3 (see Cat. VII/259)
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 11-Jun-2012