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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
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
1- 16 A16 --- ID 2MASS ID from XSC (Cat. VII/233) or 2MASS Large Galaxy Atlas (LGA) databases (Jarrett et al. 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
Note (1): measured at the K=20mag/sq.arcsec isophote. Note (2): From Schlegel, Finkbeiner & Davis (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
Bytes Format Units Label Explanations
1- 19 A19 --- Bibcode ADS bibcode (1) 21- 73 A53 --- Aut Author(s) and (year)
Note (1): The last 12 entries are 2MRS internal codes.
Byte-by-byte Description of file: table[67].dat
Bytes Format Units Label Explanations
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
Byte-by-byte Description of file: table8.dat
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
Byte-by-byte Description of file: table9.dat
Bytes Format Units Label Explanations
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
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.
Byte-by-byte Description of file: table10.dat
Bytes Format Units Label Explanations
1- 16 A16 --- ID 2MASS ID of galaxy (1)
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.
Byte-by-byte Description of file: table11.dat
Bytes Format Units Label Explanations
1- 16 A16 --- ID 2MASS ID of galaxy (1)
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.
Byte-by-byte Description of file: table12.dat
Bytes Format Units Label Explanations
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
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.
Byte-by-byte Description of file: table13.dat
Bytes Format Units Label Explanations
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
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)
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 11-Jun-2012
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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