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J/AJ/132/2243   Infrared properties of close pairs of galaxies   (Geller+, 2006)

Infrared properties of close pairs of galaxies. Geller M.J., Kenyon S.J., Barton E.J., Jarrett T.H., Kewley L.J. <Astron. J., 132, 2243-2259 (2006)> =2006AJ....132.2243G
ADC_Keywords: Galaxies, IR ; Photometry, infrared Keywords: galaxies: interactions - galaxies: photometry - galaxies: starburst Abstract: We discuss spectroscopy and IR photometry for a complete sample of ∼800 galaxies in close pairs objectively selected from the second Center for Astrophysics redshift survey. We use the Two Micron All Sky Survey to compare near-IR color-color diagrams for our sample with the Nearby Field Galaxy Sample and with a set of IRAS flux-limited pairs from Surace and coworkers. We construct a basic statistical model to explore the physical sources of the substantial differences among these samples. The model explains the spread of near-IR colors and is consistent with a picture in which central star formation is triggered by the galaxy-galaxy interaction before a merger occurs. For 160 galaxies we report new, deep JHK photometry within our spectroscopic aperture, and we use the combined spectroscopic and photometric data to explore the physical conditions in the central bursts. Description: We downloaded JHKs from the 2MASS extended source catalog using the Infrared Science Archive (IRSA) Web interface at IPAC.1 All 791 galaxies in the complete pairs sample are detected. We acquired JHK images of 160 pair galaxies in the sample of Barton Gillespie et al. (2003, Cat. J/ApJ/582/668) along with standard stars. These pairs are a random selection of the Baront et al. (2000ApJ...530..660B) pairs. We used several NIR cameras at the Fred L. Whipple Observatory 1.2m and the Kitt Peak National Observatory 2.1m telescopes. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 60 791 2MASS Infrared Photometry table2.dat 44 8 Journal of observations table3.dat 50 160 BGK Infrared Photometry (Cat. J/ApJ/582/668) table4.dat 57 368 IRAS mid-infrared photometry table5.dat 53 4 BGK00 pairs ((2000ApJ...530..660B) brighter than Surace flux limits
See also: J/ApJ/582/668 : Colours and Hα in galaxy pairs (Barton Gillespie+, 2003) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 16 A16 --- 2MASX The J2000 Designation (HHMMSSss+DDMMSSs) 18- 22 I5 km/s cz Heliocentric radial velocity 24- 28 F5.2 mag Jmag7 2MASS J band 7" aperture magnitude 30- 34 F5.2 mag Hmag7 2MASS H band 7" aperture magnitude 36- 40 F5.2 mag Kmag7 2MASS Ks band 7" aperture magnitude 42- 46 F5.2 mag Jmagiso 2MASS J band 20mag/arcsec2 isophotal elliptical magnitude 48- 52 F5.2 mag Hmagiso 2MASS H band 20mag/arcsec2 isophotal elliptical magnitude 54- 58 F5.2 mag Kmagiso 2MASS Ks band 20mag/arcsec2 isophotal elliptical magnitude 60 A1 --- f_2MASX [+*] Flag (1)
Note (1): Flag as follows: * = a previously unresolved object. + = undetected or confused with nearby stars or nearby non-pair galaxies. Reanalyzed by T.H.J.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 10 A10 "Y/M/D" Date UT Date of observation 11 A1 --- --- [-] 12- 21 A10 "Y/M/D" Date2 Second UT date of observation 23- 26 A4 --- Tel Telescope 28- 36 A9 --- IR IR Imager 38- 40 I3 arcsec Field1 Field of view 41 A1 --- --- [x] 42- 44 I3 arcsec Field2 Field of view
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 16 A16 --- 2MASX The J2000 Designation (HHMMSSss+DDMMSSs) 18- 21 F4.1 arcsec Length Slit length 23- 25 F3.1 arcsec Width Slit width 27- 30 F4.1 deg PA Position angle 32- 36 F5.2 mag Jmag The J band slit magnitude 38- 42 F5.2 mag Hmag The H band slit magnitude 44- 48 F5.2 mag Kmag The K band slit magnitude 50 A1 --- f_2MASX [*] Galaxies without optical spectrum (1)
Note (1): These nine galaxies are without optical spectra so we adopted the median slit length, 20", and the typical position angle of 90°. The colors of these galaxies span the range of J-H and H-K colors of other galaxies in the sample.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 16 A16 --- 2MASX The J2000 Designation (HHMMSSss+DDMMSSs) 18- 27 A10 --- IRAS The IRAS Designation (1) 29 A1 --- l_S12um Limit flag on S12um (quality flag 1) 30- 33 F4.2 Jy S12um IRAS 12 micron flux density 34 A1 --- u_S12um [:] : for approximate flux (quality flag 2) 36 A1 --- l_S25um Limit flag on S25um (quality flag 1) 37- 40 F4.2 Jy S25um IRAS 25 micron flux density 41 A1 --- u_S25um [:] : for approximate flux (quality flag 2) 43 A1 --- l_S60um Limit flag on S60um (quality flag 1) 44- 48 F5.2 Jy S60um IRAS 60 micron flux density 49 A1 --- u_S60um [:] : for approximate flux (quality flag 2) 51 A1 --- l_S100um Limit flag on S100um (quality flag 1) 52- 56 F5.2 Jy S100um IRAS 100 micron flux density 57 A1 --- u_S100um [:] : for approximate flux (quality flag 2)
Note (1): To preserve associations of IRAS detections with pair galaxies, we list IRAS associations for each galaxy in the pair. This listing duplicates flux measurements for pair galaxies where IRAS could not spatially resolve the pair.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 19 A19 --- Pair Pair designation (HHMMSS.ss+DDMMSS.ss) 21- 30 A10 --- IRAS IRAS name 32- 35 F4.2 Jy F12um Flux at 12um 36 A1 --- u_F12um Uncertainty flag on F12um 38- 41 F4.2 Jy F25um Flux at 25um 43- 47 F5.2 Jy F60um Flux at 60um 49- 53 F5.2 Jy F100um Flux at 100um
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 25-Jul-2008
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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