J/AJ/131/2426 Optical and radio study of Abell 2111 (Miller+, 2006)
Abell 2111: an optical and radio study of the richest Butcher-Oemler cluster. Miller N.A., Oegerle W.R., Hill J.M. <Astron. J., 131, 2426-2441 (2006)> =2006AJ....131.2426M
ADC_Keywords: Clusters, galaxy ; Redshifts ; Photometry, SDSS ; Galaxies, radio Keywords: galaxies: clusters: general - galaxies: clusters: individual (Abell 2111) - galaxies: evolution - radio continuum: galaxies Abstract: We present an in-depth analysis of the Butcher-Oemler cluster A2111, including new optical spectroscopy plus a deep Very Large Array (VLA) radio continuum observation. These are combined with optical imaging from the Sloan Digital Sky Survey (SDSS) to assess the activity and properties of member galaxies. Prior X-ray studies have suggested A2111 to be a head-on cluster merger, a dynamical state that might be connected to the high level of activity inferred from its blue fraction. We are able to directly assess this claim, using our spectroscopic data to identify 95 cluster members among 196 total galaxy spectra. We are able to detect 175 optical sources from the SDSS in our VLA radio data, of which 35 have redshift information. Description: Galaxy spectra within the field of A2111 were obtained using the Hydra multifiber spectrograph on the Wisconsin-Indiana-Yale-NOAO (WIYN) 3.5m telescope in 1996. Briefly, three fiber configurations were observed during 1996 May 20-22, with a fourth observed on 1996 June 10-11. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 77 205 Velocity data from optical spectroscopy table2.dat 60 175 Radio sources with optical counterparts (separation radio/optical < 1.5arcsec) table3.dat 74 95 Spectroscopic classifications of cluster members (Tables 3 and 4 of the paper)
See also: http://www.sdss.org : SDSS Home Page J/ApJS/146/267 : Very rich Abell clusters radio analysis (Morrison+ 2003) J/ApJS/122/51 : Spectroscopic catalog of 10 rich galaxy clusters (Dressler+ 1999) J/AJ/118/625 : Radio sources in Abell 2125 and 2645 (Dwarakanath+ 1999) J/AJ/116/1529 : cD clusters of galaxies. III. (Hill+, 1998) J/AJ/124/2453 : Spectroscopy of active galaxies in nearby clusters (Miller+, 2002) J/ApJ/613/841 : Redshifts in A2125 (Miller+, 2004) J/AJ/129/31 : A deep radio survey of Abell 2125. II (Owen+, 2005) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Hour of Right Ascension (J2000) 4- 5 I2 min RAm Minute of Right Ascension (J2000) 7- 11 F5.2 s RAs Second of Right Ascension (J2000) 13 A1 --- DE- Sign of the Declination (J2000) 14- 15 I2 deg DEd Degree of Declination (J2000) 17- 18 I2 arcmin DEm Arcminute of Declination (J2000) 20- 23 F4.1 arcsec DEs Arcsecond of Declination (J2000) 25- 30 I6 km/s cz Heliocentric radial velocity 32- 34 A3 --- f_cz Flag(s) on cz (1) 36- 37 I2 km/s e_cz Error in cz 39- 77 A39 --- Line Observed line(s) (2)
Note (1): Flag on cz, defined as follows: a = A consistent velocity was found for this galaxy via cross correlation of absorption features with velocity standards. b = A velocity for this galaxy is also reported in NED. c = A velocity for this galaxy is also in the SDSS DR4. Note (2): When a velocity has been determined on the basis of emission lines, these lines are noted in this column. If identified lines are offset by parentheses, they were not used to determine the reported velocity but were found to be consistent with that velocity. Note that [OIII] usually refers to the λ5007 line, but sometimes also includes the λ4959 line. Similarly, [NII] is usually the λ6584 line but may also include the λ6548 line and [SII] may be either or both of λ6717 and λ6731.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Hour of Right Ascension (J2000) 4- 5 I2 min RAm Minute of Right Ascension (J2000) 7- 11 F5.2 s RAs Second of Right Ascension (J2000) 12 A1 --- DE- Sign of the Declination (J2000) 13- 14 I2 deg DEd Degree of Declination (J2000) 16- 17 I2 arcmin DEm Arcminute of Declination (J2000) 19- 22 F4.1 arcsec DEs Arcsecond of Declination (J2000) 24- 29 F6.4 --- z Redshift (photometric for sources without spectroscopy) 31 A1 --- r_z Reference for z (1) 33- 37 F5.2 mag rmag SDSS r band magnitude 39 A1 --- f_rmag [a] Classified as star in SDSS photometric data 41- 45 I5 uJy S1.4 The 1.4GHz flux density 47 A1 --- f_S1.4 [de] Note for extended sources (3) 49- 51 I3 uJy e_S1.4 Error in S1.4GHz 53- 54 I2 uJy rms The rms sensitivity 56 A1 --- Res [RU] Resolved (R) or unresolved (U) (4) 58- 60 F3.1 arcsec Sep Separation
Note (1): Reference for z, defined as follows: b = Redshift from SDSS DR4; c = Redshift from Morrison et al. (2003, Cat. J/ApJS/146/267). Note (3): Flag on S1.4GHz, defined as follows: d = Extended radio galaxy with morphology of a compact double, with flux calculated by TVSTAT. The separation listed is for the midpoint of the two radio lobes relative to the optical position. There is additional diffuse to the southeast, possibly associated with the galaxy. Including this emission the total flux is 19.8mJy with an error of 0.5mJy. The galaxy and its radio emission are depicted in Figure 9. e = Extended radio source, TVSTAT. Note (4): Sources for which the fitted major axis had a minimum size of zero were considered unresolved, and their peak flux measurements were adopted as their flux; otherwise, the fitted integral flux was adopted.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Hour of Right Ascension (J2000) 4- 5 I2 min RAm Minute of Right Ascension (J2000) 7- 11 F5.2 s RAs Second of Right Ascension (J2000) 13 A1 --- DE- Sign of the Declination (J2000) 14- 15 I2 deg DEd Degree of Declination (J2000) 17- 18 I2 arcmin DEm Arcminute of Declination (J2000) 20- 23 F4.1 arcsec DEs Arcsecond of Declination (J2000) 25- 28 A4 --- Class Source class (1) 30- 33 F4.1 --- S/N Signal-to-noise per resolution element near Hδ 35 A1 --- Color [BR] Color type (2) 37- 40 F4.2 Mpc Dist Distance from cluster center 42 A1 --- Radio [DNO] Radio detection (3) 44- 49 F6.4 --- z ? Redshift 51- 56 F6.2 mag RMAG ? Absolute R magnitude (4) 58- 62 F5.2 mag D(g-r) ? Color relative to the cluster color-magnitude relation (4) 64- 68 F5.2 [W/Hz] log(L1.4) ? Log of the 1.4GHz luminosity (4) 70- 73 F4.1 solMass/yr SFR ? Star formation rate (4) 74 A1 --- f_SFR [a] AGN likelihood (4) (5)
Note (1): Source class, defined as follows: e(a) = star-forming galaxies with strong Hδ absorption e(c) = galaxies with spectra representative of continuous star formation histories evidenced by moderate [OII] emission and at most slight Hδ absorption e(n) = galaxies with line widths and other lines such as [OIII] indicating an AGN k = passive galaxies, lacking emission lines k+a = strong Hδ absorption caused by a large population of young A stars Note (2): Color type, defined as follows: R = consistent with red sequence; B = blue in Butcher & Oemler (1984ApJ...285..426B) sense (i.e., Δ(g-r)≤-0.2). Note (3): Radio detection, defined as follows: N = non-detected; D = detected; O = outside surveyed area. Note (4): Additional data from Table 4. Note (5): Based on the color and/or optical spectrum, this galaxy is likely to have an AGN, and hence the SFR is an upper limit due to inclusion of radio emission associated with the active nucleus.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 17-Aug-2007
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