J/MNRAS/376/125 Morphologies and photometry in A2218 (Sanchez+, 2007)
Morphologies and stellar populations of galaxies in the core of Abell 2218.
Sanchez S.F., Cardiel N., Verheijen M.A.W., Pedraz S., Covone G.
<Mon. Not. R. Astron. Soc., 376, 125-150 (2007)>
=2007MNRAS.376..125S 2007MNRAS.376..125S
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Morphology
Keywords: techniques: spectroscopic -
galaxies: clusters: individual: Abell 2218 -
galaxies: elliptical and lenticular, cD -
galaxies: fundamental parameters - galaxies: spiral -
galaxies: stellar content
Abstract:
We present a study of the stellar populations and morphologies of
galaxies in the core of the galaxy cluster Abell 2218. Integral field
spectroscopy (IFS) observations were performed using PMAS in the PPAK
mode covering a field of view of ∼74x64arcsec2 centred on the core
of the cluster, in order to obtain spectroscopy of an unbiased
flux-limited sample of cluster galaxies. 43 objects were detected in
the IFS data, 31 of them with enough signal-to-noise ratio to derive
the redshift, all of them brighter than I<21.5mag. 28 are at the
redshift of the cluster (17 with previously unknown redshift).
Individual spectra of the cluster members were extracted and compared
with single stellar population models to derive the
luminosity-weighted ages and metallicities. In addition, deep Hubble
Space Telescope (HST)/ACS F475W-, F555W-, F625W- and F850LP-band
images centred on the cluster core were obtained from the HST archive
(zlim∼28mag). A detailed morphological analysis of all the galaxies
within the field of view of these images down to zlim<22.5mag was
performed classifying them as late-type, intermediate and early-type,
on the basis of their Sersic indices. The literature was scanned to
look for spectroscopically confirmed cluster members located within
the field of view of the ACS image. The final sample of 59 galaxies
comprises our reported sample of 28 galaxies in the core, and 31
additional galaxies in the outer regions. In addition, multiband
broad-band photometry was extracted from the literature for all
objects.
Description:
Observations were carried out on 2005 June 30 and July 6 at the 3.5-m
telescope at Calar Alto Observatory with the Potsdam MultiAperture
Spectrograph, PMAS, in the PPAK mode.
We obtained publicly available HST/ACS images of the cluster in the
F475W, F555W, F625W, F775W and F850LP bands from the HST archive.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 37 5 Summary of the HST/ACS images
table2.dat 82 56 Summary of the photometric analysis
table3.dat 64 59 Summary of the morphological analysis
table4.dat 64 28 Summary of the parameters derived from the spectra
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See also:
J/AJ/130/1002 : Stroemgren photometry in Abell 2125 and 2218 (Rakos+, 2005)
J/A+A/407/791 : ACO 370, 2218 and 2390 fluxes at 7 and 15um (Metcalfe+, 2003)
J/MNRAS/323/839 : HST photometry of A2218 early-type galaxies (Smail+, 2001)
J/AJ/98/1148 : VLA survey of 0016+16, Abell 665 and 2218 (Moffet+, 1989)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Filt Filter
8- 15 F8.3 0.1nm Lambda Pivot lambda
17- 22 F6.2 0.1nm Width Wavelength width
24- 25 I2 --- NFrame Number of frames
27- 31 I5 s ExpTime Exposure time
33- 37 F5.2 mag maglim Limiting magnitude (15sigma)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [SCV2007] Sequential number
5- 15 F11.7 deg RAdeg Right ascension in decimal degrees (J2000)
17- 27 F11.7 deg DEdeg Declination in decimal degrees
29- 33 F5.2 mag Bmag ?=- B (F475W) magnitude
35- 38 F4.2 mag e_Bmag ?=- rms uncertainty on Bmag
40- 44 F5.2 mag Vmag ?=- V (F555W) magnitude
46- 49 F4.2 mag e_Vmag ?=- rms uncertainty on Vmag
51- 55 F5.2 mag Rmag ?=- R (F625W) magnitude
57- 60 F4.2 mag e_Rmag ?=- rms uncertainty on Rmag
62- 66 F5.2 mag Imag ?=- I (F775W) magnitude
68- 71 F4.2 mag e_Imag ?=- rms uncertainty on Imag
73- 77 F5.2 mag zmag z (F850LP) magnitude
79- 82 F4.2 mag e_zmag rms uncertainty on zmag
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [SCV2007] Sequential number
5- 9 F5.3 --- chi2/nu chi2/nu of fitting procedure
11- 15 F5.2 mag zmag z (F850LP) magnitude
17- 20 F4.2 mag e_zmag rms uncertainty on zmag
22- 26 F5.2 arcsec Re Effective radius
28- 31 F4.2 arcsec e_Re rms uncertainty on Re
33- 36 F4.2 --- a/b a/b axis ratio
38- 41 F4.2 --- e_a/b rms uncertainty on a/b
43- 45 I3 deg PA [-90/90] Position angle
47- 48 I2 deg e_PA rms uncertainty on PA
50- 53 F4.2 --- nSer Sersic number
55- 58 F4.2 --- e_nSer rms uncertainty on nSer
60- 64 F5.3 --- A Asymmetry index
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- IFU IFU identification number
4- 6 I3 --- [SCV2007] SExtractor Sequential number
8- 12 F5.3 --- z ?=- Redshift
13 A1 --- u_z [?] Uncertainty flag on z
15- 17 F3.1 0.1nm Hb ?=- Hβ index
18 A1 --- u_Hb Uncertainty flag on Hb
20- 22 F3.1 0.1nm e_Hb ?=- rms uncertainty on Hb
23 A1 --- ueHb Uncertainty flag on e_Hb
25- 27 F3.1 0.1nm Mgb ?=- Mgb index
28 A1 --- u_Mgb Uncertainty flag on Mgb
30- 32 F3.1 0.1nm e_Mgb ?=- rms uncertainty on Mgb
33 A1 --- ueMgb Uncertainty flag on e_Mgb
35- 38 F4.1 Gyr Age Age
40- 42 F3.1 Gyr e_Age rms uncertainty on Age
44- 48 F5.3 --- Z Metallicity
50- 54 F5.3 --- e_Z rms uncertainty on Z
56- 60 F5.1 10+10solMass Mass Mass
62- 64 F3.1 10+10solMass e_Mass rms uncertainty on Mass
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 28-Sep-2007