J/A+A/588/A105 Abell 983 and Abell 1731 NIR fluxes (Bianconi+, 2016)
Star formation and black hole accretion activity in rich local clusters of
galaxies.
Bianconi M., Marleau F., Fadda D.
<Astron. Astrophys. 588, A105 (2016)>
=2016A&A...588A.105B 2016A&A...588A.105B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Photometry, infrared
Keywords: infrared: galaxies - galaxies: star formation - galaxies: active -
galaxies: clusters: individual: Abell 983 -
galaxies: clusters: individual: Abell 1731 - galaxies: evolution
Abstract:
We present a study of star formation and central black hole accretion
activity of galaxies that are hosted in the two nearby (z∼0.2) rich
galaxy clusters Abell 983 and 1731.
We aim to quantify both the obscured and unobscured star formation
rates, as well as the presence of active galactic nuclei (AGN) as a
function of the environment in which the galaxy is located.
We targeted the clusters with unprecedented deep infrared Spitzer
observations (0.2mJy @ 24-micron), near-IR Palomar imaging and
optical WIYN spectroscopy. The extent of our observations (∼3 virial
radii) covers the vast of possible environments, from the very dense
cluster centre to the very rarefied cluster outskirts and accretion
regions.
The star-forming members of the two clusters present star formation
rates that are comparable with those measured in coeval field
galaxies. Analysis of the spatial arrangement of the spectroscopically
confirmed members reveals an elongated distribution for A1731 with
respect to the more uniform distribution of A983. The emerging picture
is compatible with A983 being a fully evolved cluster, in contrast
with the still actively accreting A1731.
Analysis of the specific star formation rate reveals evidence of
ongoing galaxy pre-processing along A1731's filament-like structure.
Furthermore, the decrease in the number of star-forming galaxies and
AGN towards the cluster cores suggests that the cluster environment is
accelerating the ageing process of the galaxies and blocking further
accretion of the cold gas that fuels both star formation and black
hole accretion activity.
Description:
The galaxy clusters A983 and A1731 were observed as part of the
Spitzer program 20512 (PI: Dario Fadda).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
a1731.dat 533 7859 Abell 1731 sources catalogue
a983.dat 533 7043 Abell 983 sources catalogue
list.dat 106 18 List of fits maps
fits/* . 18 Individual fits maps
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Byte-by-byte Description of file: a1731.dat a983.dat
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Bytes Format Units Label Explanations
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1- 4 I4 -- ID Number of the source
6- 7 I2 h RAh Right ascension (J2000)
9- 10 I2 min RAm Right ascension (J2000)
12- 17 F6.3 s RAs Right ascension (J2000)
19 A1 --- DE- Declination sign (J2000)
20- 21 I2 deg DEd Declination (J2000)
23- 24 I2 arcmin DEm Declination (J2000)
26- 30 F5.2 arcsec DEs Declination (J2000)
32- 53 F22.16 uJy F24 MIPS 24 um flux density
55- 76 F22.15 uJy e_F24 Error in F24
78- 89 E12.8 uJy FNUV ?=-9.999 Near-UV flux density
91-102 E12.8 uJy e_FNUV ?=-9.999 Error in F_NUV
104-115 E12.8 uJy Fu' ?=-9.999 SDSS u' flux density
117-128 E12.8 uJy e_Fu' ?=-9.999 Error in u'
130-141 E12.8 uJy Fg' ?=-9.999 SDSS g' flux density
143-154 E12.8 uJy e_Fg' ?=-9.999 Error in g'
156-167 E12.8 uJy Fr' ?=-9.999 SDSS r' flux density
169-180 E12.8 uJy e_Fr' ?=-9.999 Error in r'
182-193 E12.8 uJy Fi' ?=-9.999 SDSS i' flux density
195-206 E12.8 uJy e_Fi' ?=-9.999 Error in i'
208-219 E12.8 uJy Fz' ?=-9.999 SDSS z' flux density
221-232 E12.8 uJy e_Fz' ?=-9.999 Error in z'
234-245 E12.8 uJy FJ ?=-9.999 WIRC J flux density
247-258 E12.8 uJy e_FJ ?=-9.999 Error in F_J
260-271 E12.8 uJy FH ?=-9.999 WIRC H flux density
273-284 E12.8 uJy e_FH ?=-9.999 Error in F_H
286-297 E12.8 uJy FKs ?=-9.999 WIRC Ks flux density
299-310 E12.8 uJy e_FKs ?=-9.999 Error in F_ks
312-325 F14.8 uJy F3.6 ?=-9.999 IRAC 3.6 um flux density
327-335 F9.6 uJy e_F3.6 ?=-9.999 Error in F3.6
337-348 E12.8 uJy FW1 ?=-9.999 WISE W1 flux density
350-361 E12.8 uJy e_FW1 ?=-9.999 Error in FW1
363-375 F13.7 uJy F4.5 ?=-9.999 IRAC 4.5 um flux density
377-385 F9.6 uJy e_F4.5 ?=-9.999 Error in F4.5
387-398 E12.8 uJy FW2 ?=-9.999 WISE W2 flux density
400-411 E12.8 uJy e_FW2 ?=-9.999 Error in FW2
413-425 F13.7 uJy F5.8 ?=-9.999 IRAC 5.8 um flux density
427-435 F9.6 uJy e_F5.8 ?=-9.999 Error in F58
437-449 F13.7 uJy F8 ?=-9.999 IRAC 8 um flux density
451-461 F11.6 uJy e_F8 ?=-9.999 Error in F8
463-476 F14.6 uJy F70 ?=-9.999 MIPS 70 um flux density
478-489 F12.6 uJy e_F70 ?=-9.999 Error in F70
491-503 F13.6 uJy F160 ?=-9.999 MIPS 160 um flux density
505-515 F11.6 uJy e_F160 ?=-9.999 Error in F160
517-533 F17.12 --- SNRAP ?=- Signal-to-noise ratio in MIPS 24um image
in 6-arcsec aperture diameter
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 23 F4.2 arcsec/pix scale ? Scale of the image
25- 28 I4 --- Nx Number of pixels along X-axis
30- 33 I4 --- Ny Number of pixels along Y-axis
35- 39 I5 Kibyte size Size of FITS file
41- 69 A29 --- FileName Name of FITS file, in subdirectory fits
71-106 A36 --- Title Title of the FITS file
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Acknowledgements:
Matteo Bianconi, matteo.bianconi(at)uibk.ac.at
(End) Patricia Vannier [CDS] 07-Mar-2016