J/ApJ/800/93 Wide field ugriz photometry of 0.06<z<0.4 AGNs (Scott+, 2015)
Wide field multiband imaging of low redshift quasar environments.
Scott J.E., Rafiee A., Bechtold J., Ellingson E., Thibodeau C., Richmond M.
<Astrophys. J., 800, 93 (2015)>
=2015ApJ...800...93S 2015ApJ...800...93S
ADC_Keywords: Active gal. nuclei ; QSOs ; Photometry, SDSS
Keywords: galaxies: active; large-scale structure of universe
Abstract:
We present photometry of the large-scale environments of a sample of
12 broad line active galactic nuclei (AGNs) with 0.06<z<0.37 from deep
images in the Sloan Digital Sky Survey u, g, r, and i filters taken
with the 90Prime prime focus camera on the Steward Observatory Bok
Telescope. We measure galaxy clustering around these AGNs using two
standard techniques: correlation amplitude (Bgq) and the two point
correlation function. We find average correlation amplitudes for the
10 radio-quiet objects in the sample equal to (9±18, 144±114,
-39±56, 295±260)Mpc1.77 in (u, g, r, i), all consistent with the
expectation from galaxy clustering. Using a ratio of the galaxy-quasar
cross-correlation function to the galaxy autocorrelation function, we
calculate the relative bias of galaxies and AGNs, bgq. The bias in
the u band, bgq=3.08±0.51 is larger compared to that calculated in
the other bands, but it does not correlate with AGN luminosity, black
hole mass, or AGN activity via the luminosity of the [OIII] emission
line. Thus ongoing nuclear accretion activity is not reflected in the
large scale environments from ∼10h-1kpc to ∼0.5h-1Mpc and may
indicate a non-merger mode of AGN activity and/or a significant delay
between galaxy mergers and nuclear activity in this sample of mostly
radio-quiet quasars.
Description:
We made our observations with the 90Prime prime focus imager on the
2.3m Bok Telescope at Kitt Peak National Observatory in 2008 Jan-Jun.
We used the SDSS u, g, r, and i filters for the photometry, and with
the exception of HS0624+690, all our fields lie inside the SDSS
footprint. However, our photometry is significantly deeper than that
of the SDSS survey.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 70 12 "90Prime" observations of quasars
table2.dat 129 68630 "90Prime" catalog of galaxies in quasar fields
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See also:
VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)
II/301 : The DEEP2-DR1 Photometric Catalog (Coil+ 2004)
J/A+A/545/A15 : AMIGA XI. Optical nuclear activity (Sabater+, 2012)
J/A+A/534/A109 : MCXC Meta-Catalogue X-ray galaxy Clusters (Piffaretti+, 2011)
J/ApJS/191/254 : GMBCG galaxy cluster catalog from SDSS DR7 (Hao+, 2010)
J/ApJS/182/628 : Spitzer quasar and ULIRG evolution study (Veilleux+, 2009)
J/MNRAS/395/255 : Compact groups of galaxies in SDSS DR6 (McConnachie+, 2009)
J/ApJ/691/705 : AGN host galaxy morphologies in COSMOS (Gabor+, 2009)
J/ApJ/660/239 : MaxBCG catalog of galaxy clusters from SDSS (Koester+, 2007)
J/AJ/133/2222 : Clustering of high-redshift QSOs from SDSS (Shen+, 2007)
J/ApJ/658/99 : Pairs of QSO in SDSS-DR4 (Myers+, 2007)
J/ApJ/654/115 : DEEP2 Galaxy Redshift Survey: SDSS QSOs (Coil+, 2007)
J/AJ/131/1 : Binary quasars in the SDSS (Hennawi+, 2006)
J/ApJ/613/682 : AGN central mass & broad-line region sizes (Peterson+, 2004)
J/PASP/106/646 : HST QSO absorption-line key project VIII. (Kirhakos+, 1994)
http://www.sdss.org/ : SDSS home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- QSO QSO name
12- 16 A5 --- Type Type of quasar (Veron-Cetty & Veron, 2010,
Cat. VII/258): QSO, Sy1.0, 1.2, 1.5, NLS1
18- 19 I2 h RAh Hour of right ascension (J2000)
21- 22 I2 min RAm Minute of right ascension (J2000)
24- 27 F4.1 s RAs Second of right ascension (J2000)
29 A1 --- DE- Sign of declination (J2000)
30- 31 I2 deg DEd Degree of declination (J2000)
33- 34 I2 arcmin DEm Arcminute of declination (J2000)
36- 37 I2 arcsec DEs Arcsecond of declination (J2000)
39- 43 F5.3 --- z [0.06/0.4] Redshift
45- 49 F5.2 mag rmag [14.4/16.1] r-band magnitude
50 A1 --- f_rmag b: measured from 90Prime data
52- 55 I4 s uExp [2800/9200]? u-band exposure time
57- 60 I4 s gExp [400/6400]? g-band exposure time
62- 65 I4 s rExp [400/7600] r-band exposure time
67- 70 I4 s iExp [1200/4200]? i-band exposure time
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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- 10 A10 --- QSO QSO field identifier
12- 19 F8.4 deg RAdeg Right ascension in decimal degrees (J2000)
21- 27 F7.4 deg DEdeg Declination in decimal degrees (J2000)
29 A1 --- l_umag [>-] Limit flag or non observation flag (1)
30- 34 F5.2 mag umag ?=99 SExtractor MAG BEST u band magnitude
36- 40 F5.2 mag e_umag ? Error in umag
42 A1 --- l_gmag [>-] Limit flag or non observation flag (1)
43- 47 F5.2 mag gmag ?=99 SExtractor MAG BEST g band magnitude
49- 53 F5.2 mag e_gmag ? Error in gmag
55- 59 F5.2 mag rmag [14/24.6] SExtractor MAG BEST r band magnitude
61- 64 F4.2 mag e_rmag [0/0.3] Error in rmag
66 A1 --- l_imag [>-] Limit flag or non observation flag (1)
67- 71 F5.2 mag imag ?=99 SExtractor MAG BEST i band magnitude
73- 77 F5.2 mag e_imag ? Error in imag
79- 85 F7.3 arcsec MajAxis [0.2/183] SExtractor A_WORLD major axis
87- 91 F5.3 arcsec e_MajAxis [0.009/1.8] Error in MajAxis
93- 98 F6.3 arcsec MinAxis [0.1/17] SExtractor B_WORLD minor axis
100-104 F5.3 arcsec e_MinAxis [0.008/0.5] Error in MinAxis
106-110 F5.2 --- rad [0/13.2] SExtractor KRON_RADIUS radius (2)
112-117 F6.2 deg theta [-90/90] SExtractor THETA_J2000 position angle
in units of MajAxis (2)
119-124 F6.2 arcsec FWHM [0.09/286] SExtractor FWHM_J2000 Full-Width
at Half-Maximum (2)
126-129 F4.2 --- S/G [0/1] SExtractor CLASS_STAR classification
(0=galaxy, 1=star) (2)
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Note (1):
- = non observation in filter, due to masking.
("99" is set in mag; "0" in error).
> = non detection in filter, 1σ limit is given (with no error).
Note (2): As discussed in the text and in Bertin et al. (2002ASPC..281..228B 2002ASPC..281..228B).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 01-Jul-2015