J/AJ/121/1840 Galaxies in Q0835+580 and Q1126+101 fields (Hall+, 2001)
Galaxies in the fields of z∼1.5 radio-loud quasars.
Hall P.B., Sawicki M., Martini P., Finn R.A., Pritchet C.J., Osmer P.S.,
McCarthy D.W., Evans A.S., Lin H., Hartwick F.D.A.
<Astron. J. 121, 1840 (2001)>
=2001AJ....121.1840H 2001AJ....121.1840H
ADC_Keywords: Clusters, galaxy ; Photometry, UBV ; Photometry, infrared
Keywords: galaxies: clusters: general - galaxies: general -
quasars: individual (Q0835+580, Q1126+101, Q2149+212, Q2345+061) -
infrared radiation
Abstract:
We have previously identified an excess population of predominantly
red galaxies around a sample of 31 radio-loud quasars (RLQs) at 1<z<2.
Here we show that these fields have a surface density of extremely red
objects (EROs, with R-K>6) 2.7 times higher than the general field.
Assuming these EROs are passively evolved galaxies at the quasar
redshifts, they have characteristic luminosities of only ∼L*. Only one
of four RLQ fields has an excess of J-K-selected EROs with J-K>2.5;
thus, those objects are mostly unrelated to the quasars. We also
present new multiwavelength data and analyses on the fields of four of
these quasars at zq∼1.54, obtained to build more detailed pictures
of the environments of these quasars and the galaxies within them.
Objects:
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RA (2000) DE Designation(s)
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08 39 06.459 +57 54 17.12 QSO 0835+580
11 29 14.19 +09 51 59.6 QSO 1126+101
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 153 44 SED-fitting results
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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- 9 A9 --- Field Field (Q0835+580 or Q1126+101)
11- 13 I3 --- [HSM2001] Identification number
15- 19 F5.1 arcsec oRA Offset in right ascension
21- 25 F5.1 arcsec oDE Offset in declination
27- 31 F5.2 mag Kmag K magnitude
33- 36 F4.2 mag e_Kmag rms uncertainty on Kmag
38 A1 --- l_r-K Limit flag on r-K
39- 42 F4.2 mag r-K r-K colour index
44- 47 F4.2 mag e_r-K rms uncertainty on r-K
49- 52 F4.2 mag J-K J-K colour index
54- 58 F5.2 mag e_J-K ? rms uncertainty on J-K
60 A1 --- l_z-J Limit flag on z-J
61- 65 F5.3 mag z-J ? z-J index
68- 71 F4.2 mag e_z-J ? rms uncertainty on z-J
73 A1 --- Model [BC] Model (1)
75- 79 F5.2 --- chi2 χ2ν value
81- 84 F4.2 --- zph Photometric redshift
86- 89 F4.2 --- E_zph Error on zph (upper limit)
91- 94 F4.2 --- e_zph Error on zph (lower limit)
96- 99 F4.2 mag E(B-V) Reddening
101-104 F4.2 mag E_E(B-V) Error on E(B-V) (upper limit)
106-109 F4.2 mag e_E(B-V) Error on E(B-V) (lower limit)
111-116 F6.3 Gyr Age Age
118-123 F6.3 Gyr E_Age Error on Age (upper limit)
124-129 F6.3 Gyr e_Age Error on Age (lower limit)
131-153 A23 --- Notes Notes
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Note (1): Models:
B: instantaneous burst star formation model
C: continuous star formation model
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History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 31-May-2001