J/A+A/566/A36 Subaru H images of UM673 (Koptelova+, 2014)
New near-infrared observations and lens-model constraints for UM673.
Koptelova E., Chiueh T., Chen W.P., Chan H.-H.
<Astron. Astrophys. 566, A36 (2014)>
=2014A&A...566A..36K 2014A&A...566A..36K
ADC_Keywords: QSOs ; Gravitational lensing ; Photometry
Keywords: gravitational lensing: strong - methods: data analysis -
quasars: individual: UM673
Abstract:
We performed a detailed photometric analysis of the lensed system
UM673 (Q0142-100) and an analysis of the tentative lens models.
High-resolution adaptive optics images of UM673 taken with the Subaru
telescope in the H band were examined. We also analysed the J, H and
K-band observational data of UM673 obtained with the 1.3m telescope at
the CTIO observatory.
We present photometry of quasar components A and B of UM673, the lens,
and the nearby bright galaxy using H-band observational data obtained
with the Subaru telescope. Based on the CTIO observations of UM673, we
also present J- and H-band photometry and estimates of the J, H and
K-band flux ratios between the two UM673 components in recent epochs.
The near-infrared fluxes of the A and B components of UM673 and their
published optical fluxes are analysed to measure extinction properties
of the lensing galaxy. We estimate the extinction-corrected flux ratio
between components A and B to be about 2.14 mag. We discuss lens
models for the UM673 system constrained with the positions of the
UM673 components, their flux ratio, and the previously measured time
delay.
Description:
We carried out H-band observations of UM673 with the Subaru Infra-Red
Camera and Spectrograph (IRCS) using an adaptive optics system with
188 control elements (AO188). The images were reduced following the
procedure described in "Subaru Data Reduction CookBook: Imaging
Observation with IRCS" by Y. Minowa (see also Minowa et al.
2005ApJ...629...29M 2005ApJ...629...29M). The final Subaru H-band stack image of UM673 was
created by coadding 22 reduced single exposure images. We also created
the exposure time map of the stack image. The 17x10arcsec subframe
of the stack image and the corresponding exposure map displayed in
Figures 1 and 2 of the paper are available as fits files.
Objects:
-----------------------------------------------
RA (2000) DE Designation(s)
-----------------------------------------------
01 45 16.5 -09 45 17 UM673 = QSO B0142-100
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 117 2 List of maps of UM673
fits/* . 2 Individual maps
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See also:
J/A+A/544/A51 : R-band photometry of the lensed quasar UM673 (Koptelova+, 2012)
Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 25 F6.4 arcsec/pix scale [0.0204] Scale of the image
27- 29 I3 --- Nx [851] Number of pixels along X-axis
30 A1 --- --- [x]
31- 33 I3 --- Ny [501] Number of pixels along Y-axis
35- 38 I4 Kibyte size [1702] Size of FITS file
40- 55 A16 --- FileName Name of FITS file in subdirectory fits
57-117 A61 --- Title Title of the file
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Acknowledgements:
Ekaterina Koptelova, ekaterina(at)phys.ntu.edu.tw,
koptelova(at)xray.sai.msu.ru
References:
Koptelova et al., 2010MNRAS.401.2805K 2010MNRAS.401.2805K
Koptelova et al., 2008ARep...52..270K 2008ARep...52..270K
(End) Patricia Vannier [CDS] 04-May-2014