J/A+A/570/A53 CTS C30.10 SALT long-slit spectra (Modzelewska+, 2014)
SALT long-slit spectroscopy of CTS C30.10: two-component Mg II line.
Modzelewska J., Czerny B., Hryniewicz K., Bilicki M., Krupa M., Swieton A.,
Pych W., Udalski A., Adhikari T.P., Petrogalli F.
<Astron. Astrophys. 570, A53 (2014)>
=2014A&A...570A..53M 2014A&A...570A..53M
ADC_Keywords: QSOs ; Spectroscopy
Keywords: accretion, accretion disks - techniques: spectroscopic -
line: profiles - individual: CTS C30.10 - dark energy -
galaxies: active
Abstract:
Quasars can be used as a complementary tool to SN Ia to probe the
distribution of dark energy in the Universe by measuring the time
delay of the emission line with respect to the continuum. The
understanding of the MgII emission line structure is important for
cosmological application and for the black hole mass measurements of
intermediate redshift quasars. Knowing the shape of MgII line and its
variability allows for identification which part of the line should be
used to measure the time delay and the black hole mass. We thus aim at
determining the structure and the variability of the MgII line, as
well as the underlying FeII pseudo-continuum. We performed five
spectroscopic observations of a quasar CTS C30.10 (z=0.9000) with
the SALT telescope between December 2012 and March 2014, and we
studied the variations in the spectral shape in the 2700Å-2900Å
rest frame.
We show that the MgII line in this source consists of two kinematic
components, which makes the source representative of type B quasars.
Both components were modeled well with a Lorentzian shape, and they
vary in a similar way. The FeII contribution seems to be related only
to the first (blue) MgII component. Broad band spectral fitting
instead favor the use of the whole line profile. The contribution of
the narrow line region to MgII is very low, below 2%. The MgII
variability is lower than the variability of the continuum, which is
consistent with the simple reprocessing scenario. The variability
level of CTS C30.10 and the measurement accuracy of the line and
continuum is high enough to expect that further monitoring will allow
the time delay between the MgII line and continuum to be measured.
Description:
Five spectra of the quasar CTS C30.10 taken at different dates with
SALT telescope. Spectra are in the rest frame, corrected for the
Galaxy extinction. The five spectra are taken on December 6, 2012,
January 21, 2013, March 20, 2013, August 4, 2013, and March 5, 2014.
Objects:
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RA (2000) DE Designation(s)
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04 47 19.97 -45 37 38.3 CTS C30.10 = QSO B0445-4542
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
spectra.dat 24 2890 Wavelength and flux in arbitrary units
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Byte-by-byte Description of file: spectra.dat
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Bytes Format Units Label Explanations
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4- 12 F9.4 0.1nm lambda [2700/2900] Rest frame wavelength (z=0.9000)
19- 24 F6.4 --- Flux Flux in arbitrary units
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Acknowledgements:
Bozena Czerny, bcz(at)camk.edu.pl
(End) Bozena Czerny [CAMK, Poland], Patricia Vannier [CDS] 27-Aug-2014