FOCAL REDUCER FOR CQUEAN (Camera for QUasars in EArly uNiverse)

Lim, Juhee; Chang, Seunghyuk; Pak, Soojong; Kim, Young‐Ju; Park, Won-Kee; Im, Myungshin

doi:10.5303/jkas.2013.46.4.161

Cited by 13 publications

(14 citation statements)

References 14 publications

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“…The LOAO data were obtained in R band filter from 2013 March 26 to April 2. The afterglow was also observed with Camera for Quasars in Early Universe (Camera for QUasars in the EArly uNiverse; Park et al 2012;Kim et al 2011;Lim et al 2013) on the 2.1-m Otto-Struve telescope of the McDonald observatory, Texas, USA. The data were obtained in g, r, i, z, and Y filters, starting at 2013 March 26, 10:09:22 (UT), and continued till April 2.…”

Section: Observationsmentioning

confidence: 82%

Synchrotron Self-Inverse Compton Radiation From Reverse Shock on GRB 120326a

Urata

Huang

Takahashi

et al. 2014

ApJ

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We present multi-wavelength observations of a typical long duration GRB 120326A at z = 1.798, including rapid observations using a submillimeter array (SMA), and a comprehensive monitoring in X-ray and optical. The SMA observation provided the fastest detection to date among seven submillimeter afterglows at 230 GHz. The prompt spectral analysis, using Swift and Suzaku yielded a spectral peak energy of E src peak = 107.8 +15.3 −15.3 keV and equivalent isotropic energy of E iso as 3.18 +0.40 −0.32 × 10 52 erg. The temporal evolution and spectral properties in the optical were consistent with the standard forward shock synchrotron with jet collimation (6 • .69 ± 0 • .16). The forward shock modeling using a 2D relativistic hydrodynamic jet simulation also determined the reasonable burst explosion

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Section: Observationsmentioning

confidence: 82%

Synchrotron Self-Inverse Compton Radiation From Reverse Shock on GRB 120326a

Urata

Huang

Takahashi

et al. 2014

ApJ

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“…We observed 10 AGNs using SNUCAM (Im et al2010; FOV= 18 ′ .1 × 18 ′ .1 and pixel scale= 0. ′′ 266) on the 1.5m telescope at the Maidanak observatory in Uzbekistan from 2010 June to 2011 August, six AGNs using the Camera for QUasars in EArly uNiverse (CQUEAN; Park et al 2012;Kim et al 2011;Lim et al 2013 1 gives the summary of the filter, the exposure time, the surface-brightness limit, and the observatory used for the observation of each target. The seeing ranges from 0.…”

Section: Observation and Data Reductionmentioning

confidence: 99%

Correlation Between Galaxy Mergers and Luminous Active Galactic Nuclei

Hong

Kim

et al. 2015

ApJ

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It is not yet clear what triggers the activity of active galactic nuclei (AGNs), but galaxy merging has been suspected to be one of the main mechanisms fuelling the activity. Using deep optical images taken at various ground-based telescopes, we investigate the fraction of galaxy mergers in 39 luminous AGNs (M R -22.6 mag) at z ≤ 0.3 (a median redshift of 0.155), of which the host galaxies are generally considered as early-type galaxies. Through visual inspection of the images, we find that 17 of 39 AGN host galaxies (43.6%) show the evidence for current or past mergers like tidal tails, shells, and disturbed morphology. In order to see if this fraction is abnormally high, we also examined the merging fraction of normal early-type galaxies in the Sloan Digital Sky Survey (SDSS) Strip 82 data (a median redshift of 0.04), of which the surface-brightness limit is comparable to our imaging data. To correct for the effects related to the redshift difference of the two samples, we performed an image simulation by putting a bright point source as an artificial AGN in the images of SDSS early-type galaxies and placing them onto the redshifts of AGNs. The merging fraction in this realistic sample of simulated AGNs is only ∼ 5 − 15% (1/4 to 1/8 of that of real AGNs). Our result strongly suggests that luminous AGN activity is associated with galaxy merging.

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“…We also observed Swift J1644+57 using Camera for QUasars in EArly uNiverse (CQUEAN; Kim et al 2011;Park et al 2012;Lim et al 2013) on the 2.1m Otto-Struve telescope of the McDonald Observatory in g, r, i, z, and Y bands. The numbers of epochs for the g, r, i, z, and Y band data are 2, 2, 14, 14, and 2 and the last data were observed at ∆t = 25.7, 217.5, 526.6, 526.6, and 25.8 days respectively.…”

Section: Observations and Datamentioning

confidence: 99%

HOST GALAXY PROPERTIES AND BLACK HOLE MASS OF SWIFT J164449.3+573451 FROM MULTI-WAVELENGTH LONG-TERM MONITORING ANDHSTDATA

Yoon

Jeon

et al. 2015

ApJ

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We study the host galaxy properties of the tidal disruption object, Swift J164449.3+573451 using long-term optical to near-infrared (NIR) data. First, we decompose the galaxy surface brightness distribution and analyze the morphology of the host galaxy using high resolution HST WFC3 images. We conclude that the host galaxy is a bulge-dominant galaxy that is well described by a single Sérsic model with Sérsic index n = 3.43 ± 0.05. Adding a disk component, the bulge to total host galaxy flux ratio (B/T) is 0.83 ± 0.03, which still indicates a bulge-dominant galaxy. Second, we estimate multi-band fluxes of the host galaxy through long-term light curves. Our long-term NIR light curves reveal the pure host galaxy fluxes ∼ 500 days after the burst. We fit spectral energy distribution (SED) models to the multi-band fluxes from the optical to NIR of the host galaxy and determine its properties. The stellar mass, the star formation rate, and the age of stellar population are log(M ⋆ /M ⊙ ) = 9.14 +0.13 −0.10 , 0.03 +0.28 −0.03 M ⊙ /yr, and 0.63 +0.95 −0.43 Gyr. Finally, we estimate the mass of the central super massive black hole which is responsible for the tidal disruption event. The black hole mass is estimated to be 10 6.7±0.4 M ⊙ from M BH -M ⋆,bul and M BH -L bul relations for the K band, although a smaller value of ∼ 10 5 M ⊙ cannot be excluded convincingly if the host galaxy harbors a pseudobulge.

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FOCAL REDUCER FOR CQUEAN (Camera for QUasars in EArly uNiverse)

Cited by 13 publications

References 14 publications

Synchrotron Self-Inverse Compton Radiation From Reverse Shock on GRB 120326a

Synchrotron Self-Inverse Compton Radiation From Reverse Shock on GRB 120326a

Correlation Between Galaxy Mergers and Luminous Active Galactic Nuclei

HOST GALAXY PROPERTIES AND BLACK HOLE MASS OF SWIFT J164449.3+573451 FROM MULTI-WAVELENGTH LONG-TERM MONITORING ANDHSTDATA

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