• Title/Summary/Keyword: Astronomy

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Intensive Monitoring Survey of Nearby Galaxies: 2017/2018 Status

  • Im, Myungshin;Cho, Changsu;Lim, Gu;Kim, Sophia;Paek, Seunghak Gregory;Kim, Joonho;Hwang, Sungyong;Shin, Suhyung;Baek, Insu;Lee, Sangyun;O, Sung A;Yoon, Sung Chul;Sung, Hyun-Il;Jeon, Yeong-Beaom;Lee, Sang Gak;Kang, Wonseok;Kim, Tae-Woo;Kwon, Sun-gil;Pak, Soojong;Eghamberdiev, Shuhrat
    • The Bulletin of The Korean Astronomical Society
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    • v.43 no.2
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    • pp.59.1-59.1
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    • 2018

  • SNe light curves have been used to understand the expansion history of the universe, and a lot of efforts have gone into understanding the overall shape of the radioactively powered light curve. However, we still have little direct observational evidence for the theorized SN progenitor systems. Recent studies suggest that the light curve of a supernova shortly after its explosion (< 1 day) contains valuable information about its progenitor system and can be used to set a limit on the progenitor size, R*. In order to catch the early light curve of SNe explosion and understand SNe progenitors, we are performing a ~8hr interval monitoring survey of nearby galaxies (d < 50 Mpc) with 1-m class telescopes around the world. Through this survey, we expect to catch the very early precursor emission as faint as R=21 mag (~0.1 Rsun for the progenitor). In this poster, we outline this project, and provide updates on IMSNG projects during 2017/2018 seasons.

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Type-Ia Supernova in M101: Latest Results

  • Im, Myungshin;Choi, Changsu;Jeon, Yiseul;Jun, Hyunsung;Park, Won-Kee;Kim, Ji Hoon;Lee, Jisoo;Pak, Soojong;Baek, Giseon;Kim, Sang-Hyuk;Oh, Youngseok;Jeon, Yeong-Beom;Sung, Hyun-Il;Yoon, Tae Seog;Hong, Jueun;Kim, Dohyeong;Kim, Duho;Jang, Minsung;Hyun, Minhee;Park, Geun-Hong;Yang, Heesu;Jeong, Il-Gyo;Lee, Bang-Won
    • The Bulletin of The Korean Astronomical Society
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    • v.37 no.2
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    • pp.79.2-79.2
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    • 2012

  • SN 2011fe (also known as PTF 11kly) is a Type-1a supernova that appeared in M101, 2011 August. Being only 6.4 Mpc away, this supernova has been intensively observed by various facilities in the world. We monitored this supernova in UBVRI, grizY, and ZYJHK-bands using SNUO, LOAO, SOAO, CQUEAN/McDonald, UKIRT telescopes, and small telescopes in Korea and Mongolia. The monitoring observation is still ongoing, and the light curve has been accumulated over a year. We present the results of the long-term monitoring observation, together with a light-curve fitting result. We will also discuss our findings in terms of the usefulness of Type-Ia supernovae as a distance indicator.

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GALACTIC ANTICENTER CO SURVEY: I. L = $178^{\circ}$ TO $186^{\circ}$, B = $3^{\circ}.5$ TO $6^{\circ}.0$

  • LEE Y.;JUNG J. H.;CHUNG H. S.;PARK Y. S.;KIM H. R.;KIM H. G.;KIM B. G.;KIM J. S.;HAN S. T.
    • Journal of The Korean Astronomical Society
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    • v.29 no.spc1
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    • pp.173-174
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    • 1996

  • We have mapped $17 deg^2$ region toward Galactic anticenter in $^{12}CO$ J = 1 - 0 using the 3 mm SIS receiver on the 14 m telescope at Taeduk Radio Astronomy Observatory (TRAO). The region mapped in this paper is the first target of the Galactic AntiCenter CO Survey Project (GACCOS) and was selected comparing with IRAS Sky Survey Atlas (ISSA) images at 100${\mu}m$. Molecular emission of the target area is found to be very extended and is well matching with the FIR emission boundary. There are several pieces of clouds, and as some of spectra show several peaks, there seem to be several clouds overlapped in some directions. The Velocity of Local Standard of Rest ($V_{LSR}$) of the CO emission of the mapped region ranges from -20 to +10 km/s. It is also found that the two cloudlets located around I = $180^{\circ}$ have $V_{LSR}$ = -20 km/s, which is very abnormal. The peak antenna temperature of 13 K arises near the H II Region S241.

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Infrared Medium-Deep Survey: Overview

  • Im, Myungshin;Pak, Soojong;Park, Won-Kee;Kim, Ji Hoon;Kim, Jae-Woo;Lee, Seong-Kook J.;Karouzos, Marios;Jeon, Yiseul;Choi, Changsu;Jun, Hyunsung;Kim, Dohyeong;Hong, Jueun;Kim, Duho;Hyun, Minhee;Yoon, Yongmin;Taak, Yoon Chan;Kim, Yongjung;Baek, Giseon;Jeong, Hyeonju;Lim, Juhee;Kim, Eunbin;Choi, Nahyun;Lee, Hye-In;Bae, K.M.;Chang, Seunghyuk
    • The Bulletin of The Korean Astronomical Society
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    • v.38 no.2
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    • pp.68.1-68.1
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    • 2013

  • Infrared Medium-Deep Survey is a near-infrared imaging survey geared toward understanding the formation and the evolution of quasars and galaxies at high redshift, and studying transient and time-variable objects such as gamma-ray bursts, supernovae, and young stellar objects. The survey uses a multi-tier structure, with deep imaging survey of 100 $deg^2$ using UKIRT to the depth of 23 AB mag, and a shallower imaging of interesting sources using the CQUEAN camera on the 2.1m telescope at McDonald observatory. This talk will give an overview of the survey strategy, the instrument development, and science highlights. The science highlights will include the discovery of high redshift quasars, high redshift galaxy clusters, GRBs, and other interesting sources. At the end of the talk, we will also present the future prospects of our study.

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