• 제목/요약/키워드: Nebula

검색결과 131건 처리시간 0.019초

THE ANALYSIS OF A STAR CLUSTER FAMILY IN THE NORTHERN PART OF CARINA NEBULA

  • AYU, RAMADHANI PUTRI;PRIYATIKANTO, RHOROM;ARIFYANTO, M. IKBAL;ROMADHONIA, RISKA WAHYU;HILMI, MIFTAHUL;FITRIANA, ITSNA KHOIRUL;WULANDARI, HESTI R.T.
    • 천문학논총
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    • 제30권2호
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    • pp.275-278
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    • 2015
  • We studied a cluster family in the northern part of the Carina Nebula (NGC 3372) a group of clusters near NGC 3324 (Tr 15, NGC 3293, Loden 165, Loden 153 and IC 2581). We used data from UCAC4 to determine the cluster's membership and the near infrared CMDs of each cluster. We analyzed the spatial density and elongation as a function of radius for each cluster and found a possible interaction between NGC 3293 and Loden153. However, the shape distortion of NGC 3324 cannot be evaluated because of the inhomogenity in the coverage of UCAC4 in the east part of NGC 3324.

INVESTIGATING THE PULSAR WIND NEBULA 3C 58 USING EMISSION MODELS

  • Kim, Seungjong;Park, Jaegeun;An, Hongjun
    • 천문학회지
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    • 제52권5호
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    • pp.173-180
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    • 2019
  • We present IR flux density measurements, models of the broadband SED, and results of SED modeling for the Pulsar Wind Nebula (PWN) 3C 58. We find that the Herschel flux density seems to be slightly lower than suggested by interpolation of previous measurements in nearby wavebands, implying that there may be multiple electron populations in 3C 58. We model the SED using a simple stationary one-zone and a more realistic time-evolving multi-zone scenario. The latter includes variations of flow properties in the PWN (injected energy, magnetic field, and bulk speed), radiative energy losses, adiabatic expansion, and diffusion, similar to previous PWN models. From the modeling, we find that a PWN age of 2900-5400 yrs is preferred and that there may be excess emission at ${\sim}10^{11}Hz$. The latter may imply multiple populations of electrons in the PWN.

SED modelling of broadband emission in the pulsar wind nebula 3C 58

  • Kim, Seungjong;An, Hongjun
    • 천문학회보
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    • 제44권2호
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    • pp.55.1-55.1
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    • 2019
  • We investigate broadband emission properties of the pulsar wind nebula (PWN) 3C 58 using a spectral energy distribution (SED) model. We attempt to match simultaneously the broadband SED and spatial variations and emission about 3C 58 in X-ray band. We further the model to explain a possible far-IR feature of which a hint is recently suggested in 3C 58: a small bump at ~10^11 GHz in the PLANCK and Herschel band. While external dust emission may easily explain the observed bump, it may be internal emission of PWNe implying an another additional population of particles. Although significance for the bump in 3C 58 is not higher than other PWNe, here we explore possible origins of the IR bump using the emission model and find that a population of electrons with GeV energies can explain the bump. If it is produced in the PWN, it may provide new insights into particle acceleration and flows in PWNe.

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행성상 성운 NGC 6881의 운동학적 특성과 기하학적 구조 (Kinematics and Geometrical Structure of the Planetary Nebula NGC 6881)

  • 이상민;형식
    • 한국지구과학회지
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    • 제28권7호
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    • pp.847-856
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    • 2007
  • 행성상성운 NGC 6881은 4극자형태를 이루고 있고 JET이 영상에 나타난다. Lick 천문대에 있는 Hamilton Echelle Spectrograph(HES)을 사용하여 관측한 가시광 영역의 방출선 스펙트럼의 선윤곽을 연구하였다. 우리가 연구하는 HES 분광 자료는 직경이 4초각인 영역의 안쪽에서 관측된 것이다. IRAF와 StarLink/Dipso분석프로그램을 사용하여 HI, HeI, HeII, [OIII], [NII], [ArIII], [SII], [SIII] 등의 강한 선들의 선윤곽을 통해 팽창속도를 얻었다. HI선의 경우 단일 정상을 보이는 반면, He과 다른 금지선들은 두 개의 정상 분포가 겹치는 특성을 보였다. 가스 유출 속도는 중심별의 복사압에 의해 바깥쪽으로 갈수록 가속되는 것으로 분석되었다. 우리는 팽창속도자료를 통해, HST 영상에서 보여진 중심부분의 세 개의 고리는 양극콘(HI 선등에 나타남)과 고리(He, [SIII]선에 특성이 보임)의 복합 구조가 투영된 것으로 결론지었다.