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1968년 ~ 2024년까지 1,211 건의 한국천문학회지를 격월간 확인하실 수 있습니다.
- The Korean Astronomical Society (The Korean Astronomical Society)
- 계간 (Quarterly)
- ISSN : 1225-4614 (ISSN : 1225-4614)
1225-4614
- DB구축현황 : 1,211건 (DB Construction : 1,211 Articles)
총 게시글 1,211건
페이지 81/122
801
- LA DAIL
- Journal of the Korean astronomical society = 천문학회지
- 29, n.2
- pp.83-91
- 1996
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We present a model that rotating primordial blackholes(PBHs) produced at the end of inflation generate the random, non-oriented primordial magnetic field. PBHs are copiously produced as the Universe completes the cosmic phase transition via bubble nucleation and tunneling processes in the extended inflation hypothesis. The PBHs produced acquire angular momentum through the mutual tidal gravitational interaction. For PBHs of mass less than 1013g, one can show that the evaporation (photon) luminosity of PBHs exceeds the Eddington limit. Thus throughout the lifetime of the rotating PBH, radiation flow from the central blackhole along the Kerr-geodesic exerts torque to ambient plasma. In the process similar to the Bierman's battery mechanism electron current reaching up to the horizon scale is induced. For PBHs of Grand Unified Theories extended inflation with the symmetry breaking temperature of <TEX>$T_{GUT}\;\~\;10^{10}$</TEX> GeV, which evaporate near decoupling, we find that they generate random, non-oriented magnetic fields of <TEX>$\~10^{-11}G$</TEX> on the last-scattering surface on (the present comoving) scales of <TEX>$\~O(10)Mpc$</TEX>.
802
- HUANG KELIANG
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.105-106
- 1996
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In this paper, we present observations of absorption line spectrum of QSO 1225+317 with resolution of 18 km <TEX>$sec^{-1}$</TEX>. Four possible new heavy element line systems are identified. The properties of Lyman <TEX>$\alpha$</TEX> forest lines are discussed.
803
- LEE YOUNGUNG
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.187-188
- 1996
- 원문 바로보기
We have mapped <TEX>$1 deg^2$</TEX> region toward a high latitude HII region S73 (l, b) = (<TEX>$37^{\circ}.69$</TEX>, <TEX>$44^{\circ}.55$</TEX>) and associated molecular cloud in <TEX>$^{12}CO$</TEX> J = 1 - 0, and <TEX>$^{13}CO$</TEX> J = 1 - 0, using the 3 mm SIS receiver on the 14 m telescope at Taeduk Radio Astronomy Observatory. A high resolution autocorrelator is used to resolve extremely narrow CO linewidths (FWHP < 1 km/s) of the molecular cloud. Though the linewidths are very narrow, it is found that there is systematic velocity gradient in the molecular gas associated with the H II region. Both of <TEX>$^{12}CO$</TEX> and <TEX>$^{13}CO$</TEX> averaged spectra are non-gaussian, and there are obvious blue wings in the spectra. It is remarkable that the linewidths at the blueshifted region are broader than those of the rest of the cloud. The CO emission does match well with the dust emission.
804
- PANDEY A. K.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.179-180
- 1996
- 원문 바로보기
The aim of the paper is to analyse the extinction law in the giant H II region NGC 3603. The ratio R is found to be greater than 5.0. In front of the cluster the reddening law is found to be normal. We have obtained a distance of <TEX>$\~$</TEX>5.3 Kpc which is significantly smaller than those adopted so far.
805
- BABADZHANOV P. B.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.359-361
- 1996
- 원문 바로보기
806
- TOHMURA ICHIROH
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.321-322
- 1996
- 원문 바로보기
Using the data on the occurrences of the Ho: and soft X-ray flares for the time interval of January 1, 1986-May :31, 1994, we have studied the middle term(30-300days) pericities of the solar flare production during the activity cycle 22. Power analysis of the time seies of daily H<TEX>$\alpha$</TEX> flare index in the northern hemisphere shows prominent periodicities at 220, 120, 109, and 92 days(see Figures l(a) and l(b)), while in the southern hemisphere, those at 267, 213, 183, 167, and 107 days are apparent, though their peaks are not so distint as those in the northern hemisphere. Periodogram of daily soft X-ray flare index also reveal the periodicities at 279, 205, 164, 117, and 91 days in the northern hemisphere, and at 266, 220, 199, 162, 120, and 100 days in the southern hemisphere. Howeer, the 155-day periodicity reported for the earlier cycles, 19, 20, and 21, could not be confirmed in our analysis. to be submitted to Solar Physics; an extended abstract.
807
- LEE HYUNG MOK
- Journal of the Korean astronomical society = 천문학회지
- 29, n.2
- pp.195-205
- 1996
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The evolution of the stellar debris after tidal disruption due to the super massive black hole's tidal force is difficult to solve numerically because of the large dynamical range of the problem. We developed an SPH (Smoothed Particle Hydrodynamics) - TVD (Total Variation Diminishing) hybrid code in which the SPH is used to cover a widely spread debris and the TVD is used to compute the stream collision more accurately. While the code in the present form is not sufficient to obtain desired resoultion, it could provide a useful tool in studying the aftermath of the stellar disruption by a massive black hole.
808
- HU HUI
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.255-256
- 1996
- 원문 바로보기
809
- FATEMI S. J.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.57-58
- 1996
- 원문 바로보기
There is an excess gamma flux from the general direction of the Galactic North Pole compared with that from the south when allowance is made for the contribution from CR interactions with the HI gas (Osborne et al., 1994). The extent to which it is in accord with the predictions of Wdowczyk and Wolfendale (1990 a,b) for gamma rays secondary to very high energy CR escaping from the VIRGO cluster is examined and it is claimed that the observations may well be of the order of those expected.
810
- LEE H. W.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.249-250
- 1996
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