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RISS 인기검색어
- 검색키워드
- 저자 : P. Ferruit (검색결과 2 건)
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The kinematics of the Seyfert 2 galaxy NGC 5728 circumnuclear region
Son, D.-H.,Hyung, S.,Ferruit, P.,Pé,contal, E.,Lee, W.-B. Blackwell Publishing Ltd 2009 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.395 No.2
<P>ABSTRACT</P><P>We secured spectral images of the circumnuclear, 12 × 10 arcsec<SUP>2</SUP> region of the Seyfert 2 galaxy NGC 5728 with the Optically Adaptive System for Imaging Spectroscopy at the Canada–France–Hawaii Telescope 3.6-m telescope. The radial velocity distribution of the two bright zones, main central (C) core and north-west (NW) core, and strategically important points along the position angles, PA 33°, 90°, 123° and 143°, are analysed. The large-scale reconstructed monochromatic images of the Hα, Hβ, [O <SMALL>III</SMALL>] and [N <SMALL>II</SMALL>] lines show a bipolar morphology along PA ∼ 123°. The prominent elliptical ring is seen in the Hα and Hβ monochromatic images. Our analysis implies that this ring is rotating in the same clockwise direction as that of the galactic disc; this elliptical ring is in fact a projected result of a circular ring of radius ∼5.4 arcsec, with <I>i</I>∼ 50° (nearly aligned with the host galactic plane).</P><P>We used the [O <SMALL>III</SMALL>]5007 line profiles for a detailed analysis of kinematics in the circumnuclear region of the NGC 5728. The [O <SMALL>III</SMALL>]5007 line profiles reveal distinct kinematical structures. (1) The strongest component of Doppler peaks: two core components, consisting of the receding main C-core and the approaching NW-core with the radial velocities, <I>V</I><SUB>r</SUB>≃+250 and −240 (or −250) km s<SUP>−1</SUP>, respectively. These two cores consist of a roughly spherically symmetric distribution of the gas with radii of <I>r</I>∼ 1.0 arcsec (at <I>V</I><SUB>r</SUB>≃+240 km s<SUP>−1</SUP>) and 0.9 arcsec (at <I>V</I><SUB>r</SUB>≃−240 km s<SUP>−1</SUP>), respectively. Hints of the presence of inflows around these cores are observed. (2) The next strong line profile component: this component corresponds to the bipolar cone aligned PA ∼ 123°. (3) The reverse S-shaped kinematical boundary which runs through the double-peaked zone of 6–7 arcsec long in the galactic major axis direction is likely to be caused by a combination of the disc rotation of the host galaxy and the revolution of the two central cores.</P>
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형식,손동훈,P. Ferruit,이우백 한국지구과학회 2006 한국지구과학회지 Vol.27 No.5
The distribution and kinematic information of the continuum, Hα, Hβ, [O III], & [N II] images based onspectroscopic data secured with the OASIS at the Hawaii CFHT 3.6m telescope have been analyzed to study the physicalcharacteristics of NGC 5728. The three bright regions-northwestern knot, southeastern knot, and the nucleus-exist within a15"× 12" sky area which seem to indicate gas flows along the northwestern or western direction from the nucleus. Wefind that the center of a 10" diameter ring is at the northwestern knot, not at the galactic center. To further analyze theformation mechanism of such a ring, the kinematics of the nucleus and knot have been studied and the central structureof the Active Galactic Nuclei has been investigated by comparing various emission images.Seyfert Galaxy, Active Galactic Nuclei, spectroscopic observation, NGC 5728. . : CFHT ... 3.6 m .... ... OASIS .... .... .. ..... continuum, Hα, Hβ, [O III],[N II] .. ... ... .. ... NGC 5728. ... ... ..... . NGC 5728. .... NLR .... .... . 15"× 12" .. ... 3.. .. .. (NW knot, SE knot, nucleus). .... .. , .. .(nucleus). .... ...... .... ... ... .... ... ..... ... .. 10". ring. ..... .. NW knot. ... ..... .... ... ..... . ... ... ... .. ... .. .... ... .. knot. .... ... .... ... , ... .... ... .... ...... .. .
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