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首页> 外文期刊>The Astrophysical journal >IRAS FSC 15307 + 3252: GRAVITATIONALLY LENSED SEYFERT OR CANNIBAL ELLIPTICAL AT z = 0.93?
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IRAS FSC 15307 + 3252: GRAVITATIONALLY LENSED SEYFERT OR CANNIBAL ELLIPTICAL AT z = 0.93?

机译：IRAS FSC 15307 + 3252：在z = 0.93时重力化的塞弗特或同类椭圆？

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摘要

We present the highest spatial and spectral resolution near-infrared data to date of the～10~(13) h~(-2) solar luminosity IRAS source FSC 15307 + 3252 at z = 0.93, apparently the most luminous galaxy in the known universe. Deep K-band (2.2 μm) images taken in 0.4″ seeing at the W. M. Keck Telescope reveal three components : (A) a bright elliptical source with a compact nucleus, (B) a resolved circular companion separated from component A by 2.0″ (8 h~(-1) kpc for q_0 = 0.5), and (C) a faint irregular component 1.7″ from A. The surface brightness profile of F15307-A is well characterized by a de Vaucouleurs r~(1/4) law with r_e = 1.4″ ± 0.2″ (6 h~(-1) kpc), a size comparable to local giant ellipticals. The nucleus of component A is stellar in appearance with extended structure, possibly a second nucleus ～0.5″ away. Our 1.1-1.4 μm spectrum of the F15307 system with a resolution of 330 km s~(-1) shows strong emission lines of [O I] λλ6300, 6364; blended Hα + [N II] λλ6548, 6583; and [S II] λλ6716, 6731. The ～900 km s~(-1) width of the forbidden lines and the relative strengths of the emission lines are characteristic of Seyfert 2 galaxies. The Hα line also has a broad (1900 km s~(-1)) component. In light of the recent discovery that FSC 10214+4724, previously the most luminous known galaxy, is a gravitationally lensed system, we explore the possibility that F15307 is also lensed. Quantitative arguments are inconclusive, but aspects of F15307's morphology do suggest lensing; the system bears a strong resemblance to quadruple-image gravitational lenses. On the other hand, given the r~(1/4) profile, the close companions, and the active nucleus, F15307 may in fact be a giant elliptical galaxy caught in the act of galactic cannibalism, a scenario that could also account for its unparalleled luminosity.
机译：我们提出了迄今为止〜10〜（13）h〜（-2）太阳光度IRAS源FSC 15307 + 3252在z = 0.93时的最高空间和光谱分辨率近红外数据，这显然是已知宇宙中最发光的星系。在WM Keck望远镜上以0.4“拍摄的深K波段（2.2μm）图像显示了三个成分：（A）具有紧凑核的明亮椭圆形光源，（B）与成分A相隔2.0英寸的解析圆形伴星（ q_0 = 0.5时为8 h〜（-1）kpc，并且（C）来自A的微弱不规则分量1.7“。F15307-A的表面亮度轮廓通过de Vaucouleurs r〜（1/4）定律很好地表征r_e = 1.4“±0.2”（6 h〜（-1）kpc），其大小可与本地巨型椭圆形媲美。组分A的核外观呈恒星状，具有延伸的结构，可能离第二个核约0.5“。我们的F15307系统的1.1-1.4μm光谱，分辨率为330 km s〜（-1），显示出[O I]λλ6300，6364的强发射线;混合的Hα+ [N II]λλ6548，6583; [S II]λλ6716，6731。禁忌线的〜900 km s〜（-1）宽度和发射线的相对强度是塞弗特2星系的特征。 Hα线也具有广阔的（1900 km s〜（-1））分量。鉴于最近发现FSC 10214 + 4724（以前是已知最发光的星系）是重力透镜系统，我们探索F15307也透镜的可能性。数量论据尚无定论，但F15307形态的某些方面确实暗示。该系统与四图像重力透镜非常相似。另一方面，考虑到r〜（1/4）轮廓，紧密的同伴和活跃的核，F15307实际上可能是陷入银河食人族行为的巨大椭圆星系，这种情况也可以解释为无与伦比的发光度。

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