arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1208.3248astro-ph.GAastro-ph.CO
收藏

Markarian 266中双活动核、外流、冲击加热气体和年轻星团的研究

Investigation of Dual Active Nuclei, Outflows, Shock-Heated Gas, and Young Star Clusters in Markarian 266

J. M. Mazzarella, K. Iwasawa, T. Vavilkin, L. Armus, D. -C. Kim, G. Bothun, A. S. Evans, H. W. W. Spoon, S. Haan, J. H. Howell, S. Lord, J. A. Marshall, C. M. I… 展开作者

J. M. Mazzarella, K. Iwasawa, T. Vavilkin, L. Armus, D. -C. Kim, G. Bothun, A. S. Evans, H. W. W. Spoon, S. Haan, J. H. Howell, S. Lord, J. A. Marshall, C. M. Ishida, C. K. Xu, A. Petric, D. B. Sanders, J. A. Surace, P. Appleton, B. H. P. Chan, D. T. Frayer, H. Inami, E. Ye. Khachikian, B. F. Madore, G. C. Privon, E. Sturm, Vivian U, S. Veilleux

摘要:

用斯皮策、哈勃、GALEX、钱德拉和XMM-牛顿空间望远镜观测了明亮红外星系(LIRG)合并Mrk 266的结果。SW(Seyfert 2)和NE(LINER)核分别位于哈勃类型SBb(pec)和S 0/a(pec)的星系中。这两个星系都有L > L*,并且它们被推断每个都包含一个~ 2.5 × 10^8 M_sun的黑洞。Mrk 266 SW可能是从该系统中检测到的明亮Fe K-α线的主要来源,这与严重模糊的活动星系核的反射主导X射线光谱一致。嵌入在弧中的光学结具有排列的射电连续辐射,结合发光的H_2线发射,提供了在围绕NE核的活动星系核驱动的外流中存在辐射弓形激波的证据。软X射线辐射模拟为冲击加热等离子体与星系之间的射电连续辐射是同空间的。中红外诊断表明活动星系核和星爆辐射对辐射热光度的贡献大致相等。大约有120个星团被探测到,其中大多数的估计年龄小于5000万年。在星系北部探测到的24微米辐射延伸到约34弧秒(20千秒差距),被解释为约2 × 10^7太阳质量的尘埃被夹带在外流的超级风中;在可见光波长下,这一区域被分解为碎片形态,表明电离气体壳层膨胀中的瑞利-泰勒不稳定性。Mrk 266表明,尘埃“吹出”阶段可以开始在LIRG以及之前的星系完全合并在随后的ULIRG阶段,和快速的气体消耗在发光的双活动星系核(千秒差距尺度的分离)合并过程中的早期可能会解释检测到的二元类星体(亚pc尺度轨道)在大型调查的缺乏。提出了一个演化序列,代表了从对偶活动星系核到二元活动星系核的发展,伴随着观测到的L_x/L_ir比值增加了10^4或更多。

英文摘要:

Results of observations with the Spitzer, Hubble, GALEX, Chandra, and XMM-Newton space telescopes are presented for the Luminous Infrared Galaxy (LIRG) merger Mrk 266. The SW (Seyfert 2) and NE (LINER) nuclei reside in galaxies with Hubble types SBb (pec) and S0/a (pec), respectively. Both galaxies have L > L*, and they are inferred to each contain a ~2.5x10^8 M_sun black hole. Mrk 266 SW is likely the primary source of a bright Fe K-alpha line detected from the system, consistent with the reflection-dominated X-ray spectrum of a heavily obscured AGN. Optical knots embedded in an arc with aligned radio continuum radiation, combined with luminous H_2 line emission, provide evidence for a radiative bow shock in an AGN-driven outflow surrounding the NE nucleus. Soft X-ray emission modeled as shock-heated plasma is co-spatial with radio continuum emission between the galaxies. Mid-IR diagnostics indicate roughly equal contributions of AGN and starburst radiation powering the bolometric luminosity. Approximately 120 star clusters have been detected, with most having estimated ages < 50 Myr. Detection of 24 micron emission extending ~34 arcsec (20 kpc) north of the galaxies is interpreted as ~2x10^7 M_sun of dust entrained in an outflowing superwind; at optical wavelengths this region is resolved into a fragmented morphology indicative of Rayleigh-Taylor instabilities in an expanding shell of ionized gas. Mrk 266 demonstrates that the dust "blow-out" phase can begin in a LIRG well before the galaxies fully coalesce during a subsequent ULIRG phase, and rapid gas consumption in luminous dual AGNs (kpc scale separations) early in the merger process may explain the paucity of detected binary QSOs (sub-pc scale orbits) in large surveys. An evolutionary sequence is proposed representing a progression from dual to binary AGNs, accompanied by an increase in observed L_x/L_ir ratios by 10^4 or more.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑