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首页> 外文期刊>The Astrophysical journal >NEAR-INFRARED OBSERVATIONS OF EXTENDED EMISSION AROUND PG 1545+210
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NEAR-INFRARED OBSERVATIONS OF EXTENDED EMISSION AROUND PG 1545+210

机译：PG 1545 + 210周围扩展发射的近红外观测

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摘要

Infrared images at H and Ks of the quasar PG 1545+210 clearly show both extended emission centered on the quasar and a companion galaxy. The magnitudes of the extended emission deduced from these observations depend strongly on the model adopted for the emission. Both an exponential disk model and a de Vaucouleurs model provide adequate fits to the extended emission. If it is assumed to follow an exponential disk galaxy, these measurements imply that the host galaxy has absolute magnitudes comparable with those of a Schechter L~* galaxy. With this assumption for the intrinsic light distribution, the H magnitude and the Hubble Space Telescope limit on the V magnitude are inconsistent with color predictions for unreddened spiral galaxies at the redshift of the quasar. If the data are fitted to a de Vaucouleurs model, the extended emission dominates the total energy of the system and significantly exceeds that of an L~* galaxy. The companion galaxy has colors consistent with its being at the redshift of the quasar, but its luminosity is at most a small part of that of the entire system. If the companion is at the redshift of PG 1545+210, its absolute magnitude is M_H ～ —22 mag, significantly fainter than that of an L~* galaxy.
机译：准星PG 1545 + 210的H和Ks处的红外图像清楚地显示了以准星为中心的扩展发射以及伴随星系。从这些观察结果推导出的扩展排放量的大小在很大程度上取决于所采用的排放模型。指数盘模型和de Vaucouleurs模型都为扩展的排放提供了足够的拟合。如果假定遵循指数盘状星系，则这些测量结果表明宿主星系的绝对大小可与Schechter L〜*星系的绝对大小相比。在本征光分布的这种假设下，H幅值和哈勃太空望远镜对V幅值的限制与类星体红移时未变红的旋涡星系的颜色预测不一致。如果将数据拟合到de Vaucouleurs模型，则扩展的发射将主导系统的总能量，并且大大超过L〜*星系的能量。伴随星系的颜色与其在类星体的红移时的颜色一致，但是其发光度最多只是整个系统的一小部分。如果伴星处于PG 1545 + 210的红移状态，则其绝对大小为M_H〜-22 mag，比L〜*星系大得多。

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