HE0450-2958系统的深近红外成像
Deep near-infrared imaging of the HE0450-2958 system
摘要：
类星体HE 0450 -2958和它的伴星系都在红外线波段超亮，近年来一直受到广泛关注，因为类星体的宿主星系仍然没有被发现。这导致了对类星体和星系形成及共同演化的各种解释，如黑洞抛射、喷流诱导恒星形成、尘埃遮蔽星系、低于探测极限的正常宿主等。我们在近红外进行了深入的观测，以解决关于任何主机存在的难题。用ESO VLT和HAWK-I在近红外J波段对该物体进行了8小时的观测。这些图像已经用MCS反卷积方法处理过（Magain，Courbin和Sohy，1998年），可以从观测中准确地减去类星体光。位于类星体附近的紧凑发射区，称为斑点，以前只显示气体发射线的光谱，现在在我们的近红外图像检测。它的高亮度意味着恒星可能有助于近红外辐射。因此，这个斑点可能被解释为一个偏离中心的、明亮的、非常紧凑的宿主星系，与它的同伴发生了剧烈的碰撞。
英文摘要：
The QSO HE0450-2958 and the companion galaxy with which it is interacting, both ultra luminous in the infrared, have been the subject of much attention in recent years, as the quasar host galaxy remained undetected. This led to various interpretations on QSO and galaxy formation and co-evolution, such as black hole ejection, jet induced star formation, dust obscured galaxy, or normal host below the detection limit. We carried out deep observations in the near-IR in order to solve the puzzle concerning the existence of any host. The object was observed with the ESO VLT and HAWK-I in the near-IR J-band for 8 hours. The images have been processed with the MCS deconvolution method (Magain, Courbin & Sohy, 1998), permitting accurate subtraction of the QSO light from the observations. The compact emission region situated close to the QSO, called the blob, which previously showed only gas emission lines in the optical spectra, is now detected in our near-IR images. Its high brightness implies that stars likely contribute to the near-IR emission. The blob might thus be interpreted as an off-centre, bright and very compact host galaxy, involved in a violent collision with its companion.
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