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Simultaneous Multicolor Detection of Faint Galaxies in the Hubble Deep Field by Szalay, A. S.; Connolly, A. J.; Szokoly, G. P. is a scholarly article available to read on EtoBox.

What is Simultaneous Multicolor Detection of Faint Galaxies in the Hubble Deep Field about?

We present a novel way to detect objects when multiband images are available. Typically, object detection is performed in one of the available bands or on a somewhat arbitrarily co-added image. Our technique provides an almost optimal way to use all the color information available. We build up a composite image of the N passbands where each pixel value corresponds to the probability that the given pixel is just sky. By knowing the probability distribution of sky pixels (a chi-square distribution with N degrees of freedom), the data can be used to derive the distribution of pixels dominated by object flux. From the two distributions an optimal segmentation threshold can be determined. Clipping the probability image at this threshold yields a mask, where pixels unlikely to be sky are tagged. After using a standard connected-pixel criterion, the regions of this mask define the detected objects. Applying this technique to the Hubble Deep Field data, we find that we can extend the detection limit of the data below that possible using linearly co-added images. We also discuss possible ways of enhancing object detection probabilities for certain well defined classes of objects by using va

Author

Szalay, A. S.; Connolly, A. J.; Szokoly, G. P.

Published

1998

Language

EN