The UCM/EGS Group

This work has been carried out with the collaboration of the following people from the UCM Star Formation Group: Pablo G. Pérez-González, Guillermo Barro, Víctor Villar, Jesús Gallego, and Jaime Zamorano.

Covered area

This figure shows the footprints of all the data that the UCM Database have compiled in the EGS region. The background shows the IRAC-3.6 micron image, with all the other datasets overimposed on it in different colors (see below for a list of bands). Red small circles show the positions of the FIDEL sources.

Merged data

The data compiled in the UCM Database include:

1) IRAC images (3.6, 4.5, 5.8, and 8.0 micron).

2) MIPS images (24 micron).

3) HST/WFPC2 (PI-Groth) images in the original Groth Strip (F606W, F814W).

4) HST/WFPC2 (PI-Mould) images near the original Groth Strip (F606W).

5) Subaru R image covering the whole strip.

6) CFHTLS ugriz images covering the central area of the strip.

7) CFHT-12k BRI data covering the whole strip (some artifact problems to be solved).

8) UCM JK images of half of the strip.

9) ACS vi images of half of the strip.

10) NICMOS F110W and F160W of half of the strip.

11) J and K Palomar catalogs.

12) GALEX data of the central part of the strip.

13) DEEP2 DR3 spectroscopy.

Comparison between photo-z and spec-z

Spectral energy distributions have been built for all FIDEL sources (where other data are available) following the same procedure explained in Pérez-González et al. (2007, ApJ, in press)

These SEDs have been used to estimate photometric redshifts by comparing them to templates built with stellar and dust emission models (see Pérez-González et al. 2007). The following figure shows the comparison of spectroscopic and photometric redshifts for the FIDEL sources with available spectroscopy in the DEEP2 DR3. The quality of the photo-z's is very good (i.e., Δ(z)/(1+z)<0.1) for 88% of the sources (only considering the 267 FIDEL sources with spec-z and a quality flag larger or equal to 3), and acceptable (i.e., Δ(z)/(1+z)<0.2) for 97%.

In the figure below, we show the photo-z distribution of the FIDEL sources. 77% of all galaxies with a photo-z (729 galaxies) lie at z<1, and 88% at z<1.5. There are around 30 sources from your original catalog for which I was not able to obtain a photo-z because there were not enough data points in their SEDs.

Accesing photo-z's

You can find all the photo-z's in the following file. The first field in each row shows the FIDEL source ID, the second field shows the best photo-z estimation, and the eightth and nineth fields show the spec-z and corresponding flag. Sources whose names end with a suffix like "_1", "_2", etc... are galaxies where multiple identifications were found within the search radius (2.5"), and a deblending algorithm was called (see Pérez-González et al. 2007)

Please, note that the number of data points in the SEDs vary from source to source due to differences in the availability and depth of ancillary data. This means that the most reliable photo-z's correspond to sources within the IRAC strip, where other UV/optical/NIR/MIR data are also available. The sources outside this area are not as reliable.

We have also produced another alternative photometric catalog where we have measured the photometry in small (around 2" diameter) apertures, and applied an aperture corrections to recover total fluxes. This catalog may be better for very faint, almost point-like sources, as the flux measurements may be less noisy. You can find all the photo-z's obtained with this photometric catalog in the following file, with the same format described above.

Accessing SED plots

If you want to take a look at the SEDs, postage stamps of the source in every band where data are available, the photometric aperture, and some general information for individual sources, you can use this php interface. You will need the username and password: fidel/fidelcigars. Just select the photometric catalog (the main one is FIDEL and the alternative is FIDEL_k04), write the coordinates or the FIDEL name of your source (e.g., fidelegs70_0000286) and hit submit. Note that some sources have a "_#" suffix and you must provide it to access the SED information. Once in the source webpage, you can click on "set cuts" for any image to play with the size and cuts of the postage stamp.