Mission Overview
The MUSE Ultra Deep Field (MUDF)
Primary Investigators: Marc Rafelski, Michele Fumagalli
HLSP Authors: Mitchell Revalski, Marc Rafelski, Norbert Pirzkal
Released: 2023-02-08
Updated: 2023-02-08
Primary Reference(s): Revalski et al. 2023
DOI: 10.17909/81fp-2g44
Citations: See ADS Statistics
Source Data:
The region of the sky (3.'6 x 3.'6) containing the MUSE Ultra Deep Field, with instrument and filter coverage overlaid. The full field is covered by HST WFC3 F140W direct imaging, with a wide-shallow region (dashed red) and a narrow-deep region (solid red), with the data shown using a linear flux scaling. Additional HST WFC3 observations with the F125W (orange) and F336W (purple) filters are indicated by solid regions, as well as co-spatial archival WFPC2 observations with the F702W (dashed green) and F450W (dashed blue) filters. The depth of the MUSE observations are indicated by magenta contours that start at 90 hours and decrease by powers of three, with the center-most regions reaching a full depth of 120 hours. The locations of the two z~3.22 quasars are indicated by gold stars, which are found within the 30 hour MUSE contour (solid magenta).
The same field of view as Figure 1, showing sources with spectroscopic coverage in WFC3 (1,499 sources) and MUSE (991 sources). The maximum spatial extent of the WFC3 and MUSE spectral regions are shown by the thick orange and magenta regions, respectively. Objects with spectra are shown with apertures equal to six times their Kron radii, and are colored in the following order: sources in orange have only a WFC3 spectrum (550 sources), magenta have only a MUSE spectrum (42 sources), blue have both WFC3 and MUSE spectra (949 sources), and red have a spectroscopic redshift (419 sources). The WFC3 grism disperses the field such that some sources with spectra are located just outside the direct imaging FOV, as seen by sources near the top of the figure, and bright objects without redshifts are primarily foreground stars in our Galaxy. These data provide spectroscopic coverage in at least one instrument for 1,541 sources, yielding 419 confirmed spectroscopic redshifts.
Overview
The MUSE Ultra Deep Field (MUDF) program is a multi-wavelength imaging and spectroscopic survey targeting a unique extragalactic field with two quasars at z = 3.2 that are separated by only 500 kpc. By combining emission line studies with high resolution spectroscopy of the two quasars, the project is designed to connect the physical properties of galaxies observed in emission with their surrounding gas viewed in absorption along the sightlines to the background quasars. These multiple sightlines provide a stereoscopic view that yields constraints on the size and geometry of the absorbing gas in the interstellar and circumgalactic medium over 10 billion years of cosmic time.
The team provides Hubble Space Telescope (HST) data products for this field, anchored by 90 orbits of Wide Field Camera 3 (WFC3) near-infrared imaging and grism spectroscopy (HST Program 15637) that represents the deepest HST grism survey ever conducted for a single field. The release contains custom-calibrated science data that includes WFC3 F140W, F125W, and F336W imaging, WFC3 G141 grism spectroscopy, and reprocessed Wide Field and Planetary Camera 2 (WFPC2) F702W and F450W imaging. The team supplies source catalogs with photometric and morphological measurements for 3,375 unique sources, including 1,536 objects with both imaging and spectroscopic coverage. The team provides robust spectroscopic redshifts for 419 sources between z = 0 – 6, which will enable a variety of studies focusing on galaxy formation and evolution in different environments.
These High Level Science Products contain science images with plate scales of 0.06 arcsec pixel-1 that are aligned with north up to the GAIA Early Data Release 3 (EDR3) astrometric coordinate system. The provided Point Spread Function (PSF) models have identical plate scales and have their integrated flux normalized to unity, which corresponds to the zero-point magnitude in each filter. The catalogs are provided in ASCII format, along with a quick view PDF that contains a summary figure of the imaging, photometry, and spectroscopy for each object with HST spectral coverage.
Data Products
Images and Models
Image and model files have the following naming convention:
hlsp_mudf_hst_<ins>_mudf_<filter>_v1_<datatype>.fits
where:
- <ins> = Instrument used, either "wfc3" or "wfpc2".
- <filter> = Filter used, either "f125w", "f140w", "f336w", "f450w" or "f702w".
- <datatype> = Product extension, see table below for possible values.
Image file types:
| _drz-sci.fits |
Science drizzle images with pixel scales of 0.06 arcseconds per pixel and in units of counts per second. |
| _drz-wht.fits |
Drizzle weight maps that were produced using the inverse variance map (IVM) option in AstroDrizzle. |
| _drz-rms.fits |
Drizzle error maps (1/\(\sqrt{\mathrm{IVM}}\)) that have been corrected for correlated pixel noise. |
| _drz-neg.fits |
Science drizzle images multiplied by -1.0 so they may be used to determine source detection thresholds. |
| _psf-mod.fits |
Area-normalized PSF models that are 69 x 69 pixels in size with scales of 0.06 arcseconds per pixel. |
| _con-ker.fits |
Area-normalized convolution kernels used to PSF-match each filter to the F140W mosaic resolution. |
| _drz-con.fits |
Science drizzle images convolved to the spatial resolution of the F140W mosaic and used for photometry. |
| _seg-map.fits |
Merged deep+shallow segmentation map with IDs matching those in the merged photometric catalog. |
Catalogs
Catalog files are named according to the following convention:
hlsp_mudf_hst_<ins>_mudf_<filter>_v1_<catalogtype>.fits
where:
- <ins> = Instrument used, either "wfc3" or "wfpc2".
- <filter> = Filter used, either "f125w", "f140w", "f336w", "f450" or "f702w".
- <catalogtype> = Product extension, see table below for possible values.
Catalog file types:
| _morphology-catalog.txt |
Statmorph catalog table for each filter. |
| _source-catalog.txt |
Multi-filter Source Extractor catalog. |
Spectra
1D spectra files are named according to the following convention:
hlsp_mudf_hst_wfc3_obj-<object>_g141_v1_1d-spec.fits
where:
- <object> = Zero-padded five-digit object number.
2D spectra files are named according to the following convention:
hlsp_mudf_hst_wfc3_obj-<object>-pa-neg<ang>_g141_v1_2d-spec.fits
where:
- <object> = Zero-padded five-digit object number.
- <ang> = Position angle in degrees. The "neg" prefix indicates that the angle is negative.
Graphics
Summary graphics that display the direct imaging, photometry, and HST grism spectra for each object are named according to the following convention:
hlsp_mudf_hst_wfc3-wfpc2_mudf-<object>_multi_v1_summary.pdf
where:
- <object> = Zero-padded five-digit object number. In the case of "_summary.pdf", this is a combined summary PDF for all objects.
Statmorph graphics summarizing the morphologies, including the orientation, elongation, and CAS statistics for each object, are named according to the following convention:
hlsp_mudf_hst_wfc3_mudf-<object>_<filter>_v1_statmorph.pdf
where:
- <filter> = Filter used, either "f125w", "f140w", "f336w", "f450" or "f702w".
Data Access
Imaging, model, and catalog files can be downloaded directly from the table below. The multi-filter Source Extractor catalog ("Source Catalog") is linked at the bottom of the table.
| Filter | Inst. | Image Files | Model Files | Catalog Files |
|---|---|---|---|---|
| F125W | WFC3 | drz-sci | drz-wht | drz-rms | drz-neg | drz-con | psf-mod | con-ker | morphology-catalog |
| F140W | WFC3 | drz-sci | drz-wht | drz-rms | drz-neg | seg-map | ||
| F336W | WFC3 | drz-sci | drz-wht | drz-rms | drz-neg | drz-con | ||
| F450W | WFPC2 | drz-sci | drz-wht | drz-rms | drz-neg | drz-con | ||
| F702W | WFPC2 | drz-sci | drz-wht | drz-rms | drz-neg | drz-con | ||
cURL scripts for bulk downloading spectra and graphics files can be downloaded from the table below. A direct link to the merged summary PDF is linked at the bottom of the table.
| File Type | cURL Scripts |
Estimated Download Size |
|---|---|---|
| Spectra | 1d | 2d | 0.4 GB | 2.5 GB |
| Graphics | summary | statmorph | 0.6 GB | 0.9 GB |
|
Merged summary pdf (direct link) |
30.5 MB |