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Beginning of ReadMe :B/avo.rad MERLIN+VLA images of HDF/HFF sources (Muxlow+, 2003)
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High Resolution Images of Radio Sources in the Hubble Deep and Flanking Fields
Muxlow T.W.B, Richards A.M.S, Garrington S.T., Wilkinson P.N.
Anderson B.A., Richards E.A., Axon D.J., Partridge R.B.,
Kellermann K.I., Fomalont E.B.
Muxlow T.W.B, et al. MNRAS (in press)
<Mon. Not. R. Astron. Soc. in press (2003)>
=2003MNRAS.(in.press)
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ADC_Keywords: Radio sources ; Surveys
Keywords: galaxies: evolution - galaxies: active - galaxies: starburst -
cosmology: observations - radio continuum: galaxies
Abstract:
18 days of MERLIN data and 42 hours of A-array VLA data at 1.4 GHz
have been combined to image a 10 arcminute field centred on the Hubble
Deep Field. This area includes both the Hubble Deep and Flanking
Fields. A complete sample of 92 sources with flux densities above
40muJy have been detected using the VLA data, and imaged with the
MERLIN+VLA combination at resolutions of 0.2, 0.3 and 0.5 arcsecond.
These are the most sensitive 1.4 GHz images yet made, with rms noise
levels of 3.3muJy/beam in the 0.2 arcsecond images. Virtually all
the objects are resolved by the MERLIN+VLA combination images showing
that they have angular sizes in the range 0.2 to 3 arcseconds,
typically smaller than the sizes of the optical galaxy images. In
addition to the imaging of 92 sources found with the VLA alone, the
central 3 arcminutes, which encloses the HDF, has been separately
imaged with the MERLIN+VLA combination at the full 3.3muJy/beam
sensitivity to search for compact sources fainter than 40muJy. No
additional sources were found that were not previously detected by the
VLA, indicating that such sources are heavily resolved with MERLIN and
hence must have typical angular sizes >0.5 arcseconds. In addition to
the images, high quality astrometry is an equally important product of
this work allowing reliable source identification in a crowded field.
Radio sources associated with compact galaxies have been used to align
both the HST WFPC2 frames and a CFHT optical field to the ICRF. The
HST optical field has been aligned to better than 50 mas in the Deep
Field itself, and to 150 mas in the outer parts of the Flanking
Fields. The proportion of starburst systems is found to increase with
decreasing source strength. At fluxes below 100muJy in excess of 70%
of the muJy sources are found to be starburst type systems
associated with major disc galaxies in the redshift range 0.3 - 1.3.
Some 40% of the brighter sources are found to be intermediate
luminosity AGN systems identified with galxies in a similar redshift
range. Around 85% of the sources are identified with galaxies brighter
than I=25mag. The remaining 15% are associated with optically faint
systems close to or beyond the HDF limit; many of these may be
dust-shrouded starburst galaxies at high redshift (z>3). Approaching
half the sources in the 10 arcminute field are detected in X-rays by
the Chandra Satellite. The X-ray detection rate appears to be
uncorrelated with the radio source classification.