Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.5402m&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #54.02; Bulletin of the American Astronomical Society, Vol. 26, p.1404
Astronomy and Astrophysics
Astronomy
Scientific paper
We present ground-based optical (BVRI) and infrared (JHK) photometry for 15 galaxy fields previously observed with HST as part of the Medium-Deep Survey. We use the HST images to determine bulge and disk scale-lengths at 0.1 - 0.2'' FWHM for 70 galaxies in the V and I-bands. We constrain their star-formation history from their ground-based + HST BVRIJHK colors. For galaxies too faint for MMT spectroscopy, we use their BVRIJHK photometry to constrain their redshift-range through Bruzual's (1990) spectral evolution models. Comparing these photometric redshift estimates to spectroscopic redshifts for a brighter subsample, we find acceptable agreement.We conclude this is an efficient way of finding large numbers of field galaxies with z >= 0.8. Using photometric redshift estimates, we extend the Theta -z relation for HST bulges and disks (using world models with q_o = 0.0 - 1.0, see Mutz et al. 1994, ApJL, 434, L055) to z >= 0.8 (V >= 24 mag), beyond most ground-based spectroscopy. We also observed three brighter (17.5 <= I <= 19.0) galaxies with spectroscopic redshifts of z = 0.12 - 0.28 in the K-band with the Steward 90 inch FASTTRAC tip/tilt corrector system. Under seeing conditions of 1.75'' FWHM for a single image of 1.0 second, we derived K-band imaging with FWHM = 1.076'' for a stack of 158 60-second images. We present their V, I, and K-band light profiles, and V-I and I-K color gradients. The V-I and V-K color profiles show that the object at z = 0.12 is likely an early-type galaxy with an exponentially declining star formation parameter mu = 0.4. The object at z = 0.23 is an early-type galaxy with mu = 0.7. The object at z = 0.28 is a late-type disk galaxy seen nearly edge-on. We discuss using FASTTRAC under better seeing conditions and at telescopes with a more optimal ratio of Fried-parameter to mirror-diameter. This work was supported by NASA/HST grants GO-2684-0*-93A from STScI, which is operated by AURA, Inc., under NASA contract NAS5-26555.
Close Laird
Griffiths Richard E.
McCarthy Dermot
Mutz Steven B.
Neuschaefer Lyman W.
No associations
LandOfFree
The HST Medium Deep Survey: Steward BVRIJK and FASTTRAK JHK imaging and photometry of faint field galaxies from parallel WF/PC images does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The HST Medium Deep Survey: Steward BVRIJK and FASTTRAK JHK imaging and photometry of faint field galaxies from parallel WF/PC images, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The HST Medium Deep Survey: Steward BVRIJK and FASTTRAK JHK imaging and photometry of faint field galaxies from parallel WF/PC images will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1321149