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J/AJ/119/486 HDF-S: STIS imaging (Gardner+, 2000)
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The Hubble Deep Field South: STIS imaging.
Gardner J.P., Baum S.A., Brown T.M., Carollo C.M., Christensen J.,
Dashevsky I., Dickinson M.E., Espey B.R., Ferguson H.C., Fruchter A.S.,
Gonnella A.M., Gonzalez-Lopezlira R.A., Hook R.N., Kaiser M.E., Martin C.L.,
Sahu K.C., Savaglio S., Smith T.E., Teplitz H.I., Williams R.E., Wilson J.
<Astron. J. 119, 486 (2000)>
=2000AJ....119..486G
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ADC_Keywords: Galaxies, photometry ; Photometry, CCD ; Photometry, ultraviolet
Mission_Name: HST
Keywords: cosmology: observations - galaxies: evolution - galaxies: statistics -
surveys
Abstract:
We present the imaging observations made with the Space Telescope
Imaging Spectrograph (STIS) of the Hubble Deep Field South. The field
was imaged in four bandpasses: a clear CCD bandpass for 156ks, a
long-pass filter for 22-25ks/pix typical exposure, a near-UV bandpass
for 23ks, and a far-UV bandpass for 52ks. The clear, visible image is
the deepest observation ever made in the UV-optical wavelength region,
reaching a 10{sigma}AB magnitude of 29.4 for an object of area
0.2arcsec^2^. The field contains QSO J2233-606, the target of the STIS
spectroscopy, and extends 50"x50" for the visible images, and 25"x25"
for the ultraviolet images. We present the images, catalog of objects,
and galaxy counts obtained in the field.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 97 674 The catalog
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See also:
J/A+AS/145/111 : HDF-South catalogue of galaxies (Volonteri+, 2000)
J/ApJ/538/493 : HDF-South NICMOS field (Yahata+, 2000)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- [GBB2000] Identification number ([GBB2000] NNNNN)
7- 8 I2 h RAh Right ascension (J2000)
10- 11 I2 min RAm Right ascension (J2000)
13- 17 F5.2 s RAs Right ascension (J2000)
19 A1 --- DE- Declination sign (J2000)
20- 21 I2 deg DEd Declination (J2000)
23- 24 I2 arcmin DEm Declination (J2000)
26- 29 F4.1 arcsec DEs Declination (J2000)
31- 37 F7.2 pix Xpos X position (1)
39- 45 F7.2 pix Ypos Y position (1)
47- 51 F5.2 mag mj Isophotal 50CCD magnitude
(filterless, 200-1000nm) (2)
53- 57 F5.2 mag ma ? MAG_AUTO 50CCD magnitude
(filterless, 200-1000nm) (2)
59 A1 --- l_50CCD-LP Limit flag on 50CCD-LP
60- 64 F5.2 mag 50CCD-LP Isophotal color, 50CCD-F28X50LP
(F28X50LP: red, 550-1000nm) (3)
66 A1 --- l_NUV-50CCD Limit flag on NUV-50CCD
67- 71 F5.2 mag NUV-50CCD ? Isophotal color NUVQZT-50CCD
(NUVQZT: 150-350nm) (4)
73 A1 --- l_FUV-50CCD Limit flag on FUV-50CCD
74- 78 F5.2 mag FUV-50CCD ? Isophotal color FUVQTZ-50CCD
(FUVQZT: 150-200nm) (4)
80- 83 I4 mas rh ? Half-light radius of the object in the
50CCD image (5)
85- 88 F4.2 --- s/g [0,1] Star/Galaxy classification parameter (6)
90- 97 A8 --- Flags Flags (7)
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Note (1): The x and y pixel positions of the object on the 50CCD and
F28X50LP images. To obtain the x and y pixel positions on the MAMA
images, subtract 400 from each.
Note (2): The magnitudes are given in the AB system (Oke, 1971ApJ...170..193O),
where m=-2.5logf_{nu}_-48.60.
The isophotal magnitude is determined from the sum of the counts
within the detection isophote, set to be 0.65{sigma}.
The MAG_AUTO is an elliptical Kron (1980ApJS...43..305K) magnitude,
determined from the sum of the counts in an elliptical aperture. The
semimajor axis of this aperture is defined by 2.5 times the first
moments of the flux distribution within an ellipse roughly twice the
isophotal radius. However if the aperture defined this way would have
a semimajor axis smaller than 3.5 pixels, a 3.5 pixel value is used.
Note (3): Isophotal color, 50CCD-F28X50LP, in the AB magnitude system,
as determined in the 50CCD isophote. SExtractor was run in two-image
mode to determine the photometry in the F28X50LP image, using the
50CCD image as the detection image. When the measured F28X50LP flux is
less than 2{sigma}, we determine an upper limit to the color using the
flux plus 2{sigma} when the measured flux is positive and 2{sigma}
when the measured flux is negative. We did not clip the 50CCD
photometry.
Note (4): Isophotal colors, NUVQTZ-50CCD and FUVQTZ-50CCD, in the
AB magnitude system. Photometry in the MAMA images are discussed
above. Photometry of objects falling partially outside the MAMA image
are flagged and should not be considered reliable. When the measured
flux is less than 2{sigma}, we give lower limits to the color as
discussed above.
Note (5): The half-light radius was determined by SExtractor to be
the radius at which a circular aperture contains half of the flux in
the MAG_AUTO elliptical aperture.
Note (6): A star-galaxy classification parameter determined by a neural
network within SExtractor, and based upon the morphology of the object
in the 50CCD images (see Bertin & Arnouts, 1996A&AS..117..393B, for a
detailed description of the neural network). Classifications near 1.0
are more like a point source, while classifications near 0.0 are more
extended.
Note (7): Flags:
a: object has near neighbors (50CCD)
b: object was originally blended with another (50CCD)
c: at least one pixel is saturated (50CCD)
d: object's aperture data is incomplete or corrupted (50CCD)
e: object is off the image or within 30 pixels of the edge (50CCD)
f: object lies on top of a diffraction spike (50CCD)
g: photometry is from the second run of SExtractor (50CCD)
h: object is off the image or within 30 pixels of the edge (F28X50LP)
i: object lies on top of a diffraction spike (F28X50LP)
j: photometry is from the second run of SExtractor (F28X50LP)
k: object is completely off the image (NUV)
l: object is partially off the image (NUV)
m: used global sky value (NUV)
n: object is completely off the image (FUV)
o: object is partially off the image (FUV)
p: used global sky value (FUV)
q: target QSO J2233-606.
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History: From AJ electronic version
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(End) James Marcout, Patricia Bauer [CDS] 20-Mar-2000