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J/ApJ/546/694       NICMOS star formation history            (Thompson +, 2001)

Star formation history in the NICMOS Northern Hubble Deep Field. Thompson R.I., Weymann R.J., Storrie-Lombardi L.J. <Astrophys. J. 546, 694 (2001)> =2001ApJ...546..694T
ADC_Keywords: Galaxies, photometry ; Redshifts ; Extinction ; Photometry, infrared Mission_Name: HST Keywords: Cosmology: observations - galaxies: evolution - galaxies: fundamental parameters - galaxies: starburst - stars: formation Abstract: We present the results of an extensive analysis of the star formation rates determined from the NICMOS deep images of the northern Hubble Deep Field. We use SED template fitting photometric techniques to determine both the redshift and the extinction for each galaxy in our field. Measurement of the individual extinctions provides a correction for star formation hidden by dust obscuration. We determine star formation rates for each galaxy based on the 1500Å UV flux and add the rates in redshift bins of width 1.0 centered on integer redshift values. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 104 281 Listing of measured quantities
See also: J/AJ/112/1335 : Hubble Deep Field observations (Williams+ 1996) J/AJ/117/17 : Hubble Deep Field near-IR obs. (Thompson+, 1999) J/ApJ/538/493 : HDF-South NICMOS field (Yahata+, 2000) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 F10.5 --- NICMOS NICMOS identification number (1) 12- 19 A8 --- [WBD96] WFPC identification number from Williams et al., 1996, Cat. J/AJ/112/1335 21- 24 F4.2 --- z Redshift 26- 29 F4.2 mag E(B-V) (B-V) color excess 31- 37 F7.3 solMass/yr SFR Star formation rate determined in Section 5 39- 46 E8.2 solLum Lum Bolometric luminosity (2) 48- 51 F4.2 --- Frac Fraction of the luminosity removed by extinction and re-emitted in the mid & far-IR 53- 60 E8.2 mJy SCUBA ? The SCUBA 850 microns flux 62- 64 F3.1 --- Temp Template number of best fit between 1.0 (early-cold) and 6.0 (late-hot) 66- 69 F4.1 --- Chi2 Modified Chi^2^ of the fit from Equ. 1 (3) 71- 74 F4.1 mag Totmag ? The F160W AB magnitude (4) 76- 79 F4.1 mag Apmag ? The 0.6" diameter aperture F160W magnitude See note (5) 81- 82 I2 h RAh Right Ascension (J2000) 84- 85 I2 min RAm Right Ascension (J2000) 87- 91 F5.2 s RAs Right Ascension (J2000) 93 A1 --- DE- Declination (J2000) 94- 95 I2 deg DEd Declination (J2000) 97- 98 I2 arcmin DEm Declination (J2000) 100-104 F5.2 arcsec DEs Declination (J2000)
Note (1): Objects with ID numbers less than 1000 are objects that are identified with sources in the original KFOCAS catalog of Thompson et al., 1999, Cat. J/AJ/117/17, [TSW99] NNN.NNN in Simbad. Objects with catalog numbers greater than or equal to 1000 are SExtractor objects that did not match in position with an original catalog entry to within 0.3". Note (2): The flux of a galaxy is obtained by integrating over the unextincted selected template scaled by the factor A from equation 2. The bolometric luminosity then follows from the redshift and our adopted cosmology. Note (3): It should be noted that the distribution of the modified chi2 values will not rigorously follow a true chi2 distribution. The values are provided to give a qualitative indication of the relative goodness of fit for the best fit values of redshift, template type and E(B-V) from object to object. Note (4): Derived from the aperture correction method described in Yan et al., 1998ApJ...503L..19Y. Note (5): If no magnitude is listed the object had a zero or negative measured F160W flux.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 09-Mar-2001
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