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J/ApJ/603/503    HST photometry in NGC 5253 and NGC 3077     (Harris+, 2004)

The recent cluster formation histories of NGC 5253 and NGC 3077: environmental impact on star formation. Harris J., Calzetti D., Gallagher Iii J.S., Smith D.A., Conselice C.J. <Astrophys. J., 603, 503-522 (2004)> =2004ApJ...603..503H
ADC_Keywords: Galaxies, photometry ; Associations, stellar Keywords: galaxies: individual (NGC 3077, NGC 5253) - galaxies: starburst - galaxies: star clusters Abstract: We present multicolor photometry of bright star cluster candidates in the nearby starburst galaxies NGC 3077 and NGC 5253, observed with the Hubble Space Telescope Wide Field Planetary Camera 2 in both broadband (F300W, F547M, and F814W) and narrowband (F487N and F656N) filters on three visits between 1996 and 2001. By comparing the photometry with theoretical population synthesis models, we estimate the age and mass of each star cluster, which provides constraints on the recent star formation histories of the host galaxies. We compare the star cluster populations in these dwarf starburst galaxies with those of the nuclear starburst in the barred spiral M83 and discuss the implications for our understanding of the nature and evolution of starburst events. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 58 32 Log of the exposures table3.dat 110 55 Photometry of clusters in NGC 3077 table4.dat 110 33 Photometry of clusters in NGC 5253 table5.dat 68 243 Photometry of non-cluster objects in NGC 3077 table6.dat 68 391 Photometry of non-cluster objects in NGC 5253
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Name Galay name (NGC 3077 or NGC 5253) 10- 18 A9 --- Exp Exposure identification 20- 29 A10 "YYYY/MM/DD" Date Observation date 31- 46 A16 --- Filt Filter 48- 51 I4 s Texp Exposition time 53- 58 F6.2 deg PA Position angle
Byte-by-byte Description of file: table3.dat table4.dat
Bytes Format Units Label Explanations
1- 13 A13 --- [HCG2004] Identification number, NGC 3077 C NN or NGC 5253 C NN 15- 16 I2 h RAh Hour of Right Ascension (J2000) 18- 19 I2 min RAm Minute of of Right Ascension (J2000) 21- 25 F5.2 s RAs Second of Right Ascension (J2000) 27 A1 --- DE- Sign of Declination (J2000) 28- 29 I2 deg DEd Degree of Declination (J2000) 31- 32 I2 arcmin DEm Arcminute of Declination (J2000) 34- 38 F5.2 arcsec DEs Arcsecond of Declination (J2000) 40- 45 F6.3 mag F300W ?=99.999 WFPC2 F300W band magnitude 47- 52 F6.3 mag F547W WFPC2 F547W band magnitude 54- 59 F6.3 mag F814W ?=99.999 WFPC2 F814W band magnitude 61- 64 F4.2 mag E(B-V) The (B-V) color excess 65 A1 --- n_E(B-V) [d] Note on E(B-V) (4) 67- 69 I3 10+3solMass MassP ? Photometric mass (1) 71- 72 I2 10+3solMass MassPu ? Upper limit of photometric mass range 73 A1 --- --- [-] 74- 76 I3 10+3solMass MassPl ? Lower limit of photometric mass range 78- 80 I3 Myr AgeP ? Photometric age (1) 82- 84 I3 Myr AgePl ? Lower limit of photometric age range (1) 85 A1 --- --- [-] 86- 88 I3 Myr AgePu ? Upper limit of photometric age range (1) 90- 93 I4 0.1nm EWHa Hα equivalent width 95- 96 I2 Myr AgeHa ? Halpha age (2) 98- 99 I2 Myr AgeHal ? Lower limit of Halpha age range (2) 100 A1 --- --- [-] 101-102 I2 Myr AgeHau ? Upper limit of Halpha age range (2) 104-106 I3 10+3solMass Mass ? Mass (3) 108-110 I3 Myr Age ? Age (3)
Note (1): Mass and age estimates from broadband photometry. There are no estimates for points that are farther than 5σ from the Starburst99 model track. Note (2): Age estimates from EW(Hα). There is no estimate when EW(Hα) is not detected, although these clusters are likely older than 10-20Myr. Note (3): Final mass and age estimates, combining constraints from the broadband photometry and EW(Hα) Note (4): The E(B-V) estimate for theses objects was manually adjusted to bring its photometric age estimate into agreement with its EW(Hα)
Byte-by-byte Description of file: table5.dat table6.dat
Bytes Format Units Label Explanations
1- 15 A15 --- [HCG2004] Identification number, NGC 3077 NC NNN or NGC 5253 NC NNN 17- 18 I2 h RAh Hour of Right Ascension (J2000) 20- 21 I2 min RAm Minute of of Right Ascension (J2000) 23- 27 F5.2 s RAs Second of Right Ascension (J2000) 29 A1 --- DE- Sign of Declination (J2000) 30- 31 I2 deg DEd Degree of Declination (J2000) 33- 34 I2 arcmin DEm Arcminute of Declination (J2000) 36- 39 F4.1 arcsec DEs Arcsecond of Declination (J2000) 41- 46 F6.3 mag F300W ? WFPC2 F300W band magnitude 48- 53 F6.3 mag F547W ? WFPC2 F547W band magnitude 55- 60 F6.3 mag F814W ? WFPC2 F814W band magnitude 62- 65 F4.2 mag E(B-V) The (B-V) color excess 67 I1 --- Class Classification (1)
Note (1): Classification uses the following numbers: 1 = star 2 = ambiguous star/cluster class 3 = detected in only one filter
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 07-May-2004
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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