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J/AJ/121/3048 Multicolor photometry in NGC 1512 and NGC 5248 (Maoz+, 2001)
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An ultraviolet through infrared look at star formation and super star clusters
in two circumnuclear starburst rings.
Maoz D., Barth A.J., Ho L.C., Sternberg A., Filippenko A.V.
<Astron. J. 121, 3048 (2001)>
=2001AJ....121.3048M
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ADC_Keywords: Galaxies, photometry ; Photometry, ultraviolet ;
Photometry, infrared
Keywords: galaxies: individual (NGC 1512, NGC 5248) - galaxies: starburst -
galaxies: star clusters
Mission_Name: HST
Abstract:
We present broadband (U, V, I, and H) and narrowband (H{alpha}+[N II]
and Pa{alpha}) images of the circumnuclear starburst rings in two
nearby spiral galaxies, NGC 1512 and NGC 5248, obtained with the WFPC2
and NICMOS cameras on HST. Combined with previously published
ultraviolet (UV) HST images at 2300{AA} these data provide a
particularly wide wavelength range with which to study the properties
of the stellar populations, the gas, and the dust in the rings.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 110 475 Compact sources brightest in V - NGC 1512
table4.dat 110 507 Compact sources brightest in V - NGC 5248
table5.dat 64 248 Cluster ages, extinctions and masses - NGC 1512
table6.dat 64 308 Cluster ages, extinctions and masses - NGC 5248
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Byte-by-byte Description of file: table3.dat table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ELC Compact source number
([MBH2001 NGC NNNN ELC NN in Simbad)
5- 10 F6.2 pix Xpix X pixel PC coordinate in the F547M frame
12- 17 F6.2 pix Ypix Y pixel PC coordinate in the F547M frame
19- 24 F6.2 arcsec oRA Right Ascension offset from
galaxy nucleus (1)
26- 31 F6.2 arcsec oDE Declination offset from
galaxy nucleus (1)
33- 37 F5.2 mag Vmag ? The V band magnitude
39- 42 F4.2 mag Del1-3 ? Magnitude difference between F547M
photometry (about Stroemgren y) in
3-pixel and 1-pixel radius aperture
44 A1 --- l_F2300 Limit flag on F2300 (2)
45- 51 F7.1 10-21W/m2/nm F2300 ? The f_{lambda}_ flux at 2300{AA} (3)
53- 58 F6.1 10-21W/m2/nm e_F2300 ? The one {sigma} error in F2300 (4)
60 A1 --- l_F3350 Limit flag on F3350 (2)
61- 66 F6.1 10-21W/m2/nm F3350 ? The f_{lambda}_ flux at 3350{AA} (3)
68- 72 F5.1 10-21W/m2/nm e_F3350 ? The one {sigma} error in F3350 (U) (4)
74 A1 --- l_F5490 Limit flag on F5490 (2)
75- 80 F6.1 10-21W/m2/nm F5490 The f_{lambda}_ flux at 5490{AA} (V) (3)
82- 85 F4.1 10-21W/m2/nm e_F5490 ? The one {sigma} error in F5490 (4)
87 A1 --- l_F8040 Limit flag on F8040 (2)
88- 92 F5.1 10-21W/m2/nm F8040 The f_{lambda}_ flux at 8040{AA} (I) (3)
94- 97 F4.1 10-21W/m2/nm e_F8040 ? The one {sigma} error in F8040 (4)
99 A1 --- l_F1.6 Limit flag on F1.6 (2)
100-104 F5.1 10-21W/m2/nm F1.6 ? The f_{lambda}_ flux at 1.6{mu}m (H)
(3)(4)
106-109 F4.1 10-21W/m2/nm e_F1.6 ? The one {sigma} error in F1.6 (4)
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Note (1): Galaxy nucleus of NGC 1512 (table3.dat) is at pixel coordinates
419.6, 390.7.
Galaxy nucleus of NGC 5248 (table4.dat) is at pixel coordinates
422.16, 396.02
Note (2): For null detections, the flux limits actually depend on the local
background and crowding, and the limits quoted are just those
typical for the band.
Note (3): Fluxes are in units of 10^-19^ergs/s/cm^2^/{AA}
Note (4): Missing entries are for sources outside the field of view of the
FOC or NICMOS.
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Byte-by-byte Description of file: table5.dat table6.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- CS Compact source number
([MBH2001] NGC NNNN CS NNN in Simbad)
5 I1 --- o_CS Number of bands source observed in (1)
7- 9 I3 Myr B-Age Best fitting model age
11- 13 F3.1 mag B-AV Best fitting model V band extinction
15- 19 F5.2 10+4solMass B-Mass Best fitting model mass
21- 25 F5.2 --- B-chi2 Reduced {chi}^2^ of best fitting model
27- 29 I3 Myr Y-Age ? Youngest acceptable model age
31- 33 F3.1 mag Y-AV ? Youngest acceptable model V band
extinction
35- 39 F5.2 10+4solMass Y-Mass ? Youngest acceptable model mass
41- 44 F4.2 --- Y-chi2 ? Reduced {chi}^2^ of youngest acceptable
model
46- 48 I3 Myr O-Age ? Oldest acceptable model age
50- 52 F3.1 mag O-AV ? Oldest acceptable model V band extinction
54- 58 F5.2 10+4solMass O-Mass ? Oldest acceptable model mass
60- 63 F4.2 --- O-chi2 ? Reduced {chi}^2^ of oldest acceptable
model
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Note (1): Objects with detections in fewer than 4 bands not fitted. Formally
``acceptable'' models have {chi}^2^ per degree of freedom <2.
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History:
From electronic version of the journal
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(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 11-Sep-2001