J/AJ/121/3048 Multicolor photometry in NGC 1512 and NGC 5248 (Maoz+, 2001)
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 2001AJ....121.3048M
ADC_Keywords: Galaxies, photometry ; Photometry, ultraviolet ;
Photometry, infrared
Mission_Name: HST
Keywords: galaxies: individual (NGC 1512, NGC 5248) - galaxies: starburst -
galaxies: star clusters
Abstract:
We present broadband (U, V, I, and H) and narrowband (Hα+[N II]
and Paα) 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 2300Å 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:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 62 32 Emission-Line Complexes
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
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Cluster Cluster name
10- 11 I2 --- ELC Emission-Line Complexe number in the
cluster
([MBH2001 NGC NNNN ELC NN in Simbad)
13- 15 I3 pix Xpos X position
17- 19 I3 pix Ypos Y position
21- 25 F5.2 arcsec DRA Offset in right ascension
from the galaxy nucleus (1)
28- 32 F5.2 arcsec DDE Offset in declination
from the galaxy nucleus (1)
34- 37 F4.2 arcsec Rad Angular radius of circular aperture
used for flux measurements (2)
39- 43 F5.1 10-19W/m2 FHa Line flux in Hα+[NII]
(in F658N filter) (3)
45- 48 F4.1 10-19W/m2 FPaa Line flux in Paα (3)
50- 54 F5.1 10-19W/m2 F1.6um Line flux in 1.6µm (3)
56- 58 F3.1 --- FHa/FPaa Ratio of Hα+[NII] to Paα lines
60- 62 I3 --- FPaa/F1.6um Ratio of Paα to 1.6µm lines
--------------------------------------------------------------------------------
Note (1): Cluster center coordinates:
NGC 1512: 04:03:54.29 (J2000) -43:20:56.7 (419.6, 390.7)
NGC 5248: 13:37:32.0 (J2000) +08:53:08 (422.16, 396.02)
Note (2): At a distance of 10 Mpc, 0.1" corresponds to 5pc
Note (3): At a distance of 10 Mpc this unit corresponds to a luminosity
of 1.2x1036erg/s.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- CS Compact source number
([MBH2001 NGC NNNN CS 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 fλ flux at 2300Å (3)
53- 58 F6.1 10-21W/m2/nm e_F2300 ? The one σ error in F2300 (4)
60 A1 --- l_F3350 Limit flag on F3350 (2)
61- 66 F6.1 10-21W/m2/nm F3350 ? The fλ flux at 3350Å (3)
68- 72 F5.1 10-21W/m2/nm e_F3350 ? The one σ error in F3350 (U) (4)
74 A1 --- l_F5490 Limit flag on F5490 (2)
75- 80 F6.1 10-21W/m2/nm F5490 The fλ flux at 5490Å (V) (3)
82- 85 F4.1 10-21W/m2/nm e_F5490 ? The one σ error in F5490 (4)
87 A1 --- l_F8040 Limit flag on F8040 (2)
88- 92 F5.1 10-21W/m2/nm F8040 The fλ flux at 8040Å (I) (3)
94- 97 F4.1 10-21W/m2/nm e_F8040 ? The one σ 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 fλ flux at 1.6µm (H)
(3)(4)
106-109 F4.1 10-21W/m2/nm e_F1.6 ? The one σ error in F1.6 (4)
--------------------------------------------------------------------------------
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 10-19ergs/s/cm2/Å
Note (4): Missing entries are for sources outside the field of view of the
FOC or NICMOS.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
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 χ2 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 χ2 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 χ2 of oldest acceptable
model
--------------------------------------------------------------------------------
Note (1): Objects with detections in fewer than 4 bands not fitted. Formally
``acceptable'' models have χ2 per degree of freedom <2.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 11-Sep-2001