J/A+A/542/A39 NIR photometry in 10 nearby spiral galaxies (Grosboel+, 2012)
Star formation in grand-design, spiral galaxies. Young, massive clusters in NIR.
Grosbol P., Dottori H.
<Astron. Astrophys. 542, A39 (2012)>
=2012A&A...542A..39G 2012A&A...542A..39G
ADC_Keywords: Galaxies, nearby ; Clusters, open ; Photometry, infrared
Keywords: galaxies: spiral - galaxies: structure -
galaxies: star clusters: general - galaxies: star formation -
infrared: galaxies - techniques: photometry
Abstract:
Spiral structure is a prominent feature in many disk galaxies and is
often outlined by bright, young objects. We study the distribution of
young stellar clusters in grand-design spiral galaxies and thereby
determine whether strong spiral perturbations can influence star
formation.
Description:
Near-infrared (NIR) aperture photometry of sources in 7 arcmin fields
around 10 nearby, grand-design spiral galaxies is presented based on
HAWK-I/VLT observations. The sources were identified using Sextractor
(Bertin & Amouts, 1996A&AS..117..393B 1996A&AS..117..393B) and measured with an aperture
of 1 arcsec diameter. The sources numbers are those of the original
Sextractor search on the Ks maps and are not strictly sequential.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 89 10 List of galaxies
n0157c.dat 133 2254 NIR sources in NGC 157 with Ks<20.2mag
n1232c.dat 133 3177 NIR sources in NGC 1232 with Ks<20.6mag
n1300c.dat 133 614 NIR sources in NGC 1300 with Ks<19.8mag
n1365c.dat 133 2417 NIR sources in NGC 1365 with Ks<20.2mag
n1566c.dat 133 969 NIR sources in NGC 1566 with Ks<19.3mag
n2997c.dat 152 5313 NIR sources in NGC 2997 with Ks<20.1mag
n4030c.dat 133 1196 NIR sources in NGC 4030 with Ks<19.7mag
n4321c.dat 133 1184 NIR sources in NGC 4321 with Ks<19.3mag
n5247c.dat 133 2259 NIR sources in NGC 5247 with Ks<19.8mag
n7424c.dat 113 6137 NIR sources in NGC 7424 with Ks<20.8mag
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [NGC]
5- 8 I04 --- NGC Galaxy NGC number
10- 19 A10 --- MType Morphological Hubble type of galaxy
21- 27 A7 --- Band Observed bands (Brg for Brγ)
29- 32 F4.2 arcsec FWHM Seeing in the final, stacked K-band image
expressed as the full-width at half-maximum
34- 37 F4.1 mag/pix mu5 Ks surface brightness for which a
signal-to-noise ratio of five was reached
39- 43 F5.2 mag MOD Distance modulus (m-M)
45- 48 F4.1 Mpc Dist Distance
50- 51 I2 pc Ds Linear resolution corresponding to distance
53- 55 I3 deg PA position angle adopted for the galaxy
56 A1 --- r_PA Reference for PA (1)
58- 59 I2 deg IA Inclination angle adopted for the galaxy
60 A1 --- r_IA Reference for IA (1)
62- 66 F5.2 mag Klim Limiting K magnitude to a completeness of ∼90%
68- 72 F5.2 mag Hlim Limiting H magnitude to a completeness of ∼90%
74- 78 F5.2 mag Jlim Limiting J magnitude to a completeness of ∼90%
80- 84 F5.2 mag Ylim ?=- Limiting Y magnitude to a completeness of
∼90%
86- 89 I4 --- Ns Total number of sources in the galaxy disk for
which aperture magnitudes could be estimated
is given
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Note (1): References to the projection parameters adopted as follows:
a = Zurita et al. (2002A&A...386..801Z 2002A&A...386..801Z)
b = van Zee & Bryant (1999AJ....118.2172V 1999AJ....118.2172V)
c = Lindblad et al. (1997A&A...317...36L 1997A&A...317...36L)
d = Pence et al. (1990ApJ...357..415P 1990ApJ...357..415P)
e = Hess et al. (2009ApJ...699...76H 2009ApJ...699...76H)
f = Ganda et al. (2006MNRAS.367...46G 2006MNRAS.367...46G)
g = Knapen et al. (1993ApJ...416..563K 1993ApJ...416..563K)
h = Kuno et al. (2007PASJ...59..117K 2007PASJ...59..117K)
i = Becker et al. (1988A&A...203...21B 1988A&A...203...21B)
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Byte-by-byte Description of file: n*.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq Source number within galaxy
7- 16 F10.5 deg RAdeg Right ascension J2000
18- 27 F10.5 deg DEdeg Declination J2000
29- 34 F6.1 arcsec X0 X coordinate on chip relative to galaxy
36- 41 F6.1 arcsec Y0 Y coordinate on chip relative to galaxy
43- 47 I5 --- npix Number of pixels associated to source
49- 52 F4.2 --- cs [0,1] Sextractor class_star index
(0=extended, 1=stellar)
54- 59 F6.2 mag Ksmag Aperture magnitude Ks
61- 65 F5.2 mag e_Ksmag Internal error in Ksmag
67- 72 F6.2 mag/arcsec+2 bgKsmag ? Background surface brightness in Ks
74- 79 F6.2 mag Hmag ? Aperture magnitude H
81- 85 F5.2 mag e_Hmag ? Internal error in Hmag
87- 92 F6.2 mag/arcsec+2 bgHmag ? Background surface brightness in H
94- 99 F6.2 mag Jmag ? Aperture magnitude J
101-105 F5.2 mag e_Jmag ? Internal error in Jmag
107-112 F6.2 mag/arcsec+2 bgJmag ? Background surface brightness in J
114-119 F6.2 mag Ymag ? Aperture magnitude Y
121-125 F5.2 mag e_Ymag ? Internal error in Ymag
127-132 F6.2 mag/arcsec+2 bgYmag ? Background surface brightness in Y
134-139 F6.2 mag Brg ? Aperture magnitude Brγ
141-145 F5.2 mag e_Brg ? Internal error in Brg
147-152 F6.2 mag/arcsec+2 bgBrg ? Background surface brightness in Brg
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Acknowledgements:
Preben Grosbol, pgrosbol(at)eso.org
Horacio Dottori, dottori(at)ufrgs.br
(End) Preben Grosboel [ESO], Patricia Vannier [CDS] 05-Apr-2012