J/ApJ/671/333 Aperture photometry in NGC 5194 (Kennicutt+, 2007)
Star formation in NGC 5194 (M51a).
II. The spatially resolved star formation law.
Kennicutt R.C.Jr, Calzetti D., Walter F., Helou G., Hollenbach D.J.,
Armus L., Bendo G., Dale D.A., Draine B.T., Engelbracht C.W., Gordon K.D.,
Prescott M.K.M., Regan M.W., Thornley M.D., Bot C., Brinks E., De Blok E.,
De Mello D., Meyer M., Moustakas J., Murphy E.J., Sheth K., Smith J.D.T.
<Astrophys. J., 671, 333-348 (2007)>
=2007ApJ...671..333K 2007ApJ...671..333K
ADC_Keywords: Galaxies, photometry
Keywords: galaxies: evolution - galaxies: individual (M51a, NGC 5194) -
galaxies: ISM - H II regions - infrared: galaxies - stars: formation
Abstract:
We have studied the relationship between the star formation rate
(SFR), surface density, and gas surface density in the spiral galaxy
M51a (NGC 5194), using multiwavelength data obtained as part of the
Spitzer Infrared Nearby Galaxies Survey (SINGS). We introduce a new
SFR index based on a linear combination of Halpha emission-line and
24um continuum luminosities, which provides reliable
extinction-corrected ionizing fluxes and SFR densities over a wide
range of dust attenuations.
Description:
Spitzer MIPS observations of M51a at 24um were obtained on 22 and 23
June 2004, as part of the SINGS Legacy Program.
Narrowband images centered at Halpha and continuum R-band images were
obtained on 2001 March 28, with the Cassegrain Focus CCD Imager on the
2.1m telescope at Kitt Peak National Observatory, as part of the
SINGS ancillary data program.
Archival HST/NICMOS images of the central 144", corresponding to the
inner ∼6kpc of the galaxy, are available in the Paα emission line
(1.8756 um, F187N narrow-band filter) and the adjacent continuum
(F190N narrow-band filter).
HI data for M51a have been obtained through The H I Nearby Galaxy
Survey (THINGS), a survey dedicated to obtain high-resolution VLA H I
imaging for ∼35 nearby galaxies. M51 was observed in the VLA D (2004
July 9), C (2004 April 26), and B array (2005 March 5).
The CO J=1-0 map of M51a was obtained as part of the BIMA Survey Of
Nearby Galaxies (BIMA SONG).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 93 315 Aperture Photometry and SFR in NGC 5194
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See also:
J/ApJ/633/871 : Positions and photometry of HII knots in M51 (Calzetti+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID Aperture identification
7- 8 I2 h RAh Hour of Right Ascension (J2000) (1)
10- 11 I2 min RAm Minute of Right Ascension (J2000) (1)
13- 16 F4.1 s RAs Second of Right Ascension (J2000) (1)
19- 20 I2 deg DEd Degree of Declination (J2000) (1)
22- 23 I2 arcmin DEm Arcminute of Declination (J2000) (1)
25- 26 I2 arcsec DEs Arcsecond of Declination (J2000) (1)
29- 30 I2 arcsec Ap Diameter of aperture
33- 37 F5.2 [10-7W] LHa Groundbased Hα luminosity (2)
40- 44 F5.2 [10-7W] LPa ? HST/NICMOS Paα luminosity (2)
47- 51 F5.2 [10-7W] L24um Spitzer/IRAC 24µm luminosity (2)
54- 58 F5.2 [Msun/yr/kpc2] Sigma(SFR) log of SFR surface density (3)
61- 65 F5.3 [Msun/yr/kpc2] e_Sigma(SFR) Uncertainty in Sigma(SFR)
68- 72 F5.2 [cm-2] N(HI) log of HI column density
75- 79 F5.2 [cm-2] N(H2) log of H2 column density
82 A1 --- l_Sigma(H) Upper limit flag on Sigma(H)
83- 86 F4.2 [Msun/pc2] Sigma(H) log of total hydrogen surface density
89- 93 F5.3 [Msun/pc2] e_Sigma(H) ? Uncertainty on Sigma(H)
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Note (1): Of aperture center.
Note (2): In units of erg/s. Stellar continuum luminosities are given as
λL(λ). Luminosities have been corrected for Galactic
foreground extinction E(B-V)MW=0.037mag, but otherwise have not
been corrected for extinction.
Note (3): SFRs for objects with Paα photometry were corrected for
extinction using the Paα/H{alpha) ratio. Otherwise SFRs were
corrected for extinction using the 24micron/Hα ratio as
described in the text.
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History:
From electronic version of the journal
References:
Calzetti et al., Paper I, 2005ApJ...633..871C 2005ApJ...633..871C, Cat. J/ApJ/633/871
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 28-Feb-2010