J/A+A/553/A54 M100 (NGC4321) HII region IRAC photometry (Chan+, 2013)
Statistical studies of HII regions in nearby galaxies.
I. Spitzer near-IR luminosities and temperatures, compared with Hα
luminosities, from selected HII regions in M 100.
Chan S.J., Beckman J.E.
<Astron. Astrophys., 553, A54 (2013)>
=2013A&A...553A..54C 2013A&A...553A..54C
ADC_Keywords: Galaxies, nearby ; H II regions ; Photometry, infrared
Keywords: galaxies: individual: M 100 - galaxies: ISM - HII regions -
infrared: galaxies - methods: statistical - infrared: ISM
Abstract:
We systematically study the relations between the Hα luminosity
and the near-IR luminosity and temperature of a set of selected HII
regions in the disc of M100. By using the technique of cross-reference
between the optical Hα image (the catalogue of HII regions in
M100 and the Spitzer IRAC images, we locate the selected HII regions
in the IRAC image frames. By using the chi-squared non-linear fitting
technique, we estimate the IRAC-3-band colour temperature Tcol(IRAC)
of selected HII regions, and calculate their near-IR luminosities.
Description:
The photometric, image in Hα was taken at the 4.2m William
Herschel Telescope, La Palma. The set of HII regions, calibrated in
Hα luminosity, and the image in Hα were obtained from the
SIMBAD archive. The SINGS/IRAC images of M100 were obtained from the
SINGS Public Data Set Archive, http://sings.stsci.edu/ .
Objects:
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RA (2000) DE Designation(s)
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12 22 54.90 +15 49 20.6 M100 = UGC 7450
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 70 78 Measured IRAC fluxes of selected K-HII regions
table2.dat 30 78 Estimated Tcol and L(IRAC) of selected K-HII
regions (with corrections)
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See also:
J/MNRAS/297/255 : HII region catalogue of M100 (Knapen, 1998)
J/MNRAS/424/1636 : Swift/UVOT sources in NGC4321 (M100) (Ferreras+, 2012)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- K-HII HII region identification number, as in
Knappen, 1998, Cat. J/MNRAS/297/255
6- 13 F8.3 pix Xpos X position (1)
15- 22 F8.3 pix Ypos Y position (1)
24- 29 F6.1 uJy F3.6 Spitzer/IRAC 3.6um flux
31- 36 F6.1 uJy F4.5 Spitzer/IRAC 4.5um flux
38- 43 F6.1 uJy F5.8 Spitzer/IRAC 5.8um flux
45- 51 F7.1 uJy F8.0 Spitzer/IRAC 5.6um flux
53- 56 F4.1 % e_F3.6 Relative uncertainty on F3.6
58- 61 F4.1 % e_F4.5 Relative uncertainty on F4.5
63- 66 F4.1 % e_F5.8 Relative uncertainty on F5.8
68- 70 F3.1 % e_F8.0 Relative uncertainty on F8.0
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Note (1): 1 pix = 0.24".
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- K-HII HII region identification number
6- 10 F5.1 K Tcol Colour temperature
12- 14 F3.1 K e_Tcol rms uncertainty on Tcol
16- 22 E7.2 10-7W L(IRAC) IRAC (3.6-8.0µm) luminosity (erg/s)
24- 30 E7.2 10-7W e_L(IRAC) rms uncertainty on L(IRAC)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 08-Oct-2013