J/AJ/143/43 NIR photometry of NGC 604 star-forming region (Farina+, 2012)
Unveiling the new generation of stars in NGC 604 with Gemini-NIRI.
Farina C., Bosch G.L., Barba R.H.
<Astron. J., 143, 43 (2012)>
=2012AJ....143...43F 2012AJ....143...43F
ADC_Keywords: Photometry, infrared ; H II regions
Keywords: galaxies: starburst - galaxies: star clusters: individual (NGC 604) -
H II regions - infrared: stars - stars: formation
Abstract:
We present a near-infrared study focused on the detection and
characterization of the youngest stellar component of the NGC 604
giant star-forming region in the Triangulum galaxy (M 33). By means of
color-color diagrams derived from the photometry of JHKs images taken
with the Gemini Near Infrared Imaging and Spectrometer (NIRI), we have
found 68 candidate massive young stellar objects. The spatial
distribution of these sources matches the areas where previous studies
suggested that star formation might be taking place, and the high
spatial resolution of our deep NIRI imaging allows us to pinpoint the
star-forming knots. An analysis of the fraction of objects that show
infrared excess suggests that the star formation is still active,
supporting the presence of a second generation of stars being born,
although the evidence for or against sequential star formation does
not seem to be conclusive.
Description:
The observations were made using the Gemini-North telescope with NIRI
(Near Infrared Imaging and Spectrometer) during the nights of 2005
September 8 and 11 (Proposal GN-2005B-Q-3). The images were taken
under excellent seeing conditions, averaging 0.35" FWHM measured in
the J, H, and Ks bands.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 72 3627 Final JHKs photometry table
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See also:
J/MNRAS/411/263 : JHK variable stars in M33 (Javadi+ 2011)
J/ApJ/705/1364 : MIR catalog of point sources in M33 (Thompson+, 2009)
J/A+A/487/131 : JHKs photometry of LPVs in M33 (Cioni+, 2008)
J/ApJ/664/850 : Spitzer observations of stars in M33 (McQuinn+, 2007)
J/AJ/131/2478 : M31 and M33 UBVRI photometry (Massey+, 2006)
J/AJ/121/861 : BVI photometry of central part of M33 (Macri+, 2001)
J/ApJ/505/793 : New WR star in M33 (Massey+, 1998)
J/ApJ/456/174 : Intermediate-Mass Population in NGC 604 (Hunter+ 1996)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Labe l Explanations
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1- 4 I4 --- ID [53/4427] Internal object identification number
(<[FBB2012] NNNN> in Simbad)
5 A1 --- f_ID [*] *: object which exhibits IR excess
7- 16 F10.7 deg RAdeg [23.61/23.66] Right Ascension in decimal
degrees (J2000)
18- 27 F10.7 deg DEdeg [30.76/30.80] Declination in decimal degrees (J2000)
29- 33 F5.2 mag Jmag Apparent magnitude in MKO J filter (1)
35- 38 F4.2 mag e_Jmag The error in Jmag (1)
40- 44 F5.2 mag Hmag Apparent magnitude in MKO H filter (1)
46- 49 F4.2 mag e_Hmag The error in Hmag (1)
51- 55 F5.2 mag Ksmag Apparent magnitude in MKO Ks filter (1)
57- 60 F4.2 mag e_Ksmag The error in Ksmag (1)
62- 66 F5.2 mag J-H [-0.58/4.75] The (J-H) color index
68- 72 F5.2 mag H-Ks [-1.97/2.2] The (H-Ks) color index
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Note (1): The instrumental magnitudes were transformed to the Mauna Kea
Observatory (MKO) infrared photometric system, by means of aperture
photometry performed on the standard stars.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 19-Apr-2013