J/A+A/639/A28 Catalog of super star clusters in IRAS 17138-1017 (Lam+, 2020)
High angular resolution study of the super star cluster population in
IRAS 17138-1017.
Lam N.T., Gratadour D., Rouan D., Grosset L.
<Astron. Astrophys. 639, A28 (2020)>
=2020A&A...639A..28L 2020A&A...639A..28L (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, IR ; Clusters, open ; Infrared sources ;
Photometry, infrared ; Photometry, CCD
Keywords: galaxies: individual: IRAS 17138-1017 - galaxies: starburst -
galaxies: star clusters: general - radiative transfer -
infrared: galaxies - instrumentation: high angular resolution
Abstract:
Currently, the global characteristics and evolution of super star
clusters (SSCs) are not well understood, due to the large distances to
their host galaxies. We aim to study the population of SSCs in IRAS
17138-1017, a luminous infrared galaxy (LIRG), in terms of age,
extinction, mass, and luminosity distribution. We analyzed imaging
data in the near-infrared from the GeMS/GSAOI instrument on the Gemini
telescope and generated simulations with the radiative transfer code
MontAGN. The extraction of SSCs from the images and their photometry
in J, H, and Ks allowed us to derive color-color and color-magnitude
diagrams. Comparison with a theoretical stellar evolutionary track
gives a first hint into the extinction towards each SSC, as well as
their ages, despite some degeneracy between those two quantities.
Spectra given by our radiative transfer code MontAGN, which includes
dust emission, also provide insightful predictions and comparisons. We
detect with a fair degree of confidence 54 SSCs of m_Ks between 16 mag
and 21 mag with a median instrumental uncertainty of 0.05 mag. When
plotted on a color-color diagram and a color-magnitude diagram, it
appears that most of the sources are very much extinct with respect to
an intrinsic theoretical evolutionary track. Once de-reddened, the
colors point unambiguously to two distinct and very recent starburst
episodes at 2.8 and 4.5Myr. While the SSCs in the 4.5Myr starburst
are distributed along the spiral arms, the 2.8Myr SSCs are
concentrated in the central region. The luminosity and mass functions
present a classical power-law behavior, although with shallower slopes
than generally observed in LIRGs. Comparison with radiative transfer
simulations shows that, especially for the youngest SSCs, the thermal
emission by dust is not negligible and could explain the few very red
SSCs that could not be de-reddened safely. This effect could lead to a
misevaluation of the age of the starburst by at most 1 or 2Myr.
Description:
Table 1 lists the final sample of detected SSCs in IRAS 17138-1017
with their coordinates, photometry in J, H and Ks, and their derived
extinctions, ages, masses. Observations were made in J, H, and Ks
bands on 15 April 2014 using GSAOI, the Gemini South Adaptive Optics
Imager fed by GeMS, the Gemini Multi-Conjugate Adaptive Optics System.
Calibrated with 2MASS, the average astrometric error is 0.2" and the
photometric errors for J, H, and Ks band zero points are 0.04mag,
0.09mag, and 0.11mag respectively. The extinctions, ages, and masses
were estimated by fitting the (J-H) and (H-Ks) colors to a Starburst99
evolutionary track.
Objects:
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RA (2000) DE Designation(s)
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17 16 35.7 -10 20 38 IRAS 17138-1017 = LEDA 59990
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 107 54 Catalog of super star clusters in IRAS 17138-1017
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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- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 13 F7.4 s RAs Right ascension (J2000)
15 A1 --- DE- Declination sign (J2000)
16- 17 I2 deg DEd Declination (J2000)
19- 20 I2 arcmin DEm Declination (J2000)
22- 28 F7.4 arcsec DEs Declination (J2000)
30- 34 F5.2 mag Jmag J-band apparent Vega magnitude
36- 39 F4.2 mag e_Jmag Uncertainty in J-band instrumental magnitude
41- 45 F5.2 mag Hmag H-band apparent Vega magnitude
47- 50 F4.2 mag e_Hmag Uncertainty in H-band instrumental magnitude
52- 56 F5.2 mag Ksmag Ks-band apparent Vega magnitude
58- 61 F4.2 mag e_Ksmag Uncertainty in Ks-band instrumental magnitude
63- 67 F5.2 mag Av Cluster V-band extinction
69- 72 F4.2 mag E_Av Upper bound of the cluster V-band extinction
74- 77 F4.2 mag e_Av Lower bound of the cluster V-band extinction
79- 82 F4.2 [yr] logAge Cluster age in log10(t/yr)
84- 87 F4.2 [yr] E_logAge Upper bound of the cluster age
89- 92 F4.2 [yr] e_logAge Lower bound of the cluster age
94- 97 F4.2 [Msun] logMass Cluster mass in log10(M/M☉)
99-102 F4.2 [Msun] E_logMass Upper bound of the cluster mass
104-107 F4.2 [Msun] e_logMass Lower bound of the cluster mass
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Acknowledgements:
Nguyen Tung Lam, lam.nguyen(at)obspm.fr
(End) Nguyen Tung Lam [LESIA], Patricia Vannier [CDS] 05-May-2020