J/AJ/161/206 Infrared imaging of new born cluster H72.97-69.39 (Andersen+, 2021)
The stellar content of H72.97-69.39, a potential super star cluster in the
making.
Andersen M., Zinnecker H., Hirschauer A.S., Nayak O., Meixner M.
<Astron. J., 161, 206-206 (2021)>
=2021AJ....161..206A 2021AJ....161..206A (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds; Star Forming Region; Stars, pre-main sequence;
Photometry, infrared
Keywords: Star formation; Large Magellanic Cloud; Young star clusters
Pre-main sequence stars; Luminosity function
Abstract:
Young massive clusters and super star clusters (SSCs) represent an
extreme mode of star formation. Far-infrared imaging of the Magellanic
Clouds has identified one potential embedded SSC,
HSO-BMHERICC-J72.971176-69.391112 (H72.97-69.39 in short), in the
southwest outskirts of the Large Magellanic Cloud. We present Gemini
Flamingos 2 and GSAOI near-infrared imaging of a 3'x3' region around
H72.97-69.39 in order to characterize the stellar content of the
cluster. The stellar content is probed down to 1.5M☉. We find
substantial dust extinction across the cluster region, extending up to
AK of 3. Deeply embedded stars are associated with ALMA-detected
molecular gas suggesting that star formation is ongoing. The high
spatial resolution of the GSAOI data allows identification of the
central massive object associated with the 13CO ALMA observations
and detection of fainter low-mass stars around the H30α ALMA
source. The morphology of the molecular gas and the nebulosity from
adjacent star formation suggest they have interacted covering a region
of several parsecs. The total stellar content in the cluster is
estimated from the intermediate and high-mass stellar content to be at
least 10000M☉, less than R136 with up to 100000M☉ within 4.7pc
radius, but places it in the regime of an SSC. Based on the extinction
determination of individual stars we estimate a molecular gas mass in
the vicinity of H72.97-69.39 of 6600M☉, suggesting more star
formation can be expected.
Description:
N79 has been imaged using the natural seeing infrared imager
Flamingos2 and the Multiconjugate Adaptive Optics system (MCAO)
assisted imager Gemini South Adaptive Optics Imager (GSAOI), both
mounted on Gemini South.
We obtained Flamingos 2 (F2) JHKs imaging of N79. The field of view is
6farcm1 in diameter with a 0.18" pixel scale.
H and Ks-band data of the central region of N79 were obtained on 2018
August 6 and October 23 with Gemini's GSAOI imager fed by the GeMS
Multiconjugate Adaptive Optics system under program GS-2018B-Q-202, PI
M. Andersen. The field of view of GSAOI is 85x85" with a pixel scale
of 20mas.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 52 965 Sources identified within the GSAOI field with
photometric errors below 0.1mag
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See also:
J/ApJ/707/1347 : HST F160W photometry in RMC 136 (Andersen+, 2009)
J/ApJS/184/172 : High and intermediate-mass YSOs in the LMC (Gruendl+, 2009)
J/AJ/146/62 : HERschel HERITAGE in Magellanic Clouds (Meixner+, 2013)
J/AJ/148/124 : Herschel key program Heritage (Seale+, 2014)
J/A+A/578/A4 : Photometry and motions in Arches & Quintuplet (Stolte+, 2015)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [0/964] Sequential source ID
5- 13 F9.6 deg RAdeg [72.9/73.1] Degree of Right Ascension, (J2000)
15- 24 F10.6 deg DEdeg [-69.5/-69.3] Degree of Declination (J2000)
26- 30 F5.2 mag Hmag [13.6/21.6] H-band magnitude
32- 35 F4.2 mag e_Hmag [0/0.1] Uncertainty in Hmag
37- 41 F5.2 mag Ksmag [12.7/20.9] Ks-band magnitude
43- 46 F4.2 mag e_Ksmag [0/0.1] Uncertainty in Ksmag
48- 52 A5 --- Instr Instrument; F2 or GSAOI
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 04-Aug-2021