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J/AJ/144/101 Multiwavelength data of IRAS 20050+2720 young SFR (Guenther+, 2012)
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Beginning of ReadMe :J/AJ/144/101 Multiwavelength data of IRAS 20050+2720 young SFR (Guenther+, 2012)
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IRAS 20050+2720: anatomy of a young stellar cluster.
Guenther H.M., Wolk S.J., Spitzbart B., Gutermuth R.A., Forbrich J.,
Wright N.J., Allen L., Bourke T.L., Megeath S.T., Pipher J.L.
<Astron. J., 144, 101 (2012)>
=2012AJ....144..101G (SIMBAD/NED BibCode)
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ADC_Keywords: X-ray sources ; Stars, pre-main sequence ; Associations, stellar ;
YSOs ; Photometry, UBVRI ; Photometry, infrared ; Extinction
Keywords: circumstellar matter - infrared: stars - stars: formation -
stars: pre-main sequence - X-rays: stars
Abstract:
IRAS 20050+2720 is young star-forming region at a distance of 700pc
without apparent high-mass stars. We present results of our
multi-wavelength study of IRAS 20050+2720 which includes observations
by Chandra and Spitzer, and Two Micron All Sky Survey and UBVRI
photometry. In total, about 300 young stellar objects (YSOs) in
different evolutionary stages are found. We characterize the
distribution of YSOs in this region using a minimum spanning tree
analysis. We newly identify a second cluster core, which consists
mostly of class II objects, about 10' from the center of the cloud.
YSOs of earlier evolutionary stages are more clustered than more
evolved objects. The X-ray luminosity function (XLF) of IRAS
20050+2720 is roughly lognormal, but steeper than the XLF of the more
massive Orion Nebula complex. IRAS 20050+2720 shows a lower N_H_/A_K_
ratio compared with the diffuse interstellar medium.
Description:
We use Spitzer data from two initial observations performed in 2004,
which are described in detail in Gutermuth et al. (2009, Cat.
J/ApJS/184/18). This data set misses an extended population beyond the
cluster core, so follow-up observations were performed in 2007 as part
of the Spitzer "Clusters Near Clusters" GTO program (Program ID 40147;
Masiunas et al., 2012ApJ...752..127M).
On 2004 Jun 9, the cluster center was imaged with IRAC (3.6-8.0mum,
AORKEY 3656448). In 2007 Jun 29, two additional maps were obtained
with IRAC to the northeast and southwest of the original pointing
(AORKEY 21893120 and AORKEY 21893376).
MIPS mosaics (24-160mum) were taken at medium scan rate with
full-width scan stepping. The observation in 2004 Sep 25 (AORKEY
3665152) contains three scanning stripes, one stripe toward the
southeast was added in 2007 Oct 27 (AORKEY 21891840). Because of the
low angular resolution, the 70 and 160mum data cannot be used for
individual sources in a dense region like IRAS 20050+2720.
IRAS 20050+2720 was observed with Chandra using the VFAINT mode of the
ACIS-I detector in three different epochs (2006 Dec 10, ObsID 6438;
2006 Jan 7, ObsID 7254; and 2007 Jan 29, ObsID 8492).
Optical photometry of IRAS 20050+2720 was obtained on 2009 Nov 18 and
2009 Nov 21 at the Fred Lawrence Whipple Observatory (FLWO) with the
1.2m telescope and the Keplercam instrument. Keplercam is a camera
with a Fairchild "CCD 486" detector. We use observations taken in
u'B_H_V_H_r'i'. The B_H_ and V_H_ filters belong to the Harris set,
the u', r', and i' filters are part of a Sloan Digital Sky Survey
(SDSS) set (Fukugita et al., 1996AJ....111.1748F). The optical
photometry is supplemented by data from IPHAS, the Isaac Newton
Telescope (INT) Photometric Halpha Survey (Drew et al.,
2005MNRAS.362..753D). IPHAS is a survey of the northern Galactic plane
in broad band r', i', and narrowband Halpha filters to a depth of
r' 20(10sigma). Using the IPHAS Initial Data Release
(Gonzalez-Solares et al., 2008MNRAS.388...89G) we extracted all
stellar sources (morphological classification=-1) within 15' of the
center of IRAS 20050+2720.