J/MNRAS/380/1497 JHKs & GLIMPSE photometry towards G305.2+0.2 (Longmore+, 2007)
Embedded stellar populations towards young massive star formation regions.
I. G305.2+0.2.
Longmore S.N., Maercker M., Ramstedt S., Burton M.G.
<Mon. Not. R. Astron. Soc., 380, 1497-1510 (2007)>
=2007MNRAS.380.1497L 2007MNRAS.380.1497L
ADC_Keywords: H II regions ; Photometry, infrared
Keywords: stars: early-type - stars: evolution - stars: formation -
stars: pre-main-sequence - open clusters and associations: general -
infrared: stars
Abstract:
We present deep, wide field J, H and Ks images taken with Infrared
Imager and Spectrometer 2 (IRIS2) on the Anglo-Australian Telescope,
towards the massive star formation region G305.2+0.2. Combined with
3.6, 4.5, 5.8 and 8.0um data from the Galactic Legacy Infrared
Mid-Plane Survey Extraordinaire (GLIMPSE) survey on the Spitzer Space
Telescope, we investigate the properties of the embedded stellar
populations. After removing contamination from foreground stars,
we separate the sources based on their infrared (IR) colour. Strong
extended emission in the GLIMPSE images hampers investigation of
the most embedded sources towards the known sites of massive star
formation. However, we find a sizeable population of IR excess sources
in the surrounding region free from these completeness effects.
Investigation reveals the recent star formation activity in the
region is more widespread than previously known.
Description:
The J-, H- and Ks-band (1.2, 1.6 and 2.2um) images were observed
using IRIS2 (Infrared Imager and Spectrometer 2) on the 3.9-m
Anglo-Australian Telescope (AAT) at Siding Spring Observatory.
The Ks-band observations were taken on 2002 July 25 and the J/H
band observations were carried out on 2006 May 16-17 with seeing
of 1-1.2arcsec. For each source, a 3x3 image grid was created with
∼1arcmin offsets from the pointing centre. The integration time at
each of the nine grid points was around 1min with 3x20s, 6x10s and
9x6s exposures at J, H and Ks, respectively.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 136 7282 *IRIS2-GLIMPSE catalog of sources in G305.2+0.2
--------------------------------------------------------------------------------
Note on table1.dat: Sources identified as [LMR2007] DDD.dddd+DD.dddd in Simbad.
--------------------------------------------------------------------------------
See also:
http://www.astro.wisc.edu/glimpse/glimpsedata.html : GLIMPSE Home Page
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.4 deg RAdeg Right Ascension (J2000)
10- 17 F8.4 deg DEdeg Declination (J2000)
20- 25 F6.3 mag Jmag ?=- J magnitude from IRIS-2
27- 31 F5.3 mag e_Jmag ?=- J magnitude error
33- 37 I5 --- JID ?=- ID number of the IRIS-2 source
40- 45 F6.3 mag Hmag ?=- H magnitude from IRIS-2
47- 51 F5.3 mag e_Hmag ?=- H magnitude error
53- 57 I5 --- HID ?=- ID number of the IRIS-2 source
60- 65 F6.3 mag Ksmag ?=- Ks magnitude from IRIS-2
67- 71 F5.3 mag e_Ksmag ?=- Ks magnitude error
73- 77 I5 --- KsID ?=- ID number of the IRIS-2 source
80- 85 F6.3 mag 3.6mag ?=- GLIMPSE magnitude at 3.6µm
87- 91 F5.3 mag e_3.6mag ?=- Mean error on 3.6mag
93- 98 F6.3 mag 4.5mag ?=- GLIMPSE magnitude at 4.5µm
100-104 F5.3 mag e_4.5mag ?=- Mean error on 4.5mag
106-111 F6.3 mag 5.8mag ?=- GLIMPSE magnitude at 5.8µm
113-117 F5.3 mag e_5.8mag ?=- Mean error on 5.8mag
119-124 F6.3 mag 8.0mag ?=- GLIMPSE magnitude at 8.0µm
126-130 F5.3 mag e_8.0mag ?=- Mean error on 8.0mag
133-136 I4 --- GLIMPSE Glimpse identification
--------------------------------------------------------------------------------
Acknowledgements:
Steve Longmore, slongmore(at)cfa.harvard.edu
(End) Patricia Vannier [CDS] 21-Jan-2008