J/MNRAS/452/1523 New young stellar cluster towards IRAS 04186+5143 (Yun+, 2015) ================================================================================ Not a galaxy: IRAS 04186+5143, a new young stellar cluster in the outer Galaxy. Yun J.L., Elia D., Djupvik A.A., Torrelles J.M., Molinari S. =2015MNRAS.452.1523Y (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: YSOs ; Infrared sources ; Photometry, infrared ; Photometry, millimetric/submm Keywords: stars: formation - ISM: clouds - dust, extinction - ISM: individual objects: IRAS 04186+5143 - infrared: stars - submillimetre: ISM Abstract: We report the discovery of a new young stellar cluster in the outer Galaxy located at the position of an IRAS Point Source Catalog source that has been previously misidentified as an external galaxy. The cluster is seen in our near-infrared imaging towards IRAS 04186+5143 and in archive Spitzer images confirming the young stellar nature of the sources detected. There is also evidence of subclustering seen in the spatial distributions of young stars and of gas and dust. Near- and mid-infrared photometry indicates that the stars exhibit colours compatible with reddening by interstellar and circumstellar dust and are likely to be low- and intermediate-mass young stellar objects (YSOs) with a large proportion of Class I YSOs. Ammonia and CO lines were detected, with the CO emission well centred near the position of the richest part of the cluster. The velocity of the CO and NH3 lines indicates that the gas is Galactic and located at a distance of about 5.5kpc, in the outer Galaxy. Herschel data of this region characterize the dust environment of this molecular cloud core where the young cluster is embedded. We derive masses, luminosities, and temperatures of the molecular clumps where the young stars reside and discuss their evolutionary stages. Description: Near-IR (J, H, and KS) images were obtained on 2009 September 8 using the Nordic Optical Telescope near-IR Camera and Spectrograph (NOTCam). The region around the position of the IRAS source was mapped using the single-dish Onsala Space Observatory (OSO) 20-m radio telescope (Onsala, Sweden) in 2009 April. Three maps were obtained in the rotational lines of ^12^CO(1-0), ^13^CO(1-0), and CS(2-1) at 115.271, 110.201, and 97.981GHz, respectively. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 39 784 NOT sources towards IRAS 04186+5143 table2.dat 95 363 Photometric data of Spitzer sources towards IRAS 04186+5143 having NOTCam counterparts -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 3 I3 --- ID Sequential number, within the table 5- 12 F8.5 deg RAdeg Right ascension (J2000) 14- 21 F8.5 deg DEdeg Declination (J2000) 23- 27 F5.2 mag Jmag ?=- J magnitude 29- 33 F5.2 mag Hmag ?=- H magnitude 35- 39 F5.2 mag Ksmag ?=- Ks magnitude -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 3 I3 --- ID Sequential number, within the table 5- 12 F8.5 deg RAdeg Right ascension (J2000) 14- 21 F8.5 deg DEdeg Declination (J2000) 23- 27 F5.2 mag Jmag ?=- J magnitude 29- 33 F5.2 mag Hmag ?=- H magnitude 35- 39 F5.2 mag Ksmag ?=- Ks magnitude 41- 49 E9.4 Jy F[3.6] ?=- IRAC flux at 3.6um 51- 59 E9.4 Jy F[4.5] ?=- IRAC flux at 4.5um 61- 69 E9.4 Jy F[5.8] ?=- IRAC flux at 5.8um 71- 79 E9.4 Jy F[8.0] ?=- IRAC flux at 8.0um 81- 85 F5.2 mag [3.6]-[4.5] ?=- IRAC colour index [3.6]-[4.5] 87- 91 F5.2 mag [5.8]-[8.0] ?=- IRAC colour index [5.8]-[8.0] 93- 95 A3 --- Class YSO class -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Patricia Vannier [CDS] 29-Jan-2016