Wang, Yuan, Audard, Marc ORCID: 0000-0003-4721-034X, Fontani, Francesco ORCID: 0000-0003-0348-3418, Sanchez-Monge, Alvaro, Busquet, Gemma, Palau, Aina ORCID: 0000-0002-9569-9234, Beuther, Henrik, Tan, Jonathan C., Estalella, Robert ORCID: 0000-0001-7341-8641, Isella, Andrea, Gueth, Frederic and Jimenez-Serra, Izaskun ORCID: 0000-0003-4493-8714 (2016). Ongoing star formation in the protocluster IRAS 22134+5834. Astron. Astrophys., 587. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Aims. Massive stars form in clusters, and their influence on nearby starless cores is still poorly understood. The protocluster associated with IRAS 22134+5834 represents an excellent laboratory for studying the influence of massive YSOs on nearby starless cores and the possible implications in the clustered star formation process. Methods. IRAS 22134+5834 was observed in the cm range with (E)VLA, 3 mm with CARMA, 2 mm with PdBI, and 1.3 mm with SMA, to study both the continuum emission and the molecular lines that trace different physical conditions of the gas. Results. The multiwavelength centimeter continuum observations revealed two radio sources within the cluster, VLA1 and VLA2. VLA1 is considered to be an optically thin UCHII region with a size of 0.01 pc that sits at the edge of the near-infrared (NIR) cluster. The flux of ionizing photons of the VLA1 corresponds to a B1 ZAMS star. VLA2 is associated with an infrared point source and has a negative spectral index. We resolved six millimeter continuum cores at 2 mm, MM2 is associated with the UCHII region VLA1, and other dense cores are distributed around the UCHII region. Two high-mass starless clumps (HMSC), HMSC-E (east) and HMSC-W (west), are detected around the NIR cluster with N2H+ (1-0) and NH3 emission, and they show different physical and chemical properties. Two N2D+ cores are detected on an NH3 filament close to the UCHII region with a projected separation of similar to 8000 AU at the assumed distance of 2.6 kpc. The kinematic properties of the molecular line emission confirm that the UCHII region is expanding and that the molecular cloud around the NIR cluster is also expanding. Conclusions. Our multiwavelength study has revealed different generations of star formation in IRAS 22134+5834. The formed intermediate-to-massive stars show a strong impact on nearby starless clumps. We propose that the starless clumps and HMPOs formed at the edge of the cluster while the stellar wind from the UCHII region and the NIR cluster drives the large scale bubble.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Wang, YuanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Audard, MarcUNSPECIFIEDorcid.org/0000-0003-4721-034XUNSPECIFIED
Fontani, FrancescoUNSPECIFIEDorcid.org/0000-0003-0348-3418UNSPECIFIED
Sanchez-Monge, AlvaroUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Busquet, GemmaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Palau, AinaUNSPECIFIEDorcid.org/0000-0002-9569-9234UNSPECIFIED
Beuther, HenrikUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tan, Jonathan C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Estalella, RobertUNSPECIFIEDorcid.org/0000-0001-7341-8641UNSPECIFIED
Isella, AndreaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gueth, FredericUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jimenez-Serra, IzaskunUNSPECIFIEDorcid.org/0000-0003-4493-8714UNSPECIFIED
URN: urn:nbn:de:hbz:38-283601
DOI: 10.1051/0004-6361/201526637
Journal or Publication Title: Astron. Astrophys.
Volume: 587
Date: 2016
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 1432-0746
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
MASS PROTOSTELLAR CANDIDATES; YOUNG STELLAR OBJECTS; CO LINE FORMATION; DENSE CORES; MOLECULAR CLOUDS; INITIAL CONDITIONS; EVOLUTIONARY TRACER; COLOGNE DATABASE; ABUNDANCE RATIO; FORMING REGIONSMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/28360

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