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GGD 27: X-rays from a Massive Protostar with an Outflow

Pravdo, Steven H. and Tsuboi, Yohko and Suzuki, Yuchiro and Thompson, Timothy J. and Rebull, Luisa (2009) GGD 27: X-rays from a Massive Protostar with an Outflow. Astrophysical Journal, 690 (1). pp. 850-861. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:PRAapj09

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Abstract

We report the discovery of a cluster of Class I protostars in GGD 27. One of these protostars is the previously known, centrally located, GGD 27-ILL, which powers a massive bipolar outflow. We show that GGD 27-ILL, which is known to be the bright infrared (IR) source, IRAS 18162-2048, and a compact radio continuum source, is also the newly discovered hard X-ray source, GGD 27-X. The observations were made with the ACIS instrument on the Chandra X-ray Observatory. The X-rays from GGD 27-X are variable when compared with 4 years earlier, with an unabsorbed 2-10 keV X-ray luminosity in this observation of 1.5-12 × 10^31 erg s^–1 and a plasma temperature of ≥ 10^7 K. The X-rays are probably associated with the underlying B0 star (rather than outflowing material), providing a rare glimpse in hard X-rays of an optically obscured massive protostar with an outflow. The X-ray luminosity and spectrum appear to be consistent with stars of its type in other star formation regions. Several other variable X-ray sources are also detected in the IR cluster that contains GGD 27-X. We also discuss another nearby cluster. In each of the clusters there is an object that is X-ray hard, highly absorbed at low energies, in a blank optical/IR/radio field, and variable in X-ray intensity by a factor of ≥ 10 on a timescale of 4 years. These latter objects may arise from more recent episodes of star formation or may be "hidden" Class III sources.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/690/1/850DOIArticle
http://www.iop.org/EJ/abstract/0004-637X/690/1/850PublisherArticle
ORCID:
AuthorORCID
Rebull, Luisa0000-0001-6381-515X
Additional Information:Copyright 2008 California Institute of Technology. Received 2008 March 17, accepted for publication 2008 September 9. Published 2008 December 1. Print publication: Issue 1 (2009 January 1). The research described in this paper was performed in part by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. We thank K. Getman, A. Burrows, Y. Maeda, & M. Tamura for helpful discussions. This research has made use of the NASA/IPAC Infrared Science Archive including the Spitzer archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This research was supported by NASA contract NAS 8-01128. Government sponsorship acknowledged. Y.T. acknowledges support from the Grants-in-Aid for Scientific Research (number 20540237) by the Ministry of Education, Culture, Sports, Science and Technology. Copyright 2008 California Institute of Technology. Online-only material: color figures.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NASANAS 8-01128
National Science FoundationUNSPECIFIED
Ministry of Education, Culture, Sports, Science and Technology (Japan)20540237
Subject Keywords:infrared: stars – stars: pre-main sequence – X-rays: stars
Issue or Number:1
Record Number:CaltechAUTHORS:PRAapj09
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:PRAapj09
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12516
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:12 Dec 2008 03:52
Last Modified:03 Oct 2019 00:29

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