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An X-Ray and Infrared Survey of the Lynds 1228 Cloud Core

Skinner, Stephen L. and Rebull, Luisa and Güdel, Manuel (2014) An X-Ray and Infrared Survey of the Lynds 1228 Cloud Core. Astronomical Journal, 147 (4). Art. No. 88. ISSN 0004-6256.

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The nearby Lynds 1228 (L1228) dark cloud at a distance of ~200 pc is known to harbor several young stars including the driving sources of the giant HH 199 and HH 200 Herbig–Haro (HH) outflows. L1228 has previously been studied at optical, infrared, and radio wavelengths but not in X-rays. We present results of a sensitive 37 ks Chandra ACIS-I X-ray observation of the L1228 core region. Chandra detected 60 X-ray sources, most of which are faint (<40 counts) and non-variable. Infrared counterparts were identified for 53 of the 60 X-ray sources using archival data from the Two Micron All-Sky Survey, the Spitzer Space Telescope, and the Wide-field Infrared Survey Explorer. Object classes were assigned using mid-IR colors for those objects with complete photometry, most of which were found to have colors consistent with extragalactic background sources. Seven young stellar object candidates were identified including the class I protostar HH 200-IRS which was detected as a faint hard X-ray source. No X-ray emission was detected from the luminous protostar HH 199-IRS. We summarize the X-ray and infrared properties of the detected sources and provide IR spectral energy distribution modeling of high-interest objects including the protostars driving the HH outflows.

Item Type:Article
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URLURL TypeDescription Paper
Rebull, Luisa0000-0001-6381-515X
Additional Information:© 2014 American Astronomical Society. Received 2013 November 1; accepted 2014 January 13; published 2014 March 14. The scientific results reported in this article are based in part on observations made by the Chandra X-ray Observatory. We thank Kimberly Sokal and Bryan Nagel for assistance with data reduction. This work is based in part on archival data obtained with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory (JPL), California Institute of Technology (Caltech) under a contract with NASA. This publication makes use of data products from the Wide-field Infrared Survey Explorer (WISE), which is a joint project of the University of California, Los Angeles, and JPL/Caltech, funded by NASA. This research has made use of data products from the Two Micron All-Sky Survey (2MASS), which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center (IPAC), funded by NASA and the National Science Foundation. These data were served by the NASA/IPAC Infrared Science Archive, which is operated by JPL/Caltech under contract with NASA.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:Herbig–Haro objects; ISM: clouds; stars: formation; X-rays: stars
Issue or Number:4
Record Number:CaltechAUTHORS:20140502-092820998
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Official Citation:An X-Ray and Infrared Survey of the Lynds 1228 Cloud Core Stephen L. Skinner et al. 2014 The Astronomical Journal 147 88
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45459
Deposited By: Jason Perez
Deposited On:05 May 2014 18:27
Last Modified:03 Oct 2019 06:31

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