skip to main content

SciTech ConnectSciTech Connect

Title: An X-ray and infrared survey of the Lynds 1228 cloud core

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.
Authors:
 [1] ;  [2] ;  [3]
  1. CASA, University of Colorado, Boulder, CO 80309-0389 (United States)
  2. Spitzer Science Center/Caltech, M/S 220-6, 1200 East California Blvd., Pasadena, CA 91125 (United States)
  3. Department of Astrophysics, University of Vienna, Türkenschanzstr. 17, A-1180 Vienna (Austria)
Publication Date:
OSTI Identifier:
22340302
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 147; Journal Issue: 4; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COLOR; DISTANCE; EMISSION; ENERGY SPECTRA; HARD X RADIATION; HERBIG-HARO OBJECTS; INFRARED SURVEYS; PHOTOMETRY; PROTOSTARS; SIMULATION; SPACE; STARS; TELESCOPES; X-RAY SOURCES