THE NATURE OF THE STRONG 24 {mu}m SPITZER SOURCE J222557+601148: NOT A YOUNG GALACTIC SUPERNOVA REMNANT

Journal Article · Tue Jun 15 04:00:00 EDT 2010 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.1088/0004-6256/139/6/2595· OSTI ID:21443065

Fesen, Robert A; Milisavljevic, Dan ^[1]

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1. 6127 Wilder Lab, Department of Physics and Astronomy, Dartmouth College, Hanover, NH 03755 (United States)

The nebula J222557+601148, tentatively identified by Morris et al. as a young Galactic supernova remnant (SNR) from Spitzer Galactic First Look Survey images and a follow-up mid-infrared spectrum, is unlikely to be an SNR remnant based on H{alpha}, [O III], [S II] images, and low-dispersion optical spectra. The object is seen in H{alpha} and [O III] {lambda}5007 images as a faint, roughly circular ring nebula with dimensions matching that seen in 24 {mu}m Spitzer images. Low-dispersion optical spectra show it to have narrow H{alpha} and [N II] {lambda}{lambda}6548,6583 line emissions with no evidence of broad or high-velocity (v {>=} 300 km s{sup -1}) line emissions. The absence of any high-velocity optical features, the presence of relatively strong [N II] emissions, the lack of detected [S II] emission which would indicate the presence of shock-heated gas, plus no coincident X-ray or nonthermal radio emissions indicate that the nebula is unlikely to be an SNR, young or old. Instead, it is likely a faint, high-excitation planetary nebula (PN) as its elliptical morphology would suggest, lying at a distance {approx}2-3 kpc with unusual but not extraordinary mid-IR colors and spectra. We have identified an m{sub r'} = 22.4 {+-} 0.2 star as a PN central star candidate.

• OSTI ID: 21443065
• Journal Information: Astronomical Journal (New York, N.Y. Online), Journal Name: Astronomical Journal (New York, N.Y. Online) Journal Issue: 6 Vol. 139; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COSMIC RADIO SOURCES
DISTANCE
ELECTROMAGNETIC RADIATION
EMISSION
IMAGES
INFRARED SPECTRA
IONIZING RADIATIONS
MORPHOLOGY
NEBULAE
PLANETARY NEBULAE
RADIATIONS
SPECTRA
STARS
SUPERNOVA REMNANTS
VELOCITY
X RADIATION