The ChaMPlane survey is being conducted at the
Harvard-Smithsonian Center for Astrophysics.
GRO J0422+32 field
GRO J0422+32 is a Black Hole X-ray Nova (BHXN) discovered in outburst
by GRO/BATSE on 5 August 1992. Dynamical data establish that its
primary is a black hole with mass that likely exceeds ~ 9 M_solar
may be as high as ~ 28 M_solar.
Chandra observation of J0422+32 for 20 ksec was made on October 10,
2000 as part of a study of black hole event horizons (PI:
McClintock). 66 X-ray sources (0.5-7.0 keV) were detected on 5 ACIS
chips (I1-4 & S2), including J0422+32 which was placed at the telescope
aim point on ACIS-I3. Photometry of J0422+32 was done on December 5,
2000 using KPNO/Mosaic with V, R, I and H-alpha filters.
Following images show the ChaMPlane early results of the J0422_32 field.
ChaMPlane X-ray source positions (green circles) superimposed on
optical Mosaic image (stacked 10 dithered R images; total exposure
time: 2100 sec) of J0422+32 field (North-up, East-left). White
squares denote H-alpha
emission sources, 3 of which are Chandra sources. Large green squares
(8' x 8' each) are the Chandra ACIS overlay.
The same image as above but zoomed in by a factor of 2 centered
at the aimpoint of ACIS-I (small greem diamond at the center).
The same image as above but zoomed in by a another factor of 2.
J0422+32 is at the center of the green circle boxed by a white square
at the center of the image.