Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7230s&link_type=abstract
HST Proposal ID #7230
Physics
Hst Proposal Id #7230 Galaxies
Scientific paper
NGC 4258 is a nearby spiral galaxy {6.4 Mpc, 0.15" corresponds to 5 pc} in which VLBI measurements of H2O masers have shown strong evidence of an accretion disk surrounding a black-hole of mass 3.6x10**7 Msun {Miyoshi et 1995}. The spin axis is at 119 deg to that of the host spiral, but nearly parallel to jets seen in H-alpha and the radio continuum. Although the maser emission is seen only out to radii of 7 milliarcsec, the disk may well extend further {the lack of maser emission at larger radii probably being due to dissociation of the molecules, insufficient excitation and/or gain}. The nucleus of this galaxy will be imaged in the broadband filters and P-alpha to search for evidence of the outer accretion disk and to image the ionized gas jets. Ground based imaging of NGC 4418 strongly suggests the prescence of a dust-enshrouded quasar-like nucleus. In this galaxy, we will do high resolution broadband imaging to measure the size of the nucleus and search for an inner accretion disk. {Timing is such that no parallels should be done with WFPC2 or STIS.}
No associations
LandOfFree
Dust Embedded Blackholes/agn in Nearby Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Dust Embedded Blackholes/agn in Nearby Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dust Embedded Blackholes/agn in Nearby Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-895238