Sign on

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· On-line Data
· References in the article
· Citations to the Article (329) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (1)
· NED Objects (1)
· Also-Read Articles (Reads History)
· HEP/Spires Information
·
· Translate This Page
Title:
HST FOS spectroscopy of M87: Evidence for a disk of ionized gas around a massive black hole
Authors:
Harms, Richard J.; Ford, Holland C.; Tsvetanov, Zlatan I.; Hartig, George F.; Dressel, Linda L.; Kriss, Gerard A.; Bohlin, Ralph; Davidsen, Arthur F.; Margon, Bruce; Kochhar, Ajay K.
Affiliation:
AA(Applied Research Corporation, Landover, MD, US), AB(Applied Research Corporation, Landover, MD, US), AC(Johns Hopkins Univ., Baltimore, MD, US), AD(Johns Hopkins Univ., Baltimore, MD, US), AE(Applied Research Corporation, Landover, MD, US), AF(Applied Research Corporation, Landover, MD, US), AG(Space Telescope Science Inst., Baltimore, MD, US), AH(Space Telescope Science Inst., Baltimore, MD, US), AI(University of Washington, Seattle, WA, US), AJ(University of Washington, Seattle, WA, US)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 435, no. 1, p. L35-L38 (ApJL Homepage)
Publication Date:
11/1994
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Accretion Disks, Active Galactic Nuclei, Black Holes (Astronomy), Emission Spectra, Galactic Rotation, Ionized Gases, Plasma Jets, Faint Object Camera, Hubble Space Telescope, Kepler Laws, Radial Velocity, Spectrographs
DOI:
10.1086/187588
Bibliographic Code:
1994ApJ...435L..35H

Abstract

Using the Faint Object Spectrograph (FOS) on the Hubble Space Telescope (HST) to observe the central region of M87, we have obtained spectra covering approximately 4600-6800 A at a spectral dispersion approximately 4.4 A per resolution element through the .26 sec diameter entrance aperture. One spectrum was obtained centered on the nucleus of M87 and two centered 0.25 sec off the nucleus at position angles of 21 deg and 201 deg, thus sampling the anticipated major axis of the disklike structure (described in a companion Letter) expected to lie approximately perpendicular to the axis of the M87 jet. Pointing errors for these observations are estimated to be less than 0.02 sec. Radial velocities of the ionized gas in the two positions 0.25 sec on either side of the nucleus are measured to be approx. equals +/- 500 km/s relative to the M87 systemic velocity. These observations plus emission-line spectra obtained at two additional locations near the nucleus show the ionized gas to be in Keplerian rotation about a mass M = (2.4 +/- 0.7) x 109 solar mass within the inner 0.25 sec of M87. Our results provide strong evidence for the presence of a supermassive nuclear black hole in M87.

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences



More Article Retrieval Options

HELP for Article Retrieval


Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)


Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints