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Topic: NGC 4258

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	MSN Encarta - Search Results - NGC 4258
		NGC 4258, also known as M 106, spiral galaxy in the constellation Canes Venaciti that is believed to be home to a massive fl hole, a region of...
		NGC 7027, planetary nebula about 3000 light-years from the earth in the constellation Cygnus.
		NGC 4261, also known as 3C270, elliptical galaxy in the constellation Virgo believed to be home to a super-massive fl hole, a region of space in...
	encarta.msn.com /NGC_4258.html (95 words)

	NRAO Press Release - 1/13/97 ( 13-Jan-1997)
		NGC 4258 is the galaxy in which a warped disk of water molecules was discovered in 1994.
		The new radio observations of NGC 4258 are the first to show the exact location of the core of an AGN, and thus the first to allow measurement of the offset between the core and the detected emission closest to it.
		The galaxy NGC 4258 also is known as Messier 106, and is visible in moderate-sized amateur telescopes in the nighttime winter sky of the northern hemisphere, near the Big Dipper.
	www.nrao.edu /pr/1997/mysteries (1090 words)

	Lista de los objetos de NGC (Site not responding. Last check: 2007-10-21)
		NGC 1073 - una galaxia espiral muy dévil en Cetus
		NGC 1275 - Perseus A, una galaxia peculiar en Perseus
		NGC 1569 - una galaxia irregular en Camelopardalis
	www.yotor.net /wiki/es/li/Lista%20de%20los%20objetos%20de%20NGC.htm (3610 words)

	Jahrbuch-CD der MPG 2003 - An X-ray view of the active nuc (Site not responding. Last check: 2007-10-21)
		XMM-Newton observed the Seyfert 1.9 galaxy NGC 4258 in December 2000.
		These results can be explained by the relatively low nuclear absorption of NGC 4258 (which is in the range expected for its intermediate Seyfert type) and some variability of the absorbing material.
		Reflection components as proposed to explain the large iron line EW of highly absorbed Seyfert 2 galaxies and/or variations in the accretion disk are however imposed by the time variability of the iron line flux.
	www.mpg.de /forschungsergebnisse/wissVeroeffentlichungen/archivListenJahrbuch/2002/26/publZIM163.html (262 words)

	The peculiar galaxy NGC 4258: A black hole candidate.
		The peculiar galaxy NGC 4258: A fl hole candidate.
		NGC 4258 is a nearby (D = 6.4 Mpc) active spiral galaxy with high luminosity H
		NGC 4258 is also well known for its anomalous arms, visible only in H
	www.atnf.csiro.au /people/bkoribal/min_lecture/node23.html (276 words)

	Astron. Astrophys. 352, 64-84 (1999)
		The source is located 18:002 east and 75:002 north of the nucleus of NGC 4258, and its position is marked with a cross in Figs.
		While the anomalous arms of NGC 4258 have a position angle close to that of the major axis of the galaxy, the plumes of NGC 253 are extended perpendicular to the major axis of the galaxy.
		In the case of NGC 253, NGC 3079 and NGC 4258 the geometrical interpretation of the measured emission components is relatively simple, thus allowing the determination of the electron density and mass of the thermal gas.
	aa.springer.de /papers/9352001/2300064/sc4.htm (4534 words)

	The Disk-Jet System in Heart of the Active Nucleus of NGC 4258 (Site not responding. Last check: 2007-10-21)
		A team of radio astronomers at the Harvard-Smithsonian Center for Astrophysics, the National Radio Astronomy Observatory, and the National Astronomical Observatory of Japan are investigating a nearby Seyfert galaxy, NGC 4258.
		It is important to note that these measurements are sufficient to estimate a "geometric" distance to NGC 4258, one that is completely independent of the traditional astronomical distance indicators and related calibrations.
		The bottom image is a large scale map of NGC 4258 at 20 cm wavelength and with arcsecond resolution.
	cfa-www.harvard.edu /cfa/hotimage/ngc4258.html (782 words)

	CO observations and a new interpretation of the anomalous arms of NGC 4258 (Site not responding. Last check: 2007-10-21)
		CO(1-0) and CS(3-2) toward the center of NGC 4528, we derive the physical conditions of the molecular gas along these arms and analyse in detail the dynamics of the gas.
		Contrary to previous interpretations, we suggest that the anomalous arms in NGC 4258 trace the gas flow due to a bar rather than being the manifestation of a jet.
		In the bar of NGC 4258 most of the gas is molecular, not atomic.
	iram.fr /IRAMFR/ARN/nov96/node12.html (423 words)

	NGC 4258
		The bright Sb spiral galaxy NGC 4258 (M106) shines at apparent magnitude 8.3 and is easily visible in small amateur telescopes (possibly even through all the “haze”).
		Following the spiral arms in the sense of rotation, and most conspicuous on images of NGC 4258, is the yellowish remnant of an older spiral arm.
		If the connection between the galaxy and the quasars is real, this could be convincing evidence that some quasars are indeed ejected from galaxies and could be a major breakdown in the theory for their acceptance at cosmological distances.
	www.weblore.com /richard/ngc_4258.htm (851 words)

	Astron. Astrophys. 352, 64-84 (1999)
		One half (15) of the sources in the field are detected within the optical extent of NGC 4258, while two sources (X6 and X26) are located close to the border of the optical extent of NGC 4258.
		The central 10 kpc (5:05) region of NGC 4258, corresponding to the bulge and inner disk of NGC 4258, is covered by extended emission structures on top of which several point sources are detected (cf.
		The X-ray emission components of NGC 4258 for different regions of the galaxy are summarized in Table 9.
	aa.springer.de /papers/9352001/2300064/sc3.htm (3534 words)

	Jahrbuch-CD der MPG 2003 - NGC 4258 : A jet-dominated low- (Site not responding. Last check: 2007-10-21)
		The observational data of NGC 4258 is extremely abundant, including water maser emission, putting very strict constraints to its theoretical models.
		Up until now there is no model which can explain such a steep spectrum, and we here propose a coupled jet plus accretion disk model for NGC 4258.
		The accretion disk is composed of an inner ADAF (or radiatively inefficient accretion flow) and an outer standard thin disk.
	www.mpg.de /forschungsergebnisse/wissVeroeffentlichungen/archivListenJahrbuch/2002/21/publZIM133.html (281 words)

	Maryam Modjaz (Site not responding. Last check: 2007-10-21)
		Abstract: NGC 4258 is a low luminosity Seyfert II galaxy in which water maser emission arises in a very thin accretion disk around a supermassive fl hole of 4 x 10^7 M_solar.
		The detected part of the molecular portion of the disk has an outer radius of about 0.3 pc and is nearly edge-on.
		At a distance of about 0.2 pc from the central fl hole, along the diameter perpendicular to the line of sight, the toroidal component of the B field is
	www.mpa-garching.mpg.de /~bh-grow/Program/Speakers/MaryamModjaz.html (156 words)

	NGC 5 Galaxy Nebula Sky Astronomy Photos Nebulae Star Photo (Site not responding. Last check: 2007-10-21)
		NGC 6559, East of the Lagoon, APD 02 05 20 ś, Sagittarius
		NGC 7027 in Infrared, APD 98 03 25
		NGC 253, Sculptor Galaxy, APD 98 12 09
	www.extra.hu /astro/ngc5t.htm (230 words)

	Warping modes in the maser disc of NGC 4258 (Site not responding. Last check: 2007-10-21)
		We examine the characteristics of warping modes in the maser disc at the centre of NGC 4258.
		We also find that the position-velocity diagram calculated for a disc with a warping perturbation pattern is consistent with the observed redward offset of the low-velocity maser features, if the maser emission arises from the upper-half part of the disc.
		Characteristics of warping modes in the maser disc of NGC 4258
	harmas.arc.hokkai-s-u.ac.jp /~okazaki/Papers/ngc4258/L3183-html/L3183-html.html (165 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		From the speed of the dust (900 km/sec) rotating around the galactic center, astronomers have calculated that the mass of the central gravitating body has a mass of almost 40 million solar masses, all within a radius of 0.13 parsec.
		James Moran of the Harvard-Smithsonian Center for Astrophysics, reporting the new results at the AAS meeting on behalf of his Japanese- American collaboration, believes that the profile of high-speed gas provides "compelling evidence" that the central object is a fl hole.
		The high-resolution pictures of the heart of NGC 4258 were made with the Very Long Baseline Array, a network of radio telescopes located from Hawaii to the Virgin Islands.
	www.seds.org /nodes/NODEv4n5-2.3.html (179 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		Hubble detected a 2.4-billion-solar-mass fl hole identified in the core of elliptical galaxy M87 in 1994, and later that year, astronomers using a radio telescope array to examine the dynamics of a thin, warped disk of molecules deep in the core of spiral galaxy NGC 4258, measured a 40- million-solar-mass fl hole.
		Definition of Terms NGC 3377, NGC 3379: These designations refer to the 3,377th and 3,379th objects, respectively, in the New General Catalogue of Nebulae and Clusters of Stars, compiled at the end of the nineteenth century by the Danish astronomer Johan L. Dreyer.
		The galaxy NGC 3516 is moving away from the earth, producing a slight red- shift in its emission.
	www.math.ucr.edu /home/baez/PUB/BlackHoles (20360 words)

	M 106 NGC 4258 (Site not responding. Last check: 2007-10-21)
		In an 8" telescope, the galaxy appears as a moderately bright, elongated patch of light with a brighter centre.
		The fainter galaxy tot he north-west of M 106 is the 12th magnitude NGC 4248.
		The are NGC 4232 (below) and NGC 4231.
	www.acad.carleton.edu /curricular/PHYS/Faculty/MClark/m106c.htm (150 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		The fl hole, and a 800 light-year-wide spiral-shaped disk of dust fueling it, are slightly offset from the center of their host galaxy, NGC 4261, located 100 million light-years away in the direction of the constellation Virgo.
		Prior to Hubble observations, astronomers did not think dust was common in elliptical galaxies like NGC 4261, which were thought to have stopped making stars long ago due to the absence of the requisite raw materials: interstellar gas and dust.
		Hubble detected a 2.4-billion-solar-mass fl hole was identified in the core of elliptical galaxy M87 in 1994, and later that year, astronomers using a radio telescope array to examine the dynamics of a thin, warped disk of molecules deep in the core of spiral galaxy NGC 4258 measured a 40-million-solar-mass fl hole.
	www.star.bris.ac.uk /outreach/gifs/ngc4261.txt.2 (1057 words)

	Event Horizon Volume 2 Issue 6 April 1995
		NGC 2683 - Located near the front paw of Ursa Major (technically located in Lynx), this bright nearly edge on spiral is an easy target in 6" scopes or larger.
		NGC 5128 is quite bright, visible in a 6x30 finder from here so you should be able to see it despite horizon dimming.
		NGC 3132 on the Vela-Antila border is a bright planetary with an 8th magnitude central star, while NGC 3201 about 8 degrees to the south is a nice globular that would be quite a challenge.
	www.amateurastronomy.org /EH/EHapr95.html (8118 words)

	Characteristics of warping modes in the maser disc of NGC 4258
		Note that the first and the third features are consistent with the observed spatial distribution of high-velocity maser components of NGC 4258 [compare Fig.
		Note also that the second feature is in agreement with the observed near-Keplerian velocity distribution of maser sources of NGC 4258.
		It is highly desirable to study if these mechanisms work for the particular case of NGC 4258.
	harmas.arc.hokkai-s-u.ac.jp /~okazaki/Papers/ngc4258/L3183-html/node3.html (918 words)

	[No title]
		A model is developed for the H_2O maser source observed in the circumnuclear region of the galaxy NGC 4258.
		Using a sample of Chandra HETG AGN observations, including MCG-5-23-16 and NGC 4151, we show that the detection of a narrow component of the Fe K line is common.
		Using a sample of Chandra HETG AGN observations, including NGC 4151, we show that the detection of a narrow, probably non-disk, component of the iron line is very common.
	www.pha.jhu.edu /groups/astro/workshop2001/abstracts.html (8866 words)

	Why Does NGC 1068 Have a More Powerful Active Galactic Nucleus than NGC 4258 ? (Site not responding. Last check: 2007-10-21)
		The nuclear gas kinematics probed by water vapor maser emission has shown that two nearby active galaxies, NGC 1068 and NGC 4258, have a supermassive object in their nuclei and their masses are nearly comparable; a few 10$^7$ solar masses.
		Nevertheless, the activity of the central engine of NGC 1068 is more powerful by two orders of magnitude than that of NGC 4258.
		Comparing the kinematical properties of the accreting molecular clouds between NGC 1068 and NGC 4258, we find possible evidence for dynamical gas accretion in NGC 1068, which may be responsible for the more powerful central engine in this galaxy.
	galaxy.astr.tohoku.ac.jp /prepri/N1068/n1068.html (200 words)

	Catalogue: J/A+A/268/419
		J/A+A/268/419 HII Regions in NGC 4258 (Courtes+ 1993) ================================================================================ Structure of the spiral arms of NGC 4258 in Halpha and at 2000Angstroems.
		Comparing previous image-tube plates, taken between 1961 and 1969, to the recent CCD data for NGC 4258, we obtain flux estimates of the HII region hosting the supernova first discovered in radio frequencies on 1983.
		As a result, the integrated magnitude is in fair agreement with the report by Wild (IAU Circ 3803, 1983) of a 17th mag object in the same location.
	cdsweb.u-strasbg.fr /cgi-bin/Cat?J/A%2bA/268/419 (590 words)

	Spiral Galaxy M106 (NGC 4258) (Site not responding. Last check: 2007-10-21)
		The bright spiral galaxy NGC 4258 (M106) in Ursa Major.
		This system is distinguished by "anomalous arms", better described perhaps as jets, seen curving outward through the disk in radio emission and optical emission lines.
		This pseudocolor rendition was made from a V-band CCD frame covering a region 9 arcminutes square, taken with the 1.1-meter Hall telescope of Lowell Observatory.
	www.astr.ua.edu /gifimages/m106v.html (86 words)

	UvA SCS - Publications (Site not responding. Last check: 2007-10-21)
		G.D. van Albada: Neutral hydrogen in NGC 4248, Astron.
		G.D. van Albada: The peculiar spiral galaxy NGC 4258, in D.E. Evans, editor, Photometry, kinematics and dynamics of galaxies, pp.
		G.D. van Albada: New high resolution radio observations of NGC 4258; Paper II: NGC 4258 as a spiral galaxy, Astron.
	www.science.uva.nl /research/pwrs/papers (11961 words)

	NGC (Site not responding. Last check: 2007-10-21)
		NGC 3627 which was in the same FOV at 64x.
		The core of NGC 5194 was round, pretty large, pretty bright and condensed with a distinctively brighter nucleus.
		Not well detached from the surrounding field and NGC 6756 is a half degree to the North in the same field at low power.
	delaneys.home.att.net /a/dso.html (14704 words)

	Messier Object 106
		Spiral Galaxy M106 (NGC 4258), type Sbp, in Canes Venatici
		The bright Sb spiral galaxy M106 is perhaps about 21 to 25 million light years distant.
		Observations of the Sub-Parsec Maser Disk in NGC 4258.
	www.seds.org /messier/m/m106.html (657 words)

	Radio Continuum Mapping of the Spiral Galaxy NGC 4258 (Site not responding. Last check: 2007-10-21)
		We have combined numerous, short radio continuum observations of the Seyfert 1 galaxy NGC 4258 (M 106) made at 20 and 6 cm with the Very Large Array (VLA) to produce deep radio maps at these frequencies.
		The present analysis is analogous to our recent work on NGC 6946 (Hyman et al.
		The maps we produce for NGC 4258 are of superior sensitivity (\sigma \simlt 0.02 mJy/beam at 6 cm) and spatial resolution (\sim 0.5" at 6 cm) to those previously published by other investigators (e.
	www.aas.org /publications/baas/v28n2/aas188/abs/S004006.html (245 words)

	Water Masers in NGC 4258: Saturation and GR. [astro-ph/0501 (Site not responding. Last check: 2007-10-21)
		Water Masers in NGC 4258: Saturation and GR.
		Talk about Water Masers in NGC 4258: Saturation and GR.
		Posted: Thu Jan 06, 2005 7:00 am Post subject: Water Masers in NGC 4258: Saturation and GR.
	www.xshocks.com /forums/water-masers-in-ngc-4258-saturation-and-gr-astro-ph-0501-vt19143.html (43 words)

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