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Terzan 7

Field	Value
name	Terzan 7
image	[[Image:It came from outer space.jpg	250px]]
caption	Terzan7 by Hubble Space Telescope; 3.5 view
epoch	J2000
constellation	Sagittarius
ra
dec
dist_ly	75.7 kly{{citation
title	Terzan 7 @ seds
url	http://www.seds.org/~spider/spider/MWGC/ter07.html
url-status	dead
archiveurl	https://web.archive.org/web/20021024065203/http://www.seds.org/~spider/spider/MWGC/ter07.html
archivedate	2002-10-24
appmag_v	12.0
size_v	7.3
radius_ly	160 ly
v_hb	17.76{{citation
last1	Wilson
first1	Barbara
date	July 2, 1995
title	Obscure Globulars
url	http://www.astronomy-mall.com/Adventures.In.Deep.Space/obscure.htm
age	7.5 Gyr{{citation
last1	Geisler
first1	Doug
last2	Wallerstein
first2	George
last3	Smith
first3	Verne V.
last4	Casetti-Dinescu
first4	Dana I.
title	Chemical Abundances and Kinematics in Globular Clusters and Local Group Dwarf Galaxies and Their Implications for Formation Theories of the Galactic Halo
date	September 2007
journal	The Publications of the Astronomical Society of the Pacific
volume	119
issue	859
pages	939–961
bibcode	2007PASP..119..939G
doi	10.1086/521990
arxiv	0708.0570	s2cid = 119599242
notes	young extragalactic globular
names	Ter 7, GCl 109.1

|url-status = dead

Terzan 7 is a sparse and young globular cluster that is believed to have originated in the Sagittarius Dwarf Spheroidal Galaxy (Sag DEG) and is physically associated with it. It is relatively metal rich with {{citation | editor1-first = D. | editor2-last = Grebel | editor2-first = E.K. | editor3-last = Minniti | editor3-first = D. | publication-date = 2002 | publication-place = San Francisco | editor-last = Geisler

History

Terzan 7 was the brightest of six globulars discovered by Turkish-Armenian{{citation

Young globular

Nearly all globular clusters of the Milky Way's galactic halo formed at the same time (12-15 Gyr). Even the far situated NGC 2419 (~100 kpc from Galactic Center) has a similar age. This trend also applies to the age of globulars found in the Large Magellanic Cloud and Fornax Dwarf (~140 kpc from Galactic Center). However, a few globulars seem to be significantly younger than the rest; these include Palomar 1, Palomar 3, Palomar 4, Palomar 12, Palomar 14, Ruprecht 106, IC 4499, Arp 2, Eridanus, Fornax 4, and Terzan 7. In particular, the ones associated with the Sag DEG appear to have formed more recently. The data suggests that all the present outer halo globulars may have originally formed in dwarf spheroidals.

Hierarchical galaxy formation

Alternatively, a hierarchical galaxy formation model is hypothesized under which a portion, possibly large, of the Milky Way's globular clusters would have originated in the accretion of other dwarf spheroidals like Sag DEG. The best candidate for this idea is Palomar 12.{{citation

Notes

75.7 kly × tan( 7.3 / 2 ) = 160 ly. radius

References

(December 2010). "The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters". The Astronomical Journal.
"Cl Terzan 7".

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globular-clusters sagittarius-dwarf-spheroidal-galaxy sagittarius-(constellation) astronomical-objects-discovered-in-1968

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