* Astronomy

Members Login
Username 
 
Password 
    Remember Me  
Home -> Astronomy News -> Observations -> NGC 1023
Post Info TOPIC: NGC 1023
Blobrana


L

Posts: 131433
Date:
RE: NGC 1023
Permalink  
 

Title: The young nuclear stellar disc in the SB0 galaxy NGC 1023
Author: E. M. Corsini (1 and 2), L. Morelli (1 and 2), N. Pastorello (3), E. Dalla Bontą (1 and 2), A. Pizzella (1 and 2), E. Portaluri (2) ((1) Dipartimento di Fisica e Astronomia `G. Galilei', Universitą di Padova, (2) INAF-Osservatorio Astronomico di Padova, (3) Centre for Astrophysics and Supercomputing, Swinburne University of Technology)

Small kinematically-decoupled stellar discs with scalelengths of a few tens of parsec are known to reside in the centre of galaxies. Different mechanisms have been proposed to explain how they form, including gas dissipation and merging of globular clusters. Using archival Hubble Space Telescope imaging and ground-based integral-field spectroscopy, we investigated the structure and stellar populations of the nuclear stellar disc hosted in the interacting SB0 galaxy NGC 1023. The stars of the nuclear disc are remarkably younger and more metal rich with respect to the host bulge. These findings support a scenario in which the nuclear disc is the end result of star formation in metal enriched gas piled up in the galaxy centre. The gas can be of either internal or external origin, i.e. from either the main disc of NGC 1023 or the nearby satellite galaxy NGC 1023A. The dissipationless formation of the nuclear disc from already formed stars, through the migration and accretion of star clusters into the galactic centre is rejected.

Read more (522kb, PDF)



__________________
Blobrana


L

Posts: 131433
Date:
Arp 135
Permalink  
 

NGC 1023 (also Arp 135, MCG 6-6-73, UGC 2154 and PGC 10123) is a magnitude +10.35 barred spiral galaxy located 30 to 64 million light-years away in the constellation Perseus.

The galaxy was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflector at Windsor Road, Slough, Berkshire, on the 18th October 1786.

Position (J2000): R.A. 02h 40m 24.1s  |  Dec. +39° 03' 48"

NGC 1023 is a member of the NGC 1023 group of galaxies in the Local Supercluster. 
Read more

Spoiler



__________________
Blobrana


L

Posts: 131433
Date:
RE: NGC 1023
Permalink  
 

Title: The innermost region of the NGC 1023 Group: Insight into its evolution
Authors: D. Bettoni (1), L. M. Buson (1), P. Mazzei (1), G. Galletta (2) ((1) INAF - Osservatorio Astronomico di Padova, (2) Dipartimento di Fisica e Astronomia, Universita' di Padova)

The NGC 1023 group is one of the most studied nearby groups. We want to give an insight into the evolution of its innermost region by means of ultraviolet observations and proper models. We used the FUV and NUV GALEX archival data as well as a large set of SPH simulations with chemo-photometric implementation. From the UV observations we found that several, already known, dwarf galaxies very close to NGC 1023 are also detected in UV and two more objects (with no optical counterpart) can be added to the group. Using these data we construct exhaustive models to account for their formation. We find that the whole SED of NGC 1023 and its global properties are well matched by a simulation which provides a minor merger with a companion system 5 times less massive. The strong interaction phase started 7.7 Gyr ago and the final merger 1.8 Gyr ago.

Read more (7234kb, PDF)



__________________
Blobrana


L

Posts: 131433
Date:
NGC 1023 Group
Permalink  
 

Title: Dwarf Galaxies in the NGC 1023 Group
Authors: Neil Trentham, Brent Tully

We present a compilation of galaxies in the NGC 1023 Group, an accumulation of late-type galaxies at a distance of 10 Mpc. Members at high and intermediate luminosities were identified from their spectroscopic velocities. Members at low luminosities were identified from their morphologies on wide-field CCD images. The faint-end slope is in the range -1.27 < alpha < -1.12. There is evidence for two dwarf galaxy populations: one in the halo of NGC 1023 that is dominated by dwarf elliptical galaxies, and one in the infall region surrounding NGC 1023 that contains mainly dwarf irregular galaxies. Similar distinctive populations are observed in the Local Group.

Read more  (1035kb, PDF)

__________________
Blobrana


L

Posts: 131433
Date:
RE: NGC 1023
Permalink  
 

NGC1023D.gif
Date: 04:21 UT, 17 October 2008
Exposure: 2 minutes

__________________
Blobrana


L

Posts: 131433
Date:
Permalink  
 

NGC1023e1.jpg
Date: 5:06 UT, 15th October 2008
Exposure: 12 Seconds

__________________
Blobrana


L

Posts: 131433
Date:
Permalink  
 

A possible magnitude 14.5 supernova was discovered in the barred spiral galaxy NGC1023 in the constellation Perseus, on the 9th October, 2008.
If the supernova is confirmed in the local galaxy (5.94 mpc) then it may brighten to magnitude 10, becoming the brightest for several years.

Position(2000): RA 02 40 25.5, Dec +39 03 57.2

__________________
Blobrana


L

Posts: 131433
Date:
Permalink  
 

30504860.238c11.jpg

Date:     03:01 UT, 5th October
Exposure: 6 seconds

__________________
Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.
Home -> Astronomy News -> Observations -> NGC 1023


Create your own FREE Forum
Report Abuse 		Powered by ActiveBoard