You will be presented with the full text of a science research paper. Please write an abstract for this paper. Your response should include the abstract and no additional text.

Paper text:
lsb galaxies have diffuse stellar disks , large hi gas disks and low metallicities ( impey & bothun 1997 ) .
although rich in gas they are poor in star formation and appear less evolved compared to bright galaxies . their lack of evolution may be due to the presence of massive dark halos that inhibit the formation of disk instabilities such as bars and spiral arms , which can trigger star formation activity in galaxies .
active galactic nuclei ( agn ) have been detected at optical wavelengths in several bulge - dominated giant lsb galaxies ( sprayberry et al .
1993 ; schombert 1998 ) .
this is suprising as agn are generally associated with bright , star forming galaxies ( ho , philipenko & sargent 1997 ) .
not much is known about the radio continuum emission from lsb galaxies .
several giant lsb galaxies such as ugc  1922 are bright in the nvss vla survey at 1.4 ghz ( condon et al .
1998 ) , and a millimeter continuum source was detected in ugc  6614 .
these observations suggest that agn in giant lsbs have properties similar to those found in bright galaxies even though the galaxy evolutionary histories are very different .
and beam is  7 ; ( b )  ugc  1922 : contours levels are 12 , 14 , 16 , 18 , 20 , 22 , and 24  @xmath0 where @xmath1 and the beam is   24 ; ( c )  ugc  6614 : contours levels are 3 , 5 , 7 , 9 and 11  @xmath0 where @xmath2 and the beam is   15.,width=513,height=163 ]
this poster presents preliminary results of a larger study of giant lsb galaxies using the gmrt .
( i )  pgc  045080 is close to edge on and fairly distant ( @xmath3  ) .
early optical studies did not detect an agn in this galaxy ( sprayberry et al .
1993 ) but weak agn activity may be present ( das et al . 2007 ) .
the galaxy is poor in star formation , fairly isolated and has a lopsided , massive hi disk .
( ii )  ugc  1922 has a bright nucleus or bulge and a very low surface brightness disk .
it is also fairly distant ( @xmath4  ) .
it is one of the rare lsb galaxies that have been detected in co and there is a significant concentration of molecular gas in the galaxy nucleus ( oneil & schinnerer 2003 ) .
the galaxy hosts an agn that is visible in optical emission as well as radio continuum .
( iii )  ugc  6614 is a relatively nearby lsb galaxy ( @xmath5  ) .
it is close to face on , has a prominent bulge and fairly distinct spiral arms that extend well into the disk .
the agn is visible in optical emission and appears as a compact core in the nvss map and at millimeter wavelengths as well ( das et al .
we observed all three galaxies from august , 2005 to march , 2006 using the gmrt , which is an array of thirty radio antennas arranged in a compact core and y shaped configuration .
( i )  pgc  045080 was observed at 1.4  ghz , 610  mhz and 325  mhz ( das et al .
the emission is extended and at 610  mhz appears to have two lobes associated with the nucleus ( figure  1a ) .
the spectral index between 1.4  ghz and 325  mhz is @xmath6=-0.63 ( where @xmath7 ) .
( ii )  the continuum emission at 610  mhz in ugc  1922 is also extended and the peak is offset from the galaxy center by a few arcseconds ( figure  1b ) . the spectral index between 1.4  ghz and 610  mhz is 3 suggesting that it may be a giga - hertz peaked spectrum ( gps ) radio source .
( iii )  the 610  mhz continuum map of ugc  6614 reveals a radio jet that extends well into the disk ( figure  1c ) .
one side appears brighter than the other and may represent the nearer jet .
the core is bright and has a peak brightness of 3  mjy at 610  mhz .
the spectral index is flat above 1.4  ghz but at 610  mhz is -0.53 .
we have found extended radio continuum emission associated with agn activity in 3 giant lsb galaxies . in at least two cases
these represent radio jets / lobes .
thus though these galaxies are optically dim , their nuclei can host agn and associated energetic activities .
we thank the gmrt staff for help in the observations .
the gmrt is operated by the national center for radio astrophysics of the tata institute of fundamental research .
we have used an sdss image of pgc045080a and a 2mass image of ugc1922 .
we thank alice quillen for the r band image of ugc6614 . this work has made use of the nasa / ipac science archive .
we present preliminary results of a study of the low frequency radio continuum emission from the nuclei of giant low surface brightness ( lsb ) galaxies . 
 we have mapped the emission and searched for extended features such as radio lobes / jets associated with agn activity . 
 lsb galaxies are poor in star formation and generally less evolved compared to nearby bright spirals . 
 this paper presents low frequency observations of 3 galaxies ; pgc  045080 at 1.4 ghz , 610 mhz , 325mhz , ugc  1922 at 610 mhz and ugc  6614 at 610 mhz . 
 the observations were done with the gmrt . 
 radio cores as well as extended structures were detected and mapped in all three galaxies ; the extended emission may be assocated with jets / lobes associated with agn activity . 
 our results indicate that although these galaxies are optically dim , their nuclei can host agn that are bright in the radio domain .