ARG00000de LARGE CONTOUR & SMALL RADIO CONTOUR FROM 2 GALAXIES?
-
by
A1001
z 0.080 SOUTH SDSS J171223.15+640157.0 & z 0. 083 NORTH SDSS J171219.32+640208
Posted
-
by
JeanTate
Very cool, A1001! 😃
The E radio source (zsp 0.080 SDSS J171223.15+640157.0, left) and the W one (zph 0.10, but likely very similar SDSS J171216.19+640212.3, right) both have fracDeV values consistent with them being disk-dominated galaxies. Making the former an #SDRAGN candidate! 😄
Posted
-
by
Dolorous_Edd
same as ARG00000dl ARG00000df
Frankly, both of them look like typical E0 galaxies
Posted
-
by
JeanTate
in response to Dolorous_Edd's comment.
Frankly, both of them look like typical E0 galaxies
They certainly do, no doubt about that ... except that for me they didn't, esp the one on the right, so I checked fracDeV. From my GZ experience, a value <~0.5 almost always points to a disk, but one >0.5 does not mean 'no disk' (there are some pretty dramatic galaxies with obvious spiral structure that have fracDeV ~1! 😮). Of course, 2D profile fitting (e.g. with GALFIT) may show these are not disk-dominated galaxies at all. I'll see if either are in either Meert+ or Simiard+ ...
Posted
-
by
JeanTate
Only the first one (SDSS J171223.15+640157.0, left) is in both Simard and Meert (no surprise; both catalogs examine only DR7 objects with spectra); the second is in neither. And they give quite conflicting results! 😮
First, SDSS fracDeV_r is 0 for this galaxy. What you'd expect for a disk-dominated galaxy.
Second, Meert gives r-band BT (bulge-to-total luminosity ratio) as 0.519, with a Sersic n of 2.54±0.19 as the best fitting model ("Ser+Exp", Sersic bulge, exponential disk). No warning flags on the fit. It also says the GZ morphology is UNCERTAIN.
Third, Simard gives an r-band (B/T)r (r-band bulge-to-total ratio) of 1.±0., with an n of 5.72±0.12.
Don't you just love astronomy! 😉
Posted