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Siena%20College%20Alfalfa%20Group

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Five of which form a subsystem at the center of the cluster with observed tidal ... (Needed more hugs?) NGC 3820 shows definite signs of tidal damage ... – PowerPoint PPT presentation

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Title: Siena%20College%20Alfalfa%20Group


1
Siena College Alfalfa Group
  • Bobby Carroll
  • Kristie Dangerfield
  • Kevin Risolo
  • Danielle Seeley
  • Patti Carroll
  • Rose Finn

2
MKW 10
  • MKW 10 A Group of Galaxies with a Compact Core-
    B. A. Williams
  • A poor cluster of galaxies (a small number of
    galaxies)
  • (Ironically) Nine galaxies (of mpg lt 15.5), with
    eight spiral members
  • Five of which form a subsystem at the center of
    the cluster with observed tidal interactions via
    their HI profiles
  • Embedded in a larger structure (3 degree
    diameter)
  • Central velocity 6040 km/s
  • Standard deviation of the members 150 km/s
  • Appears to be gravitationally bound

3
Disturbed Galaxies (Needed more hugs?)
  • NGC 3820 shows definite signs of tidal damage
  • It hydrogen content per luminosity is the lowest
    of late-type spirals in the group
  • Perhaps by NGC 3819?
  • NGC 3817 is the least asymmetric of the subsystem
  • But its Gaussian profile is unusual given its
    inclination of 45
  • Still appears as a perfect double peak
  • Galaxies outside the core appear unaffected by
    tidal interactions

4
Data Reduction Finding Sources
  • IDL to access the ALFALFA data
  • Used Gridview to identify sources both visually
    and via computer recognition of galaxy locations
    in the cube
  • Went into Galflux to find the half width, flux,
    and central velocity
  • Measurements are somewhat arbitrary, but more or
    less accurate
  • Put into our own catalogue

5
Gridview view
6
Sample Source
7
Comparison
  • Compared our catalogue to ALFALFA catalogue
  • Able to match most every radio source
  • However we did find a number of galaxies we had
    that the ALFALFA catalogue didnt have
  • We found all the galaxies they had
  • But not all their radio sources
  • Look into this further, see which ones are
    missing?
  • Are they of importance?

8
Comparison II
  • Took the ALFALFA catalogue and compared it to the
    SDSS
  • See which radio source galaxies have optical
    counterparts
  • And which optical galaxies have no radio
    counterpart

9
MKW 10 Group
N 3820
Zw 68-044
N 3819
N 3817
N 3825
N 3822
U 6647
Zw 68-046
N 3833
10
N 3820
11
N 3819
12
Rectangular Search
RA between 173.545 and 177.545 AND Dec between
8.306 and 12.306
RA
Dec
  • 61 Objects Found

redshift
13
Morphology
  • Based off the optical images observed
  • Found
  • 27 elliptical galaxies
  • 16 spiral galaxies
  • 4 barred spiral galaxies
  • 4 lenticular galaxies
  • 10 irregular galaxies

14
Master Catalog Goal merge radio and optical data
into one catalog Step1 -Radio
catalog - 163 detections after velocity cut -
77 detections within 4600-7600(km/s)
-match Radio to SDSS Spec catalog - 33 galaxies
-match Radio to SDSS Phot catalog - 8
galaxies (rlt18) Step 2 - no match with
SDSS add - 36 galaxies Step 3 -go
through SDSS Spec catalog if not match to HI add
- 39 galaxies
15
Position
16
Redshift
17
Color-Magnitude Diagram
18
HI Mass
19
Stellar Mass
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