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

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 m pg < 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

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

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

Gridview…… view

Sample Source

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 didn’t 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?

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

MKW 10 Group N 3820 N 3819 Zw Zw N 3833 N 3825N 3822 N 3817 U 6647

N 3820

N 3819

Rectangular Search 61 Objects Found RA Dec redshift RA between and AND Dec between and

Morphology Based off the optical images observed Found: –27 elliptical galaxies –16 spiral galaxies –4 barred spiral galaxies –4 lenticular galaxies –10 irregular galaxies

Master Catalog Goal: merge radio and optical data into one catalog Step1: -Radio catalog detections after velocity cut - 77 detections within (km/s) -match Radio to SDSS Spec catalog - 33 galaxies -match Radio to SDSS Phot catalog - 8 galaxies (r<18) Step 2: - no match with SDSS add - 36 galaxies Step 3: -go through SDSS Spec catalog if not match to HI add - 39 galaxies

Position

Redshift

Color-Magnitude Diagram

HI Mass

Stellar Mass