SHIELD

The Survey of HI in Extremely Low-mass Dwarfs

EVLA OSRO Program 10B-187

John M. Cannon (PI, Macalester College)
Betsey Adams (Cornell University)
Andrew Dolphin (Raytheon)
Ed Elson (ICRAR/UWA)
Riccardo Giovanelli (Cornell University)
Martha Haynes (Cornell University)
Kristy McQuinn (University of Minnesota)
Jürgen Ott (National Radio Astronomy Observatory)
Amélie Saintonge (Max-Planck-Institute for Extraterrestrial Physics)
John J. Salzer (Indiana University)
Evan D. Skillman (University of Minnesota)
Clara M. Thomann (Macalester College)

Science Goals

What properties change between mini-halos, very low-mass dwarfs, and more massive systems?

What fraction of the mass in these low-mass systems is baryonic?

Is the characater of the star formation process different in very low-mass galaxies?

Use SHIELD results to constrain models of galaxy evolution

SHIELD ApJ Letters Manuscript

Expanded Very Large Array (EVLA) Data
3-color mosaic

H Alpha mosaic

Galaxy	B Configuration	C Configuration	D Configuration
AGC 110482	Block 1: Block 2: Acquired April 10, 2011	Data: Acquired October 19, 2010 Status: reduced and imaged Previews: HI Column Density vs. optical HI Isovelocity vs. optical Channel map, part 1 Channel map, part 2 HI Column Density vs. WIYN 3.5m R-band HI Isovelocity vs. WIYN 3.5m Hα	Data: Acquired October 28, 2011 Status: reductions in progress
AGC 111164	Block 1: Block 2:	Data: Acquired October 29, 2010 Status: reduced and imaged Note: NGC 784 in primary beam Previews: HI Column Density vs. optical (large) HI Isovelocity vs. optical (large) HI Column Density vs. optical (small) HI Isovelocity vs. optical (small) Channel map HI Isovelocity vs. optical (smoothed) HI Column Density vs. optical (smoothed) Channel map (smoothed) HI Column Density (smoothed) vs. WIYN 3.5m R-band HI Isovelocity (smoothed) vs. WIYN 3.5m Hα	Data: Acquired October 5, 2011 Status: reductions in progress
AGC 111946	Block 1: Block 2: Acquired May 1, 2011 Status: reductions in progress	Data: Acquired October 20, 2010 Status: reduced and imaged Previews: HI Column Density vs. optical HI Isovelocity vs. optical Channel map HI Column Density vs. WIYN 3.5m R-band HI Isovelocity vs. WIYN 3.5m Hα	Data: Acquired November 21, 2011 Status: reductions in progress
AGC 111977	Block 1: Block 2:	Data: Acquired November 4, 2010 Status: reduced and imaged Previews: HI Column Density vs. optical HI Isovelocity vs. optical Channel map HI Column Density vs. WIYN 3.5m R-band HI Isovelocity vs. WIYN 3.5m Hα	Data: Acquired October 11, 2011 Status: reductions in progress
AGC 112521	Block 1: Block 2:	Data: Acquired October 26, 2010 Status: reduced and imaged Previews: HI Column Density vs. optical HI Isovelocity vs. optical Channel map, part 1 Channel map, part 2 HI Column Density vs. WIYN 3.5m R-band HI Isovelocity vs. WIYN 3.5m Hα	Data: Acquired November 14, 2011 Status: reductions in progress
AGC 174585	Block 1: Acquired March 15, 2011 Status: reductions in progress Block 2: Acquired April 24, 2011 Status: reductions in progress	Data: Acquired November 4, 2010 Status: reduced and imaged Previews: HI Column Density vs. optical HI Isovelocity vs. optical Channel map	Data: Acquired October 25, 2011 Status: reductions in progress
AGC 174605	Block 1: Acquired April 1, 2011 Status: reductions in progress Block 2: Acquired April 23, 2011 Status: reductions in progress	Data: Acquired October 28, 2010 Status: reduced and imaged Previews: HI Column Density vs. optical HI Isovelocity vs. optical Channel map	Data: Acquired October 11, 2011 Status: reductions in progress
AGC 182595	Block 1: Acquired March 7, 2011 Status: calibrated Block 2: Acquired April 23, 2011 Status: reductions in progress	Data: Acquired November 9, 2010 Status: reduced and imaged Previews: HI Column Density vs. optical HI Isovelocity vs. optical Channel map HI Column Density vs. optical (smoothed) HI Isovelocity vs. optical (smoothed) Channel map (smoothed)	Data: Acquired October 22, 2011 Status: reductions in progress
AGC 731457	Block 1: Acquired March 8, 2011 Status: calibrated Block 2: Acquired April 18, 2011 Status: reductions in progress	Data: Acquired November 13, 2010 Status: reduced and imaged Previews: HI Column Density vs. optical HI Isovelocity vs. optical Channel map	Data: Acquired October 10, 2011 Status: reductions in progress
AGC 748778	Block 1: Acquired May 1, 2011 Status: reductions in progress Block 2: Acquired May 7, 2011 Status: reductions in progress	Data: Acquired November 3, 2010 Status: reduced and imaged Previews: HI Column Density vs. optical HI Isovelocity vs. optical Channel map HI Column Density vs. WIYN 3.5m R-band HI Isovelocity vs. WIYN 3.5m Hα	Data: Acquired October 3, 2011 Status: reductions in progress
AGC 749237	Block 1: Acquired April 25, 2011 Status: calibrated Block 2: Acquired April 24, 2011 Status: calibrated	Data: Acquired November 21, 2010 Status: reduced and imaged Previews: HI Column Density vs. optical HI Isovelocity vs. optical Channel map, part 1 Channel map, part 2 Channel map, part 3	Data: Acquired October 16, 2011 Status: reductions in progress
AGC 749241	Block 1: Acquired April 19, 2011 Status: reductions in progress Block 2: Acquired March 22, 2011 Status: reductions in progress	Data: Acquired November 22, 2010 Status: reduced and imaged Previews: HI Column Density vs. optical HI Isovelocity vs. optical Channel map	Data: Acquired September 29, 2011 Status: reductions in progress

Hubble Space Telescope (HST) Imaging
Visit Status Report
Field Visualizations

Galaxy	Status and Preview	Preliminary CMD
AGC 110482
AGC 111164
AGC 111946
AGC 111977	Imaging acquired November 16, 2011	F814W vs. (F606W - F814W) CMD
AGC 112521
AGC 174585	Imaging acquired December 26, 2011
AGC 174605
AGC 182595
AGC 731457
AGC 748778	Imaging acquired December 14, 2011
AGC 749237
AGC 749241

Spitzer Space Telescope Imaging
AORs
Target fields V1
Target fields V2

Galaxy	Spitzer 3.6 micron	Spitzer 4.5 micron
AGC 110482
AGC 111164	IRAC Band 1	IRAC Band 2
AGC 111946	IRAC Band 1	IRAC Band 2
AGC 111977	IRAC Band 1	IRAC Band 2
AGC 112521	IRAC Band 1	IRAC Band 2
AGC 174585
AGC 174605
AGC 182595
AGC 731457
AGC 748778	IRAC Band 1	IRAC Band 2
AGC 749237
AGC 749241

KPNO Spectroscopy
Extending the LZ Relation
Parameter space

KPNO/WIYN Ground-based Imaging
Current 3-color images
Current H Alpha images

GALEX Archival Imaging
~75% of sample has GALEX imaging

Created November 18, 2010, by JMC
Updated December 22, 2011, by JMC