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Duilia de Mello. Some results presented are unpublished. If you need to refer to this work contact me. Don’t use it without emailing me before, please, [email protected] Census of the Star-forming. galaxies at intermediate-z. Duilia de Mello (GSFC/JHU)

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slide1

Duilia de Mello

Some results presented are unpublished. If you need to refer

to this work contact me. Don’t use it without emailing

me before, please, [email protected]

Census of the Star-forming

galaxies at intermediate-z

Duilia de Mello (GSFC/JHU)

Jonathan P. Gardner (GSFC)

and the GOODS team

slide2

| | | |

8.8 6 3.3 1.6 Gyr

Duilia de Mello

Cosmic Star formation history

Extinction corrected

LBGs

Steidel et al. 1999

lyman break technique
Lyman Break Technique

UV dropouts – z~2.6-3.4 [UV is detected in the optical]

Steidel et al. 2004, Shapley et al. 2003, Pettini et al. 2000

slide4

LBGs spectra are similar to starbursts at low-z starbursts.

What are their morphologies?

Are they the building blocks

of larger galaxies?

Need a large sample of LBGs!

Deep images with high resolution.

Rest-frame 1000 1200 1450 1925

slide5

Great Observatories Origins Deep Survey

HST

ACS (B, V, i, z)

Multi-epoch

2 fields South

North (CDF-S

HDF-N) –

316 arcmin2

0.03”/pix

Spatial resolution 0.1’’

Giavalisco et al. 2004

slide6

B-dropouts : LBGs at z = 4

Ravindranath et al. (2005; in preparation)

slide7

| | | |

8.8 6 3.3 1.6 Gyr

Duilia de Mello

Cosmic Star formation history

Extinction corrected

LBGs

Steidel et al. 1999

rest frame uv
Rest-frame UV

Finding starbursts at intermediate-z

  • 1500 Å at z~0.5 is observed at 2250 Å
  • 0.8 2700
  • 1.0 3000
  • 1.2 3300
slide9

GOODS - near-UV coverage

WFPC2

1500 Å at z=1

slide10

GOODS - near-UV coverage

  • WFPC2 (F300W) observations of GOODS/HST are shallow but cover large area.
  • WFPC2 (F300W) observations of the Ultra Deep Field (UDF) - Deep but cover small area.
slide13

GOODS shallow U-band

Magnitude_Auto (F300W)

slide14

GOODS DEEP U-band

84 700 s orient 310

238 400 s orient 314

= 323 100 s

GOODS

UDF

278.9 ks

Resolution = 0.06”/pixel

slide15

GOODS DEEP U-band

de Mello, Wadadekar, Casertano, Gardner 2005 (submitted)

slide16

GOODS shallow U band

Photometric Redshifts

slide18

SEDs

Coleman et al. 80, Kinney et al. 96

Scd

E

Sbc

Starburst

Im

Starburst

Templates: early- to late-type Coleman et al.

Starbursts Kinney et al.

Dahlen et al. 2005, Mobasher et al. 2004

slide20

GOODS shallow U band

E Sbc Scd Im Sb1 Sb2

slide21

GOODS shallow U band

E Sbc Scd Im Sb1 Sb2

slide22

Gallery of starbursts

with spectroscopic

redshifts:

Late-types,

Interacting,

Tidal tails,

Compacts,

tadpoles

zphot=0.36 zphot=0.42 zphot=0.57

zphot=1.12 zphot=0.55 zphot=0.69

zphot=0.7 zphot=1.12 zphot=1.31

results goods shallow u band1
Results – GOODS shallow U-band
  • 35% are starbursts (81/227 – 43 stars)
  • 75% of starbursts have tidal tails or peculiarities/interaction
  • 50% of starbursts have another galaxy within 5x5”
  • 36% of starbursts show tadpole morphology
slide24

Blue are starbursts

Circles HDF-N

Triangles CDF-S

Luminous blue

Compact gals

Blue nucleated,

Compact narrow

emission line,

Small blue gals

Bershady etal 00

slide25

Blue are starbursts

Circles HDF-N

Triangles CDF-S

Bluest are mostly Starbursts, #2 is Im

slide26

Bluest

Objects

Compacts

Tidal tails

Tadpoles

But...

slide27

Bluest

Objects

Compacts

Tidal tails

Tadpoles

But...

Are we looking

at the SF

region shape

or overall

Morphology?

slide28

Bluest

Objects

Compacts

Tidal tails

Tadpoles

But...

Are we looking

at the SF

region shape

or overall

Morphology?

Is GOODS good

Enough??

Depth Of ACS

and WFPC2

enough??

slide30

E

  • Sbc
  • Scd
  • Im
  • Starburst 1
  • Starburst 2

Spectral Types

SB2

SB1

E-Sa

slide31

Cyan 0.2<z<0.6

Yellow 0.6<z<0.8

Green 0.8<z<1.0

Magenta 1.0<z<1.2

size

Papovich et al 05

Locals:

Scd/Sdm/Irr

Sab/Sbc

E/S0

Measured on rest-frame B band

slide32

At 0.8<z<1.2 most

  • of objects are:
  • compact, LSB,
  • tadpoles
  • - Have spectral
  • types of starbursts
  • and have small
  • sizes rh~2kpc

LBGs at z~4

<rh>~1.7kpc

Ferguson et

al. 2004 –

measured

at rest-frame UV

1200-2000Å

slide34

Young clusters (Antennae)

Intermediate 0.25-1Gyr

Old Globulars

Age

108 – 1010 yr

New

Starburst99

Vazquez &

Leitherer 05

V-I

Cyan 0.2<z<0.6

Yellow 0.6<z<0.8

Green 0.8<z<1.0

Magenta 1.0<z<1.2

B-V

slide35

Summary

  • UV-selected galaxies at intermediate-z when seen in redder wavelenghts are:
    • spirals, peculiars, compact, tadpoles, lsb, and even early-types !
  • Majority of them have spectral types of starbursts, have neighbors, show signs of interaction. Bluest are compact, tadpole.
  • At 0.8<z<1.2 most of UV-selected objects are compact, LSB, blue dots, tadpole, with small sizes rh~2kpc, and spectral types of starbursts.
  • When compared to clusters and models, most of the UV-selected have mixed ages ranging from 108 to 1010 yr.
  • Next: increase UV sample: GALEX, UDF ACS-UV
slide37

Bluest

Objects

Compacts

Tidal tails

Tadpoles

But...

Are we looking

at the SF

region shape

Or overall

Morphology?

Is GOODS good

Enough??

Depth Of ACS

and WFPC2

problem??

local universe multiwavelength view k correction
Local Universe – multiwavelength view (K-correction)
  • Late-type (Sc and later) are similar in the optical and UV (star-forming regions dominate).
  • Early-type spirals (Sa-Sbc) tend to be classified as later-types in the UV (disk dominates).
  • Ellipticals retain smooth profile, but appear more compact.
slide42

FUV NUV300 I874 H160

FUV NUV300 I874 H160

z

0.09

0.321

0.321

0.475

0.555

0.682

HDF-N

Morphological K-correction (ACS/SBC, WFPC2, NICMOS)

Teplitz et al. 2005 in preparation

slide43

Comparison of Structural Parameters from GOODS and HUDF:

Triangles are LBGs

Blue z=3

Green z=4

Red z=5

Dots are all galaxies

GOODS depth is good

Enough for bright LBGs

Ravindranath et al. (2005; in preparation)

results goods shallow u band2
Results – GOODS shallow U-band
  • 95 objects with spectroscopy
  • Objects of all types (35% Starbursts)
  • 66% of the starbursts have tidal effects and/or close companions, but only
  • 33% of the other types have tidal effects
slide47

Cyan 0.2<z<0.6

Yellow 0.6<z<0.8

Green 0.8<z<1.0

Magenta 1.0<z<1.2

LBGs are more

luminous with

MB ~ -23 ± 1

The brightest objects

slide48

Cyan 0.2<z<0.6

Yellow 0.6<z<0.8

Green 0.8<z<1.0

Magenta 1.0<z<1.2

Locals:

Scd/Sdm/Irr

Sab/Sbc

E/S0

slide49

CAS in the ACS

1134 galaxies identified in the ACS field within

0.24<z<1.3 RAB<24 – Mobasher et al. 2003

65% are late-types (C=2.65, A=0.27)

21% are early-types (C=2.35, A=0.23)

14% are starbursts (C=2.53, A=0.33)

UV selected galaxies are on average more

asymmetric (C=2.63, A=0.35)

AAS Atlanta 2004

slide50

Duilia de Mello

Great Observatories Origins Deep Survey

Chandra=460 arcmin2

slide51

| | | |

8.8 6 3.3 1.6 Gyr

Duilia de Mello

Which objects cause the decline in the SFR density?

Connolly et al. 97

Lilly et al. 96

Fading dwarfs or decline in SF in disks?

Steidel et al. 1999

slide52

Duilia de Mello

GOODS with HST/ACS

Multi-wavelength: B, V, i, z (3700 – 11000 Å)

Multi-epoch: every 45 days (5 epochs)

Area: 316 arcmin2 – two fields

Resolution: 0.03”/pixel – spatial resolution 0”.11

models starburst99 vazquez leitherer 2005

Young clusters

Intermediate

Old Globulars

Models – Starburst99Vazquez & Leitherer 2005

NGC4038/39

Whitmore et al. 99

solar metal.

20% solar

2% solar

slide55

GOODS shallow U band

  • 88% of the two GOODS ACS fields
  • 741 WFPC2 images: 30 GOODS-S, 25 GOODS-N drizzled images.
  • Source Extractor (1.5σ sky threshold – 5 contiguous pixels)
  • Match WFPC2 and ACS catalogs (1.5”): 130 objects in the GOODS-S and 138 in the GOODS-N, total of 268 objects
slide56

U-dropouts : LBGs at z = 3

<----------->

Ravindranath et al. (2005; in preparation)

3"

slide57

V-dropouts : LBGs at z = 5

Ravindranath et al. (2005; in preparation)

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