星系形态星表数据描述

Zurich Structure & Morphology Catalog

v1.0 Definitions

COSMOS Overview

The COSMOS Archive serves data taken for the

Cosmic Evolution Survey

(COSMOS) project.

COSMOS

is an astronomical survey designed to probe the

formation

and

evolution

of

galaxies

as

a

function

of

cosmic

time

(redshift)

and large scale structural environment. The survey covers a 2 square

degree equatorial field with imaging by most of the major space-based

telescopes (Hubble, Spitzer, GALEX, XMM, Chandra) and a number of large

ground based telescopes (Subaru, VLA, ESO-VLT, UKIRT, NOAO, CFHT, and

others).

IRSA serves the COSMOS archive using the following search methods:

?

Spatial search on all

images and small catalogs

, using Atlas

?

Advanced search on only the larger

catalogs

, using Gator

Zurich Structure & Morphology Catalog v1.0 Overview

This catalog contains the measurements presented in:

?

1. Scarlata, Carollo, Lilly et al 2007, ApJS, 172, 406 (i.e., the

Zurich

Estimator

of

Structural

Type

[ZEST]

catalog;

measurements

down

to

a

limiting

magnitude

of

I_AB=24.

ZEST

measurements

for

galaxies

with

half-light

radii

<

0

.17

are

unreliable,

especially

for

galaxies

with

a steep light profile)

?

2.

Sargent,

Carollo,

Lilly

et

al

2007,

ApJS,

172,

434

(i.e.,

Single-Sersic GIM2D fits; measurements down to a limiting magnitude

of

I_AB=22.5;formal

GIM2D

fits

are

also

listed

for

approx.

2650

compulsory

zCOSMOS-Bright

x-ray,

radio,

etc.

sources

with

I_AB

>

22.5

-

however,

the

quality

of

the

fits

deteriorates

for

sources

substantially fainter than ~I_AB~23)

This

v1.0

catalog

is

based

on

the

May

2006

release

%

of

Alexie

Leauthaud's

ACS catalog (cut at the limits mentioned above)

Notes:

(a) All ACS_

Leauthaud catalog

(b) The catalog has been cross- correlated with the

January 2006

Capak

catalog.

All

Decs

refer to

this version of

the ground- based

photometric catalog, and provide the closest ground-based match to the

ACS source within a radius of 0.6 arcseconds.

(c)

The

catalog

contains

71

colums

and

131532

lines.

Each

line

is

written

in fortran format:

(d)

An

entry

of

-999999

indicates

measure ment

(including in

the

ACS

and Capak catalogs).

(e) The pixel scale for the quantities in pixels is 0.03

Zurich Structure & Morphology Catalog v1.0 Column Definitions

Gator serves the

Zurich Structure & Morphology Catalog v1.0

(76 columns

[71

delivered

+

5

IRSA- created],

131,532

data

rows).

The

column

descriptions can be found below.

Column Name

SequentialID

RA

DEC

CAPAK_ID

CAPAK_RA

CAPAK_DEC

ACS_MAG_AUTO

Data

Units

Type

int

float

degrees

float

degrees

float

float

degrees

float

degrees

float

Description

Identification number

Right ascension

Declination

ID based on ground-based photometric

catalog of Capak 2006

Closest

matched

right

ascension

to

ground-based catalog within 0.6

Closest

matched

declination

to

ground-based catalog within 0.6

Total

magnitude

of

object-

used

for

catalog selection

X-pixel position on ACS-tile

Y-pixel position on ACS-tile

X-pixel

position

of

object

peak

flux

on

ACS tile

Y-pixel

position

of

object

peak

flux

on

ACS_MAGERR_AUTO float

magnitude

Magnitude error

ACS_X_IMAGE

ACS_Y_IMAGE

float

pixel

float

pixel

ACS_XPEAK_IMAGE float

pixel

ACS_YPEAK_IMAGE float

pixel

ACS tile

ACS_ALPHAPEAK_

float

degrees

ACS_DELTAPEAK_

float

degrees

ACS_A_IMAGE

ACS_B_IMAGE

float

float

RA of object peak flux

Dec of object peak flux

SExtractor semi-major axis

SExtractor semi-minor axis

SExtractor position angle

SExtractor a/b [semi-major

axis / semi

minor axis]

SExtractor stellarity parameter

Unique number that identifies object

1

=

Detection

from

'hot'

pass

of

SExtractor.

0

=

Detection

from

'cold'

pass

of

SExtractor.

Type of object.

1 = galaxy

2 = star

3 = spurious

Object overlap flag. All objects here

have overlap =1 i.e. no overlap.

Object

in

star

mask

flag.

All

the

objects in this morphological catalog

have

=

1

which

means

they

are

not in a star mask.

Object in automatic mask flag.

2 = star used to make automatic mask

Object in manual mask flag.

-1 = manual mask (astrophysical obj)

0

=

manual

mask

(artifact

or

image

defect)

1 = not in manual mask

Object useable flag.

0 = do not use this object

ACS_THETA_IMAGE float

ACS_ELONGATION

float

ACS_CLASS_STAR

float

ACS_IDENT

ACS_SE

float

float

ACS_MU_CLASS

float

ACS_OVERLAP

ACS_NEARSTAR

float

float

ACS_MASK

float

ACS_MASKED

float

ACS_CLEAN

float